potential energy with the heat given to the food
Final answer:
Microwave ovens cook food by increasing the rotational energy of water molecules within the food.
Explanation:
Microwave ovens can cook food because they increase the rotational energy of water molecules in the food. Microwaves emit electromagnetic radiation, typically at a frequency of around 2.45 GHz, which is absorbed by the dipole water molecules found in food. As these water molecules absorb the microwaves, they rotate more rapidly, this increase in rotational motion then is transformed into heat through the interactions with surrounding molecules, thus cooking the food.
When microwaves interact with water molecules, this interaction causes an increase in the vibrational and rotational energies due to the water's dipolar nature, with the rotational aspect being most significant in microwave cooking. It is this rotational kinetic energy that is transformed into thermal energy, which heats and cooks the food. This energy transfer from microwaves to rotational motion, and subsequently to heat, is efficient as the frequency of microwaves in the oven is specifically tuned to the resonant frequency for water molecule rotation.
Select the correct answer. What is the percent composition of silicon in silicon carbide (SiC)? A. 28% B. 50% C. 70% D. 142%
Answer:
C. 70%
Explanation:
Atomic Mass of the silicon = 28 g.
Atomic mass of the Carbon = 12 g.
Total mass of the Silicon Carbide = 28 + 12
= 40 g.
Now, Using the formula.
% Composition = Mass of the silicon/Total mass of the compound × 100 %
= 28/40 × 100 %
= 70 %
Hence, % composition of the silicon in SiC is 70%
Hydrogen gas and oxygen gas react to form liquid hydrogen peroxide. Which statement is true about the reaction? A. The same atoms are present, so the chemical properties remain the same. B. The atoms of the reactants combine to form a new substance. C. The two gases mix together, but a new substance does not form. D. The product that is formed has the same physical properties as the reactants.
Final answer:
The correct answer to the question is B. The atoms of the reactants combine to form a new substance, and in the case of hydrogen and oxygen gases, they react to form liquid hydrogen peroxide with different chemical properties.
Explanation:
When hydrogen gas and oxygen gas react to form liquid hydrogen peroxide, the atoms of the reactants combine to form a new substance. This is because a chemical reaction involves the rearrangement of atoms to produce new substances with different chemical properties.
The correct statement about this reaction is: B. The atoms of the reactants combine to form a new substance. In a chemical reaction such as this, the physical and chemical properties of the products are typically different from those of the reactants.
An example of a simple chemical reaction is the decomposition of hydrogen peroxide into water and oxygen.
This reaction can be represented by the balanced equation 2H₂O₂ (hydrogen peroxide) → 2H₂O (water) + O₂ (oxygen), showing that hydrogen peroxide and water are compounds composed of more than one type of element, while molecular oxygen is a homonuclear molecule but not a compound
Gina is driving her car down the street. She has a teddy bear sitting on the back seat. A dog runs in front of Gina's car, so she quickly applies the brakes. The force of the brakes causes the car to stop, but the teddy bear continues to move forward until it hits the car's dashboard. The teddy bear did not stop at the same time as the car because A. objects in motion tend to stay in motion unless acted upon by an outside force. B. only objects touching the Earth's surface can be acted upon by an outside force. C. more force is required to stop softer objects than to stop harder objects. D. objects in motion can only be stopped by the application of a balanced force.
object in motion tends to be in motion unless acted upon by an external force
Answer:
The answer is A) objects in motion tend to stay in motion unless acted upon by an outside force
Explanation:
Newton's laws of motion are three laws that describe the relationship between forces acting on an object and the motion of that object. Newton's first law of motion states that an object that is at rest or in uniform motion tends to stay at rest or in uniform motion, respectively, until acted upon by an outside force.
NO2 and N2O4 undergo the reaction shown. When a sealed
container of NO2 reaches chemical equilibrium, which must be true?
A) No N2O4 is present.
B) No chemical reactions are occurring.
C) The rates of the forward and reverse reactions are equal.
D) The maximum number of molecules has been reached.
Answer:
Option C) The rates of the forward and reverse reactions are equal.Explanation:
NO₂ and N₂O₄ undergo the following equilibrium reaction:
2NO₂(g) ⇄ N₂O₄(g)That is a reversible reaction, i.e. there are two simultaneous reactions: the direct or forward reaction and the reverse reaction:
Direct reaction: 2NO₂(g) → N₂O₄(g) Reverse reaction: 2NO₂(g) ← N₂O₄(g)At the beginning, only NO₂(g) is in the sealed container. The NO₂ concentration is maximum, and the rate of the forward reaction is maximum.
As the reaction progresses, the concentration of NO₂ diminishes, and, consequently, the rate of the forward reaction decreases.
As soon as the N₂O₄ appears, the reverse reaction starts. At the beginning the rate is low, but as the N₂O₄ concentration increases the rate of the reverse reaction increases.
When both forward and reverse rates become equal the equilibrium has been reached. This is what is called a dynamical equilibrium.
Then, as per the choices, you have that, at equilibrium:
A) No N₂O₄ is present:
False: as explained above, at equilibrium both NO₂ and N₂O₄ are present.B) No chemical reactions are occurring.
False: as explained above, at equilibrium both forward and reverse reaction are occurring at the same rate.C) The rates of the forward and reverse reactions are equal.
True: as explained, this is the meaning of dynamic equilibrium.D) The maximum number of molecules has been reached.
False: the number of molecules of each compound at equilibrium will be given by the constant of equiibrium, Keq = [N₂O₄] / [NO₂]², and this value varies with the temperature.What does it mean to discuss the concentration of a solution
When you are discussing the concentration of solution, you are discussing how many particles there are in a given amount of solvent. You are comparing. If there is more solute in a beaker of solvent, then it is highly concentrated. If there is less solute in a beaker of the same amount of solvent, then it is less concentrated or more dilute. The terms diluted and concentrated are related to each other. These words are used to compare certain solutions to each other, since there is nothing like numbers, these words are relative to one another.
Final answer:
Discussing the concentration of a solution means specifying the exact amount of solute dissolved in a given amount of solvent. It can be expressed as a mass percentage, ppm, or ppb, and is important for understanding solution strength and stoichiometry in chemical reactions.
Explanation:
To discuss the concentration of a solution means to specify the amount of solute that is dissolved in a given volume or mass of solvent. Descriptive words like dilute or concentrated provide a general idea but actual measurements of concentration give precise meaning. For instance, a solution with a high concentration has a large amount of solute relative to the solvent. Conversely, a solution with a low concentration has a smaller amount of solute. People familiar with making instant coffee or lemonade inherently understand this concept; too much powder results in a strong flavor, whereas too little leaves the solution weak and watery.
Concentration can be quantified in several ways, such as mass percentage, parts per million (ppm), and parts per billion (ppb). A common method is by stating the ratio of the mass of the solute to the total mass of the solution. This is vital in chemistry, especially for controlling reactions and understanding the stoichiometry of reactants in solutions.
If an aqueous solution of a soluble ionic com- pound is made, it will usually
1. become a ductile solid.
2. become covalent.
3. form an insoluble solid.
4. conduct current.
A soluble ionic compound in aqueous form will be able to 4. conduct current
An aqueous ionic compound is able to conduct current because:
They possess charged ions They are able to move aroundAs a result of being able to move around in a solution, the ions of aqueous compound will be able to carry electricity from one point to another and so will be able to conduct electricity.
In conclusion, aqueous solutions of ionic compounds can conduct current.
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Answer:
4. conduct current
PLEASE HELP!
Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).
Match Term Definition
1.) Decreasing the pressure A) Shift to the left
2.) Adding hydrogen gas B) Shift to the right
3.) Adding a catalyst C) No effect
May someone help me match these definitions?
Answer:
1) Increasing the pressure A) Shift to the left
2) Removing hydrogen gas B) Shift to the right
3) Adding a catalyst C) No effect
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.1) Decreasing the pressure:
When there is an increase in pressure, the equilibrium will shift towards the side with fewer moles of gas of the reaction. And when there is a decrease in pressure, the equilibrium will shift towards the side with more moles of gas of the reaction.The reactants side (left) has 4.0 moles of gases and the products side (right) has 2.0 moles of gases.So, decreasing the pressure will shift the reaction to the side with more moles of gas (left side).so, the right match is: A) Shift to the left.
2) Adding hydrogen gas:
Adding hydrogen gas will increase the concentration of the reactants side, so the reaction will be shifted to the right side to suppress the increase in the concentration of hydrogen gas by addition.so, the right match is: B) Shift to the right.
3) Adding a catalyst:
Catalyst increases the rate of the reaction without affecting the equilibrium position.Catalyst increases the rate via lowering the activation energy of the reaction.This can occur via passing the reaction in alternative pathway (changing the mechanism).The activation energy is the difference in potential energies between the reactants and transition state (for the forward reaction) and it is the difference in potential energies between the products and transition state (for the reverse reaction).in the presence of a catalyst, the activation energy is lowered by lowering the energy of the transition state, which is the rate-determining step, catalysts reduce the required energy of activation to allow a reaction to proceed and, in the case of a reversible reaction, reach equilibrium more rapidly.with adding a catalyst, both the forward and reverse reaction rates will speed up equally, which allowing the system to reach equilibrium faster.so, the right match is: B) No effect.
When a constraint is imposed on a reaction system in equilibrium, the equilibrium position will change in order to annull the constraint.
What is equilibrium?A reaction is said to have attained dynamic equilibrium when the rate of forward reaction is equal to the rate of reverse reaction. We know that when a constraint is imposed on a reaction system in equilibrium, the equilibrium position will change in order to annull the constraint.
Now the effect of the factors stated on the equilibrium position is matched below;
Increasing the pressure ------ > Shift to the right
Removing hydrogen gas -------> Shift to the left
Adding a catalyst ----------> No effect
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A piece of fossilized wood has a carbon-14 radioactivity that is 1/4 that of new wood. the half-life of carbon-14 is 5730 years. how old is the cloth?
Answer:
1.146 x 10⁴ year.
Explanation:
The decay of carbon-14 is a first order reaction.The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.The integration law of a first order reaction is:kt = ln [A₀]/[A]
k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.
t is the time = ??? years.
[A₀] is the initial percentage of carbon-14 = 100.0 %.
[A] is the remaining percentage of carbon-14 = 1/4[A₀] = 25.0 %.
∵ kt = ln [Ao]/[A]
∴ (1.21 x 10⁻⁴ year⁻¹)(t) = ln (100.0%)/[25.0 %]
(1.21 x 10⁻⁴ year⁻¹)(t) = 1.386.
∴ t = 1.386/ (1.21 x 10⁻⁴ year⁻¹) = 1.146 x 10⁴ year.
The piece of fossilized wood is approximately 11,460 years old, based on its carbon-14 radioactivity being 1/4 that of new wood and using the known half-life of carbon-14 which is 5730 years.
A fossilized piece of wood has a carbon-14 radioactivity that is 1/4 that of new wood. Given that the half-life of carbon-14 is 5730 years, we can estimate the age of the fossil. For each half-life that passes, the amount of carbon-14 halves. If the wood has 1/4 the radioactivity, this means that two half-lives have passed, as (1/2)² = 1/4. Therefore, using the formula for carbon dating and the known half-life of carbon-14, we can calculate that the wood is approximately 2 times 5730 years old, which is 11,460 years old.
How does the magnitude of the electrical force between a pair of charged objects change when the objects are moved twice as far apart?
Answer:
The magnitude of the force decreases by a factor 4
Explanation:
The magnitude of the electrical force between a pair of charged objects is given by
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1, q2 are the charges of the two objects
r is the distance between the two objects
In this problem, the two objects are moved twice as far apart, so their distance becomes
r' = 2r
Substituting into the equation, we find the new force
[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(2r)^2}=\frac{1}{4}(k\frac{q_1 q_2}{r^2})=\frac{1}{4}F[/tex]
The electrical force between two charged particles decreases when the distance between these particles is increased. If the distance is doubled, the force becomes a quarter of the original due to the inverse square law of Coulomb's Law.
Explanation:The magnitude of the electrical force between two charged objects is governed by Coulomb's Law which states the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Increasing the distance between the objects would cause a corresponding decrease in force. Specifically, if the distance between the pair of charged objects is doubled, the force will be reduced to one-fourth (1/4) of what it was initially as the relationship is based on an inverse square law.
In simpler words, if you double the distance, the force becomes weaker and reduces to a quarter of its original value.
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Which of the following is a force? A. mass B. volume C. weight D. length
I believe it’s C......
it should be c <3 lol hahahahaahaa
Gaseous hydrogen and oxygen can be prepared in the laboratory from the decomposition of gaseous water. The equation for the reaction is2H2O(g) --> 2H2(g)+O2(g)Calculate how many grams of O2(g) can be produced from 42.6 grams of H2O(g).
Answer:
75.5 g O₂ (g) can be produced from 42.6 g of H₂O (g)Explanation:
1) Balanced chemical equation (given):
2H₂O(g) → 2H₂(g) + O₂(g)2) Mole ratios:
2 moles H₂O(g) : 2 moles H₂(g) : 2 moles O₂(g)3) Calculate the number of moles of reactant (H₂0):
number of moles = mass in grams / molar massmolar mass of water: 18.015 g/molmass in grams of water: 42.6 gnumber of moles = 42.6 g / 18.05 g/mol = 2.36 moles H₂O4) Set a proportion using the mole ratio O₂ to H₂O and the actual number of moles of H₂O:
2 moles O₂ / 2 moles H₂O = x / 2.36 moles H₂Ox = 2.36 moles O₂5) Convert 2.36 moles O₂ to grams:
mass in grams = number of moles × molar massmass = 2.36 moles × 32.00 g/mol = 75.5 g O₂Answer:
37.87 g of oxygen can be produced from the 42.6 grams of H2O
Explanation:
From the question, the following equation shows the decomposition of gaseous water
2H₂O(g) ⇒ 2H₂(g) + O₂(g)
where atomic mass of hydrogen is 1 g/mol and atomic mass of oxygen is 16 g/mol
The molar mass of 2H₂O is;
2[(2 ×1) + (16 × 1)]
2(2+16) = 36 g
The molar mass of O₂ is;
2 × 16 = 32 g
Hence, it can be deduced that 36 g of water produced 32 g of oxygen, hence 42.6g of water will produce how many grams of oxygen (represented as X)
∴ 36 ⇒ 32
42.6 ⇒ X
X = 42.6 × 32/36
X = 37.87 g
Which process has been largely responsible for increasing the amount of co2 in the last 200 years? increasing cattle ranching worldwide burning of fossil fuels?
Answer:
worldwide burning of fossil fuels
Explanation:
The heavy usage of the fossil fuels as energy sources for the industry has resulted in much increased emissions of CO2 in the atmosphere. It all started around 200 years ago with the Industrial Revolution. In order for the machines to function, efficient energy sources were needed, and the best thing at that time for that was the coal. Through the burning, the coal manages to release enormous amounts of CO2 into the atmosphere. After some time, the oil was discovered as well, and it started to be heavily used as well, further increasing the CO2 emissions. As the technology has been developing more and more, the demand for the usage of the fossil fuels has been increasing constantly, so there's an ever growing CO2 emissions into the atmosphere.
This is easy, just read the last question. (Already Asked this question before)
How many grams of Sodium Hydroxide could be produced if 1.2L of 3.0 M Calcium Hydroxide are consumed?
Na2CO3 + Ca(OH)2 --> 2NaOH + CaCO3
Now I know how to do equations like this, just a bit confused on how to use my conversion factors.
Do I need to use the 3.0 Molarity in this equation or can I just use Molar Volume of a gas (22.4L/1 mole)?
You would have to use the molarity of calcium hydroxide to find the moles of calcium hydroxide. Once you have moles, just convert using mole:mole ratio and find the grams of sodium hydroxide.
On a protein molecule, side chains of amino acids affect
only the primary structure
primary and secondary structures
secondary and tertiary structures
tertiary and quaternary structures
The correct answer is "On a protein molecule, side chains of amino acids affect only the primary structure." If this is correct and was helpful could you mark me as brainlist? Thanks!
The amino acids side chain forms the basis for the conformation of peptide and affects the primary and secondary structure. Thus, option B is correct.
What are proteins?Proteins are the biomolecules composed of the amino acid chain bond with the peptide bond. The amino acids are composed of amino and carboxyl terminal, with a side chain determining the polarity.
The side chain forms the hydrogen bond and other type of bond in the peptide chain, and thereby governs the primary and the secondary structure of the protein. Thus, option B is correct.
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a mixture of oxygen, nitrogen and hydrogen gases exerts a total pressure of 85 kpa at 0 degrees Celsius .The partial pressure of the oxygen is 20 kpa and the partial pressure of the nitrogen is 50 kpa .What is the partial pressure of the hydrogen gas in this mixtures ?
Answer:
15 kPa.
Explanation:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas:Ptotal = P1 + P2 + … + Pn.
∴ Ptotal = P of oxygen + P of nitrogen + P of hydrogen.
∴ P of hydrogen = P total - (P of oxygen + P of nitrogen) = 85 kPa - (20 kPa + 50 kPa) = 15 kPa.
Excess oxygen gas (O2) reacts with 244g of Iron (Fe) to produce 332 g of Fe2O3. What is the percent yield?
Answer:
95.15%
Explanation:
To calculate the percent yield, we need the following formula:
[tex]\% yield=\dfrac{actual yield}{theoreticalyield}\times100\%[/tex]
Solving for the theoretical yied, you need to predict how much of the product will be produced if we USE up the given.
Our given is 224g of Fe and we to get the theoretical yield, we need to figure out how much product will Fe produce supposing that we use up all the reactant.
First thing we do is get the balance equation of this chemical reaction:
4Fe + 3O₂ → 2Fe₂O₃
We get the ratio between Fe and the the product, Fe₂O₃
[tex]\dfrac{4moles of Fe}{2molesofFe_{2}O_{3}}=\dfrac{2moles of Fe}{1moleofFe_{2}O_{3}}[/tex]
This basically means that we need 2 moles of Fe to produce 1 mole of Fe₂O₃. We'll use this later.
Now we let's use our given:
We need to first convert our given to moles. To do this, we need to determine how many grams there are of the reactant for every mole. We need to first get the atomic mass of the elements involved in the substance:
Iron(1)
Fe = 55.845(1) = 55.845g/mole(1)
Then we use this to convert grams to moles
[tex]244g\times\dfrac{1mole}{55.845g}=4.369moles[/tex]
This means that there are 4.396moles of Fe in 244g of Fe.
This we will use to see how many moles of product we can produce given the moles of reactant by using the reactant:rproduct ratio.
[tex]4.369moles of Fe\times\dfrac{1moleofFe_{2}O_{3}}{2molesofFe}=2.185 moles of Fe_{2}O_{3}[/tex]
So given 4.693 moles of Fe we can produce 2.185 moles of Fe₂O₃
The next step is to get how many grams of product there are given our calculation. We do this again by getting how many grams of Fe₂O₃ there are in 1 mole.
Fe(2) O(3)
Fe₂O₃=55.845(2) + 15.999(3)
= 111.69 + 47.997 =159.687g/mol
We then use this to solve for how many grams of product there are in 2.185 moles.
[tex]2.185moles\times\dfrac{159.687g}{1mole}=348.92g[/tex]
This is our theoretical yield 348.92g of Fe₂O₃.
We can finally use our percent yield equation. Our actual yield is given by the probelm, 332g of Fe₂O₃ and we solved for our theoretical yield which is 348.92g of Fe₂O₃. We plug this in our formula and solve.
[tex]\%yield=\dfrac{actual yield}{theoreticalyield}\times100\%[/tex]
[tex]\%yield=\dfrac{332gofFe_{2}O_{3}}{348gofFe_{2}O_{3}}\times100\%=95.15\%[/tex]
So the answer is 95.15%
Linda performed the following trials in an experiment.
Trial 1: Heat 30.0 grams of water at 0 °C to a final temperature of 40.0 °C.
Trial 2: Heat 40.0 grams of water at 30.0 °C to a final temperature of 40.0 °C.
Which statement is true about the experiments?
The heat absorbed in Trial 1 is about 1,674 J greater than the heat absorbed in Trial 2.
The heat absorbed in Trial 1 is about 3,347 J greater than the heat absorbed in Trial 2.
The same amount of heat is absorbed in both the experiments because the heat absorbed depends only on the final temperature.
The same amount of heat is absorbed in both the experiments because the product of mass, specific heat capacity, and change in temperature are the same.
The heat absorbed in Trial 1 is about 3344 Joules greater than the heat absorbed in Trial 2.
Explanation:The heat absorbed in an experiment is calculated using the formula Q = mcΔT, where 'Q' is the heat absorbed, 'm' is the mass of the substance, 'c' is the specific heat capacity of the substance, and 'ΔT' is the change in temperature. Here, the specific heat capacity of water 'c' is approximately 4.18 J/(g*C).
In Trial 1, we have: ΔT = 40.0 - 0 = 40°, and with mass 30.0 g, the heat absorbed (Q1) = mcΔT = 30.0g * 4.18 J/(g*C) * 40°C = 5016 J.
In Trial 2, we have: ΔT = 40.0 - 30.0 = 10°, and with mass 40.0 g, the heat absorbed (Q2) = mcΔT = 40.0g * 4.18 J/(g*C) * 10°C = 1672 J.
Therefore, the heat absorbed in Trial 1 is about 5016 - 1672 = 3344 J greater than the heat absorbed in Trial 2.
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An inflatable toy starts with 1.05 moles of air and a volume of 5.17 liters. When fully inflated, the volume is 8.00 liters. If the pressure and temperature inside the toy don’t change, how many moles of air does the toy now contain? A. 2.05 mol B. 1.62 mol C. 1.55 mol D. 0.679 mol
Answer:
1.625 mol.
Explanation:
To calculate the no. of moles of a gas, we can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant.
T is the temperature of the gas in K.
If P and T is constant, and have two different values of (n and V):n₂V₁ = n₁V₂
n₁ = 1.05 mole, V₁ = 5.17 L.
n₂ = ??? mole, V₂ = 8.0 L.
∴ n₂ = n₁V₂/n₂ = (1.05 mole)(8.0 L)/(5.17 L) = 1.625 mol.
The toy now contains 1.62 mol
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How many amperes would be needed to produce 60.0 grams of magnesium during the electrolysis of molten mgcl 2 in 2.00 hours?
Answer:
[tex]\boxed{\text{66.2 A}}[/tex]
Explanation:
1. Write the equation for the reaction.
M_r: 24.30
MgCl₂ ⟶ Mg + Cl₂
m/g: 60.0
2. Calculate the moles of Mg
Moles of Mg = 60.0 g Mg × (1 mol Mg/ 24.30 g Mg) = 2.469 mol Mg
3. Calculate the moles of electrons
Moles of electrons = 2.469 mol Mg × (2 mol electrons/1 mol Mg)
= 4.938 mol electrons
4. Calculate the number of coulombs
Q = 4.938 mol electrons × (96 485 C/1 mol electrons) = 476 500 C
5. Calculate the current required
Q = It
I = Q/t
t = 2.00 h × (60 min/1h) × (60 s/1 min) = 7200 s
I = 476 500 C/7600 s= 66.2 C/s = 66.2 A
You need a current of [tex]\boxed{\textbf{66.2 A}}[/tex].
The photo on the right shows 12 solutions with cabbage indicator added. Answer these questions based on your cabbage indicator chart and the colors shown. In which order are the solutions arranged, from left to right? How many acids are shown? How many bases are shown?
a) acid-neutral-base
How many acids are shown? 4
How many bases are shown? 7
What range seems to be missing? 5-6
A cabbage indicator will turn red in an acid solution, purple in a neutral solution, and green to yellow in basic solutions. To find out how many acids or bases are shown in a photo, count the number of solutions that have turned red (for acids) or green to yellow (for bases).
Explanation:Unfortunately, without the specific photo referenced in the question, it's impossible to provide an exact order of the solutions. However, I can explain how to determine if a solution is an acid or base using a cabbage indicator. When a cabbage indicator is added to different solutions, it changes colors based on the pH level of the solution. In acidic solutions, the cabbage indicator turns red, while it turns green to yellow in basic solutions. The neutral solution will have a purple color.
To find out how many acids or bases are shown in the photo, you would count how many of the solutions turn red (for acids) or green to yellow (for bases).
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Write the balanced chemical equation for the following reaction. Phases are optional. Solid calcium chlorate decomposes to form solid calcium chloride and oxygen gas.
Answer:
Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)Explanation:
1) Word equation (given)
calcium chlorate (solid) → solid calcium chloride (solid) + oxygen (gas)2) Chemical formulae of the reactant and products:
Calcium chlorate:The most common oxidation states of chlorine are -1, +1, +3, +5, +7.
The suffix ate in chlorate means that chlorine atom is with the third lowest oxidation state (counting only the positive states). So, this is +5.
The oxidation state of calcium is +2.
Hence, the chemical formula of calcium chlorate is Ca(ClO₃)₂
Calcium chlorideThe suffix ide in chloride means that chlorine is with oxidation state -1. Again the oxidation state of calcium is +2.
Hence, the chemical formula of calcium chloride is CaCl₂
OxygenOxygen gas is a diatomic molecule, so its chemical formula is O₂.
PhasesThe symbols s and g (in parenthesis) indicate the solid and gas phases respectively.
3) Chemical equation:
Ca(ClO₃)₂ (s) → CaCl₂ (s) + O₂ (g)That equation is not balanced becasue the number of O atoms in the reactant side and in the product side are different.
4) Balanced chemical equation:
Add a 3 as coefficient in front of O₂(g), in the product side to balance:
Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)Verify that all the atoms are balanced:
Atom Reactant side Product side
Ca 1 1
Cl 2 2
O 3×2 = 6 2×3 = 6
Conclusion: the equation is balanced and the final answer is:
Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)The decomposition of solid calcium chlorate into solid calcium chloride and oxygen gas is represented by the balanced chemical equation 2Ca(ClO3)2(s) → 2CaCl2(s) + 3O2(g).
Explanation:The balanced chemical equation for the decomposition of solid calcium chlorate to form solid calcium chloride and oxygen gas is:
2Ca(ClO3)2(s) → 2CaCl2(s) + 3O2(g)
This reaction involves the breakdown of calcium chlorate, a chlorate compound, into calcium chloride, a chloride compound, and the release of oxygen gas. This type of reaction is known as a decomposition reaction, where a single compound breaks down to form two or more simpler substances.
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A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution? Useful formulas include , , , and . 1.58 10–12 M 6.31 10–3 M 2.20 M 158 M
Answer:
The concentration of OH- ions = 6.31*10⁻³M
Explanation:
Given:
pH of ammonia solution = 11.8
Formula:
[tex]pH + pOH = 14\\\\pOH = 14-pH = 14 - 11.8 = 2.2\\\\pOH = -log[OH-]\\[/tex]
[tex][OH-] = 10^{-pOH } = 10^{-2.2} = 6.31*10^{-3} M[/tex]
The concentration of OH- ions in a solution with a pH of 11.8 is 6.31 times 10⁻³ M. The calculation involves finding the pOH and then the antilog of the negative pOH.
The pH of a solution is a measure of its acidity or basicity. For a solution with a pH of 11.8, we can find the concentration of hydroxide ions (OH-) by first calculating the pOH, which is 14.00 (at 25°C) minus the pH value. Therefore, the pOH is 14.00 - 11.8 = 2.2. The concentration of OH- is then found by taking the antilog (base 10) of the negative pOH: [OH-] =[tex]10^{ -pOH }[/tex]= 10⁻²°².
To calculate this, we get 10⁻²°² = 6.31 times 10⁻³ M, meaning the concentration of OH- in the solution is 6.31 times 10⁻³M.
The transfer of energy as heat caused by the collision of molecules is called
Answer:
The transfer of energy as heat caused by the collision of molecules is called conduction.Explanation:
The transfer of energy as heat, i.e. heat transfer, is the transfer of kinetic energy due to difference in temperatures of the bodies: heat is transferred from warmer objects to cooler obects.
This heat transfer may occur by three different means:
conduction,convection, andradiation.Conduction is the transfer of heat between objects in direct contact and is due to the transfer of kinetic energy among neighbour particles (atoms or molecules) which are in constant vibration and colliding one to each other. The hotter particles are vibrating faster than the cooler ones, and, so, during the collisions the faster particles trasfer kinetic energy to the quiter particles.
For example, when you heat the tip of a needle the heat will be transfered from the tip to the rest of the needle by conduction.
Convection is the transfer of heat by the motion of fluids (gases or liquids), again the hotter particles, which have greater kinetic energy, transfer their energy to the cooler particles, but in this case the fluid moves.
Radiation is the heat transfer by electromagnetic waves; again from hotter objects to cooler ones. Since electromagnetic waves travel through vacumm, radiation does not need a physical medium.
Conduction is the process by which energy is transferred as heat through the direct contact of molecules, facilitated by atomic or molecular collisions due to differing temperatures. This transfer of heat can change the temperature, affecting things from everyday life to global weather, demonstrating the essential role of conduction in understanding our world.
Explanation:The process of energy being transferred as heat through the collision of molecules is called conduction. Conduction is a fundamental concept in physics and it involves the direct transmission of heat through a substance due to a difference in temperature. It is facilitated by atomic or molecular collisions and it occurs when there is a connection or contact surface between high temperature and low temperature regions.
For example in Figure 1.21 it illustrates how molecules, each having different kinetic energies resulting from their respective temperatures, collide and transfer energy. A molecule in the lower-temperature region gains energy after the collision while a molecule in the higher-temperature region loses energy.
This transfer of heat might change the temperature and is a central concept in thermodynamics playing a critical role in everything from everyday cooking to industrial processes. Therefore understanding conduction is essential to understanding the world around us, from weather patterns on Earth to the life cycle of stars.
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Chemical hazards are defined as: A. Parasites in food B. Poisonous substances that occur naturally or are accidentally added during food handling C. Germs or pathogens entering food D. Foreign objects falling into food
Answer:
B. Poisonous substances that occur naturally or are accidentally added during food handling.
Explanation:
A chemical hazard is defined as the harmful substance that causes loss or harm to the society or community at large and it can be man-made or naturally induced. Such as the hazard which is found of the food can lead to food poisoning or unnatural death. If consumed accidentally or by naturally occurring or added by the process of food handling can cause the loss of digestive power and may lead to food benign prey to the foreign substances that are toxic or untreated.Chemical hazards are poisonous substances that occur naturally or are accidentally added during food handling. They can cause foodborne illnesses and include toxins produced by bacteria or fungi, pesticides, heavy metals, and other harmful chemicals.
Chemical hazards are defined as poisonous substances that occur naturally or are accidentally added during food handling. These hazards can include toxins produced by bacteria or fungi, pesticides, heavy metals, and other harmful chemicals. When these substances contaminate food and are ingested, they can cause foodborne illnesses. For example, aflatoxins are toxic and carcinogenic compounds released by fungi that can contaminate nuts and grains.
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Entropy decreases when select one:
a. pressure decreases.
b. temperature decreases.
c. the system is agitated.
d. temperature increases.
It is B. What I found is when water freezes it's entropy decrease. If water freezing that means the temperature is decreasing and that is B.
What is pH?
A. How basic a solution is
B. The concentration of potassium ions in solution
C. How acidic a solution is
D. The concentration ions in a solution
Final answer:
pH is a measure of how acidic or basic a solution is, based on the hydrogen ion concentration. The pH scale ranges from 0 to 14, where values below 7 are acidic and above 7 are basic. It is calculated as the negative logarithm of the hydrogen ion concentration.
Explanation:
Understanding pH
What is pH? pH is a measure that indicates the acidity or basicity (alkalinity) of a solution. It is a scaled value ranging from 0 to 14 where:
A pH of 7 is considered neutral; neither acidic nor basic.
Values below 7 indicate an acidic solution with a higher concentration of hydrogen ions (H+).
Values above 7 indicate a basic solution with a lower concentration of hydrogen ions.
The pH is calculated as the negative, base-10 logarithm of the hydrogen ion concentration in the solution. A lower pH number means a higher concentration of hydrogen ions and therefore a more acidic solution. Conversely, a higher pH means a lower concentration of hydrogen ions and a more basic solution. The pH scale is a concise way to represent the hydrogen ion concentration, which varies markedly among different solutions and affects their properties.
A pesticide is used to kill crops in a field. A scientist wants to learn how the pesticide is affecting the plants and animals near the field. Which procedure would be most useful? measuring the radioactivity of a sample of untreated pesticide introducing a radioactive tracer to common compounds in the soil subjecting the pesticide to neutron activation analysis introducing a radioactive tracer into a sample of pesticide
Answer:
introducing a radioactive tracer into a sample of pesticide
Explanation:
introducing a radioactive tracer into a sample of pesticide
_____?or current flow, can be thought of as a faucet being turned on and water flowing.
a. Circuit flow
b. Electrical resistance
c. Voltage
d. Amperage
Final answer:
Amperage or current flow, can be thought of as a faucet being turned on and water flowing. Option d
Explanation:
The correct answer to the student's question is d. Amperage. The analogy of a faucet turning on and water flowing is used to describe electric current. Electric current can indeed be thought of similarly to water flowing through a pipe for its easy visualization. When we talk about the flow of charge in a circuit, we use the term amperage to quantify it.
The SI unit for electric current, or amperage, is the ampere, which is defined as one coulomb of charge passing through a point in one second (1A = 1C/s).
This means that electric current, or amperage, is the rate at which the electrical charge is flowing. In electric circuits, this is akin to water moving through a piping system, where the current is the same at all points in the circuit, including inside any batteries or resistors.
This flow of charge is crucial for the functioning of electrical appliances and is measured and regulated for safety and efficiency using devices like fuses and circuit breakers which are rated in amperes. Option d
What would the molecule CH₄ be classified as?
Alkane
Inorganic compound
Alkene
Alkyne
Answer:
Alkane
Explanation:
Definition of Alkane "any of the series of saturated hydrocarbons including methane, ethane, propane, and higher members. (google dictionary)"
CH4 is methane.
what is the name of this compound? see attached.
a) phenylhyde
b) benzaldehyde
c) phenol aldehyde
d) cyclohexylhyde
The answer is B.) benzaldehyde sorry if I’m wrong
Answer: Option (b) is the correct answer.
Explanation:
In the given structure a benzene molecule, that is, [tex]C_{6}H_{5}[/tex] is attached. And, further an aldehyde group that is, CHO group is attached to the benzene molecule.
Hence, suffix "aldehyde" will be added to the name of this molecule.
Whereas a group with formula [tex]C_{6}H_{5}OH[/tex] is known as phenol.
Therefore, we can conclude that the name of this given compound is benzaldehyde.