Answer: OA is a balanced equation.
Explanation: For an equation to be balanced, the number of atoms and the total charge of each element in the reaction, of the product and reactant side must be the same.
Considering OA; 6 atoms of nitrogen is present in the reactant side. Shifting to the product side, 6 atoms of nitrogen is also present. Taking the other element in the reaction into account, the number of atoms of each element balances on both sides.
ANSWER:
The correct answer is OA. 2NH3 (g) + 3Mg (s) →3H2 (g) + Mg3N2 (s)
The Equation; 2NH3 (g) + 3Mg (s) →3H2 (g) + Mg3N2 (s), is a balanced chemical equation.
FURTHER EXPLANATION;
According to the law of conservation of mass, all chemical equations should be written such that the mass of the reactants is equal to the mass of the products.
This is done by balancing the chemical equation.
Balancing of chemical equations is a try and error method that makes sure the number of atoms of each element in a chemical equation are equal on the side of the reactants and that of products.
The equation; 2NH3 (g) + 3Mg (s) →3H2 (g) + Mg3N2 is said to be balanced since the number of atoms of each element are equal on both side of the equation.
That is; 2 atoms of nitrogen, 6 atoms of hydrogen and 3 atoms of magnesium on both side of the equation.
Choice OB is incorrect because, the equation 4NH3 (g) + Mg(s)* - H2(g) + Mg3N2 (s) is not balanced as the number of nitrogen atoms and that of hydrogen atoms are not equal on both side of the equation.(4 nitrogen atoms on the reactant side and 2 nitrogen atoms on the product side, 12 hydrogen atoms on the reactant side and 2 hydrogen atoms on the product side).
Choice OC is incorrect because, the equation, NH3 (g) + Mg (s) - H2 (g) + Mg3N2 (s) is not balanced as the number of nitrogen atoms, magnesium atoms and that of hydrogen atoms are not equal on both side of the equation.(1 nitrogen atom on the reactant side and 2 nitrogen atoms on the product side, 3 hydrogen atoms on the reactant side and 2 hydrogen atoms on the product side, 1 magnesium atom on the reactant side and 3 magnesium atom on the product side).
Choice OD is incorrect because, the equation Ca (s) + 02 (9) - 2Cao (s) is not balanced as the number calcium atoms is not the same on both side of the equation, 1 calcium atom on the reactant side and 2 calcium atoms on the product side.
Match the name of the following compound:
MgSO4 · H2O
Magnesium sulfate monohydrate
Magnesium (II) sulfate monohydrate
Magnesium (II) sulfate hydrate
Magnesium sulfate hydrate
Answer:
number 2 is the answer my friend said
Explanation:
Answer:
Magnesium sulfate monohydrate
Explanation:
The compound is a salt, we have a metal connected to an ion.
To name a salt, first of all, we put the name of the cation, which is the first elemental in the compound. It is followed by the name of the anion.
In this case, the cation is the Magnesium and the anion is the anion sulfate. When the cation can have more than one oxidation number, we need to put this number in parenthesis, like this:
Iron (II) sulfate (FeSO4)
Iron (III) sulfate (Fe2(SO4)3)
However, magnesium can only have 2 as oxidation number, because it's from family 2 in the periodic table. So it's unnecessary to put this information.
As the salt has water in its structure, it's a hydrated salt, and this information needed to be in its name. Because it has only one molecule of water, we put the name monohydrate.
Which type of graph would best to represent a budget?
Answer:
Line or a bar graph
Explanation:
Answer:
I'm pretty sure it's the pie chart
Explanation:
Which statement about enzymes is true
Answer:
whats the statment sis
Explanation:
Having food in the stomach __________ the rate at which a person's BAL rises.
Answer:
Explanation:
It rises Food in your stomach (Food slows down alcohol absorption. What's the best to eat? Protein! It takes the longest to digest)
It will slow down the rate at which a person's BAL rises.
Which of the following hydrocarbons will most likely be found around cows? A. ethane B. methane C. octane D. decane
Answer:B
Explanation:I know for a fact Its BAnswer:
Methane
Choice B is correct
Explanation:
Methane is a key byproduct of the bacterial breakdown in the gut.
Therefore, Methane is most likely to be found around cows
Identify which properties could correspond to solids, plasmas, or both.
maintain a unique shape.
____particles collide infrequently with other particles.
____particles have very high velocities.
____can conduct electricity.
____contain protons.
____typically have a low temperature.
____structure has long-range order.
Explanation:
Plasma is defined as the state of matter which is a hot ionized gas that consists of positively charged ions and negatively charged electrons.
Like gases, particles of a plasma are also held by weak forces that are Vander waal forces. And, as it is a hot ionized gas therefore, particles of plasma move rapidly from one place to another.
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy. Also, molecules in a solid are placed in a long range order.
Solids like copper, silver etc able to conduct electricity.
Also, both plasma and solids contain proton because every atom contains neutrons, protons and electrons.
Thus, we identify the properties corresponding to solids, plasmas, or both are as follows.
Solids maintain a unique shape.Plasma particles collide infrequently with other particles.Plasma particles have very high velocities.Both can conduct electricity.Both contain protons.Solids typically have a low temperature.Solids structure has long-range order.Answer:
Identify which properties could correspond to solids, plasmas, or both.
Solids
maintain a unique shape.
Plasma
particles collide infrequently with other particles.
Plasma
particles have very high velocities.
Both solids and plasmas
can conduct electricity.
Both solids and plasmas
contain protons.
Solids
typically have a low temperature.
Solid
structure has long-range order.
Explanation:
8. What happens to matter during a chemical reaction
Answer: A new substance(product) is made from different elements(reactants) joined by chemical bonds
Explanation: To have a chemical reaction the chemical properties must change. Atoms are never created or destroyed during chemical reaction but at least one chemical bond is broken or formed. Evidence of a chemical change include: change of odor, change of color (for example, silver to reddish-brown when iron rusts), and change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
An acid is a substance that donates protons.
true or false please answer asap!!!
Answer:
The correct answer is True.
Explanation:
An acid is a molecule that has the property of donating a proton or accepting a pair of electrons during a reaction.
The strength of an acid is related to their tendency to lose a proton. A strong acid is one that separates all its components when it comes into contact with water.
As its composition includes hydrogen ions, the more its concentration, the higher the acidity will be, and the lower the pH of the solution.
Its main characteristic is that on contact with water they produce a sour taste.
An acid is a substance that donates protons. Therefore, this given statement is very true.
Acid is any material that when dissolved in water has a sour taste, alters the colour of some indicators (blue litmus paper turns red, for example), combines with some metals (like iron) to release hydrogen, reacts chemically bases to produce salts, and catalyses various chemical reactions. Acids are examples of both organic chemicals that belong to the acid group, carboxylic acid, sulfonic acids, or phenol groups as well as the inorganic substances that comprise the mineral acids, such as sulfuric, nitric, hydrochloric, etc phosphoric acids. An acid is a substance that donates protons. Therefore, this given statement is very true.
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How has the scientific community addressed the safety of chemicals?
A. Chemicals are repeatedly tested, even those that have existed for
a long time.
B. Existing chemicals are tested if they have never been tested
before.
c. Chemicals are tested if they are suspected to have caused a
problem.
D. Only new chemicals are tested.
Answer:
A
Explanation:
Chemicals are repeatedly tested, even those that have existed for
a long time.
Which of the following represents the ester functional group?
A. -COO-
B. -CHO
C. -COOH
D. C=O
Answer:
D. C=O
Explanation:
Esters are formed by the condensation of alcohols and acids with minus water. During the reaction, at least one -OH group is replaced by an O- alkyl group. The resulting compound is an ester and has a characteristic fruity smell. Its functional group is C=O
Answer: A. -COO-
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
A. Esters have functional group [tex]-O=C-OR[/tex].
Example: methyl ethanoate with molecular formula [tex]CH_3COOCH_3[/tex]
B. Aledydes have functional group [tex]-O=CH[/tex].
Example: Ethanal with molecular formula [tex]CH_3CHO[/tex]
C. Acids have functional group [tex]-O=C-OH[/tex].
Example: Ethanoic acid with molecular formula [tex]CH_3COOH[/tex]
D. Ketones have functional group [tex]-C=O[/tex].
Example: Propanone with molecular formula [tex]CH_3COCH_3[/tex]
Calculate number of CO2 molecules in 0.250 mol of co2
This calculation yields 1.506 × 10²³ molecules of CO₂.
Calculating the Number of CO₂ Molecules in 0.250 mol of CO₂
To determine the number of CO₂ molecules in 0.250 mol of CO₂, we can use Avogadro's number, which is the number of particles (atoms, molecules, ions, etc.) in one mole of a substance.
Step-by-Step Explanation:
Avogadro's number is 6.022 × 10²³ molecules/mol.
We are given 0.250 mol of CO₂.
Multiply the number of moles by Avogadro's number to find the number of molecules:
Calculation:
0.250 mol × 6.022 × 10²³ molecules/mol
= 1.506 × 10²³ molecules
Therefore, there are 1.506 × 10²³ molecules of CO₂ in 0.250 mol of CO₂.
hat is the best way to compare a concentrated solution to a dilute solution, given the same volume of solution?
Answer:
Using the molarity of the solution
Explanation:
The concentration of the two solutions can be compared by the use of the number of moles of solute present in each of the solutions. The solution with a higher molarity will be concentrated while the solution with a lower molarity will be dilute.
To compare concentrated and dilute solutions, one looks at the amount of solute in relation to the solvent for the same volume. Calculation of the new concentration after dilution can use the [tex]M_1 \times V_1 = M_2 \times V_2[/tex] equation, applying to stock solutions to reach desired dilutions.
To compare a concentrated solution to a dilute solution while maintaining the same volume, one should examine the ratio of solute to solvent present in the solution. A concentrated solution has a higher concentration of solute, meaning there is a large amount of solute relative to the solvent.
On the other hand, a dilute solution contains a smaller amount of solute hence a lower concentration. This concept can be analogous to the process of making juice from concentrate; you add water to the concentrated juice, thereby increasing the volume while reducing the solute-to-solvent ratio.
When performing calculations, you can use the dilution equation [tex]M_1 \times V_1 = M_2 \times V_2[/tex], where M represents molarity and V represents volume, to determine the new concentration after dilution. For instance, if you have 100 mL of a 2.0 M HCl and dilute it to 500 mL, you can calculate the new molarity ([tex]M_2[/tex]) by applying this equation.
The methodology of dilution typically involves taking a measured volume of a stock solution and adding solvent to reach the desired concentration. This process of diluting adjusts the ratio of solute to solvent, creating a solution of lesser concentration.
11) If 352 moles of butane (CH) is mixed with 8.47 moles of oxygen gas, how many grams of water will be produced?
2C,H,0 + 130, 800, + 10 H,0 (balanced)
Answer:
117 g
Explanation:
We are given the amounts of two reactants, so this is a limiting reactant problem.
1. We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 63.55 32.00 18.02
2C₄H₁₀ + 13O₂ ⟶ 8CO₂ + 10H₂O
n/mol: 352 8.47
2. Calculate the amount of water that each reactant can produce
(a) From C₄H₁₀
Moles of H₂O = 352 mol C₄H₁₀ × (10 mol H₂O/2 mol C₄H₁₀) = 704 mol H₂O
(b) From O₂:
Moles of H₂O = 8.47 mol O₂ × (10 mol H₂O/13 mol O₂) = 6.515 mol H₂O
3. Identify the limiting reactant
The limiting reactant is O₂, because it gives fewer moles of H₂O.
4. Calculate the mass of water
Mass of H₂ = 5.515 mol H₂O × (18.02 g H₂)/(1 mol H₂O) = 117 g H₂O
The reaction produces 117 g H₂O.
Which of the following is a testable hypothesis?
A. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
B. Green toothpaste tastes better than blue toothpaste or red
toothpaste.
C. Smart, careful, healthy people always brush their teeth.
D. It's wrong to not brush your teeth before you have an important
conversation with someone.
Answer:
If I brush my teeth, I will get fewer cavities than if I don't brush my teeth.
Explanation:
apex
The combustion of methane, CH4, releases 890.4
kJ/mol. That is, when one mole of methane is burned,
890.4 kJ are given off to the surroundings. This means
that the products have 890.4 kJ less than the reactants.
Thus, AH for the reaction = - 890.4 kJ. A negative symbol
forAH indicates an exothermic reaction.
CH (g) + 20 (g)> CO2 (g) + 2 H0 (1); AH = - 890.4 kg
a) How much energy is given off when 2.00 mol of CH,
are burned?
b) How much energy is released when 22.4g of CH. are
burned?
Answer:
[tex]\boxed{\text{a) 1.78 MJ; b) 1.25 MJ}}[/tex]
Explanation:
[tex]\rm CH$_4$ + 2O$_2 \longrightarrow \,$ CO$_2$ + 2H$_2$O; \Delta H = - 890.4 \text{ kJ}$\cdot$\text{mol}$^{-1}$[/tex]
a) Energy from 1 mol
[tex]\Delta_{\text{c}}H^{\circ} = \text{2.00 mol} \times \dfrac{\text{-890.4 kJ}}{\text{1 mol}}=\text{-1780 kJ} = \textbf{-1.78 MJ}\\\\\text{The reaction gives off } \boxed{\textbf{1.78 MJ}}[/tex]
b) Energy from 22.4 g
(i) Convert grams to moles
[tex]n = \text{22.4 g } \times \dfrac{\text{1 mol }}{\text{16.04 g}} = \text{1.399 mol}[/tex]
(ii) Convert moles to energy
[tex]\Delta_{\text{c}}H^{\circ} = \text{1.399 mol} \times \dfrac{\text{-890.4 kJ}}{\text{1 mol}}=\text{-1250 kJ} = \textbf{-1.25 MJ}\\\\\text{The reaction releases } \boxed{\textbf{1.25 MJ}}[/tex]
Is so2 a formula unit
Answer:
The molecular formula for Sulfur Dioxide is SO2. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur Dioxide, or 64.0638 grams.
So yes it is a unit
Explanation:
how many moles of oxygen react with 12 moles of aluminum
Answer:
If, for example, we want to know how many moles of oxygen will react with 17.6 mol ... Write the balanced chemical reaction for the combustion of C 5H 12
Explanation:
What is the boiling point in degrees Celsius of water
Answer:
100 degree celsius
Explanation:
what tool did Maurice use when studying dna???
Answer:
He used the X-ray tool
Explanation:
Answer:
a x ray
Explanation: mark me brainliest plzzz
what are the 4 phases of matter in order of increasing engery content?
Answer:
plasma,gas, liquid, solid
Explanation:
Plasmas are hotter than gases and so have more kinetic energy, next is gas, then liquid and finally a solid.
Answer:
the four phrase are plasma, liquid , gas , and solid
Explanation:
Complete the following statements to describe
solids,
liquids, and gases. Select the correct answer from each drop-down menu.
A solid
a definite volume and
a definite shape.
A liquid
a definite volume and
a definite shape.
A gas
a definite volume and
a definite shape
Answer : The correct option is,
A solid : a definite volume and a definite shape.
Explanation :
As we know that there are 3 states of matter :
Solid state : It is defined as a state in which the particles are closely packed and does not have any space between them. This state have a definite shape and volume. For example : iron metal
Liquid state : It is defined as a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state have a definite volume but does not have a fixed shape. For example : water
Gaseous state : It is defined as a state in which the particles are loosely arranged and have a lot of space between them. This state have indefinite volume as well as shape. For example : Any type of gas like, helium gas.
Hence, the correct answer is, a solid has a definite volume and a definite shape.
A circle is centered at the point (5, -4) and passes through the point (-3, 2). The equation of this circle is (x + )2 + (y + )2 = . Reset
Answer:
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
Explanation:
We have been given the center of the circle as (5, -4) and a point on the circumference as (-3, 2). We first determine the radius of the circle. The radius is the distance from the center to any point on the circumference. Using the distance formula, we have;
[tex]radius=\sqrt{(5--3)^{2}+(-4-2)^{2}}\\radius=\sqrt{64+36}=10[/tex]
The radius of the circle is thus 10 units.
The equation of a circle with center (a,b) and radius r units is given as;
[tex](x-a)^{2}+(y-b)^{2}=r^{2}[/tex]
Plugging in the values given we have;
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
what is the primary purpose of a rate law
Answer:
The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters. For many reactions the rate is given by a power law such as.
Explanation:
The other person Goggled it. So, pick me as Brainliest.
The primary purpose of a rate law is to provide a mathematical framework that links the rate of a chemical reaction to the concentration of its reactants.
The primary purpose of a rate law is to provide a mathematical expression that describes the relationship between the rate of a chemical reaction and the concentration of its reactants. Through rate laws, scientists can calculate expected yields, determine optimum conditions for economic chemical processes, and understand the course of individual reactions. The derivation of rate laws is essential as they are not directly obtained from chemical equations for ordinary reactions but rather determined from experimental data involving the measurement of concentrations over time.
To ascertain a rate law, the method of initial rates is commonly employed. This involves conducting experiments under varying reactant concentrations and measuring the reaction rates to deduce the reaction order and rate constant. These parameters are indispensable for formulating a rate law, which in turn allows for the calculation of reaction rates under different conditions and aids in the identification of the reaction mechanism.
Which sentence from Holes contains an implied personality trait?
Stanley and his parents had tried to pretend that he was just going away to camp for a while, just like rich kids do.
He'd just been in the wrong place at the wrong time.
Stanley felt somewhat dazed as the guard unlocked his handcuffs and led him off the bus.
Stanley nodded to show he understood
Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
Although the excerpt from Holes is missing from your question an answer is provided based on the principle of implied personality trait
An implied personality trait is used to describe the character of a person based on his actions and thought. also implied personality trait are used to make inferences about an individual.
As seen in the sentence " Stanley and his parents had tried to pretend that he was just going away like rich kids do " the inference /conclusion contained in this sentence is that Stanley and his parents are pretending
Hence we can conclude that ; Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
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Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II
Answer:
Calcium bromide
Explanation:
When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.
Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.
For the second element, you name it as well, but only use the root name and end it with -ide.
NEED ANSWER ASAP According to Ohm’s law, resistance is equal to voltage divided by
current.
conduction.
potential.
time.
Answer:
A
Explanation:
Ohm's law is stated as E = current * resistance (E = I * R)
When you rearrange the formula, you get R = E/I
The answer is current -- A
Answer:
a
Explanation:
18.A 2.50 L sample of dry air in a cylinder exerts a pressure of
3.00 atm at a temperature of 25 C. The cylinder is reduced to
1.00 atm. What is the volume of the gas without a change in
temperature?
Answer:
[tex]\boxed{\text{7.50 L}}[/tex]
Explanation:
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rclrcl}p_{1}& =& \text{3.00 atm}\qquad & V_{1} &= & \text{2.50 L} \\p_{2}& =& \text{1.00 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}3.00 \times 2.50 & =& 1.00V_{2}\\7.500 & = & 1.00V_{2}\\V_{2} & = &\textbf{7.50 L}\\\end{array}\\\text{The volume of the gas is } \boxed{\textbf{7.50 L}}[/tex]
Using Boyle's law, which states that pressure and volume are inversely related at a constant temperature, we find that the volume of the dry air sample increases to 7.50 L when the pressure is reduced to 1.00 atm.
Explanation:The question you asked involves the property of gases described by Boyle's law. This law states that at a constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if the pressure of a fixed amount of gas is decreased, its volume will increase accordingly, assuming the temperature remains the same.
To find the new volume of the gas, we can use the formula P1V1 = P2V2, where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume we're looking for. We know that P1 = 3.00 atm, V1 = 2.50 L, and P2 = 1.00 atm. Plugging these values into the equation, we get: 3.00 atm * 2.50 L = 1.00 atm * V2. Solving for V2, we find that V2 = 7.50 L. So, the volume of the gas after reducing the pressure to 1.00 atm, without changing the temperature, is 7.50 L.
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Which is the most likely way an automotive engineer would use chemistry
Final answer:
An automotive engineer would most likely use chemistry to design and improve automobile catalytic converters, ensuring efficient combustion and reduced toxic emissions. They also work on reformulating gasoline to meet environmental standards and improve engine performance.
Explanation:
The most likely way an automotive engineer would use chemistry is through the design and development of automobile catalytic converters. Scientists have engineered catalytic converters to significantly reduce the toxic emissions resulting from gasoline burned in internal combustion engines. By implementing a blend of catalytically active metals, these converters facilitate the complete combustion of carbon-containing compounds into carbon dioxide, while also diminishing the output of nitrogen oxides.
Another aspect of chemistry in automotive engineering involves the reformulation of gasoline. Removing substances like tetraethyllead, which hampers exhaust catalysts, and decreasing the presence of highly volatile and unsaturated hydrocarbons are critical to reduce photochemical smog and increase engine efficiency.
A substance added in The final stages to remove sulphur from coal is
A substance used to remove Sulphur from coal is a desulfurizing agent, commonly a limestone slurry. It chemically reacts with the Sulphur emissions, creating less harmful substances like Gypsum.
Explanation:A substance used in the final stages to remove Sulphur from coal is called a desulfurizing agent or a scrubber. One technique includes the use of a limestone slurry, which reacts chemically with the sulphur emissions and converts them into less harmful substances, such as gypsum. Gypsum, or calcium sulfate, is a beneficial byproduct because it can be used in the manufacture of wallboard and other building materials. Thus, the process not only removes pollutants like sulfur from the coal but also creates a valuable byproduct.
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How will the rate at which a solid solute dissolves change if the solution is stirred?
The rate at which the solute dissolves will stay the same.
The rate at which the solute dissolves will increase.
The rate at which the solute dissolves will decrease.
The rate at which the solute dissolves will fluctuate.
Answer:
The rate at which the solute dissolves will increase.
Explanation:
If a solution is stirred, the rate at which a solute dissolves would increase substantially provided the solution is not yet saturated.
Stiring would cause more of the solution to come in contact with every part of the solute. It will increase the surface area of contact for the solution to act which will shoot up the rate of reaction. Stiring helps to bring solutes in solutions into a more close contact with the molecules or compounds of the medium.