Answer:
The hot tea should transfer 25.63 kJ the surroundings to cool the tea.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat has to be transferred from the tea to the surroundings to cool the tea (Q = ??? J).
m is the mass of the hot tea (m = dV = (1.0 g/mL)(250 mL) = 250 g), suppose the density of water is the density of tea.
c is the specific heat of the hot tea (c = 4.10 J/°C.g).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 350 K - 375 K = -25°C).
∴ Q = m.c.ΔT = (250 g)(4.10 J/°C.g)(-25°C)) = - 25630 J = - 25.63 kJ.
So, the hot tea should transfer 25.63 kJ the surroundings to cool the tea.
Which of the following might a biologist choose to study?
A. The pigments used in Claude Monet's paint
B. Wind patterns on Mars
C. The effects of ultraviolet light on red paint
D. The causes of honeybee deaths in beehives
Answer:
D
Explanation:
All the others are unrelated to biology as biology is the study of life (hence bio) and not chemistry or anything else.
A biologist might study the causes of honeybee deaths in beehives, as it falls within the biological study of organisms, their ecosystems, and their interaction with the environment. Ecologists, as biologists, may study predator-prey dynamics and the role of biodiversity and ecological succession in species survival.
Explanation:A biologist might choose to study the causes of honeybee deaths in beehives. This topic falls under the field of biology as it involves examining the biological factors, ecosystems, and environmental impacts on a species. Biology encompasses the study of living organisms, their interactions within ecosystems, and factors affecting their survival. For instance, a biologist studying honeybee mortality may investigate patterns in bee behavior, health, genetic factors, or the influence of pesticides and other anthropogenic factors on populations.
A specific example of a biologist's work could be an ecologist studying the patterns on the wings of an endangered butterfly species to understand how these patterns help the species escape predators like birds. Researchers in such fields collect data, observe, and analyze patterns to draw conclusions about biological processes and biodiversity. Additionally, factors such as ecological succession and biogeography are critical in such studies.
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When sugar is burned, water vapor and carbon dioxide are produced.
A sugar molecule has a specific number of carbon, hydrogen, and oxygen atoms. Use the balanced chemical equation to identify the number of carbon, hydrogen, and oxygen atoms in sugar.
sugar + 12O2 → 11H2O + 12CO2
Sugar has carbon atoms.
Sugar has hydrogen atoms.
Sugar has oxygen atom
Answer:
12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Explanation:
Using a balanced chemical equation we can identify the number of carbon, hydrogen, and oxygen atoms in sugar.
CxHyOn + 12O₂ → 11 H₂O + 12CO₂
when an equation is completely balanced, then the number of each atom of an element is equal on the reactant side and the product side.
Therefore;
For carbon; x = 12
For Hydrogen; y = (11×2) = 22
For Oxygen; n + (12×2) = 11 + (12×2)
= n + 24 = 11 + 24
n = 11
Therefore the sugar has, 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Thus the balanced equation would be;
C₁₂H₂₂O₁₁ + 12O₂ → 11 H₂O + 12CO₂
Answer:
12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Explanation:
Convert the following temperatures from K to °C.
100 K = °C
273 K = °C
6 K = °C
143°C = K
573°C = K
-173.15
-0.15
-267.15
416.15
846.15
assuming k is kelvins and c is celsius
1. -173.15°c
2. -0.15°c
3. -267.15°c
4. 416.15k
5. 846.15k
when a sample of a gas is cooled it condenses into a liquid. in which of the following ways do the molecules of the original gas sample compare with the molecules of a liquid.
Answer:
The molecules have shorter inter molecular distances and less kinetic energy than the original gas sample.
The cooling reduces the kinetic energy of the gas sample and thus the molecules making up the liquid sample travel less distances due to the less energy. The less inter molecular distances increases the attraction due to inter molecular forces packing the molecules near each other, forming a liquid.
Which Type of thermal energy uses electromagnetic waves to transfer energy
Answer:
The correct answer is radiation thermal energy.
Explanation:
The transfer of energy in thermal energy comprises the transfer of internal energy. The three kinds of thermal energy transfer are convection, conduction, and radiation. In convection, the movement of warm particles takes place, in conduction the direct contact of atoms occurs, and in radiation, the transfer of energy takes place in the form of electromagnetic waves.
The energy produced by a nuclear reaction comes from:
In the nuclear fusion reaction energy is produced due to remaining mass of the nuclei and in nuclear fission it is released due to breaking of bonds of the nucleus.
What are nuclear reactions?Nuclear reactions are those reactions in which nuclei of two atoms are involved in the reaction.
These are of two types:
Nuclear fission: In this reaction one nuclei will break into two small nuclei and in this process energy is emitted due to breaking of particle into small particles of low mass.Nuclear fusion: In this reaction two nuclei will combine to form one atom of lower mass, and energy is released due to left mass of substance.Hence, energy is produces by the change in mass and breaking of bonds in the nuclear reactions.
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What color is produced when red light is added to green light?
-Hello There-
When red Light Is Added To Green Light You Get Yellow Light.Have A Great Day!
When red light is added to green light you get yellow
Select the correct answer from each drop-down menu.
What is the chemical name of this compound?
Na2S:
Answer:
Sodium Sulphide.
Explanation:
The chemical name is sodium sulphide. The valency of the sulphide ion is 2 while the valency of sodium is 1 . That is why the molecule contains 2 sodium ions.
Answer: sodium sulphide.
Explanation:
[tex]Na_2S[/tex] is an ionic compound because sodium element is a metal and sulphur element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
Hence, the name of [tex]Na_2S[/tex] is sodium sulphide.
Therefore, the correct answer is sodium sulphide.
Which of the following solutions will have the lowest freezing point?
a. 1 molar KCl solution
b. 1 molar FeCl3 solution
c. 1 molar CaCl2 solution
d. 1 molar NaCl solution
The answer to this question would be b.
3 things affect the freezing point of water, a constant(Kf), molality(b) and a number of dissolved particles (i).
Kf is a constant so that has the same effect. Because you have 1 mole of everything, molality is also constant.
so the only thing you gotta look after is the number of the dissolved particles which which iron III chloride has the highest
Final answer:
The 1 molar FeCl3 solution will have the lowest freezing point because, upon dissociation, it produces the most particles per kilogram of water, which causes the greatest freezing point depression. So the correct option is b.
Explanation:
The solution with the lowest freezing point is determined by the number of particles produced in the solution upon dissolving the solute. The effect on the freezing point is a colligative property, meaning it depends on the number of solute particles in the solution, not the type of particles. To answer which of the following solutions will have the lowest freezing point — 1 molar KCl, 1 molar FeCl3, 1 molar CaCl2, or 1 molar NaCl — we must consider the dissociation of each compound.
KCl, NaCl, and CaCl2 are all salts that dissociate into ions in solution. KCl and NaCl dissociate into two ions (K+ and Cl- for KCl, Na+, and Cl- for NaCl), so a 1 molar solution of these salts will produce 2 moles of ions per kilogram of water. CaCl2 dissociates into three ions (Ca2+, Cl-, Cl-), resulting in 3 moles of ions per kilogram of water. FeCl3, however, dissociates into four ions (Fe3+, Cl-, Cl-, Cl-), which gives us 4 moles of ions per kilogram of water.
Thus, the solution of 1 molar FeCl3 will have the lowest freezing point because it produces the highest number of dissociated particles, leading to the greatest degree of freezing point depression.
The potential energy diagram shows the gain and loss of potential energy as water molecules decompose into hydrogen and oxygen. Label the parts of the diagram.
products
reactants
activated
complex
activation
energy
enthalpy of
reaction
chemical potential energy
progress of reaction
Answer:
Kindly find the attached image.
Explanation:
Activation energy: is the difference in potential energy between the activated complex and reactants.
Enthalpy of reaction: is the difference in potential energy between the products and reactants.
Answer : The energy diagram is shown below.
Explanation :
Activated complex : When the reactant molecules absorb energy then their bonds are loosened and new lose bonds are formed between them.
The intermediate formed is known as activated complex and it is an unstable state and immediately dissociates to form the stable products.
Activation energy : It is defined as the minimum amount of energy absorbed by the reactant molecules so that their energy becomes equal to the threshold energy. Or we can say that, the difference between the reactant and the activated complex.
Enthalpy of reaction : It is defined as the energy change that takes place when the reactants go to the products. It is represented as, [tex]\Delta H[/tex]. Or we can say that, the difference between the product energy and the reactant energy.
Hence, the energy diagram is shown below.
Sodium-24 has a half life how much sodium-24 will remain in an 18 g sample after 75 hours
Answer:
[tex]\boxed{\text{0.56 g}}[/tex]
Explanation:
The half-life of Na-24 (15 h) is the time it takes for half of it to decay.
After one half-life, half (50 %) of the original amount will remain.
After a second half-life, half of that amount (25 %) will remain, and so on.
We can construct a table as follows:
No. of Fraction Mass
half-lives t/da Remaining Remaining/g
0 0 1 18
1 15 ½ 9.0
2 30 ¼ 4.5
3 45 ⅛ 2.2
4 60 ⅟₁₆ 1.1
5 75 ⅟₃₂ 0.56
6 90 ⅟₆₄ 0.28
We see that [tex]\boxed{\textbf{0.56 g}}[/tex] remain after five half-lives (75 h).
The half-life of Sodium-24 is 15 hours. Using this information, you can determine that approximately 0.5625g of the initial 18g of Sodium-24 will remain after 75 hours.
In order to determine the amount of Sodium-24 remaining after 75 hours, we first need to know the half-life of Sodium-24, which is approximately 15 hours. The term 'half-life' refers to the period of time it takes for half of the initial amount of a radioactive substance to decay.
After one half-life (15 hours), half of the 18g of Sodium-24 would remain, which is 9g. After the second half-life (30 hours), half of the 9g would remain, which is 4.5g. After the third half-life (45 hours), half of 4.5g would remain, which is 2.25g. After the fourth half-life (60 hours), half of 2.25g would remain, which is about 1.125g. Finally, after the fifth half-life (75 hours), half of 1.125g would remain, which is approximately 0.5625g. Thus, after 75 hours, 0.5625g of the initial 18g of Sodium-24 would remain.
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calculate the pressure in atm occupied by this gas at 42.5 liters,65c,1.52 moles
Answer:
0.9925 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm (P = ??? atm).
V is the volume of the gas in L (V = 42.5 L).
n is the no. of moles of the gas in mol (n = 1.52 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 65°C + 273 = 338.0 K).
∴ P = nRT/V = (1.52 mol)(0.0821 L.atm/mol.K)(338.0 K)/(42.5 L) = 0.9925 atm.
charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the abosolute temperature. this law explains what
Answer:
it explains the relationship between temperature and volume
Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.
What is Charles law?Charles' law is just a gas statement that governs how gases increase while heated in an experimental setting. The Kelvin temperature and volume should be in direct proportion whenever the pressure on such a test of dry gas was maintained constant, according to a modern version of Charles's law.
What is volume?
A scalar quantity that expresses the proportion of three-dimensional area contained by a sealed surface will be called volume.
Therefore, Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.
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123.4 grams of iron to moles of iron
Answer:
2.209687527979228
Explanation:
Hope this help!
what is Newton's 1st Law of Motion
The law of inertia. Basically, every object stays in the same spot unless they are moved by an external force, .
An object at rest will remain at rest or an object in motion will remain in motion unless acted upon an unbalanced force
4Al + 3O2 → 2Al2O3
In this chemical reaction, how many grams of Al2O3 will be produced if 375 grams of Al react completely? Express your answer to three significant figures.
Ans: 187.5 grams of Al2O3
Final answer:
To calculate the mass of [tex]Al_2O_3[/tex] produced from 375 grams of Al, we find the moles of Al, use the stoichiometry of the reaction to find the moles of [tex]Al_2O_3[/tex], and then convert to grams. The result is 708.6 grams of [tex]Al_2O_3[/tex].
Explanation:
Given the balanced chemical reaction [tex]4Al + 3O_2 \rightarrow 2Al_2O_3[/tex], we first need to calculate the number of moles of aluminum (Al) that's present in 375 grams. Using the molar mass of aluminum (26.98 g/mol), we can determine this:
Calculate moles of Al: [tex]375 g Al \times \frac{1 mol Al}{26.98 g Al}[/tex] = 13.9 moles of Al (rounded to three significant figures).According to the balanced reaction, 4 moles of Al will produce 2 moles of [tex]Al_2O_3[/tex]. Therefore, 13.9 moles of Al will produce [tex]\frac{13.9 moles Al}{4 moles Al} \times 2 moles Al_2O_3[/tex] = 6.95 moles of [tex]Al_2O_3[/tex].Finally, convert moles of [tex]Al_2O_3[/tex] to grams using its molar mass (101.96 g/mol): 6.95 moles [tex]Al_2O_3[/tex] x 101.96 g/mol = 708.6 grams of [tex]Al_2O_3[/tex] (rounded to three significant figures).Hence, if 375 grams of Al react completely, a total of 708.6 grams of [tex]Al_2O_3[/tex] will be produced.
How many moles are present in 10.5 grams of NaCl?
0.180 mol
0.18 mol
0.457 mol
N(number of moles)=mass/molar mass
10.5=mass
Na=23 (rounded)
Cl=36 (rounded)
Add it together to get the molar mass
=59
Then refer back to the formula
10.5/59
=0.17796
Round that answer
=0.18 mol
Answer : The correct option is, 0.180 mole
Explanation : Given,
Mass of NaCl = 10.5 g
Molar mass of NaCl = 58.5 g/mole
Formula used :
[tex]\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}[/tex]
Now put all the given values in this formula, we get the moles of NaCl.
[tex]\text{Moles of NaCl}=\frac{10.5g}{58.5g/mole}[/tex]
[tex]\text{Moles of NaCl}=0.179mole=0.180mole[/tex]
Therefore, the number of moles of NaCl is, 0.180 mole
Which of these time measurements is the smallest?
0.02 seconds
0.02 teraseconds
2,500 milliseconds
25,000 nanoseconds
Answer:
In order to answer the question, we convert the measurements given to a common base unit. For this case, we use seconds.
A) 0.02 seconds
B) 0.02 teraseconds x (10^12 s / 1 terasecond) = 2x10^10 seconds
C) 2,500 milliseconds x (1 s / 1000 ms) = 2.5 seconds
D) 25,000 nanoseconds x (1 x 10^-9 s / 1 nanosecond) = 2.5 x 10^-5 seconds
So ,The correct answer is option " D "
What causes the Brownian motion of particles in a colloid?
a) collisions between the particles and surrounding molecules
b)interactions with rays of light that shine through the colloid
c )the force of gravity, which pulls the particles downward
d) electrical attractions between the particles and surrounding molecules
Answer:
The correct answer option is a) collisions between the particles and surrounding molecules.
Explanation:
The collisions between the particles and surrounding molecules causes the Brownian motion of particles in a colloid.
Brownian motion is the irregular movement of the microscopic particles in a fluid which bombard into each other.
It basically is the result of the molecules of a dispersion medium colliding with the dispersed particles of the phase.
Helppppp What released through nuclear fusion in stars
Energy
Gas
Mass
Pressure
Energy is released when this happens
I believe it is Energy, I am not sure. Sorry if it is wrong.
Which of those is a balanced chemical equation? (super important)
I believe C is the balanced equation.
C is the answer i think
An Alcohol and an organic acid are combined to form water and a compound with a pleasant odor. This reaction is an example of what?
Answer:
This reaction is an example of forming ester "Esterification".
Explanation:
This reaction is an example of forming ester "Esterification".In which an alcohol and an organic acid are reacted to produce ester (which gives fruit like pleasant odor).The most commonly ester is ethyl-ethanoate:Ethanol + acetic acid → ethyl-ethanoate + water.
C₂H₅OH + CH₃COOH → CH₃COOC₂H₅ + H₂O.
What is the significance of the meltdown at Chernobyl ?
Answer:
Chernobyl Accident 1986. The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind – some 5200 PBq (I-131 eq).
Explanation:
The Chernobyl disaster was a catastrophic nuclear accident in 1986, causing immediate deaths and long-term health issues due to radiation. The region remains largely uninhabitable due to persistent contamination.
Significance of the Chernobyl Meltdown:
The Chernobyl disaster, which occurred on April 26, 1986, was a catastrophic nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine. During an unauthorized safety test, reactor no. 4 exploded due to an uncontrollable chain reaction, causing immense steam pressure that ruptured the reactor and released radioactive material.
The aftermath saw 50 tonnes of radioactive material released into the environment, leading to the evacuation of approximately 30,000 people.
Immediate effects included the deaths of 32 plant workers and firefighters who succumbed to acute radiation sickness. Long-term consequences predict around 4000 additional deaths from radiation-induced illnesses like cancer among emergency workers and former residents.
The region around Chernobyl remains highly contaminated and largely uninhabitable, demonstrating the devastating and lasting impact of nuclear accidents on both human populations and the environment.
The Chernobyl disaster has highlighted the risks associated with nuclear energy, influenced global nuclear policy and safety standards, and left a stark reminder of the potential outcomes of nuclear energy mismanagement.
Parts of a_____ can often be separated by______ properties.
Answer: compound, chemical
Explanation:
In an investigation that uses the scientific method, which step immediately follows asking a question?
O presenting the results
O making observations
O creating a hypothesis
O designing an experiment
Answer:
creating a hypothesis.
Explanation:
you need to have a hypothesis to then start designing the exp.
Answer:
its c)creating a hypothesis.
Explanation:
just took quiz
What causes geologic events such as earthquakes, volcanic eruptions, and the creation of mountains? A. position of the planets B. atmospheric pressure C. ocean tides D. lithospheric plate movement
I am pretty sure the answer is D. Lithospheric plate movement. :)
D, because without plate movement, there would be no earthquakes or other geologic events.
how is a balanced chemical equation similiar to a recipe
A balanced chemical equation is analogous to a recipe because it outlines precise quantities of reactants needed to produce specific products, reflecting the concept of stoichiometry used in cooking. Adjusting ingredient amounts when changing recipe size is similar to calculating reactant and product amounts in chemical reactions, demonstrating the conservation of mass.
A balanced chemical equation is similar to a recipe in that both provide the exact proportions of ingredients or reactants needed to produce a desired outcome, be it a chemical product or a food dish. When you follow a recipe, you are essentially performing stoichiometry, which is the precise measurement and calculation of reactants and products in a chemical reaction. Just as doubling or halving a recipe requires adjusting the amount of each ingredient accordingly, the same concept applies to chemical reactions when predicting the amounts of products produced or reactants required.
For instance, just like a recipe that makes 1 dozen biscuits requires specific quantities of flour, eggs, shortening, salt, baking soda, and milk, a chemical equation needs to balance the atoms of each element on both the reactant and product sides of the equation. This reflects the conservation of mass, as the quantity of each element remains constant throughout the reaction. The balanced equation thus communicates not only the substances involved but also their amounts in a concise and quantitative manner. By understanding the concepts used in cooking, one can grasp the principles of stoichiometry and balanced equations in chemistry.
What type of reaction is a neutralization reaction?
Which is a a characteristic of a strong acid ?
Answer:
It completely dissociates in water.
Explanation:
The characteristic of a strong acid is that it completely dissociates when dissolved in water to form ions.
What are acids?
Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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Upon combustion, a compound containing only carbon and hydrogen produces 2.49 g CO2 and 0.763 g H2O . Find the empirical formula of the compound
Answer:
CH2.
Explanation:
The mass of C in the CO2 = 2.49 * 12/(12+32) = 0.6791 g
The mass of Hydrogen in the water = 2 * 1.008 / (2.016 + 16) = 0.1119 g.
Ratio of H to O is 0.1119/ 1.008 : 0.6791/12
= 0.111 : 0.0566
= 2 : 1
The empirical formula is CH2