In which sample do molecules have the greatest average kinetic energy? A.) He at 100 K. B.) H2 at 200 K. C.) O2 at 300 K. D.) H2O at 400 K.

Answers

Answer 1

Answer:

Answer: D.) $H_2O$ at 400 K.

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion.

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

$K=(3RT)/(2)$

K= kinetic energy

R= gas constant

T= temperature in Kelvin

From above, it is visible that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more.

Thus $H_2O$ at 400 K will have greatest average kinetic energy.

Answer 2

Answer: D.) H2O at 400 K, it doesn't really matter what the compound is, but only its temperature. Temperature is the average kinetic energy of the sample that we take, so the highest temperature indicates the greatest average kinetic energy.

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The amount of energy a person can consume throughout the day without gaining weight is extremely dependent onA. hunger.
B. appetite.
C. culture.
D. activity level.

Answers

I'm quite sure it's activity level. One other thing that could've been said is metabolism, but that isn't there. However, food is consumed for the body to have energy, and without that energy we wouldn't be able to function. And when we let that intake of food settle, it's stored as fat. But because of activity level, we are capable of burning those calories.

D is the answer you are looking for.

Baking a cake is an example of -a. forming mixtures.
b. forming solutions.
c. exothermic reactions.
d. endothermic reactions.

Answers

I think the correct answer is D. Baking a cake is an example of endothermic reaction. The chemical changes happening when you bake a cake includes denaturing proteins in milk, eggs, and flour. Chemical bonds are broken and new bonds are made. To aid these changes, heat is supplied by the heat in an oven.

Explain fajan's rule

Answers

Fajans' Rules are used to predict whether a chemical bond will be covalent or ionic.
This depends on:
- the charge on the cation
- the size of the cation
- the size of the anion

Which value from his calculation most strongly affects the number of significant figures in the answer?

Answers

well, the value that would most affect it is the one with the least sig figs

that would be the one that had the least precise way of measurement

Which polyatomic ion has a charge of 3-?

Answers

Most of the common inorganic polyatomic ions have negative charges. This means the ion has more electrons than the neutral atoms that are in the ion. A polyatomic ion like phosphate, PO43- has three extra electrons beyond the electrons on the P and O atoms. Got this off google sorry if it doesn't help you :(

Which region of the visible light spectrum bends the most when passed through a diffraction grating?Red
Yellow
Green
Blue

Answers

Answer:

Red

Explanation:

Red is diffracted the most due to its long wavelength. Compared to violet which is the shortest and is diffracted the least.

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Name the solutes that raises the boiling point of water the most.