CHEMISTRY HIGH SCHOOL

For an experiment, you place 15 g of ice with a temperature of -10 C into a cup and labela. You also place 25 g of ice at the same temperature into another cup and label it
b. Which of the following statements is true?
A) The average kinetic energy of the ice in cup A is less than that in cup
b.
B)The average kinetic energy of the ice in cup A is greater than that cup in
b.
C)The average kinetic energy of the ice cup A is equal to that in cup
b.
D)The average kinetic energies of the ice in cup A and the ice in cup B are not comparable.

Answers

Answer 1
Answer:

Average kinetic energy is given by the formula:

KE(average) = 3/2*k*T

where k = Boltzmann constant = 1.38*10⁻²³ J/K

T = temperature in Kelvin (K)

Thus, the average KE is dependent only on temperature and independent of mass.

Since the temp in Cup A and B remains the same, the average KE will also be the same.

Ans C)
Answer 2
Answer: The correct answer is c. Temperature is the average kinetic energy of a sample so if two samples have the same temperature they will also have the same average kinetic energy. I hope this helps. Let me know if anything is unclear.

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How many protons, neutrons, and electrons does uranium-235 have

Answers

Uranium-235 is composed of 92 protons, 143 neutrons, and 92 electrons.

What are electrons?

An electron is a negatively charged subatomic particle.

Uranium-235 is a naturally occurring isotope of uranium, an element characterized by having 92 protons in its nucleus.

As all uranium nuclei have 92 protons, the nucleus of a uranium-235 atom will also have 143 neutrons to give it a total atomic mass number of 235.

Thus, Uranium-235 is composed of 92 protons, 143 neutrons, and 92 electrons.

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Answer:

Uranium is element 92, so unionized, it has 92 protons and electrons. U-235 is an isotope with a total of 235 nucleons, so subtract 92 to get 143 neutrons.

Explanation:

potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons. What best describes the bromide ion that forms? It is a negative ion that has one less valence electron than a neutral bromine atom. It is a positive ion that has one less valence electron than a neutral bromine atom. It is a negative ion that has one more valence electron than a neutral bromine atom. It is a positive ion that has one more valence electron than a neutral bromine atom.

Answers

Answer: It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation:

Answer:

C. or It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation:

I got a 100 on my quiz on edge2020

1. What kind of diagram shows how energy flows from one organism to another?a. producer c. consumer
b. ecology d. food chain

Answers

It would be D.the food chain

Which substance does not obey the Lewis octet rule?(a) N₂
(b) NO
(c) CF₄
(d) Ar

Can anyone explain this?

Answers

I can tell you that the first five elements of the periodic table does not obey the octet rule. The only reason for that is because they are trying to be like their closest noble gas which will be helium in this case.

What is the percentage of nitrogen in N2O

Answers

The percentage of nitrogen in nitrous oxide or N₂O  is 63.64% and percent of oxygen is 36.36 %.

What is percent composition ?

It is the percent of each element which exists in a compound. It is calculated in three methods:

1) percent w/w

2) percent v/v

3) percent w/v

Percent w/w is the percent composition wherein both the components are solids.Percent v/v is percent composition wherein the 2 substances are liquid and percent w/v is percent composition where one substance is solid and one is in liquid form.

The percent composition of all substances is equal to 100%.The percent composition of nitrogen in nitrous oxide is calculated as follows:

molar mass of nitrous oxide=44 g

molar mass of nitrogen =14 g

As nitrous oxide has 2 nitrogen ,therefore 14×2=28

To find percent composition,

molar mass of nitrogen in nitrous oxide/molar mass of nitrous oxide×100

∴28/44×100=63.64%

Thus, percent of nitrogen in N₂O is 63.64%.

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Answer:

63.64% Nitrogen

36.36 Oxygen

A person makes a 400 dollar deposit in a bank account in January. By December, the value of that deposit willA. be three hundred dollars.
B. actually double.
C. remain the same, plus interest.
D. be two hundred dollars.

Answers

The amount in his bank account should grow because he will have accumulated some interest, even if the $400 stays the same, so this would be c.

The answer choice is B) It should actually double.


Considering it's been in the bank so long, it would have increased because of interest rates.
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