Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed 100.0-milliliter container?(1) NH3(s) (3) NH3(g)(2) NH3(ℓ) (4)NH3(aq)

Answers

Answer 1

Answer:

Final answer:

The NH3 sample that will fill and take the shape of a 100.0-milliliter container is NH3(g). Gases such as NH3(g) expand to fill their container, as explained by the ideal gas law and Avogadro's law.

Explanation:

To answer your question about NH3, we need to consider each of the states of matter. Hence, the answer is (3) NH3(g). This is because of the properties that gases have, including the ability to fully expand and take the shape of their container regardless of the volume of the container.

Specifically, any gaseous substance, such as NH3(g), expands to fill its container due to the kinetic energy of the gas molecules and their relatively far-apart spacing compared to solids and liquids. Even a small amount of gas can completely fill even a relatively large container. This phenomenon is due to one of the main gas laws, the ideal gas law, and the properties of gases as stipulated by Avogadro's law that equal volumes of gaseous N₂, H₂, and NH3, at the same temperature and pressure, contain the same number of molecules.

This concept is fundamental in the stoichiometry of gaseous substances and Dalton's law of partial pressures, which states that the total pressure exerted by a mixture of gases is equal to the sum of the pressures that each would exert if it were present alone and occupied the same volume.

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Is this a good scientific question? “Is the lifespan of snowshoe hares, which are white in the winter and brown in the summer, affected by levels of winter snowfall?” A) Yes, because the question is specific. B) No, because the question cannot be tested in a laboratory. C) Yes, because the question has already been answered. D) No, because the question does not lead to a hypothesis.

Answers

The answer is: A) Yes, because the question is specific.

The scientific method is a process for experimentation that is used to explore observations (in this example color of snowshoe hares).

Steps of the scientific method:

1) ask a question about something that is observed.

2) do background research.

3) construct a hypothesis, an attempt to answer questions with an explanation that can be tested.

4) test of hypothesis.

5) analyze collected data and draw a conclusion.

The two main variables in an experiment are the independent and dependent variable.

Dependent variable is the variable being tested and measured in a scientific experiment, in this example lifespan of snowshoe hares.

Dependent variables depend on the values of independent variables. The dependent variables represent the output or outcome whose variation is being studied.

A) Yes, because the question is specific.

Catalysts affect the chemical reactions that take place within the body. What function do catalysts perform in chemical reactions?a. Catalysts slow down the rate of chemical reactions.
b. Catalysts are always formed by chemical reactions.
c. Catalysts are used up during a chemical reaction.
d. Catalysts lower the activation energy of a chemical reaction

Answers

I think the best answer for this is D. Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction.

A student gains 1.0 lb in two weeks. How many grams did he gain?Express your answer to two significant figures and include the appropriate units.

I don’t know

Answers

In 1 lb there are 450 grams (Rounded upto 2 - Significant figures).

We havea weight gain of 1.0 lb.

We have to convert it into grams.

How many grams are there in 1 lb?

I lb = 453.592 grams

According to the question -

A = 1 lb

Converting it into grams, we get -

1 lb = 1 x 453,592 = 453.592 grams

Rounding up to 2 - Significant figures, we get -

1 lb = 450 grams

Hence, in 1 lb there are 450 grams (Rounded upto 2 - Significant figures).

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1lb= 453.592g but then to change to 2 significant figures you go down two of the numbers so here it will be 4 and 5 that stands for 450g. So he gained 450g. I hope that helped

Which highly reactive gas was probably absent from the Earth's primitive atmosphere? O2 (oxygen gas) water vapor methane carbon dioxide

Answers

The highly reactive gas that was probably absent from the Earth's primitive atmosphere is oxygen.

The atmosphere refers to the thin layer of gas above the earth's crust. This thin layer of gases is composed of a mixture of gases. The earth's primitive form also had an atmosphere.

However, we must recall that in its primitive form the earth was mostly under reducing conditions and there was no oxygen. However, photosynthesis by plants increased the oxygen content of the earth.

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Oxygen gas was most likely absent from Earth's primitive atmosphere. The current theory is that the Earth's early atmosphere was composed of mainly carbon dioxide and methane due to the high volcanic activity. Cyanobacteria and their use of photosynthesis was what caused earth's atmosphere to become oxygen enriched.
I hope that helps.

Write the balanced chemical equation for the addition of 2 Br2 to CH3C≡CH.

Answers

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Most reactions between an acid and a base form a salt and water. Which term describes an acid-base reaction?A. single-replacement reaction

B. decomposition

C. double-replacement reaction

D. synthesis

Answers

Answer: Option (C) is the correct answer.

Explanation:

It is given that when an acid and a base form a salt and water.

For example, $HCl + NaOH \rightarrow NaCl + H_(2)O$

Therefore, in this type of reactions there is exchange of ions between the two compounds hence, it is known as double-displacement reaction.

Thus, we can conclude that out of the given options the term an acid and a base form a salt and water describes an acid-base reaction.

c, a double-replacement reaction

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