Question

1)The chemical properties of a compound are different from the chemical properties of a mixture because:

A)the substances in a compound are chemically joined in a fixed proportion

B) the substances in a compound are always composed of at least three different types of atoms

C)mixtures are always homogeneous

D)the properties of a mixture are different from those of the substances from which it is made


2)When Kool-Aid is added to water and stirred, the water becomes uniformly colored. This is proof that a chemical change has occurred. T/F

3)Under the same conditions of temperature and pressure, a liquid differs from a gas because the particles of the liquid:

A)are in constant straight-line motion

B)take the shape of the container they occupy

C)have no regular arrangement

D)have stronger forces of attraction between them

Answer 1

Here are the following solutions:

1. A
2. F
3. B.

Answer 2

1: A

2: False

3: D

Step-by-step explanation:

1: There are many differences between compounds and mixtures. In compounds, the atoms are chemically bonded to each other, whereas in mixtures, they are not (there may be hydrogen bonds that form between the substances in the mixture, but those bonds are not strong enough to bind them irreversibly).

2: This statement is false because, this is proof of diffusion between the molecules, and not a chemical reaction. A chemical reaction can result in a colour change, however, not all colour changes are chemical reactions.

3: The reason the answer is D, is because that is the main difference between liquids and gasses. Both liquids and gasses can take the shape of the container they occupy (in the case of gasses, in a closed container, the gas will fill the container it occupies completely). Liquids and gasses both have no regular arrangement, and so this cannot be used as a difference between them. When a liquid turns into a gas, the bonds between the atoms get weaker, hence why the answer is D.