Question

chapter 2 properties of matter
compounds (page 40)

1. what is a compound?
2. circle the letter of each sentence that is true about compounds.

a. a compound always contains at least two elements.
b. the substances that make up a compound are always joined in a fixed proportion.
c. a compound has the same properties as the elements from which it is formed.
d. a compound can be broken down into simpler substances.
mixtures (pages 41 - 42)

1. why do the properties of a mixture vary?
2. a(n) ______________ mixture is a mixture whose parts are noticeably different from one another.
3. is the following sentence true or false? a homogeneous mixture is a mixture in which it is difficult to distinguish the substances from one another.

solutions, suspensions, and colloids (pages 42 - 44)

1. a mixture can be classified as a solution, a suspension, or a colloid based on the size of its ______________ particles.
2. circle the letter of the term that identifies the homogeneous mixture that forms when sugar is dissolved in a glass of hot water.

a. solution
b. suspension
c. colloid
d. substance

1. complete the table about solutions, suspensions, and colloids.

type of mixture	relative size of largest particles	homogeneous or heterogeneous?	do particles scatter light?
	intermediate	homogeneous	yes
	large

1. circle the letter before each example of a colloid.

a. windshield wiper fluid
b. fog
c. homogenized milk
d. muddy water

1. is the following sentence true or false? if salt water is poured through a filter, the salt will be trapped on the filter.

Explanation:

1. A compound is a substance formed by the chemical combination of two or more elements in a fixed proportion.

11.

• a. True. By definition, a compound has at least two elements.
• b. True. The elements in a compound are combined in a definite ratio.
• c. False. Compounds have different properties from their constituent elements.
• d. True. Compounds can be broken down chemically into simpler substances.

1. The properties of a mixture vary because the components are not chemically combined and their proportions can change.
2. A heterogeneous mixture has parts that are noticeably different from one another.
3. True. In a homogeneous mixture, the substances are uniformly distributed and difficult to distinguish.
4. A mixture can be classified as a solution, suspension, or colloid based on the size of its solute particles.
5. When sugar is dissolved in hot water, it forms a solution (a). Solutions are homogeneous mixtures where the solute particles are very small.

17.

Type of Mixture	Relative Size of Largest Particles	Homogeneous or Heterogeneous?	Do Particles Scatter Light?
Colloid	Intermediate	Homogeneous	Yes
Suspension	Large	Heterogeneous	Yes

1. Fog (b) and homogenized milk (c) are examples of colloids. Colloids have intermediate - sized particles that scatter light.
2. False. Salt is dissolved in water and will pass through a filter as the salt ions are small enough to pass through the pores of the filter.

Answer:

1. A substance formed by the chemical combination of two or more elements in a fixed proportion.
2. a. A compound always contains at least two elements.

b. The substances that make up a compound are always joined in a fixed proportion.
d. A compound can be broken down into simpler substances.

1. Because the components are not chemically combined and their proportions can change.
2. Heterogeneous
3. True
4. Solute
5. a. solution

17.

Type of Mixture	Relative Size of Largest Particles	Homogeneous or Heterogeneous?	Do Particles Scatter Light?
Colloid	Intermediate	Homogeneous	Yes
Suspension	Large	Heterogeneous	Yes

1. b. fog, c. homogenized milk
2. False