Question

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.

1. 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.

1. 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.
2. 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:

• Question 10: A compound is a substance formed when two or more elements chemically combine in a fixed proportion.
• Question 11:
• a: True. By definition, a compound has at least two elements.
• b: True. Compounds have a fixed composition.
• c: False. Compounds have different properties than the elements they are made from.
• d: True. Compounds can be broken down into simpler substances (elements) by chemical means.
• Question 12: The properties of a mixture vary because the substances in a mixture are not chemically combined and can be present in different amounts.
• Question 13: A heterogeneous mixture is a mixture whose parts are noticeably different from one another.
• Question 14: True. A homogeneous mixture has a uniform composition, making it difficult to distinguish the substances.
• Question 15: A mixture can be classified as a solution, a suspension, or a colloid based on the size of its dispersed particles.
• Question 16: When sugar is dissolved in hot water, it forms a solution (a).
• Question 17:
• Solution: Smallest particles, Homogeneous.
• Colloid: Intermediate particles, Yes (scatter light).
• Suspension: Large particles, Heterogeneous.
• Question 18:
• b (fog): A colloid (liquid droplets in gas).
• c (homogenized milk): A colloid (fat globules in liquid).
• Question 19: False. Salt is dissolved in water (a solution), and dissolved substances pass through a filter.

Answer:

1. A compound is a substance formed when two or more elements chemically combine in a fixed proportion.
2. a. True; b. True; d. True
3. Because the substances in a mixture are not chemically combined and can be present in different amounts.
4. heterogeneous
5. True
6. dispersed
7. a. solution
8. Solution: Smallest particles, Homogeneous; Colloid: Intermediate particles, Yes; Suspension: Large particles, Heterogeneous
9. b. fog; c. homogenized milk
10. False