Question

chapter 15
use vocabulary
complete each sentence with the correct term from the study guide.

1. substances formed from atoms of two or more elements are called
2. a(n) is a heterogeneous mix - ture in which solid particles settle.
3. freezing, boiling, and evaporation are all examples of
4. compounds are made from the atoms of two or more
5. is the process that can sepa - rate two liquids using physical change.

check concepts
use the figure below to answer question 19.

1. what type of property is represented by the illustration?

a) chemical
b) physical
c) conservation
d) element

1. which is an example of a chemical change?

a) boiling
b) burning

1. which type of substance is made by combining atoms?

a) colloid
b) compound

1. a visible sunbeam is an example of which of the following?

a) a chemical change
b) a physical property
c) a suspension
d) the tyndall effect

1. suppose you start to eat some chips from an open bag you left in your locker and notice they taste unpleasant. what process that causes unpleasant taste?

a) chemical change
b) physical change

1. how would you describe the evaporating fresh water from a lake?

a) chemical change
b) physical change

1. which of these warnings refers to a chemical property of the material?

a) fragile
b) sharp object
c) flammable
d) shake well

1. which of the following is an example of a physical change?

a) broken glass
b) formation of bubbles
c) rust
d) formation of a solid

Explanation:

1. Compounds are substances formed from atoms of two or more elements.
2. A suspension is a heterogeneous mixture in which solid particles settle.
3. Freezing, boiling, and evaporation are physical changes as they only change the state of matter without altering the chemical composition.
4. Compounds are made from the atoms of two or more elements.
5. Distillation is the process that can separate two liquids using physical change.
6. The illustration likely shows a physical property change as there is no indication of a chemical reaction (e.g., no new substances formed). So the answer is B. physical.
7. Burning is a chemical change as it involves a reaction with oxygen to form new substances.
8. A compound is a type of substance made from two or more different elements chemically combined.
9. A visible sunbeam is an example of the Tyndall effect, which is the scattering of light by colloidal particles.
10. The unpleasant taste of chips from an open - bag is likely due to oxidation (a chemical change).
11. Evaporating fresh water is a physical change as it is just a change of state from liquid to gas.
12. Flammable is a chemical property as it describes how a substance reacts with oxygen in a combustion reaction.
13. Broken glass is a physical change as it only changes the physical form of the glass, not its chemical composition.

Answer:

1. Compounds
2. Suspension
3. Physical changes
4. Elements
5. Distillation
6. B. physical
7. B. burning
8. B. compound
9. D. the Tyndall effect
10. A. chemical change
11. B. physical change
12. C. Flammable
13. A. broken glass