Question

1. according to information in “physical changes,” what is matter made of?

a. matter is made of different chemicals and colors
b. matter is made of tiny particles called atoms
c. matter is made of heat and odors
d. matter is made of water, sunlight, and soil

1. according to the text “chemical changes,” what causes rust and a change in color on iron?

a. rust is caused when two objects are rubbed together very quickly
b. rust is caused when the iron turns sour and begins to smell
c. rust is caused when iron reacts with water and oxygen.
d. rust is caused when iron reacts with smoke and heat.

1. which of the following choices is not a fact about chemical changes of matter?

a. scientists often call chemical changes chemical reactions
b. chemical changes can be reversed
c. chemical changes change the properties of substances such as their color, luster, odor, or hardness.
d. there are often clues such as color change, odor, or giving off light, that are signs a chemical change has happened.

1. what text feature should a reader use if he or she wants to know the definition of the word odor?

a. the glossary
b. the photographs
c. the headings
d. the caption

1. when water goes through a physical change and turns into gas, what is another term used to describe the water when it is a gas?

a. solid
b. liquid
c. water vapor
d. gasoline

Explanation:

• For question 6: Matter is composed of tiny particles called atoms, which is a fundamental concept in chemistry.
• For question 7: Rust on iron is formed when iron reacts with water and oxygen, a well - known chemical reaction.
• For question 8: Chemical changes are usually irreversible, so the statement that chemical changes can be reversed is incorrect.
• For question 9: A glossary is used to find the definitions of words.
• For question 10: When water turns into a gas through a physical change, it is called water vapor.

Answer:

1. b. Matter is made of tiny particles called atoms
2. c. Rust is caused when iron reacts with water and oxygen
3. b. Chemical changes can be reversed
4. a. The glossary
5. c. water vapor