Question

1. what is a type of matter that cannot be separated into other substances by physical means?

a. homogeneous mixture
b. pure substance
c. heterogeneous mixture
d. solution

1. what is matter that contains more than one kind of substance and can be separated by physical means?

a. elements
b. compounds
c. mixtures

1. which of the following is not an example of physical means of separating matter?

a. filtering
b. straining
c. evaporating
d. burning

1. which of the following is not an example of a physical property?

a. color
b. density
c. rusting
d. malleability

1. which of the following is not an example of a physical change?

a. dissolving
b. freezing
c. evaporating
d. gas production

1. what is the process by which one substance changes in to a different substance?

a. chemical property
b. physical change
c. chemical reaction
d. physical property

1. which of the following is not the result of a chemical reaction?

a. gas bubbles
b. size change
c. color change
d. temperature change

1. what is a substance that cannot be broken down or separated into simpler substances by chemical means?

a. compound
b. element
c. mixture
d. solution

Explanation:

1. A pure substance has a fixed - composition and cannot be separated into other substances by physical means.
2. Mixtures contain more than one substance and can be separated by physical means.
3. Burning is a chemical change, not a physical separation method. Filtering, straining, and evaporating are physical separation techniques.
4. Rusting is a chemical property as it involves a chemical reaction (oxidation), while color, density, and malleability are physical properties.
5. Gas production is often a sign of a chemical change, while dissolving, freezing, and evaporating are physical changes.
6. A chemical reaction is the process by which one substance changes into a different substance.
7. Size change is not a typical result of a chemical reaction. Gas bubbles, color change, and temperature change can be signs of a chemical reaction.
8. An element cannot be broken down or separated into simpler substances by chemical means.

Answer:

1. b. Pure substance
2. c. Mixtures
3. d. Burning
4. c. Rusting
5. d. Gas production
6. c. Chemical reaction
7. b. Size change
8. b. Element