2.1 Metals Answers

6 verified answers
21
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Indicators change color when an acid and a base are mixed together. The change in color most likely indicates that

A
a chemical change has occured.
B
a physical change has occured.
C
a new acid has been produced.
D
a new base has been produced.
22
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Which statement about the physical change of liquid water boiling into steam is true?

A
The heat added represents an energy change.
B
The action cannot be reversed.
C
The steam cannot conserve mass.
D
The weight lost represents a mass change.
23

Which liquid is the most viscous?

A
syrup
B
water
C
milk
D
apple juice
24

A chemist mixes oxygen gas and hydrogen gas to form water, which is composed of one oxygen and two hydrogen atoms per molecule. What has occurred?

A
a chemical change
B
a physical change
C
combustion
D
precipitation
25

Which best describes why a liquid needs a container when a solid does not?

A
Solids fill their containers, and liquids have definite shapes.
B
Solids have definite shapes, and liquids fill their containers.
C
Solids particles will expand to fill their containers, and liquid particles will expand as well.
D
Solids particles expand to fill their containers, and liquid particles do not.

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