Changes in Matter Answers

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21
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Which of these is an example of a physical change?

A
sugar dissolving in warm water
B
iron rusting in the presence of moist air
C
wood burning in the presence of oxygen
D
baking soda reacting with acid to form a gas
22
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Which of these is a chemical property of a substance?

A
texture
B
ductility
C
reactivity
D
conductivity
23

Which of these is an example of investigating an intensive property?

A
weighing sand in a bag
B
measuring the length of wire
C
determining if a rock is magnetic
D
recording the volume of water in a cylinder
24

A student performs the following experiment.Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation.What has most likely occurred in the beaker?

A
a chemical change in step 1 and a physical change in step 2
B
a physical change in step 1 and a chemical change in step 2
C
chemical changes in both step 1 and step 2
D
physical changes in both step 1 and step 2
25

Which term refers to a property that depends only on the amount of a substance?

A
flammability
B
extensive
C
intensive
D
reactivity

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