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7.1 Review CC
Test Description: Physical and Chemical Changes
Instructions: Answer all questions to get your test result.
1) There are several differences between chemical and purely physical changes. Which process is an example of a chemical change?
A
a piece of wood shrinking as it dries out
B
alcohol evaporating from a cotton swab
C
steam rising from a boiling pot of soup
D
a metal railing rusting in damp weather
2) Which process represents a chemical change?
A
Sand, water, and salt combine to form a mixture.
B
A lake freezes over into ice.
C
Vinegar bubbles when baking soda is added.
D
A metal bar is rolled into a flat sheet.
3) Which types of changes observe the law of conservation of mass?
A
only chemical changes
B
only changes of state
C
only physical changes
D
physical changes and chemical changes
4) Chemical changes result in new substances with new physical properties. Purely physical changes do not result in new substances. Which process is an example of a chemical change?
A
chopping a tree
B
drying clothes in the dryer
C
heating a cup of tea
D
cooking a steak
5) Which process is an example of a chemical change?
A
burning wood
B
melting ice
C
adding salt to water
D
breaking a glass bottle
6) Which observation is a sign of a chemical change?
A
A rotting potato gives off a bad smell.
B
A plaster statue breaks when it falls onto the floor.
C
A melting block of ice leaves a large puddle.
D
A cloud changes shape when blown by wind.
7) Which of the following types of changes does not observe the law of conservation of mass?
A
only physical changes
B
only nuclear changes
C
only chemical changes
D
physical changes and chemical changes
8) A beaker containing ice and water is placed on a warm hotplate. What type of change would you expect the ice to undergo?
A
a physical and chemical change because it will change state
B
a purely physical change because it will form a new substance
C
a physical and chemical change because it will form a new substance
D
a purely physical change because it will change state
9) Tearing paper into pieces is an example of what kind of change?
A
a physical change
B
a change in energy
C
a chemical change
D
a change in mass
10) Baking bread is an example of what kind of change?
A
physical change in state
B
physical change in form
C
a nuclear change
D
chemical change
*select an answer for all questions
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