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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
steam rising from a boiling pot of soup
B
a piece of wood shrinking as it dries out
C
a metal railing rusting in damp weather
D
alcohol evaporating from a cotton swab
2) Which process represents a chemical change?
A
A metal bar is rolled into a flat sheet.
B
A lake freezes over into ice.
C
Sand, water, and salt combine to form a mixture.
D
Vinegar bubbles when baking soda is added.
3) Which types of changes observe the law of conservation of mass?
A
only physical changes
B
only chemical changes
C
physical changes and chemical changes
D
only changes of state
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
cooking a steak
B
drying clothes in the dryer
C
chopping a tree
D
heating a cup of tea
5) Which process is an example of a chemical change?
A
adding salt to water
B
burning wood
C
melting ice
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 cloud changes shape when blown by wind.
D
A melting block of ice leaves a large puddle.
7) Which of the following types of changes does not observe the law of conservation of mass?
A
physical changes and chemical changes
B
only nuclear changes
C
only chemical changes
D
only physical 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 form a new substance
B
a physical and chemical change because it will change state
C
a purely physical change because it will change state
D
a purely physical change because it will form a new substance
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
a nuclear change
C
chemical change
D
physical change in form
*select an answer for all questions
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