Unit Test — Unit test Answers

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How many atoms of each element are in the chemical formula Ca(OH)2?

A
1 calcium, 1 oxygen, and 1 hydrogen
B
1 calcium, 2 oxygen, and 2 hydrogen
C
2 calcium, 1 oxygen, and 2 hydrogen
D
2 calcium, 2 oxygen, and 2 hydrogen
23

While researching scuba diving, Pablo reads how hot a tank should get while being filled with air. Which law best explains why the scuba tank would heat up?

A
Gay-Lussac’s law, because as the pressure decreases, the temperature increases
B
Gay-Lussac’s law, because as the pressure increases, the temperature increases
C
Boyle’s law, because as the volume decreases, the temperature increases
D
Boyle’s law, because as the pressure increases, the temperature increases
24

Which would show an example of how physical changes are reversible?

A
cutting a gold bar in two pieces and then putting the pieces next to each other
B
burning a match and then relighting it
C
melting tin and then cooling it into a mold
D
combining sodium and chlorine to make the new material of table salt
25

During which change of state do atoms lose energy?

A
sublimation
B
freezing
C
boiling
D
melting

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