Chemistry: Matter and Change

Section 2: Changes in Matter

Self Check Quizzes

1
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
A)The ash has the same mass as the log, although a large percentage of it blows away.
B)The law of conservation of mass applies to changes of state but not to chemical reactions.
C)The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
D)The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
2
In the chemical reaction shown above, how do you classify hydrogen and oxygen?

2H2 + O2 → 2H2O
A)products
B)reactants
C)physical changes
D)chemical properties
3
A(n) ____________ is a transition from one state of matter to another.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/007874637x/514694/fig3_7.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (62.0K)</a>
A)chemical change
B)phase change
C)extensive property
D)intensive property
4
Which of the following is not evidence of a chemical reaction?
A)spoiled food
B)rust
C)melting
D)color change
5
In the chemical reaction shown above, what is the beginning mass of mercuric oxide?

2HgO (? Grams) → 2Hg (200 grams) + O2 (16 grams)
A)184 grams
B)200 grams
C)16 grams
D)216 grams
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