Atomic Theory And The Periodic Table Worksheet With Answers Page 9
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1758. Which of the following groups contains only salts?
a) NaCl, HBr
b) NH
OH, LiOH
4
c) NaCl, Ca(NO
)
3
2
d) NaCl, Ca(NO
)
, NH
OH, LiOH, HBr
3
2
4
59. Which of the following correctly lists, in order, an acid, a base, and a salt?
a) HCl, NaOH, BaCl
2
b) HNO
, CaCl
, NaOH
3
2
c) NaCl, MgBr
, NH
OH
2
4
d) Ba(OH)
, HNO
, H
PO
2
3
3
4
Chemical Reactions – balancing reactions
60. Which of the following equations are balanced?
a) I and II
b) I and III
c) II and III
d) I, II and III
61. Consider the following equation: 2 Na + O
Na
O
2
2
The equation is correctly balanced.
a) True
b) False
62. In a tightly closed container, a piece of zinc reacts in hydrochloric acid to produce hydrogen gas and a
salt solution of zinc chloride. What will happen to the mass of the container?
a) It will increase.
b) It will decrease.
c) It will stay the same.
d) It will first increase, then decrease.
63. Tom has an open cup of vinegar (acetic acid) and adds some sodium carbonate. The mixture bubbles
and fizzes. After the fizzing stops, Tom finds the container is lighter (less mass) than it was originally. He
thinks it has broken the law of conservation of mass. His lab partner knows the correct answer and states:
a) “You must have made a mistake. Try it again.”
b) “Yes, you found a reaction that breaks the law of conservation of mass!”
c) “There is not enough information here. We must do the experiment again.”
d) “No, the law of conservation of mass is obeyed. Gas was produced, and it escaped into the
surrounding air.”
64. Consider the following unbalanced chemical equation:
Na + O
Na
O
2
2
What is the coefficient in front of Na in the balanced equation?
a) 1
b) 2
c) 3
d) 4
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