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Chapter 8
Explorer Quizzes
Explorer Quiz 2
Explorer Quiz 2
This activity contains 12 questions.
Which of the following is
not
evidence for a chemical reaction?
change in physical state
change in energy
change in color
change in solubility
Which of the following elements occurs naturally as diatomic molecules?
phosphorus
iodine
sulfur
mercury
Which of the following is a general guideline for balancing an equation?
Balance polyatomic ions as a single unit.
Write correct formulas for reactants and products.
Begin balancing with the most complex formula.
All of the above are true.
What is the coefficient of oxygen gas after the following equation is balanced?
P (s) + O
2
(g)
P
2
O
3
(s)
4
1
3
2
What is the coefficient of hydrogen gas after the following equation is balanced?
Co (s) + HCl (aq)
CoCl
3
+ H
2
(g)
1
2
3
4
What is the coefficient of KNO
3
after the following equation is balanced?
Al(NO
3
)
3
(aq) + K
2
CrO
4
(aq)
Al
2
(CrO
4
)
3
(s) + KNO
3
(aq)
2
1
3
6
Classify the following reaction:
N
2
(g) + H
2
(g)
NH
3
(g)
combination
double replacement
decomposition
single replacement
Which of the following metals will react with aqueous HCl?
Cu
Mn
Ag
Au
Which of the following compounds is
insoluble
in water?
Mg(OH)
2
Pb(C
2
H
3
O
2
)
2
(NH
4
)
2
CO
3
Na
3
PO
4
What are the products of the decomposition of KHCO
3
by heating?
K
2
CO
3
+ H
2
+ CO
2
K
2
CO
3
+ H
2
O + CO
2
K
2
CO
3
+ H
2
O + CO
K
2
O + H
2
O + CO
2
What are the products of the following neutralization reaction?
HClO
4
(aq) + NaOH (aq)
?
NaClO
4
+ H
2
NaClO
3
+ H
2
O
NaClO
3
+ H
2
NaClO
4
+ H
2
O
What is the coefficient of oxygen gas when the following equation for the combustion of ethanol, C
2
H
5
OH (e.g., in gasohol), is balanced?
C
2
H
5
OH (g) + O
2
(g)
CO
2
(g) + H
2
O (l)
3
2
1
6
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