EXERCISE 7-1 Balancing and Classifiying Chemical Reactions
Click on the correct answer
1
Questions will be presented in pairs. For each reaction, first balance it with the lowest possible whole number coefficients and sum the coefficients to check your answer. The second question of each pair will ask you to classify the reaction according to the scheme: combination, decomposition, combustion, single replacement and double replacement. Example: The sum of the coefficients for
CH
4
(g) + 2 O
2
(g) = 2 H
2
O(g) + CO
2
(g) is 6. What is the sum of the coefficients for
__ C
3
H
8
(g) + __O
2
(g) = __H
2
O(g) + __CO
2
(g)?
12
13
4
18
None of the previous answers.
2
The reaction in problem 1 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
3
What is the sum of the coefficients for
__ N
2
O
5
(g) + __H
2
O(l) = __HNO
3
(aq)
4
3
2
8
None of the previous answers.
4
The reaction in problem 3 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
5
What is the sum of the coefficients for
__ KClO
3
(s) = __KCl(s) + __O
2
(g)?
3
6
5
7
None of the previous answers.
6
The reaction in problem 5 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
7
What is the sum of the coefficients for
Na(s) + __ H
2
O(l) = __NaOH(aq) + __H
2
(g)?
4
6
10
5
None of the previous answers.
8
The reaction in problem 7 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
9
What is the sum of the coefficients for
__ C
2
H
6
O(l) + __O
2
(g) = __H
2
O(g) + __CO
2
(g)?
9
8
19
11
None of the previous answers.
10
The reaction in problem 9 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
11
What is the sum of the coefficients for
__ CaCl
2
(aq) + __AgNO
3
(aq) = __ Ca(NO
3
)
2
(aq) + __AgCl(s)
4
5
6
8
None of the previous answers.
12
The reaction in problem 11 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
13
What is the sum of the coefficients for
__ NaHCO
3
(s) = __ Na
2
CO
3
(s) __H
2
O(g) + __CO
2
(g)?
4
5
2
6
None of the previous answers.
14
The reaction in problem 13 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
15
What is the sum of the coefficients for
Al(s) + __ HCl(aq) = __AlCl
3
(aq) + __H
2
(g)
4
6
13
7
None of the previous answers.
16
The reaction in problem 15 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
17
What is the sum of the coefficients for
__SO
2
(g) + __O
2
(g) = __SO
3
(g)?
3
4
7
5
None of the previous answers.
18
The reaction in problem 17 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
A and C
19
What is the sum of the coefficients for
__Cl
2
(aq) + __ NaI(aq) = __NaCl(aq) + __I
2
(aq)?
4
6
7
8
None of the previous answers.
20
The reaction in problem 19 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
21
What is the sum of the coefficients for
__BaCl
2
(aq) + __Na
3
PO
4
(aq) = __Ba
3
(PO
4
)
2
(s) + __NaCl(aq)?
12
13
4
7
None of the previous answers.
22
The reaction in problem 21 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
23
What is the sum of the coefficients for
__CuSO
4
(s) + __H
2
O(l) = __CuSO
4
.
5 H
2
O(s)?
3
5
12
7
None of the previous answers.
24
The reaction in problem 23 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
25
What is the sum of the coefficients for
__ Fe(s) + __O
2
(g) = __Fe
2
O
3
(s)?
9
3
5
7
None of the previous answers.
26
The reaction in problem 25 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
A and C
27
What is the sum of the coefficients for
__NaOH(aq) + __H
2
SO
4
(aq) = __Na
2
SO
4
(aq) + __H
2
O(l)?
4
6
5
7
None of the previous answers.
28
The reaction in problem 27 should be classified as a _________ reaction
combination
decomposition
combustion
single replacement
double replacement
29
What is the sum of the coefficients for the reaction between calcium chloride and potassium carbonate to give water soluble potassium chloride and water insoluble calcium carbonate?
4
5
6
7
None of the previous answers.
30
What is the sum of the coefficients for the reaction between magnesium nitrate and sodium phosphate to give water soluble sodium nitrate and water insoluble magnesium phosphate?
4
9
12
15
None of the previous answers.
31
Based on the nature of the reactants, classify the type of reaction they will probably undergo.
__BaCl
2
(aq) + __Na
2
SO
4
(aq) =
combination
decomposition
combustion
single replacement
double replacement
32
Classify: Zn(s) + __ HCl(aq) =
combination
decomposition
combustion
single replacement
double replacement
33
Classify: __ C
6
H
6
(l) + __O
2
(g) =
combination
decomposition
combustion
single replacement
double replacement
34
Classify: __Ba(OH)
2
(aq) + __HNO
3
(aq) =
combination
decomposition
combustion
single replacement
double replacement
35
Classify: __CaO(s) + __H
2
O(l) =
combination
decomposition
combustion
single replacement
double replacement
36
Classify: __KHCO
3
(aq) + __HCl(aq) =
combination
decomposition
combustion
single replacement
double replacement
37
Classify: __Ca(HCO
3
)
2
(s) =
combination
decomposition
combustion
single replacement
double replacement
38
Classify: __BaCl
2
(2) + __H
2
O(l) =
combination
decomposition
combustion
single replacement
double replacement
39
Classify: __Mg(s) + __Fe
2
(SO
4
)
3
(aq) =
combination
decomposition
combustion
single replacement
double replacement
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