Download Balancing Equations Study Guide

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Forensics Balancing Chemical Equations Study Guide
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Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. S8 + O2 ----> SO2
When the above reaction is balanced, the coefficients from left to right are
a. 0, 8 ---> 0
b. 0, 8 ---> 8
c. 1, 8 ---> 2
d. 1, 8 ---> 8
____
2. CH4+ O2 ----> CO2 + H2O
When the above reaction is balanced, the coefficients from left to right are
____
3. CuCl2 + Fe ----> Cu + FeCl3
When the above reaction is balanced, the coefficients from left to right are
____
4. LiCl + Al(OH)3 ----> AlCl3 + LiOH
When the above reaction is balanced, the coefficients from left to right are
____
5. C6H12O6 + O2 ----> CO2 + H2O
When the above reaction is balanced, the coefficients from left to right are
a. 1, 6 ---> 6, 6
b. 2, 12 ---> 6, 12
c. 2, 16 ---> 12, 9
d. 1, 9 ---> 6, 6
____
6. CuBr2 + Li2CO3 ----> CuCO3 + LiBr
When the above reaction is balanced, the coefficients from left to right are
____
7. Octane (C8H18), a component of gasoline, reacts with oxygen to produce carbon dioxide and water vapor.
The balanced equation for this reaction is
a. C8H18 + 9 O2 ---> 8 CO2 + 9 H2O
b. 2 C8H18 + 25 O2---> 8 CO2 + 9 H2O
c. C8H18 + 50 O2---> 16 CO2 + 18 H2O
d. 2 C8H18 + 25 O2---> 16 CO2 + 18 H2O
____
8. Potassium hydroxide and barium chloride react to produce barium hydroxide and potassium chloride. The
balanced equation for this reaction is
____
9. When the following reaction is balanced, the coefficients are:
_____S8 + _____P4

_____P4S3
____ 10. The balanced equation for the reaction of chlorine gas with copper (II) metal is:
____ 11. Consider the following reaction of molybdenum sulfide and oxygen gas:
MoS2(s) + O2(g) -----> MoO3(s) + SO2(g)
When this equation is balanced the coefficient in front of the MoO3(s) is
____ 12. What is the coefficient of water after balancing the following equation?
Li(s) + H2O(l)  LiOH(aq) + H2(g)
____ 13. 1.
Methane, CH4, can be used as fuel in an automobile to reduce pollution. What is the
coefficient of oxygen in the balanced equation for the reaction?
CH4(g) + sparkO2(g)  CO2(g) + H2O(g)
a. 1
b. 2
c. 3
d. 4
e. none of the above
____ 14. Which of the following reactions is a combustion reaction?
a. C5H12+ 8 O2 ----> 5 CO2 + 6 H2O
b. 3 K + FeCl3 ---> 3 KCl + Fe
c. 2 KBr ---> 2 K + Br2
d. 3 F2 + N2 ---> 2NF3
e. NaCl(aq) + AgNO3(aq) ---> AgCl(s) + NaNO3(aq)
____ 15. What products are produced in the combustion of hydrocarbons
____ 16. HCl ----> H2+ Cl2
This reaction is an example of
____ 17. A reaction in which a substance breaks down to form simpler substances is an example of
____ 18. Consider the reaction of copper sulfate pentahydrate:
CuSO4•5H2O(s) + Energy

CuSO4(s) +
This reaction can be classified as a:
5H2O(g)
____ 19. Consider the electolysis of table salt:
2 NaCl(l) + Energy ----> 2 Na(s) + Cl2(g)
This reaction can be classified as a
____ 20. Which type of reaction has the general form
AB ----> A + B ?
____ 21. A reaction in which a precipitate forms when two solutions are mixed is an example of
____ 22. Consider the reaction of nitric acid and lithim hydroxide:
HNO3(aq) + LiOH(aq)

LiNO3(aq) + H2O(1)
This reaction can be classified as a:
____ 23. Consider the reaction of phosphoric acid and lithium hydroxide:
2 Na3PO4(aq) + 3 MgCl2(aq) ----> Mg3(PO4)2(s) + 6 NaCl(aq)
This reaction can be classified as a
____ 24. Consider the reaction of iron and copper sulfate:
Fe(s) + CuSO4(aq)
 FeSO4(aq) + Cu(s)
This reaction can be classified as a
____ 25. Which type of reaction has the general form
A + BC ----> AC + B?
____ 26. The chemical joining of two or more elements to form a compound is known as
____ 27. A reaction in which simpler substances combine to form a more complex substance is an example of
____ 28. Consider the reaction of ammonia and hydrogen chloride gas:
NH3(s) + HCl(g)  NH4Cl(s)
This reaction can be classified as a:
____ 29. Consider the reaction of nitrous oxide and oxygen gas:
2NO(g) + O2(g) ----> 2NO2(g)
This reaction can be classified as a
____ 30. Consider the reaction of hydrogen gas and chlorine gas:
H2(g) + Cl2(g) ----> 2HCl(g) + Energy
This reaction can be classified as a
____ 31. Which of the following types of chemical reactions is illustrated below?
KHCO3(s)  K2CO3(s) + H2O(g) + CO2(g)
____ 32. Which of the following types of chemical reactions is illustrated below?
Sr(s) + H2O(l)  Sr(OH)2(aq) + H2(g)
____ 33. Determine the type of chemical reaction for the following:
2NaI + Pb(NO3)2  2NaNO3 + PbI2
____ 34. Determine the type of chemical reaction for the following:
CS2 + 2F2  CF4 + 2S
____ 35. What are the products from the following double-replacement reaction?
BaCl2 (aq) + K2SO4 (aq) 

____ 36. What are the products from the following double replacement reaction?
a.
b.
c.
d.
e.
AgNO3 (aq) + Li3PO4 (aq) 
Ag3P and LiNO3
Ag3PO3 and 3LiNO2
Ag3PO4 and 3LiNO3
Ag3PO4 and LiNO2
AgPO4 and LiNO3
____ 37. Predict the products of the following double replacement reaction.
Sodium sulfide + copper (II) sulfate 


____ 38. Predict the products of the following double replacement reaction.
Calcium hydroxide + Iron (III) chloride 


____ 39. What is the coefficient for sodium hydroxide in a balanced chemical equation for the reaction between
aqueous sodium hydroxide and hydrochloric acid.
____ 40. What is the coefficient for barium chloride in a balanced chemical equation for the reaction between barium
chloride and sodium sulfate.
____ 41. What are the products from the following single replacement reaction?
a.
b.
c.
d.
Al (s) + Pb(NO3)2 (aq) 
3Pb and 2Al(NO3)3
3Pb and 2Al(NO2)3
PbO and Al(NO3)3
PbO and Al(NO2)3
____ 42. What is the coefficient for elemental silver in a balanced chemical equation showing the reaction between
copper and silver nitrate. (use copper(II) on the product side and silver has a +1 charge.)
____ 43. What is the coefficient for hydrogen gas in a balanced chemical equation showing the reaction between
potassium and water.
____ 44. What is the coefficient for lithium iodide in a balanced chemical equation showing the reaction between
chlorine gas and aqueous lithium iodide.
____ 45. What is the coefficient for lithium in a balanced chemical equation showing the reaction between lithium and
water.