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1) Given the balanced equation representing a reaction:
4Al(s) + 3O2(g)
2Al2O3(s)
Which type of chemical reaction is represented by this equation?
1) double replacement
2) single replacement
3) substitution
4) synthesis
2) Given the balanced equation representing a reaction:
4NH3 + 5O2
4NO + 6H2O
What is the minimum number of moles of O2 that are needed to completely react with 16 moles
of NH3?
1) 16 mol
2) 20. mol
3) 64 mol
4) 80. mol
3) Given the balanced equation representing a
reaction:
Which type of reaction is represented by this equation?
1) decomposition
2) double replacement
3) single replacement
4) synthesis
4) Given the reaction:
4 Al + 3 O2 ® 2 Al2O3
How many moles of Al2O3 will be formed when 27 grams of Al reacts completely with O2?
1) 1.0
2) 2.0
3) 0.50
4) 4.0
5) Which equation is correctly balanced?
1) H2 + O2 ® H2O
2) Ca + Cl2 ® CaCl
3) 2 H2 + O2 ® 2 H2O
4) Ca + C12 ® Ca2Cl
6) When the equation
is correctly balanced using whole-number coefficients, the sum of all the coefficients is
1) 6
2) 7
3) 8
4) 9
7) During all chemical reactions, mass, energy, and charge are
1) absorbed
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2) conserved
3) formed
4) released
8) Given the reaction:
2 C2H6(g) + 7 O2(g) ® 4 CO2(g) + 6 H2O(g)
At STP, what is the total volume of CO2(g) formed when 6.0 liters (L) of C2H6(g) are completely
oxidized?
1) 24 L
2) 12 L
3) 6.0 L
4) 4.0 L
9) Given the word equation:
sodium chlorate ® sodium chloride + oxygen
Which type of chemical reaction is represented by this equation?
1) double replacement
2) single replacement
3) decomposition
4) synthesis
10) Which products are obtained when CH4(g) burns completely in an excess of oxygen?
1) CO and H2O
2) CO and C
3) CO2 and H2O
4) CO2 and CO
11) Given the incomplete equation representing a reaction:
2C6H14 + ______ O2 ® 12CO2 + 14H2O
What is the coefficient of O2 when the equation is completely balanced using the smallest
whole-number coefficients?
1) 13
2) 14
3) 19
4) 26
12) Given the incomplete equation:
4Fe + 3O2
2X
Which compound is represented by X?
1) FeO
2) Fe2O3
3) Fe3O2
4) Fe3O4
13) Given the reaction:
4 Al + 3 O2 ® 2 Al2O3
What is the total number of moles of aluminum oxide that can be formed when 54 grams of
aluminum reacts completely with oxygen?
1) 1.0 mole
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2) 2.0 moles
3) 3.0 moles
4) 4.0 moles
14) Given the equation:
6 CO2(g) + 6 H2O(l) ® C6H12O6(s) + 6 O2(g)
What is the minimum number of liters of CO2(g), measured at STP, needed to produce 32.0
grams of oxygen?
1) 264 L
2) 32.0 L
3) 192 L
4) 22.4 L
15) Which equation represents a decomposition reaction?
1) CaCO3(s) ® CaO(s) + CO2(g)
2) Cu(s) + 2AgNO3(aq) ®
2Ag(s) + Cu(NO3)2(aq)
3) 2H2(g) + O2(g) ® 2H2O(l)
4) KOH(aq) + HCl(aq) ® KCl(aq) + H2O(l)
16) Given the unbalanced equation:
What is the coefficient of O2 when the equation is balanced correctly using the smallest whole
number coefficients?
1) 1
2) 2
3) 3
4) 4
17) Given the unbalanced equation:
When the equation is correctly balanced using the smallest whole-number coefficients, what is
the coefficient of CO?
1) 1
2) 2
3) 3
4) 4
18) Given the balanced equation representing a reaction:
2CO(g) + O2(g)
2CO2(g)
What is the mole ratio of CO(g) to CO2(g) in this reaction?
1) 1:1
2) 1:2
3) 2:1
4) 3:2
19) Given the balanced equation representing a reaction:
H+(aq) + OH–(aq) ® H2O( ) + energy
In this reaction there is a conservation of
1) mass, only
2) mass and charge, only
3) charge and energy, only
4) charge, energy, and mass
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20) Given the reaction:
2 C2H6 + 7 O2 ® 4 CO2 + 6 H2O
What is the total number of CO2 molecules produced when one mole of C2H6 is consumed?
1) 6.02 × 1023
2) 2(6.02 × 1023)
3) 3(6.02 × 1023)
4) 4(6.02 × 1023)
21) Given the incomplete equation:
2 N2O5(g) ®
Which set of products completes and balances the incomplete equation?
1) 2 N2(g) + 3 H2(g)
2) 2 N2(g) + 2 O2(g)
3) 4 NO2(g) + O2(g)
4) 4 NO(g) + SO2(g)
22) Given the balanced equation:
X + Cl2
C2H5Cl + HCl
Which molecule is represented by X?
1) C2H4
2) C2H6
3) C3H6
4) C3H8
Base your answers to questions 23 and 24 on the information below.
The reaction between aluminum and an aqueous solution of copper(II) sulfate is represented by
the unbalanced equation below.
Al (s) + CuSO4(aq)
Al2(SO4)3(aq) + Cu(s)
23) Identify the type of chemical reaction represented by the equation.
24) Balance the equation below, using the smallest whole-number coefficients.
____Al(s) + ____CuSO 4(aq) ® ____Al2(SO4)3(aq) + ____Cu(s)
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25) During a laboratory activity, a student reacted a piece of zinc with 0.1 M HCl(aq).
Complete the equation belowby writing the formula of the missing product.
Zn(s) + 2HCl(aq)
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________(aq) + H2(g)