1.         Given the balanced equation:

2 C4H10(g) + 13 O2 (g) 8 CO2 (g) + 10 H2 O(g)

What is the total number of moles of O2 (g) that must react completely with 5.00 moles of C4H10(g )?

  1. 10.0
  2. 20.0
  3. 26.5
  4. 32.5

2.  Which equation is correctly balanced?

  1. H2 + O2 H2O
  2. Ca + Cl2 CaCl
  3. 2H2 + O2 2H2O
  4. Ca + Cl2 Ca2Cl

3.  Given the reaction: Ca + 2H2O —> Ca(OH)2 + H2
What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?

  1. 1.0
  2. 2.0
  3. 0.50
  4. 4.0

4.   Given the reaction: 2Al + 3H2SO4 —> 3H2 + Al2(SO4)3
The total number of moles of H2SO4 needed to react completely with 5.0 moles of Al is

  1. 2.5 moles
  2. 5.0 moles
  3. 7.5 moles
  4. 9.0 moles

5.  (a) Balance the equation using the smallest whole-number coefficients.

C5H12(g) + O2(g) CO2(g) + H2O(g)

(b) Using your balanced equation, calculate the total number of moles of H2O(g) produced when 5.0 moles of O2(g) are completely consumed. Round your answer to the nearest tenth of a mole.

moles
6.  Given the reaction: CH4(g) + 2O2(g) —> CO2(g) + 2H2O(g)
How many moles of oxygen are needed for the complete combustion of 3.0 moles of CH4(g)?

  1. 6.0 moles
  2. 2.0 moles
  3. 3.0 moles
  4. 4.0 moles

7.  If an equation is balanced properly, both sides of the equation must have the same number of

  1. atoms
  2. coefficients
  3. molecules
  4. moles of molecules

8.  Given the reaction: 4NH3 + 5O2 4NO + 6H2 O
What is the total number of moles of NO produced when 1.0 mole of O2 is completely consumed?

  1. 1.0 mole
  2. 1.2 moles
  3. 0.80 mole
  4. 4.0 moles

9.  What is conserved during a chemical reaction?

  1. mass, only
  2. charge, only
  3. both mass and charge
  4. neither mass nor charge

10.  Given the incomplete equation: 2N2O5(g)
Which set of products completes and balances the incomplete equation?

  1. 2N2(g) + 3H2(g)
  2. 2N2(g) + 2O2(g)
  3. 4NO2(g) + O2(g)
  4. 4NO(g) + 5O2(g)

11.  In the compound Al2O3, the ratio of aluminum to oxygen is?

  1. 2 grams of aluminum to 3 grams of oxygen
  2. 3 grams of aluminum to 2 grams of oxygen
  3. 2 moles of aluminum to 3 moles of oxygen
  4. 3 moles of aluminum to 2 moles of oxygen

12.  When the equation
__Al2(SO4)3 + __ZnCl2 —> __AlCl3 + __ZnSO4
is correctly balanced using the smallest whole number coefficients, the sum of the coefficients is

  1. 9
  2. 8
  3. 5
  4. 4

13.  Given the unbalanced equation: Al + O2 —> Al2O3
When this equation is completely balanced using smallest whole numbers, what is the sum of the coefficients?

  1. 9
  2. 7
  3. 5
  4. 4

14.  Which is a correctly balanced equation for a reaction between hydrogen gas and oxygen gas?

  1. H2(g) + O2(g) —> H2O(l) + heat
  2. H2(g) + O2(g) —> 2H2O(l) + heat
  3. 2H2(g) + 2O2(g) —> H2O(l) + heat
  4. 2H2(g) + O2(g) —> 2H2O(l) + heat

15.  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

16.  Given the reaction: PbCl2(aq) + Na2CrO4 (aq) PbCrO4 (s) + 2 NaCl(aq)

What is the total number of moles of NaCl formed when 2 moles of Na2CrO4 react completely?

  1. 1 mole
  2. 2 moles
  3. 3 moles
  4. 4 moles

17.  Given the equation: 2C2H2(g) + 5O2(g)  4CO2(g) + 2H2O(g)
How many moles of oxygen are required to react completely with 1.0 mole of C2H2?

  1. 2.5
  2. 2.0
  3. 5.0
  4. 10

18.  Given the unbalanced equation: N2(g) + H2(g) NH3(g)
When the equation is balanced using the smallest whole-number coefficients, the ratio of moles of hydrogen consumed to moles of ammonia produced is

  1. 1:3
  2. 2:3
  3. 3:1
  4. 3:2

19.  Given the unbalanced equation:  ___Al  +  ___CuSO4 ___Al2(SO4)3 + ___Cu
When the equation is balanced using the smallest whole-number coefficients, what is the coefficient of Al?

  1. 1
  2. 2
  3. 3
  4. 4

20.  Given the reaction:  C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2(l)
How many moles of C6H12O6(s ) are needed to produce 24 moles of carbon dioxide?

  1. 1.0 mole
  2. 12 moles
  3. 24 moles
  4. 4.0 moles

21.  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

22.  Given the equation:
__Ca 2+ (aq) + __PO43- (aq) —> __Ca3(PO4)2(s)
When the equation is correctly balanced, the sum of the total charge of the reactants is

  1. 0
  2. +2
  3. -3
  4. +6

23.  When the equation
__Fe2O3(s) + __CO(g) —> __Fe(l) + __CO2(g)
is correctly balanced using the smallest whole numbers, the coefficient of Fe(l) is

  1. 1
  2. 2
  3. 3
  4. 4

24.  Given the unbalanced equation:
Ca(OH)2 + (NH4)2SO4 —> CaSO4 + NH3 + H2O
What is the sum of the coefficients when the equation is completely balanced using the smallest whole-number coefficients?

  1. 5
  2. 7
  3. 9
  4. 1

25.  Given the reaction:  6 CO2 + 6 H2O C2H12O6 + 6 O2
What is the total number of moles of water needed to make 2.5 moles of C2H12O6?

  1. 2.5
  2. 6.0
  3. 12
  4. 15

26.  When the equation
__C8H16 + __O2 —> __CO2 + __H2O
is correctly balanced using the smallest whole number coefficient, the coefficient of O2 is

  1. 1
  2. 8
  3. 12
  4. 16

27.  Given the equation:  __FeCl2 + __Na2CO3 —> __FeCO3 + __NaCl
When the equation is correctly balanced using the smallest whole numbers, the coefficient of NaCl is

  1. 6
  2. 2
  3. 3
  4. 4

28.  The net ionic equation: Fe(s) + Pb2+(aq) —> Fe2+(aq) + Pb(s)
illustrates conservation of

  1. mass and charge
  2. charge but not mass
  3. mass but not charge
  4. neither mass nor charge

29.  _________

Given the reaction: Ca + 2H2O —> Ca(OH)2 + H2
How many moles of H2O are needed to react completely with 2.0 moles of Ca?

  1. 1.0 mole
  2. 2.0 moles
  3. 0.50 mole
  4. 4.0 moles

30.  Which equation illustrates conservation of mass?

  1. H2 + Cl2 —> HCl
  2. H2 + Cl2 —> 2HCl
  3. H2 + O2 —> H2O
  4. H2 + O2 —> 2H2O

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