Download Reactions and Stoichiometry Practice Problems

Reactions and Stoichiometry Practice Problems
1) Which of the following is an example of a physical change?
A) burning coal
B) converting water to hydrogen and oxygen
C) baking a cake
D) digesting a cheeseburger
E) grinding coffee beans
1)
2) Which of the following is a chemical change?
A) bending a steel rod
B) making a snowman
C) melting gold
D) cutting a rope
E) burning sugar
2)
3) A chemical equation is balanced when
A) the total number of molecules is the same in reactants and products.
B) the charge on each atom is the same in reactants and products.
C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the
products.
D) the number of atoms of each element is the same in reactants and products.
3)
4) Balance each of the following reactions and state what type of reaction it is?
A)
CaCl2 +
Na2SO4
CaSO4 +
B)
N2 +
O2
NO
C)
H2 O
D)
KOH +
E)
Zn +
F)
C5 H8 +
O2
CO2 +
H2O
G)
C6 H14 +
O2
CO2 +
H2O
H)
Al2 (SO4 ) 3 +
electricity
H2 +
O2
HNO3
HCl
NaCl
H2 O +
ZnCl2 +
KOH
KNO3
H2
Al(OH)3 +
1
K2 SO4
4)
5) Balance the following reactions:
A)
K3 PO4 +
B)
Al +
Cl2
C)
SO3 +
H2 O
D)
Fe +
HCl
E)
NH3 +
F)
N2 H4 +
5)
Ca(NO3)2
Ca3 (PO4)2 +
KNO3
AlCl3
H2 SO4
FeCl3 +
NO
H2
N2 +
H2 O2
H2 O
N2 +
H2 O
6) How many eggs are in 6.79 dozen?
6)
7) How many atoms are in 6.79 moles?
7)
8) One mole of any substance contains how many things?
8)
9) Calculate the molar mass of potassium chloride.
9)
10) What is the molar mass of copper(II) sulfate?
10)
11) How many moles of water are present in 75.0 g H2 O?
11)
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12) Without doing any calculations, how many moles of calcium are in 1 mole of
hydroxyapatite, Ca5 (PO4 )3 OH , a major compound in human bones and teeth?
12)
13) How many moles of carbon atoms are there in 0.521 mole of C2H6?
13)
14) How many carbon atoms are there in 0.521 mole of C2 H6?
14)
15) What is the molar mass of sucrose (C12H22O11)?
15)
16) How many carbon atoms are in 2.5 moles of sucrose (C12H22O11)?
16)
17) How many carbon atoms are in 2.5 grams of sucrose (C12H22O11)?
17)
18) How many moles of K2SO4 are in 15.0 g of K2SO4?
18)
19) How many potassium atoms are in 15.0 g of K2 SO4 ?
19)
20) 3.00 moles of NO2 has what mass?
20)
21) 3.00 moles of NO2 contains how many oxygen atoms?
21)
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22) 3.00 moles of NO2 contains how many grams of nitrogen?
22)
23) Using the following unbalanced reaction:
23)
Mg +
O2
MgO
A) What is the number of moles of oxygen gas needed to react with 4.0 moles of Mg?
B) How many moles of MgO are produced when 0.20 mole of O2 reacts completely?
C) How many moles of magnesium are needed to react with 16.0 g of O2?
D) How many grams of magnesium are needed to produce with 32.9 g of MgO?
24) Using the following unbalanced reaction:
Mg3N2 +
H2 O
24)
Mg(OH)2 +
NH3
A) What is the number of moles of magnesium nitride needed to react with 2.35 moles of
water?
B) How many grams of magnesium hydroxide are produced when 1.20 moles of
magnesium nitride react?
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25) How many grams of NO are required to produce 145 g of N2 in the following unbalanced
reaction?
NH3 +
NO
N2 +
25)
H2 O
26) In the reaction of nitrogen gas with hydrogen gas to form ammonia gas, how many moles of
hydrogen gas are needed to react with 3.42 moles of nitrogen gas?
26)
27) Hydrogen gas combusts in oxygen gas forming water vapor. How many grams of
hydrogen gas are needed to produce 1.80 g of water?
27)
28) Aluminum metal reacts with chlorine gas to produce solid aluminum chloride. How many
grams of aluminum chloride are produced when 12.7 g of aluminum metal reacts
completely?
28)
29) Aqueous aluminum chloride and water are formed when solid aluminum oxide is
submersed in hydrochloric acid. Find the mass of aluminum oxide that reacts when 0.250
moles of HCl react.
29)
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30) How many grams of CO2 are produced when 125 g of C5 H12 is burned in excess oxygen?
30)
31) How many grams of CO2 are produced when 324 g of C2 H6 is burned in excess oxygen?
31)
32) How many grams of CO2 are produced when 324 g of C2 H6O is burned in excess oxygen?
32)
33) In the reaction of aqueous silver nitrate with aqueous sodium chloride to produce aqueous
sodium nitrate and solid silver chloride, how many grams of silver chloride will be
produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride?
33)
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