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WorksheetsCoefficient Chemistry
Total questions: 24
Worksheet time: 1hrs 20mins
Name
Class
Date
1.
Chemical equations ___.
a)
describe chemical reactions
b)
show how to write chemical formulas
c)
give directions for naming chemical compounds
d)
describe only biological changes
2.
In the chemical equation H2O2 → H2O + O2, H2O is a ___.
a)
catalyst
b)
solid
c)
product
d)
reactant
3.
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for nitrogen be?
nitrogen trifluoride → nitrogen + fluorine
nitrogen trifluoride → nitrogen + fluorine
a)
2N
b)
2N2
c)
N2
d)
4N
4.
What are the coefficients that will balance the skeleton equation below?
N2 + H2 → NH3
N2 + H2 → NH3
a)
1,1,2
b)
1,3,3
c)
3,1,2
d)
1,3,2
5.
When the equation KClO3 → KCl + O2 is balanced, the coefficient of KClO3 is ___.
a)
1
b)
2
c)
3
d)
4
6.
What are the missing coefficients for the skeleton equation below?
Cr + Fe(NO3)2 → Fe + Cr(NO3)3
Cr + Fe(NO3)2 → Fe + Cr(NO3)3
a)
4,6,6,2
b)
2,3,2,3
c)
2,3,3,2
d)
1,3,3,1
7.
The product of a combination reaction is BaCl2. If one of the reactants is Ba, what is the other reactant?
a)
Cl
b)
Cl2
c)
BaCl2
d)
Ba
8.
The products of a complete combustion reaction do NOT include ___.
a)
water
b)
hydrogen
c)
carbon dioxide
9.
In a double-replacement reaction, the ___.
a)
products are always molecular
b)
reactants are two ionic compounds
c)
reactants are two elements
d)
products are a new element and a new compound
10.
What are the correct formulas and coefficients for the products of the following double-replacement reaction?
RbOH + H3PO4 →
RbOH + H3PO4 →
a)
Rb(PO4)3 + H2O
b)
RbPO4 + 2H2O
c)
Rb3PO4 + 3H2O
d)
H3Rb + PO4OH
11.
Which of the following statements is true about single-replacement reactions?
a)
They are restricted to metals.
b)
They involve a single product.
c)
Two reactants produce two products.
d)
Any metal replaces any other metal.
12.
Which of the following is the correctly balanced equation for the complete combustion of heptene, C7H14?
a)
C7H14 + 14O → 7CO + 7H2O
b)
C7H14 + 7O2 → 7CO + 7H2O
c)
2C7H14 + 21O2 → 14CO2 + 14H2O
d)
C7H14 + O2 → C7O2 + 7H2
13.
The equation Mg + 2HCl → MgCl2 + H2 is an example of which type of reaction?
a)
combination reaction
b)
single-replacement reaction
c)
double-replacement reaction
d)
decomposition reaction
14.
The equation 2C3H7OH + 9O2 → 6CO2 + 8H2O is an example of which type of reaction?
a)
combustion reaction
b)
single-replacement reaction
c)
double-replacement reaction
d)
decomposition reaction
15.
What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
a)
Br2 + NaI → NaBr2 + I
b)
Br2 + 2NaI → 2NaBr + I2
c)
Br + NaI2 → NaBrI2
d)
Br + NaI2 → NaBr + I2
16.
Which of the following is an INCORRECT interpretation of the balanced equation shown below?
2S + 3O2 → SO3
2S + 3O2 → SO3
a)
2 atoms S + 3 molecules O2 → 2 molecules SO3
b)
2 g S + 3 g O2 → 2 g SO3
c)
2 mol S + 2 mol O2 → 2 mol SO3
d)
none of the above
17.
Calculate the number of moles of Al2O3 that are produced when 0.60 mol of Fe is produced in the following reaction.
2Al + 3FeO → 3Fe + Al2O3
2Al + 3FeO → 3Fe + Al2O3
a)
0.20 mol
b)
0.40 mol
c)
0.60 mol
d)
0.90 mol
18.
When iron rusts in air, iron (II) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction?
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
a)
1.2 mol
b)
1.8 mol
c)
2.4 mol
d)
3.2 mol
19.
Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen?
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
a)
12.0 g
b)
23.9 g
c)
47.8 g
47.8 g
47.8 g
d)
95.6 g
20.
Mercury can be obtained by reacting mercury (II) sulfide with calcium oxide. How many grams of caclium oxide are needed to produce 36.0 g Hg?
4HgS + 4CaO → 4Hg + 3CaS + CaSO4
4HgS + 4CaO → 4Hg + 3CaS + CaSO4
a)
1.80 g
b)
7.56 g
c)
10.1 g
d)
13.4 g
21.
How many liters of hydrogen gas are needed to react with CS2 to produce 2.5 L of CH4 at STP?
4H2(g) + CS2(l) → CH4(g) + 2H2S(g)
4H2(g) + CS2(l) → CH4(g) + 2H2S(g)
a)
2.50 L
b)
5.00 L
c)
7.50 L
d)
10.0 L
22.
Which of the following is the limiting reactant in the reaction shown below?
2H2 + O2 → 2H2O
2H2 + O2 → 2H2O
a)
50 molecules of H2
b)
50 molecules of O2
c)
neither a nor b is limiting
d)
both a and b are limiting.
23.
A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
a)
497 L
b)
2.5 L
c)
14 L
d)
0.40 L
24.
In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g of Ag. What is the percent yield of silver in this reaction?
Cu + 2AgNO3 → Cu(NO3)2 + 2 Ag
Cu + 2AgNO3 → Cu(NO3)2 + 2 Ag
a)
56.7%
b)
77.3%
c)
88.2%
d)
176%
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