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WorksheetsReaction Types, Balancing Reactions, and Stoichiometry
Total questions: 25
Worksheet time: 41mins
Name
Class
Date
1.
What is the name for the solid formed during a reaction?
a)
Precipitate
b)
Gas
c)
Compound
d)
Aqueous
2.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
3.
The following is what type of reaction:
NH3 + HCl → NH4Cl
NH3 + HCl → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
4.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
5.
Balance this equation:
2Li + Cl2 → LiCl
2Li + Cl2 → LiCl
a)
2Li + Cl2 → 4LiCl2
b)
2Li + Cl2 → LiCl2
c)
2Li + Cl2 → 2LiCl
d)
2Li + 2Cl2 → 2 LiCl2
6.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 reacts with 8 moles O2?
How many moles of water can be produced if 8 moles H2 reacts with 8 moles O2?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
7.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
8.
What is the molar mass of (NH4)2CO3 ?
a)
144 g
b)
138 g
c)
96 g
d)
78 g
9.
C5H12O (l) combusts in air. How many grams of water are produced when 56.44 grams of C5H12O combusts?
a)
69.21 g H2O
b)
55.44 g H2O
c)
20.55 g H2O
d)
35.46 g H2O
10.
_________________ are the elements and compounds that enter into a chemical reaction (on the left side of the arrow).
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
11.
Which of the following is an example of a synthesis reaction:
a)
2 H2O → 2 H2 + O2
b)
2 Na + Cl2 → 2 NaCl
c)
CH4 + 2 O2 → 2 H2O + CO2
d)
2 HCl + Zn → ZnCl2 + H2
12.
How many atoms are there TOTAL in one molecule of H2SO4
a)
6
b)
5
c)
7
d)
3
13.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
14.
Chemical reactions that involve a net absorption of energy are known as ________________________.
a)
Endothermic
b)
Exothermic
c)
Boring
d)
Explosive
15.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
16.
Heating up two reactants will make the reaction...
a)
stay the same
b)
go slower
c)
become constant
d)
go faster
17.
What type of chemical reaction is this?
Al(OH)3 → Al2O3 + H2O
Al(OH)3 → Al2O3 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
18.
What does the arrow stand for in a chemical equation?
3 CuCl2 + 2 Na3PO4 → Cu3(PO4)2 + 6 NaCl
3 CuCl2 + 2 Na3PO4 → Cu3(PO4)2 + 6 NaCl
a)
Changes
b)
Looks like
c)
Yields
d)
Is
19.
What do the coefficients tell us in a chemical equation?
a)
The number of atoms within the compound or element.
b)
The ratio of elements/compounds in the balanced equation.
20.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 → _Bi2O3
_Bi + _O2 → _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
21.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Matter cannot be created or destroyed, merely rearranged
d)
None of these
22.
What must go in the blank space to balance the equation?
4Fe + _O2 → 2Fe2O3
4Fe + _O2 → 2Fe2O3
a)
1
b)
2
c)
3
d)
4
23.
What is H2O in the following equation:
2 H2 + O2 → 2 H2O
2 H2 + O2 → 2 H2O
a)
Ion
b)
Product
c)
Reactant
d)
Unbalanced
24.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
25.
How many moles are in 88 g of propane, C3H8.
a)
2.0
b)
16.0
c)
0.051
d)
3,872
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