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chemical reactions and balancing

Total questions: 25

Worksheet time: 44mins

Name
Class
Date
1.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
2.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
3.

Which reaction type is the following:

C5H10 + O2 --> CO2 + H2O

a)

Decomposition

b)

Synthesis

c)

Complete Combustion

d)

Double Replacement

4.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
5.

Catalysts affect

a)

the relative amount of reactants

b)

the relative amount of products

c)

the reaction rate

d)

the uncatalyzed activation energy

6.

If the product(s) of a reaction have less chemical energy than the reactant(s) and net heat is released during the reaction, then the reaction is

a)

exothermic

b)

endothermic

c)

mesothermic

d)

ohsothermic

7.

2 H2O2 ---> 2H2O + O2

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

8.

4 Fe + 3O2 ---> 2 Fe2O3

a)

decomposition

b)

combustion

c)

synthesis

d)

single replacement

9.

2 Al + 3 CuCl2 ----> 3 Cu + 2 AlCl3

a)

combustion

b)

synthesis

c)

double replacement

d)

single replacement

10.

C3H8 + 5 O2 ---> 3 CO2 + 4 H2O

a)

single replacement

b)

double replacement

c)

combustion

d)

decomposition

11.

Enzymes are important biological catalysts because they:

a)

supply the energy to initiate a biochemical reaction

b)

increase the free energy of a biochemical reaction

c)

lower the entropy and enthalpy of a biochemical reaction

d)

lower the activation energy of a biochemical reaction

12.

Because enzymes affect the speed of chemical reactions without being consumed, they are referred to as:

a)

hydrogen acceptors

b)

activation energy

c)

catalysis

d)

cytochromes

13.

The line on the graph labeled A represents the:

a)

activation energy with an enzyme

b)

activation energy without an enzyme

c)

free energy of the reactants

d)

change in entropy and enthalpy

14.
_P4+_O2 →  _P2O3
a)
3 P4+1 O2 → 2 P2O3
b)
1 P4+1 O2 → 2 P2O3
c)
1 P4+ 3 O2 → 2 P2O3
d)
1 P4+ 2 O2 → 3 P2O3
15.
_AgNO3 + _Cu →_Cu(NO3)2 + _Ag
a)
2 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 1 Ag
b)
2 AgNO3 + 1 Cu → 1 Cu(NO3)2 + 2 Ag
c)
1 AgNO3 + 2 Cu → 2 Cu(NO3)2 + 1 Ag
d)
3 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 2 Ag
16.
_Al + _HCl →_H2 + _AlCl3
a)
2 Al + 2 HCl → 2 H2 + 6 AlCl3
b)
3 Al + 3 HCl → 6 H2 + 2 AlCl3
c)
1 Al + 1 HCl → 3 H2 + 1 AlCl3
d)
2 Al + 6 HCl → 3 H2 + 2 AlCl3
17.
The large number in front of a chemical formula or compound is the ___________. 
a)
coefficient
b)
product
c)
physical
d)
chemical
18.
Substances that enter into a chemical reaction (found to the left side of the arrow) 
a)
product
b)
reactant
c)
chemical
d)
balanced equation
19.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
20.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
21.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

22.
__(NH4)3PO4 + __Pb(NO3)4 --> __Pb3(PO4)4 + __NH4NO3
a)
2,1,1,6
b)
1,2,2,3
c)
4,3,1,12
d)
4,2,1,12
23.

Catalysts affect

a)

the relative amount of reactants

b)

the relative amount of products

c)

the reaction rate

d)

the uncatalyzed activation energy

24.

Which of the following best describes the combustion reaction?

a)

hydrocarbon combines with oxygen to produce CO2 and H2O

b)

hydrogen combines with CO2 to produce O2 and H2O

c)

hydrocarbon combines with H2O to produce CO2 and O2

d)

CO2 combines with oxygen to produce hydroxide and H2O

25.

Which of the following is the balanced equation for Zn + HCl --> ZnCl2 + H2?

a)

Zn + HCl --> 2ZnCl2 + H2

b)

Zn + 2HCl --> ZnCl2 + H2

c)

2Zn + HCl --> 2ZnCl2 + H2

d)

Zn + 2HCl --> 2ZnCl2 + H2

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