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Chapter 7: Chemical Reactions Review Sheet

1) In a chemical reaction

reactants

Name:

undergo a change to become

products

2) A representation of a reaction in formulas is called a

chemical

equation

3) In the law of conservation of massthe massof

reactants

must be equal to the massof

products

in a reaction.

4) To make the atoms of reactants equal to the atoms of products in an equation, you must

balance

a reaction. 5) Balance these equations: a)

4 Fe +

3 O2

b)

WO3

c)

2 PbS

d)

Na2SO4

e)

SiO2

f)

Al(OH)3

g)

2 Cr2O3

h)

CaCO3

2 Fe2O3

3 H2 →

+

W

3 O2 →

+

+

2

+

KCl →

+ →

3 HCl

+

+

single replacement

2 SO2

2 NaCl +

SiC

3 Si →

CaO

+ 3 H2O

2 PbO +

2 C →

+

synthesis

AlCl3

4 Cr +

K2SO4

double replacement

2 CO

+

3 H2O

3 SiO2

CO2 balanced

double replacement

single replacement

decomposition

6) Classify the reactions above by writing the reaction type on the line provided. (No line = no type) 7) What type of reaction only produces one product?

synthesis

8) What type of reaction has only one reactant?

decomposition

9) What type of reaction has a single element reacting with a compound and replacing an element in that compound ? single replacement


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