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WorksheetsChapter 20 & 21 Review
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
A charged group of atoms
a)
binary compound
b)
molecule
c)
polyatomic ion
d)
polar molecule
2.
The charge of an ion.
a)
oxidation number
b)
hydrate
c)
subscript
d)
superscript
3.
A reaction in which a substance breaks down into two or more substances.
a)
single replacement
b)
decomposition
c)
double replacement
d)
synthesis
4.
A chemical __________________ describes a chemical reaction using chemical formulas and other symbols.
a)
reaction
b)
formula
c)
equation
d)
symbol
5.
The amount of energy needed to break the original bonds is LESS then the energy RELEASED when new bonds forms.
a)
exergonic
b)
exothermic
c)
endergonic
d)
endothermic
6.
A reaction in which one element replaces another in a compound.
a)
single replacement
b)
synthesis
c)
double replacement
d)
decomposition
7.
A reaction in which two or more substances combine to form another substance.
a)
single replacement
b)
synthesis
c)
decomposition
d)
double replacement
8.
A ____________reaction gives off energy in the form of heat.
a)
exothermic
b)
exergonic
c)
endothermic
d)
endogonic
9.
A ________________ ties up a reactant and prevents it from undergoing the original reaction.
a)
polar molecule
b)
hydrate
c)
inhibitor
d)
catalyst
10.
The kind of reaction that REQUIRES energy in the form of heat.
a)
Exothermic
b)
Endothermic
c)
Endergonic
d)
Exergonic
11.
The insoluble compound that forms when two liquids combine during a double replacement reaction.
a)
catalyst
b)
precipitate
c)
ion
d)
hydrate
12.
The numbers that represent the number of units of each substance taking part in a chemical reaction are called __________________.
a)
superscripts
b)
oxidation number
c)
subscript
d)
coefficients
13.
A chemical reaction that has the same number of atoms for each element on both sides of the equation.
a)
reactants
b)
products
c)
balanced
d)
hydrate
14.
The substances on the left side of the arrow in a chemical equation.
a)
products
b)
reactants
c)
formulas
d)
coefficients
15.
What is the formula and charge for Sulfate?
a)
SO4-3
b)
SO3-4
c)
SO4-2
d)
SO4-1
16.
What is the name for C4O2 ?
a)
Carbon Dioxide
b)
Carbon Oxide
c)
Tetracarbon Dioxide
d)
Hexacarbon Dioxide
17.
What is the name Mg3(PO4)2 ?
a)
Trimagnesium Phosphate
b)
Magnesium Diphosphate
c)
Magnesium Phosphide
d)
Magnesium Phosphate
18.
Which of the following is NOT a diatomic molecule?
a)
Cl2
b)
N2
c)
F2
d)
Ca2
19.
What is the formula for Calcium Chlorate?
a)
Ca2ClO3
b)
Ca(ClO3)2
c)
C(ClO3)2
d)
Ca(ClO4)2
20.
What is the formula for Bromine gas?
a)
Br
b)
Br2
c)
Br3
21.
What is the formula for Sodium Oxide ?
a)
NaO
b)
Na3O
c)
Na2O
d)
Na4O
22.
What is the formula Pentasulfur Trichloride?
a)
S3Cl5
b)
S5Cl3
c)
SCl
d)
S4Cl3
23.
What is the formula Copper III Fluoride?
a)
CF3
b)
Cu3F
c)
CuF3
d)
C3F
24.
When balancing a chemical equation you must NEVER change a ___________.
a)
coefficients
b)
superscripts
c)
subscripts
d)
chemical name
25.
I have memorized my polyatomic ions
a)
TRUE
b)
FALSE
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