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WorksheetsCh. 7 Test Review
Total questions: 24
Worksheet time: 12mins
Name
Class
Date
1.
What has to be a reactant in a combustion reaction?
a)
CO2
b)
H2O
c)
O2
d)
CO
2.
An enzyme is a special kind of catalyst that works to
a)
speed up a specific biochemical reaction.
b)
break down chemical elements.
c)
slows down a chemical reaction.
d)
maintains the correct temperature in a reaction.
3.
What is the general form for a synthesis reaction?
a)
A + BX → AX + B
b)
A + B → AB
c)
AB → A + B
d)
AX + BY → AY + BX
4.
In a balanced chemical reaction, the total mass of the products always equals the
a)
molar mass of the reactants.
b)
atomic mass of the reactants.
c)
total mass of the reactants.
d)
proportional masses of the reactants.
5.
A chemical equation is balanced by changing or adding
a)
reactants
b)
coefficients
c)
subscripts
d)
chemical symbols
6.
The product of the synthesis reaction between sodium and chlorine gas is
a)
copper (II) chloride.
b)
carbon dioxide.
c)
sodium chloride.
d)
polyethylene.
7.
In an exothermic reaction, energy is transferred from
a)
the container to the chemicals.
b)
one reactant to another.
c)
the surroundings to the reactants.
d)
the reactants to the surroundings.
8.
What happens in a chemical reaction?
a)
Atoms are rearranged.
b)
Molecules are created.
c)
Atoms are created.
d)
Atoms are destroyed.
9.
What kind of reaction is represented by the equation CH4 + 2O2 --> CO2 + 2H2O?
a)
synthesis
b)
combustion
c)
decomposition
d)
single displacement
10.
What kind of reaction is represented by the equation 2KI + Pb(NO3)2 --> 2KNO3 + PbI2?
a)
double
b)
single
c)
decomp
d)
synthesis
11.
What is the general form for a double-displacement reaction?
a)
AX + BY --> AY + BX
b)
AX + B --> BX + A
c)
A + B --> AB
d)
AB --> A + B
12.
What is the general form for a single-displacement reaction?
a)
A + B --> AB
b)
AX + B --> BX + A
c)
AB --> A + B
d)
AX + BY --> AY + BX
13.
In what kind of reaction does a single compound break down into two or more simpler products?
a)
Synthesis
b)
Decomp
c)
Single
d)
Double
14.
In what kind of reaction do two or more reactants come together to form a new product?
a)
Synthesis
b)
Decomp
c)
Single
d)
Double
15.
If no number is written to the left of a formula in a chemical equation, what number is assumed to be there?
a)
0
b)
1
c)
2
d)
3
16.
How many atoms of oxygen are represented in 2Ca(NO3)2?
a)
4
b)
6
c)
10
d)
12
17.
In a chemical reaction, what is the relationship between the total mass of the reactants and the total mass of the products?
a)
They must be equal.
b)
The mass of the reactants must be greater.
c)
Reactants must be more than the products.
d)
Products must be more than the reactants.
18.
The word equation “Magnesium reacts with chlorine to produce magnesium chloride” would be represented by which of the following formula equations?
a)
Mg + Cl2 --> MgCl2
b)
MgCl2 --> Mg + Cl2
c)
MgCl2 + Mg--> Cl2
d)
Mg --> Cl2 + MgCl2
19.
In a chemical equation, the symbol that takes the place of the word yields is a(n)
a)
arrow
b)
plus sign
c)
equal sign
d)
coefficient
20.
In a chemical equation, the symbol that takes the place of the words reacts with is a(n)
a)
arrow
b)
equal sign
c)
plus sign
d)
coefficients
21.
Which of the following is not an example of a chemical change?
a)
wood burning
b)
boiling water
c)
an apple ripening
d)
rusting iron
22.
In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?
a)
hydrogen only
b)
oxygen only
c)
hydrogen and oxygen
d)
water
23.
A substance that is formed by a chemical reaction is called a
a)
product
b)
reactant
c)
mole
d)
coefficient
24.
A substance that enters into a chemical reaction is called a
a)
product
b)
reactant
c)
coefficient
d)
mole
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