NEW
Font size
S
M
L
XL
WorksheetsCh. 7 Review
Total questions: 22
Worksheet time: 13mins
Name
Class
Date
1.
All of the following factors may speed up a chemical reaction except
a)
smaller surface area
b)
higher pressure
c)
higher temperature
d)
presence of a catalyst
2.
Which of these is not a sign of a chemical reaction?
a)
A gas is given off
b)
the material dissolves
c)
heat is released
d)
a color change
3.
The substance that is formed in a chemical reaction is called the
a)
polymer
b)
reactant
c)
radical
d)
product
4.
Which of the following stores chemical energy?
a)
the temperature of a substance
b)
the density of a substance
c)
the bonds of a molecule
d)
the nucleus of an atom
5.
Which of the following occurs in an endothermic reaction but not in an exothermic reaction?
a)
chemical bonds are broken
b)
energy is absorbed
c)
molecules are formed
d)
atoms are rearranged
6.
A type of reaction that produces an increase in temperature is
a)
endothermic
b)
exothermic
c)
covalent
d)
nonpolar
7.
In a balanced chemical equation, the mass of the reactants is equal to the
a)
atoms in a molecule
b)
atomic mass of the elements
c)
volume of the reactants
d)
mass of the products
8.
What coefficient is missing in N2 + ?H2 -> 2NH3?
a)
2
b)
3
c)
4
d)
5
9.
Which of the following represents the word equation magnesium + oxygen -> magnesium oxide?
a)
CH4+ O2 -> CH4O2
b)
MgO + O -> MgO2
c)
2Mg + O2 -> 2MgO
d)
2CH4 + O2 -> 2CH3OH
10.
Which of the following equations is not balanced?
a)
Fe + S-> FeS
b)
KOH + HCl -> KCl + H2O
c)
2Mg + O2 -> 2MgO
d)
NaCl + H2SO4 -> Na2SO4 + HCl
11.
Which of the following represents a double-displacement reaction between sodium chloride and silver fluoride?
a)
NaCl + AgF -> NaAgF + Cl2
b)
NaCl + AgF -> NaF + AgCl
c)
NaCl + AgF -> Ag + NaClF
d)
NaCl + AgF -> NaF + Cl2 + Ag
12.
A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce
a)
Mg2
b)
O4
c)
MgO
d)
MgCO2
13.
At higher temperatures, food cooks faster because particles of food
a)
takes up less space
b)
increase in number
c)
collide more often
d)
come into contact with water
14.
A substance that undergoes a change in a chemical reaction is
a)
a product
b)
a chemical
c)
a reactant
d)
an enzyme
15.
The product of the synthesis reaction between sodium and chlorine gas is
a)
polyethylene
b)
carbon dioxide
c)
sodium chloride
d)
copper (II) chloride
16.
A chemical equation is balanced by changing or adding
a)
chemical symbols
b)
subscripts
c)
coefficients
d)
reactants
17.
What happens in a chemical reaction?
a)
atoms are destroyed
b)
atoms are created
c)
atoms are heated and cooled
d)
atoms are rearranged
18.
What type of reaction is shown:
CH4 + 2O2 -> CO2 + 2H2O
CH4 + 2O2 -> CO2 + 2H2O
a)
synthesis
b)
combustion
c)
decomposition
d)
single displacement
19.
What type of reaction is shown?
2NH3 -> N2 + 3H2
2NH3 -> N2 + 3H2
a)
synthesis
b)
double displacement
c)
single displacement
d)
decomposition
20.
What type of reaction is shown?
2NaCl + H2SO4 -> Na2SO4 + 2HCl
2NaCl + H2SO4 -> Na2SO4 + 2HCl
a)
single displacement
b)
synthesis
c)
double displacement
d)
decomposition
21.
What type of reaction is shown?
Fe + S -> FeS
Fe + S -> FeS
a)
synthesis
b)
single displacement
c)
combustion
d)
acid-base reaction
22.
What type of reaction is shown?
2Li + 2H2O -> 2LiOH + H2
2Li + 2H2O -> 2LiOH + H2
a)
synthesis
b)
decomposition
c)
double displacement
d)
single displacement
Reset
