WorksheetsChemical Reaction
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
2.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
3.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
4.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
5.
Balance this equation, Al2O3 ---> Al + O2
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2
c)
2Al2O3 ---> 4Al + 3O2
d)
3Al2O3 ---> 2Al + O2
6.
name this reaction, Ca + O --> CaO
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
7.
Name this reaction, Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
8.
Predict this reaction, K2O + H2O --> ?
a)
KO2 + H2O
b)
KH2O
c)
K2OH2O
d)
2KOH
9.
Predict this reaction, BeO + CO2 --> ?
a)
BeCO3
b)
2BeCO3
c)
Be +CO3
d)
BeOCO2
10.
Name this reaction, CO2 + H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
11.
Predict this reaction, 2RbCl + 3O2 --> ?
a)
Cl2 + 2RbO
b)
2RbClO3
c)
2Rb + ClO3
d)
3RbClO2
12.
Write a balanced reaction of, Magnesium burns....
a)
2Mg + 3O2 --> 3MgO
b)
Mg + H2O -- MgH
c)
2Mg + CO2 -- MgCO2
d)
2Mg + O2 --> 2MgO
13.
Predict this reaction, Ba(OH)2 --> ?
a)
H2O +2Ba
b)
Ba + OH
c)
BaO + H2O
d)
OH + 4Ba
14.
Decomposition of an oxyacid produces a ...
a)
non-metal oxide and hydrogen
b)
non-metal oxide and water
c)
water and hydrongen
d)
carbon dioxide and water
15.
Synthesis of a metal oxide and carbon dioxide produce
a)
a carbonate
b)
a metal oxide and carbon
c)
a carbon and oxygen
d)
a metal carbonate
16.
Predict this reaction, I2 + CuCl --> ?
a)
Cl2 + CuI
b)
I2 CuCl
c)
no reaction
d)
ICl + Cu
17.
Predict this reaction, Ca + 2HCl --> ?
a)
4CaCl3 + H2
b)
no reaction
c)
CaH2 + Cl
d)
CaCl2 + H2
18.
Replacement of a hydrogen in water by a group 2 metal produces.....
a)
no reaction
b)
a metal oxide and H2
c)
a metal hydrogen and O2
d)
Oxygen and Hydrogen
19.
What does the (aq) stand for in NaCl (aq)?
a)
solid
b)
aqueous
c)
liquid
d)
gas
20.
What does the (s) stand for in MgCO3 (s)
a)
soluble
b)
salty
c)
insoluble
d)
gas
21.
Predict this reaction, HCl (aq) + RbOH (aq) --> ?
a)
RbCl (aq) + H2O (l)
b)
RbCl (l) + H2O (aq)
c)
no reaction
d)
2RbCl (s) + H2O (g)
22.
An element not in a compound has an oxidation number of ....
a)
1
b)
0
c)
no answer
d)
2
23.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
24.
Reduction means to ....
a)
reduce electrons
b)
reduce numbers
c)
gain electons
d)
be a reducing agent
25.
Heating up two reactants will make the reaction...
a)
stay the same
b)
go slower
c)
become constant
d)
go faster
100 %
