WorksheetsCalculation Revision
Total questions: 6
Worksheet time: 3mins
Name
Class
Date
1.
How many oxygens are in CaCO3
a)
1
b)
2
c)
3
d)
4
2.
What is the relative formula mass of HNO3. Mass of N=14 H=1 O=16
a)
75
b)
63
c)
120
d)
100
3.
What is the percentage by mass of Hydrogen in H2O? Mass of H=1 O=16 RFM = 18
a)
11%
b)
30%
c)
50%
d)
75%
4.
A student dissolves 20g of potassium chloride in 100cm³ of water in a beaker. What is the concentration of the solution in g/dm³?
a)
100
b)
0.2
c)
200
d)
10
5.
10.0 g of calcium carbonate, CaCO3, was heated . 5.60 g of solid remained after heating. The equation below represents the reaction:
CaCO3(s) → CaO(s) + CO2(g)
Explain the change in mass.
a)
mass decreased as a gas was produced
b)
mass decreased as the substance reacted with a gas
c)
mass increased as a gas was produced
d)
mass increased as the substance reacted with a gas
6.
Calculate the uncertainty in the table
a)
55
b)
27.5
c)
45
d)
22.5
100 %
