Download Formulae, Equations Homework

National Chemistry Topic 4
Formulae, Equations, Balancing Equations and the Mole
Homework 1
1. For each of the molecules shown below write the chemical formula:
b)
a)
2. Name the elements present in the following compounds:
a) Lead nitrate
b) Copper sulphate
c) Sodium carbonate
d) Iron sulphide
e) Potassium hydroxide
3. Using the valency rules, write the chemical formula for the following
compounds:
a) Calcium chloride
b) Potassium bromide
c) Sodium sulphide
d) Calcium oxide
e) Aluminium oxide
4. Using valency rules and taking careful note of the roman numerals, write
the chemical formula for the following compounds:
a) Copper(II)oxide
b) Iron(III)chloride
c) Silver(I)iodide
(15)
Homework 2
1.The following compounds have prefixes in their names. Work out their formula
from their names, do not use valency rules:
a) Carbon tetrachloride
b) Phosphorous pentafluoride
c) Sulphur monochloride
d) Diphosphorous trioxide
2. Using the table of complex ions (databooklet page 4), work out the formula of
the following compounds:
a) Sodium sulphate
b) Magnesium nitrate
c) Calcium hydroxide
d) Aluminium phosphate
3. Work out the ionic formula for the following substances:
a) Calcium oxide
b) Potassium chloride
c) Copper(II)sulphate
d) Sodium hydroxide
(12)
Homework 3
1.Read the following sentences describing a chemical reaction and change them
into word equations:
a) When hydrogen sulphide is burned in oxygen the poisonous gas sulphur
dioxide is produced as well as water.
b) Iron can be made by heating iron oxide with carbon monoxide in a blast
furnace. Carbon dioxide gas is also produced .
2. Change the following word equations into formula equations. You don’t need to
balance the equations:
a) hydrogen
+
oxygen
hydrogen oxide
b) aluminium
+
chlorine
aluminium chloride
c) lithium
+
water
d) copper(II)oxide +
lithium hydroxide +
carbon
copper
hydrogen
+
carbon dioxide
3. Balance the following equations:
a) N2
+
O2
NO
b) C2H6
+
O2
CO2
c) Na
+
H2O
NaOH
HCl
CaCl2 +
d) Ca(OH)2 +
+
H2O
+
H2
H2O
(10)
Homework 4
1. Work out the formula mass of the following substances. You will need to
use page 4 of the data book to help you.
a) Na2O
b) KNO3
c) H2O
d) Ca(OH)2
2. Calculate the mass of each of the following substances:
a) 1 mole of sulphur dioxide, SO2
b) 4 moles of fluorine, F2
c) 0∙25 moles of Ca3(PO4)2
3. Calculate the number of moles of the following substances:
a) 9g of water, H2O
b) 500g of calcium carbonate, CaCO3
c) 40g of methane, CH4
(10)
Homework 5
1. What are the units of concentration?
2. How many moles of substance have been dissolved to make the following
solutions?
a) 200 cm3 of a potassium hydroxide solution with a concentration of 0∙5
mol/l.
b) 2 litres of a copper (II)sulphate solution with a concentration of 0∙25
mol/l.
3. What are the concentrations of the following solutions?
a) 500 cm3 of a solution of sodium chloride containing 2∙0 moles.
b) 250 cm3 of a solution containing 0∙5 moles.
4. What volume of the following solutions would contain 0∙25 moles?
a) 2∙0 mol/l hydrochloric acid
b) 3∙0 mol/l potassium nitrate
c) 0∙5 mol/l calcium chloride
5. What is the concentration of a solution containing 2∙9g of potassium
fluoride in 200 cm3 of solution?
(hint – you will need to use both
triangles)
(10)