Name:
Class:
Due:
S2 Chemistry-Core
“Chemical Reactions” homework
1. Which of the following is an example of a chemical reaction?
A
B
C
D
Petrol burning
Nail varnish drying
An ice cube melting
Sugar dissolving in tea
(1)
2. Identify the change that is not a chemical reaction.
A
B
A cake baking
C
D
Water boiling
3.
Wood burning
Striking a match
(1)
When potassium carbonate solution and copper nitrate solution are mixed, a
chemical reaction takes place.
(a) What sign is there that a chemical reaction has taken place?
(1)
(b) How could the solid be separated from the solution?
(1)
4.
Coal is a fossil fuel which burns, releasing heat energy.
What name is given to all chemical reactions which release heat energy?
(1)
5. One of the products of the reaction between sulphuric acid and copper oxide is
copper sulphate. The other product is water.
The word equation for the reaction is
A
copper sulphate + copper oxide → sulphuric acid + water
B
copper sulphate + water → sulphuric acid + copper oxide
C
sulphuric acid + copper sulphate → copper oxide + water
D
sulphuric acid + copper oxide → copper sulphate + water
(1)
6. Carbon dioxide gas can be used in fire extinguishers.
A student set up the following experiment to show that carbon dioxide gas can
put out a flame.
Complete the word equation to show the reactants and the third product.
(1)
7. Butane is a hydrocarbon which can be used as a fuel.
When butane burns in oxygen, carbon dioxide and water are produced.
Write a word equation for the burning of butane.
(1)
8. In the 1920s bicycle lamps were powered by burning acetylene gas.
A student made acetylene and burned it.
(a)
How would the student know that a chemical reaction had taken place?
(1)
(b)
Calcium hydroxide solution is also produced when acetylene gas is made.
Complete the word equation for this reaction.
(1)
Score:
/10