Q1
1) Rainwater is collected from the roofs of houses as shown in Figure 1.
1.1) The water in the storage tank is not potable.
What does potable mean? [1 mark]
Tick one box.
What does potable mean? [1 mark]
Tick one box.
1.2) Why should the water in the tank be filtered to make it potable? [1 mark]
Tick one box.
Tick one box.
1.3) A gas which bleaches litmus paper can be added to the water to make it potable.
Name this gas and explain why it is added. [2 marks]
The storage tank is made from concrete reinforced with steel wire, as shown in Figure 2.
Name this gas and explain why it is added. [2 marks]
The storage tank is made from concrete reinforced with steel wire, as shown in Figure 2.
Figure 3 shows how the distance between the steel wires affects the relative strength of the concrete.
1.4) Use values from Figure 3 to describe the relationship shown by the graph. [2 marks]
(Total for Question 1 = 6 marks)
(Total for Question 1 = 6 marks)