1. Module C1 Upgrade: Model answers 6 © Oxford University Press 2011 Sulfur dioxide Higher tier question Click anywhere on this screen to proceed. Navigate using the links at the bottom of every screen.

2. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer Question (part 1) The graph shows how the mass of sulfur dioxide released into the air in the UK has changed from 1970 to 2005.

3. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer Question (part 2) (a)Which of the following statements about the graph are true and which are false? Put a tick after each statement. [2] TrueFalse The amount of sulfur dioxide released into the air has fallen every year since 1970. The amount of sulfur dioxide released per year fell by more than 2/3 between 1970 and 2000. The fastest rate of decrease was between 1985 and 1990. Six million tonnes of sulfur dioxide were released in 1973.

4. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer Question (part 3) (b)Sulfur dioxide is released into the air from power stations and car exhausts. Describe how the amount of sulfur dioxide released by power stations and cars can be reduced. [2]

5. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer Explanation of question True/false questions like (a) are much more difficult than ‘tick box’ questions because you don’t know how many answers are ‘right’. You need to work through every statement carefully. Make sure you say whether each statement is true or false. In (b), make sure you give an answer for both power stations and cars.

6. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer D–C answer (a) comment This answer to (a) gains just one mark. The first row is wrong because there was not a decrease every year, for example in 1978 the total mass increased. NextPrevious. TrueFalse The amount of sulfur dioxide released into the air has fallen every year since 1970. The amount of sulfur dioxide released per year fell by more than 2/3 between 1970 and 2000. The fastest rate of decrease was between 1985 and 1990. Six million tonnes of sulfur dioxide were released in 1973.

7. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer D–C answer (continued) (b)The gases from power stations can be filtered. They can use calcium hydroxide or sea water. comment The candidate has provided detail about ‘scrubbing’ gases from power plants. However, this response only gains one mark because the question also asks about cars. The candidate has not made any suggestions on this topic. NextPrevious.

8. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer B–A* answer (a) comment This answer to (a) gets both marks. Every statement has been read carefully and checked against the graph. NextPrevious. TrueFalse The amount of sulfur dioxide released into the air has fallen every year since 1970. The amount of sulfur dioxide released per year fell by more than 2/3 between 1970 and 2000. The fastest rate of decrease was between 1985 and 1990. Six million tonnes of sulfur dioxide were released in 1973.

9. © Oxford University Press 2011 Module C1 Upgrade: Model answers 6 Question Explanation of question Answer B–A* answer (continued) (b)Taking sulfur dioxide out of the waste gases that come from the power station and by using low sulfur petrol in cars. comment This is a very ‘brief’ answer to (b) but still gets two marks. The answer includes clear statements about how sulfur dioxide can be removed from both cars and power stations. NextPrevious.