A student distils a sample of sea water. Where should the bulb of the thermometer be placed?
In the sea water in the flask, below the surface of the liquid
Inside the condenser, next to the water that has been collected
Touching the inside wall of the flask above the liquid surface
At the entrance to the condenser, level with the side arm
40 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.