A greenhouse gas absorbs radiation emitted by the Earth's surface and then emits radiation of its own. Which statement about the radiation that the gas emits is correct?
It travels only upwards, out into space and away from the Earth
It travels in all directions, so none of it reaches the surface
It has a very much shorter wavelength than the radiation absorbed
It travels in all directions, so some of it reaches the surface
40 exam-style questions on AQA GCSE Chemistry 9.2 Carbon dioxide and methane as greenhouse gases, covering 9.2.1 Greenhouse gases, 9.2.2 Human activities which contribute to an increase in greenhouse gases in the, 9.2.3 Global climate change, and 9.2.4 The carbon footprint and its reduction. Each one has a worked solution and a mark scheme showing where the marks go.