Page 1 of 16 Q1. Titan is a moon of the planet Saturn. The table below shows the percentages of some gases in the atmosphere of Titan and in the atmosphere of the Earth. Gas Percentage of gas in atmosphere (%) Titan Earth Nitrogen 98 78 Oxygen Zero 21 Methane 1.4 0.0002 Argon 0.14 0.9 Carbon dioxide 0.0001 0.04 (a) Which two gases are present in smaller percentages on the Earth than on
Titan?
________________________________ and _______________________
(1) (b) Complete the bar chart in the figure below to show the percentages of
nitrogen gas and oxygen gas in the Earth ’s atmosphere.AQA Chemistry GCSE - Carbon Dioxide & Methane as Greenhouse Gases Page 2 of 16 (2) (c) Why are algae less likely to photosynthesise on Titan than Earth?
Use the table abov e.
Tick (✓) one box.
Titan ’s atmosphere contains too little argon. Titan ’s atmosphere contains too little carbon dioxide. Titan ’s atmosphere contains too little methane. Titan ’s atmosphere contains too little nitrogen. (1) (d) Titan is warmer than the other moons of Saturn because of the greenhouse
effect.
How do greenhouse gases trap energy from th e sun?
Tick (✓) one box.AQA Chemistry GCSE - Carbon Dioxide & Methane as Greenhouse Gases Page 3 of 16 All wavelengths of radiation are reflected back to the surface of Titan. Long wavelength radiation is reflected back to the surface of Titan. Short wavelength radiation is reflected back to the surface of Titan. (1) As well as methane, the atmosphere of Titan contains small amounts of propene gas. Methane is an alkane and propene is an alkene. (e) Bromine water is an orange solution used to identify alkenes.
Draw one line from eac h gas to its effect on bromine water.
(2) (f) Propene reacts with water (steam) to make propanol.
The ratio of the masses of propene and water that react is:
Propene : water 7 : 3 Calculate the mass of propene that reacts with 21 g water. ___________________________________________________________ AQA Chemistry GCSE - Carbon Dioxide & Methane as Greenhouse Gases
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