10. Chemistry of the environment
A section of Chemistry, 0620
Listing 10 of 723 questions
The equations A and B below show two reactions which lead to the formation of acid rain. A S + O2 → SO2 B SO2 + O3 → SO3 + O2 Write a word equation for reaction A. Which two of the following statements about reaction B are correct? Tick two boxes. SO2 is oxidised to SO3 SO2 is reduced to SO3 O3 is reduced to O2 O3 is oxidised to O2 Complete the equation to show how an aqueous solution of sulfuric acid, H2SO4, is formed from SO3. SO3 + → H2SO4 Describe and explain the effect of sulfuric acid on buildings made from limestone (calcium carbonate). State one effect of acid rain other than on buildings.
0620_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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The diagram shows the composition of the planet Saturn. liquid hydrogen liquid helium atmosphere rocky core 75.0% hydrogen 24.9% helium 0.1% other gases Describe how Saturn’s atmosphere differs from the Earth’s atmosphere. Give three differences. Some properties of hydrogen and helium are given in the table. element density of the liquid in g / cm3 melting point in °C boiling point in °C hydrogen 0.07 –259 –253 helium 0.15 –272 –269 Use the information to suggest why the layer of liquid hydrogen in Saturn floats on top of the liquid helium. What is the physical state of hydrogen at –250 °C? Explain your answer. The atmosphere of Saturn contains small amounts of ammonia. Describe a test for ammonia. test result Ammonia is a covalent compound. Complete the diagram to show ● the arrangement of electrons in a molecule of ammonia, ● the symbols of the atoms present. Show outer electrons only. Saturn’s atmosphere also contains small amounts of ammonium hydrosulfide. Calculate the relative molecular mass of ammonium hydrosulfide, NH4SH. Use your Periodic Table to help you. relative molecular mass = Saturn’s atmosphere also contains small amounts of methane. Small amounts of methane are present in the Earth’s atmosphere. Methane is a greenhouse gas. Name another greenhouse gas present in the Earth’s atmosphere. Scientists are concerned about the increase in the amount of greenhouse gases in the Earth’s atmosphere. Explain why.
0620_w17_qp_32
THEORY
2017
Paper 3, Variant 2
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Questions Discovered
723