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I It acts as a radiation filter II It traps heat allowing for the heating of the Earth III It acts as a conduit for the movement of matter and energy I only I and II I and III I, II and III Which of the following is a function of the atmosphere? Which of these gases is present in the atmosphere in the greatest abundance? N2 O2 Ar CO2 Chemistry in the stratosphere is dominated by the reactions of which compound? Oxygen Nitrogen Carbon dioxide Ozone Which of the following statements concerning UV radiation is false? UV-C is high energy and germicidal. UV-B is can cause skin cancer. The ozone layer is able to shield the Earth from UV-A radiation. High energy UV radiation can cause oxygen molecules to split into oxygen atoms. CH4 CO2 H2O All of the above Which of the following compounds can be described as a greenhouse gas? Which reaction is the most important process that removes carbon from the atmosphere? Combustion Respiration Photosynthesis Volcanic action Why is nitrogen important to all living creatures? Living creatures need nitrogen to synthesise DNA and proteins. Living creatures need nitrogen to create fats. Nitrogen is essential for the respiratory system. Nitrogen is not important to all living creatures. It has low electronegativity. It tends to form weak bonds with O2, thus shielding it from reacting with other chemicals. Due to its strong triple covalent bond. It is a noble gas. Why is nitrogen gas so unreactive? Oxides of which element contribute to the formation of acid rain? carbon nitrogen sulfur All of the above I H2SO4 II HNO3 III CH3COOH I and II III only I only I, II and III Which acids are involved in acid rain? How have humans contributed to the formation of acid rain? I and II II and III I, II and III I only I Burning sulphur containing fossil fuels II Running internal combustion engines III Running of power plants Which of the following will not reduce the effects of acid rain? Using low sulphur fuels Removing sulphur from coal before combustion Recycling plastics Improve the design of combustion engines CFCs NO2 and SO2 Unburnt hydrocarbons and NOx CO2 Which chemicals are involved in the formation of photochemical smog? Which of the following best describes the enhanced greenhouse effect? Decreased level of ozone in the stratosphere. Formation of harmful brown haze over cities. Increased levels of CO2, CH4 and CFCs in the atmosphere. None of the above. Use of CFC gases which catalyse the destruction of O3 molecules. Combustion of fossil fuels. Combustion of sulphur containing fossil fuels. Unburnt hydrocarbons and NOx from combustion engines. What is the main cause of ozone depletion? NO2 HNO3 NO3 NO Which of the following is the correct formula for nitric acid? HNO3 and NO3- NH3 and NH4+ NO and NO2 NH3 and HNO3 The fertiliser industry uses nitrogen to manufacture which compounds? Complete the formula for ammonium sulphate. (NH ) SO Which chemical process listed below does not always require oxygen? Oxidation Corrosion Respiration Combustion The products of the fermentation process include: I and II II and III I, II and III I only I glucose II ethanol III carbon dioxide Balance the fermentation reaction below. C6H12O6 (aq) → C2H5OH (aq) + CO2 (g) |