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8E

Key Stage 3 Science

QuestionAnswer
State what occurs in an oxidation reaction and give an example An element joins with oxygen. E.g Magnesium + Oxygen -> Magnesium Oxide
State the law of conservation of mass The mass of all the reactants is equal to the mass of all the products
Write a general word equation for the complete combustion of a hydrocarbon fuel Hydrocarbon + oxygen --> Carbon Dioxide + Water
When investigating the change in mass when magnesium burns why is it important to lift the lid at regular intervals To allow oxygen from the air to react with the magnesium
Explain why the product formed when heating magnesium weighs more than the magnesium did at the start Atoms of of oxygen have joined with the magnesium atoms during the burning of the magnesium
State the three sides of the fire triangle Fuel, oxygen, heat
List three differences between complete and incomplete combustion of a fuel in terms of both the causes and the products • In complete combustion the fuel reacts completely with oxygen, limited amount of oxygen so the fuel only partly reacts with oxygen, the only products are carbond dioxide and water• In incomplete combustion carbon monoxide and carbon are also formed
Name the two gases that cause Acid Rain and list two effects of Acid Rain Sulfur Dioxide and Nitrogen Oxides• Make soil too acidic for plants to grow properly• Harm plants and animals• Damage buildings
What Is a catalytic converter and what is its function It is a device fitted to the exhaust pipe of a vehicle to change harmful pollutant gases into less harmful gases
List three examples of human activities that contribute to climate change • Burning Fossil Fuels • Deforestation • Rearing Cattle
List three effects of climate change • Droughts• Famines • Sea Level Rise leading to flooding• Increased storms and hurricanes
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