1) What the definition for an exothermic reaction a) A reaction that gains energy from the surroundings b) A reaction that releases gas to the surroundings c) A reaction that produced carbon dioxide d) A reaction that releases energy to the surroundings 2) What's the definition of a endothermic reaction a) A reaction that releases energy to the surroundings b) A reaction that takes in energy from the surroundings c) A reaction that causes fire d) A reaction that has no energy 3) What is thermal decomposition? a) Breaking down with heat b) when heat energy is given out c) when something catches fire 4) What sort of temperatures are needed for thermal decomposition reactions? a) Any temperature b) room temperature c) low temperatures d) high temperatures 5) How many reactants are there in a thermal decomposition? a) 1 b) 2 c) 3 d) 4 6) How many products are there in a thermal decomposition? a) Two or more b) Always three c) Always 2 d) Just one 7) What is the correct word equation for the thermal decomposition of copper carbonate? a) copper oxide + carbon dioxide --> copper carbonate b) copper carbonate --> copper oxide + carbon dioxide 8) What colour change occurs when copper carbonate is heated? a) stays white b) white to colourless c) green to black d) black to green 9) ZnCO3 → ????? + CO2 a) ZnO2 b) ZNO c) ZnO d) ZnCO 10) What colour change happens to limewater during thermal decomposition of carbonates? a) white to colourless b) green to black c) colourless to milky d) milky to colourless 11) What gas made the limewater go milky? a) carbon monoxide b) carbon dioxide c) hydrogen d) Calcium chloride

Thermal decomposition

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