1) Which of the following best describes thermal decomposition reactions? a) When a compound is heated and it breaks down b) When a reaction absorbs energy c) When a fuel reacts with oxygen and releases heat energy 2) How many reactants are there in thermal decomposition reactions? a) Two b) Four c) Three d) One 3) How many products are there in thermal decomposition reactions? a) Always two b) Two or more c) Just one d) Always three 4) What sort of temperatures are needed for thermal decomposition reactions? a) Room temperature b) High temperatures c) Any temperature d) Low temperatures 5) Which word correctly describes thermal decomposition reactions? a) Endothermic b) Combustion c) Oxidation d) Exothermic 6) 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 7) What is the correct symbol equation for the thermal decomposition of copper carbonate? a) CaCO3 → CaO + CO2 b) CuCO3 → CuO + CO2 c) Cu + O2 → CuO 8) What is the correct symbol equation for the thermal decomposition of calcium carbonate? a) CaCO3 → CaO + CO2 b) CaCO3 → CuO + CO2 c) CuCO3 → CuO + CO2 9) Which of the following equations shows the correct state symbols for the thermal decomposition of calcium carbonate? a) CaCO3s → CaOg + CO2g b) CaCO3s → CaOs+ CO2g c) CaCO3s → CaOl + CO2g

Thermal decomposition

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