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Decomposition Reactions

Chemistry ⇒ Chemical Reactions and Equations

Decomposition Reactions starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Decomposition Reactions. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
A student heats a sample of calcium carbonate and collects the gas evolved. Which gas is most likely to be collected?
Calculate the mass of oxygen produced when 24.5 g of potassium chlorate (KClO3) decomposes completely. (Molar mass of KClO3 = 122.5 g/mol)
Describe the difference between thermal and photochemical decomposition reactions.
Explain why decomposition reactions are generally endothermic.
Explain why silver chloride is stored in dark bottles.
What are the products formed when ferrous sulphate is heated?
Which type of energy is required for the decomposition of calcium carbonate?
Write the balanced chemical equation for the decomposition of ammonium dichromate.
Write the balanced chemical equation for the decomposition of lead(II) nitrate.
Write the balanced chemical equation for the thermal decomposition of potassium chlorate.
Write the balanced equation for the electrolysis of water.
A 10.0 g sample of sodium azide (NaN3) is decomposed by heating in an airbag. Calculate the volume of nitrogen gas produced at STP. (Molar mass of NaN3 = 65.0 g/mol; 1 mol gas at STP = 22.4 L)
A sample of hydrated copper(II) sulfate (CuSO4ยท5H2O) is heated strongly. Write the balanced chemical equation for its decomposition and explain the color change observed during the reaction.
A student observes that the decomposition of a certain compound only occurs when an electric current is passed through it. What type of decomposition reaction is this, and give one example.
Describe the role of energy in the decomposition of silver bromide and explain why this reaction is important in photography.
Explain, with a balanced chemical equation, how the decomposition of ammonium nitrite demonstrates the conservation of mass.