Decomposition Reactions
Chemistry ⇒ Chemical Reactions and Equations
Decomposition Reactions starts at 9 and continues till grade 12.
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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?
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?
A student heats a sample of calcium carbonate and collects the gas evolved. Which gas is most likely to be collected?
A white powder turns yellow on heating and returns to white on cooling. The powder is most likely:
(1) Lead nitrate
(2) Zinc oxide
(3) Calcium carbonate
(4) Potassium chlorate
Calculate the mass of oxygen produced when 24.5 g of potassium chlorate (KClO3) decomposes completely. (Molar mass of KClO3 = 122.5 g/mol)
A white powder turns yellow on heating and returns to white on cooling. The powder is most likely:
(1) Lead nitrate
(2) Zinc oxide
(3) Calcium carbonate
(4) Potassium chlorate
Decomposition of hydrogen peroxide is catalyzed by:
(1) Manganese dioxide
(2) Copper sulphate
(3) Sodium chloride
(4) Zinc oxide
Decomposition reactions always result in:
(1) Formation of a single product
(2) Formation of two or more products
(3) Absorption of energy only
(4) Release of energy only
Which of the following compounds decomposes on heating to give oxygen gas?
(1) Sodium chloride
(2) Potassium chlorate
(3) Calcium sulphate
(4) Sodium carbonate
Decomposition reactions are generally _______ (endothermic/exothermic) in nature.
Fill in the blank: The decomposition of ammonium nitrate produces nitrous oxide and _______.
Fill in the blank: The decomposition of lead(IV) oxide produces lead(II) oxide and _______.
Fill in the blank: The decomposition of sodium nitrate produces sodium nitrite and _______.
State whether the following statement is true or false: Decomposition reactions can be used to extract metals from their compounds.
State whether the following statement is true or false: Electrolysis of water is a decomposition reaction.
State whether the following statement is true or false: The decomposition of sodium bicarbonate produces sodium carbonate, carbon dioxide, and water.
True or False: All decomposition reactions require heat to proceed.
