Chemical reactions
54 past-paper questions on Chemical reactions · examined 2020–2025.
20255 questions
Sodium is added to water and a chemical reaction occurs. Hydrogen and aqueous sodium hydroxide are produced. Which row describes the reactants and products in this reaction?
Magnesium reacts with aqueous copper(II) sulfate to form copper and aqueous magnesium sulfate. What is the correct equation for this reaction?
16 The equation shows the reversible reaction between nitrogen and hydrogen to form ammonia. N2 + 3H2 2NH3 The forward reaction is exothermic. Which statement is correct when the temperature is increased? A The activation energy increases. B The equilibrium shifts to form more ammonia. C The rate of the forward reaction decreases. D The rate at which ammonia decomposes increases.
Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. What is the correct ionic equation, including state symbols, for this reaction?
Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. What is the correct ionic equation, including state symbols, for this reaction?
20243 questions
X and Y are both elements, one of which is a non-metal. 1 mole of X is added to 1 mole of Y and they are heated together. X and Y react completely to form substance Z. Substance Z cannot be easily separated to form X and Y. Three statements are given. Which statements are correct?
Fe3O4 reacts with concentrated hydrochloric acid. The products are iron(II) chloride, iron(III) chloride and a liquid that turns blue cobalt(II) chloride paper pink. Construct the symbol equation for this reaction.
A student adds large pieces of zinc to dilute hydrochloric acid. The zinc is in excess. Complete the equation by adding state symbols for the products. Zn(s) + 2HCl (aq) ZnCl 2(….) + H2(….)
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