Daily Practice · GCSE Science

Daily Practice - GCSE Science

Biology, chemistry and physics recall, definition and calculation, drawn from every strand.

21st July 2021

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
A student reacts 2.4 g of magnesium with excess dilute hydrochloric acid: Mg + 2HCl -> MgCl2 + H2. Relative atomic mass of Mg = 24. Calculate the number of moles of hydrogen gas produced.
2
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
3
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
4
Energy Changes
A reaction profile shows the reactants at 220 kJ and the products at 340 kJ. State whether the reaction is exothermic or endothermic.
5
Exothermic and Endothermic Reactions
State what is meant by the activation energy of a reaction.

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