Daily Practice

GCSE Science

10th February 1991

5 questions · GCSE · 584 questions in this band

1
Reactivity, Acids and Salts
State what is observed when magnesium ribbon is added to copper sulfate solution.
2
Electrolysis
Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
3
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.
4
Exothermic and Endothermic Reactions
On a reaction profile diagram, the reactants are drawn at a higher energy level than the products. State whether the reaction is exothermic or endothermic.
5
Bond Energies, Cells and Fuel Cells
State the difference between a rechargeable cell and a non-rechargeable cell.

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