Daily Practice · GCSE Science

Daily Practice - GCSE Science

23rd January 1995

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
2
Reactivity, Acids and Salts
Give the ionic equation for neutralisation.
3
Electrolysis
Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
4
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
5
Exothermic and Endothermic Reactions
A student reacts excess zinc powder with 25 cm3 of copper sulfate solution in a polystyrene cup. The starting temperature is 21.0 degrees C and the maximum temperature reached is 58.5 degrees C. Calculate the temperature change.

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