Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
14th December 2003
- 1Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
- 2Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
- 3Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
- 4Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 5Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
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Every sheet is deterministic: the same date always regenerates the same five questions. All of December 2003, including the monthly compilation PDF.