Daily Practice

GCSE Science

3rd February 1985

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
2
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
3
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
4
Electrolysis
State the name given to the negative electrode in electrolysis.
5
Energy 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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