Daily Practice

GCSE Science

22nd October 1989

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
State the pH value of a neutral solution.
3
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
4
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
5
Energy Changes
Using the values in the previous question, calculate the overall energy change for the reaction.

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