Daily Practice

GCSE Science

27th March 1988

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
Write the word equation for the reaction between zinc and hydrochloric acid.
3
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
4
Electrolysis
Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
5
Energy Changes
State whether the combustion of methane is exothermic or endothermic.

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