Daily Practice
GCSE Science
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9th March 1970
- 1Moles, Formulae and Equations
How many atoms are there in 0.5 mol of helium?
- 2Concentration, Yield and Atom Economy
Convert 250 cubic centimetres into cubic decimetres.
- 3Chemical Changes
Write the word equation for the reaction between zinc and hydrochloric acid.
- 4Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
- 5Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
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