Daily Practice · GCSE Science

Daily Practice - GCSE Science

16th October 1994

5 questions · GCSE · 584 questions in this band

1
Quantitative Chemistry
Calculate the number of moles in 20 g of calcium carbonate. (Mr = 100)
2
Moles, Formulae and Equations
State the value of the Avogadro constant and what it counts.
3
Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
4
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
5
Reactivity, Acids and Salts
Define oxidation in terms of electrons.

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