Daily Practice

GCSE Science

20th August 1981

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
Calculate the number of moles in 88 g of carbon dioxide. (Mr = 44)
2
Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
3
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
4
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
5
Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.

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