Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
3rd December 2009
- 1Moles, Formulae and Equations
Calculate the number of moles in 88 g of carbon dioxide. (Mr = 44)
- 2Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
- 3Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 4Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
- 5Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
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Every sheet is deterministic: the same date always regenerates the same five questions. All of December 2009, including the monthly compilation PDF.