Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
- 1Moles, Formulae and Equations
Calculate the mass of 0.25 mol of sodium hydroxide, NaOH. (Na = 23, O = 16, H = 1)
- 2Concentration, Yield and Atom Economy
Give the formula for atom economy.
- 3Chemical Changes
State the pH value of a neutral solution.
- 4Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
- 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 July 2013, including the monthly compilation PDF.