Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
29th December 2007
- 1Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
- 2Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
- 3Reactivity, Acids and Salts
Define oxidation in terms of electrons.
- 4Electrolysis
Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
- 5Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
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