Daily Practice · GCSE Science

Daily Practice - GCSE Science

Biology, chemistry and physics recall, definition and calculation, drawn from every strand.

20th January 2014

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Why do companies prefer reactions with a high atom economy?
2
Chemical Changes
State the pH value of a neutral solution.
3
Reactivity, Acids and Salts
State what is observed when magnesium ribbon is added to copper sulfate solution.
4
Electrolysis
Molten zinc chloride, ZnCl2, is electrolysed using inert electrodes. Write the half equation for the reaction at (a) the cathode, and (b) the anode.
5
Energy Changes
Using the values in the previous question, calculate the overall energy change for the reaction.

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