Daily Practice

GCSE Science

4th September 1989

5 questions · GCSE · 584 questions in this band

1
Bond Energies, Cells and Fuel Cells
State the only substance produced when a hydrogen fuel cell reacts pure hydrogen with pure oxygen.
2
Rate and Extent of Chemical Change
A reaction between calcium carbonate and hydrochloric acid produces 72 cm3 of carbon dioxide gas in 30 seconds. Calculate the mean rate of reaction.
3
Rates of Reaction
In the gas-volume required practical measuring how concentration affects rate, state one variable that should be controlled.
4
Reversible Reactions and Equilibrium
State what is meant by dynamic equilibrium.
5
Organic Chemistry
State what happens to the boiling point of hydrocarbons as their chain length increases.

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