C: pressure
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The diagram shows an apparatus used to compare rates of diffusion. At which labelled position did a white deposit of …
The combustion of methane is exothermic. The equation is given below. CH4 + 2O2 → CO2 + 2H2O What can be deduced from…
How does a catalyst increase the speed of a reaction?
The table contains information about the physical properties of the elements chlorine, copper and iron. In the table …
Petroleum is separated into fractions by fractional distillation. Which fraction distils off at the highest temperature?
Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode (positive e…