Chemistry 9701/53 — October/November 2012
Cambridge A-Level · Planning, Analysis and Evaluation · worked solutions for every part, with the mark scheme
Topics Analysis, Conclusions and Evaluation · Planning
The particles of a gas are considered to be in constant random motion. For a fixed mass of gas in a container, the particles collide with the container walls and it is these collisions that are responsible for the pressure exerted by the gas.
The more frequent the collisions, the greater the pressure. If the temperature is kept constant, the average kinetic energy of the gas remains constant. A temperature increase means an increase in this average kinetic energy.
Predict how the pressure of a fixed mass of gas held at a constant temperature varies as the volume of the gas decreases. Explain this prediction in terms of the frequency of the gas collisions with the container walls.
Predict how the pressure will change:
Explanation:
Display your prediction in the form of a sketch graph, labelling clearly the axes.
Sketch a second graph showing how your projected relationship will change if the temperature of the fixed mass of gas is increased. Label this second graph clearly.
If you were to carry out an experiment to investigate how the pressure of a fixed mass of gas varies as the volume decreases, name
the independent variable
the dependent variable
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