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1.2. Diffusion
A subsection of Chemistry, 0620, through 1. States of matter
Listing 10 of 34 questions
The Kinetic Theory explains the properties of matter in terms of the arrangement and movement of particles. Nitrogen is a gas at room temperature. Nitrogen molecules, N2, which are spread far apart move in a random manner at high speed. Draw a diagram showing the arrangement of the valency electrons in a nitrogen molecule. Use × to represent an electron from a nitrogen atom. How does the movement and arrangement of the molecules in a crystal of nitrogen differ from those in gaseous nitrogen? Use the ideas of the Kinetic Theory to explain the following. A sealed container contains nitrogen gas. The pressure of a gas is due to the molecules of the gas hitting the walls of the container. Explain why the pressure inside the container increases when the temperature is increased. The following apparatus can be used to measure the rate of diffusion of a gas. constant pressure applied gas syringe gas metal foil gas escapes through small hole in foil The following results were obtained. gas temperature / °C rate of diffusion in cm3 / min nitrogen 1.00 chlorine 0.63 nitrogen 1.05 Explain why nitrogen diffuses faster than chlorine. Explain why the nitrogen diffuses faster at the higher temperature.
0620_w10_qp_33
THEORY
2010
Paper 3, Variant 3
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A small amount of liquid bromine is added to a container which is then sealed. Br2→ Br2Use the ideas of the Kinetic Theory to explain why, after about an hour, the bromine molecules have spread uniformly to occupy the whole container. The diagrams below show simple experiments on the speed of diffusion of gases. diagram 1 diagram 2 porous pot allows gas molecules to diffuse air porous pot air air hydrogen large beaker large beaker carbon dioxide same level coloured liquid higher level diagram 3 higher level air
0620_w12_qp_33
THEORY
2012
Paper 3, Variant 3
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Questions Discovered
34