1. States of matter
A section of Chemistry, 0620
Listing 10 of 212 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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Dust particles in the air move around in a random way. What term describes the random movement of the dust particles? Identify the particles in the air which cause the random movement of the dust particles. Explain why the dust particles move in this way. When chlorine gas, Cl 2, is put into a gas jar, it spreads out to fill the gas jar. When bromine gas, Br2, is put into a gas jar, it also spreads out to fill the gas jar. The process takes longer for brominegas than for chlorinegas. start later gas gas jar What term describes the way that the gas particles spread out? Use data from the Periodic Table to explain why bromine gas takes longer to fill a gasjar than chlorine gas. Explain why increasing the temperature increases the rate at which the gas particles spread out.
0620_w17_qp_42
THEORY
2017
Paper 4, Variant 2
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Questions Discovered
212