Ch5_WS1
1
Cambridge International AS and A Level Chemistry Original material © Cambridge University Press 2011 1 Worksheet 5.1 Kinetic theory and the general gas equation 1 a Describe the changes that occur in the closeness and motion of the particles when: i a gas changes to a liquid [4] ii a solid changes to a liquid. [4] b State the name given to each of the changes in part a. [2] c What energy change occurs when: i a gas changes to a liquid? [1] ii a liquid changes to a gas at a temperature below the boiling point of the liquid? [1] 2 a Under what conditions do the properties of an ideal gas differ from those of a real gas? [2] b For the conditions you stated in part a, explain how an ideal gas would behave. [4] c Explain why the properties of ideal gases differ from those of real gases. [5] In questions 3 and 4 you will need to use the gas constant, R. You will find this value in Data sheet 1. 3 The relative molecular mass of a volatile liquid can be found by vaporising the liquid in a gas syringe. 0.0750 g of a hydrocarbon vapour occupies 25.0 cm 3 at 77.0 °C. Atmospheric pressure is 101.3 kPa. a What is the value of the temperature in kelvins? [1] b What is the atmospheric pressure in pascals? [1] c What is the volume of the hydrocarbon vapour in m 3 ? [1] d Use the general gas equation to calculate the relative molecular mass of the hydrocarbon. [3] 4 A hydrocarbon with relative molecular mass 58.0 exists as a vapour at 100 °C and atmospheric pressure 101 kPa. Under these conditions, 0.100 g of this hydrocarbon was present as vapour. a Calculate the number of moles of the hydrocarbon. Give your answer to 3 significant figures. [1] b What is the value of the temperature in kelvins? [1] c What is the atmospheric pressure in pascals? [1] d What volume, in cm 3 , does this hydrocarbon occupy under these conditions? [4]
description
KINETIC ENERGY AND GASES
Transcript of Ch5_WS1
Cambridge International AS and A Level Chemistry Original material © Cambridge University Press 2011 1
Worksheet 5.1
Kinetic theory and the general gas equation
1 a Describe the changes that occur in the closeness and motion of the particles when: i a gas changes to a liquid [4] ii a solid changes to a liquid. [4]
b State the name given to each of the changes in part a. [2] c What energy change occurs when:
i a gas changes to a liquid? [1] ii a liquid changes to a gas at a temperature below the boiling point of the liquid? [1]
2 a Under what conditions do the properties of an ideal gas differ from those of a real gas? [2] b For the conditions you stated in part a, explain how an ideal gas would behave. [4] c Explain why the properties of ideal gases differ from those of real gases. [5]
In questions 3 and 4 you will need to use the gas constant, R. You will find this value in Data sheet 1.
3 The relative molecular mass of a volatile liquid can be found by vaporising the liquid in a gas syringe. 0.0750 g of a hydrocarbon vapour occupies 25.0 cm 3 at 77.0 °C. Atmospheric pressure is 101.3 kPa. a What is the value of the temperature in kelvins? [1] b What is the atmospheric pressure in pascals? [1] c What is the volume of the hydrocarbon vapour in m 3 ? [1] d Use the general gas equation to calculate the relative molecular mass of the hydrocarbon. [3]
4 A hydrocarbon with relative molecular mass 58.0 exists as a vapour at 100 °C and atmospheric pressure 101 kPa. Under these conditions, 0.100 g of this hydrocarbon was present as vapour. a Calculate the number of moles of the hydrocarbon. Give your answer to 3 significant
figures. [1] b What is the value of the temperature in kelvins? [1] c What is the atmospheric pressure in pascals? [1] d What volume, in cm 3 , does this hydrocarbon occupy under these conditions? [4]
