QUESTION 2 Water has a high heat of vaporisation value o…

Questions

QUESTION 2 Wаter hаs а high heat оf vapоrisatiоn value of 40,7 kJ.mol-1. 2.1 Identify the attribute of water causing this high heat of vaporisation. (1) 2.2 Discuss the advantage of the resistance mentioned in QUESTION 2.1 for our planet and all living organisms. (3) A water molecule is polar while a carbon dioxide molecule is non- polar. 2.3 What is the difference between a polar and a non- polar molecule? (2) 2.4 What is the name of the shape given to the water molecule? (1) 2.5 Use electronegativity difference to determine the type of bond present in the carbon dioxide molecule. (2) 2.6 What is the easiest way to increase the amount of kinetic energy in a system? (2) 2.7 How does the density of a solid compare to the density of a liquid? Explain your answer in terms of intermolecular forces. (3) 2.8 What are meant by the terms ‘thermal expansion’ and ‘thermal conductivity’? (4) 2.9 What happens to the density of liquid water as the temperature rises? Briefly explain your answer. (3) [21]

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