10. Explain the following statements: a) Viscosity of a liquid decrease with increasing temperature. (2 marks) b) Ice less dense than water. (3 marks) 11. A closed container was filled with 6.0L volume of gas. Indicate the changes in pressure when the volume undergoes the following changes at constant temperature and amount of gas (show the derivation). a) The volume is compressed to 2.5L (3 marks) b) The volume expands to 12L