1.

(a)

(i) State two differences between heat and temperature. (ii) Expressthe unit of heat in SI base units.

(b)	A scientist in a local university has just proposed a new temperature scale called the Xanthine temperature scale. On the Xanthine scale, water boils at -15.0 X and freezes at - 80 X.Determine the temperature of 300 K on the Xanthine scale

c)	Estimatethe minimum amount of energy, in kJ, required to completely melt 250 g of nickel at room temperature.

d)	At sea level, the temperature and pressure of a weather balloon is 30oC and 100kPa, respectively. As the balloon reaches a certain height, the pressure decreases to90 kPa. What is the temperature at this height? State any assumption that you need to make to solve this problem.