Please do not skip any step solution, and please write the solution step on one piece of paper without use type by using the computer. This is because I scare I will not understand the concept. Thank you very much.

Please answer all the questions. Question 1 (7 marks) (a) Identify the following as a physical change or chemical change of matter. Apple slices turn brown after being cut. Making ice-cream using liquid nitrogen Paper turns to charcoal after being burnt [3 marks] (b) Identify the following types of matters as a heterogeneous mixture, homogeneous mixture, compound or element. Drinking water Air Chlorine gas Sand [4 marks]