Question

1) Identify the following as physical or chemical changes:

i) Metal cap of a jam bottle loosens when heated

ii) Sugar is heated strongly

2) You are at the starting post of a 100m race and hear the pistol shot.

i) What would you do?
ii) Identify the stimulus and response.

3) Name the appropriate unit for measuring the following.

i) The length of a pencil
ii) The distance between stars​

Answer 1

Answer:

i)chem change

ii)chem change

iii)physical change

Explanation: