Classify the following as a physical change or chemical change. Column A
1.
Chopping wood:
Chopping wood
2.
Burning Wood:
Burning Wood
3.
Ice cube melting:
Ice cube melting
4.
Steam from a shower:
Steam from a shower
5.
A bike rusting:
A bike rusting
Column B
a. Physical Change
b. Chemical Change

neither accurate nor precise.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me