Question

Give reason for the following:
a)
Some of the metals surfaces has luster while other are not
b)
Stone sinks in water whereas piece of chalk floats.​

Answer 1

Answer:

Stone is transparent, while glass is opaque.

A notebook has luster, while eraser does not.

Chalk dissolves in water.

A piece of wood floats on water.

Oil mixes with water.

Sand settles down in the water.

Vinegar dissolves in water.

..

Answer 2

Explanation:

1 Because metals are lustrous

2 When the buoyancy forces are balanced, the object floats. The buoyancy force of a stone is much smaller than it's gravity force which is a why stone sinks in water

A piece of chalk will also not flow on water