In a paper chromatography chamber, which example could be the stationary phase?
air
plastic plate
paper

Paper  

Explanation:

Paper chromatography is a method of separating mixtures of coloured substances into their components.

It uses a stationary phase and a mobile phase.

A tiny drop of a solution of the mixture is applied to the paper, which is suspended in a solvent.

The solvent flows through the paper and carries the components of the mixture with it.

Different components travel at different rates, so the mixture separates into different coloured spots as the solvent front moves up the paper.

The solvent moves up the paper, so it is the mobile phase.

The paper does not move, so it is the stationary phase.

the answer is b & c i believe : )

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds