50 points answer 1 question and provide a souce (1) what is the difference between a physical and a chemical property? describe and provide examples.

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

there is none because earth is stationary and flat.

the ratio of the conjugate base to the acid required to attain the desired ph.