Question

Describe each of the following as a physical or chemical property. a. Neon is a colorless gas at room temperature.b. Apple slices turn brown when exposed to air. c. Phosphorus will ignite when exposed to air. d. At room temperature, mercury is a liquid.

Answer 1

Answer: Neon is a colorless gas at room temperature: Physical property

At room temperature, mercury is a liquid: Physical property

Apple slices turn brown when exposed to air: Chemical property

Phosphorus will ignite when exposed to air: Chemical property

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical change in which there is alteration in shape, size etc. No new substance gets formed during physical change.

Example:  Neon is a colorless gas at room temperature

At room temperature, mercury is a liquid.

Chemical property is defined as the property of a substance which becomes evident during chemical change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Apple slices turn brown when exposed to air: It undergoes oxidation which is a chemical change

Phosphorus will ignite when exposed to air: It undergoes oxidation which is a chemical change

Answer 2

Answer:

a) Physical property

b) chemical property

c)  chemical property.

d) Physical property

Explanation:

• The Physical property of a substance is the property that are exhibited by the substance without changing its fundamental identity at the molecular level.

• It includes the mechanical properties, visual appearance, electrical properties and thermal properties. Such changes can easily be reverted.The chemical properties involve a change at the fundamental molecular level. It is non reversible and leads to the formation of new molecule.

a) Neon is a colorless gas at room temperature due to its physical property

b) apple slice turns brown due to oxidation in the air this happens due to chemical reaction and it is due to the chemical property of the substance present in apple.

c) Phosphorous when ignites on exposure to air forms a new substance which can't be revered back to phosphorous and has undergone a chemical change due to its chemical property.

d) At room temperature the mercury is liquid represents its physical property because it still remains mercury by its molecular composition.