Describe each of the following as a physical or chemical property.

1. Apple slices turn brown when exposed to air.

2. At room temperature, mercury is a liquid.

3. Phosphorus will ignite when exposed to air.

4. Neon is a colorless gas at room temperature.

Physical change -

It refers to any change during any process, where there is no new substance is formed, is referred to as a physical change.

Any change in the state of matter is characterised under physical change.

Chemical change -

It refers to any change in a chemical process, where there is formation of any new substance, is referred to as a chemical change.

From the options given in the question,

1. Apple turning brown, on air exposure, is an example of chemical change.

2. The physical state of mercury is liquid, is an example of physical change.

3. phosphorus burns on exposed to air, is an example of chemical change.

4. The gas Neon is colorless at the room temperature, is is an example of physical change.