Black ice is a thin layer of water on a sidewalk or road that has rozen after the temperature has dropped below freezing its called black ice because the ice-s nearly ms ble especially when driving in a car at night. Which of the following statements is true?

View Available Hint (s)

A) Black ice is neither a chemical change nor a physical change

B) Black ice is an example of a physical change

C) Black ice is an example of a chemical change

D) Black ice is both a chemical change and a physical change

The correct option is B

Explanation:

There are two changes in chemistry; physical and chemical change.

A physical change is generally characterized by the following properties

No new substance is formed They are easily reversible They cannot be represented with a chemical reaction example includes burning of candle wax

A chemical change is generally characterized by the following properties

New substances are formed They are not easily reversible They can be represented with a chemical reaction example includes rusting of iron

The question states that the water on the sidewalk or a road is been converted to ice as a result of a decline in temperature and this can be reversed when the temperature increases. From the properties highlighted earlier, this process is a physical change because of the following reasons

No new substance is formed as water in its solid state is ice This can be easily reversible with a change in temperature This reaction does not require a chemical reaction as it is just water (H2O) in different states (solid and liquid).

Answer: option B. Black ice is an example of a physical change