Which one of the following is a chemical change? a. cutting a bar of sodium metal into pieces with a knife b. lard when heated changes to liquid c. a freshly cut apple turns brown d. mixing sugar and cinnamon e. water disappears from a beaker in a few days at room temperature

Option (C) is the correct answer.

Explanation:

A change is which leads to change in chemical composition of the substance is known as a chemical change.

For example, a freshly cut apple turns brown this is because an oxidation reaction has occurred due to which there occurs change in chemical composition of the apple.

Whereas a change which which does not lead to any change in chemical composition of a substance is known as a physical change.

For example, cutting a bar of sodium metal into pieces with a knife doesn't changes its chemical composition because cutting it into two halves will only change its size.

Thus, we can conclude that out of the given options a freshly cut apple turns brown is a chemical change.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.