Unit F: Chemical Reactions - Types of change

Ice turning into water is a physical change, as the chemicals are the same, and it is easily reversible.

Water turning into ice is a physical change, as the chemicals are the same, and it is easily reversible.

Physical change is a change which does not alter the chemical contents of the item, such as something changing state.

Physical change is easily reversible.

Chemical change is a change which affects the chemical contents of the item.

This type of change is impossible or hard to reverse.

Rotting Cheese is a chemical change because rotting chemicals have formed and it is irreversible.

Cooking an egg is a chemical change because the chemicals are in a cooked state, and they cannot be 'uncooked' (irreversible)