Question

What is the difference between physical and chemical change with proper example?

Answer 1

PHYSICAL CHANGES

1. No new substance is formed in a physical change and is a temporary change ( it can be reversed)
2. Very little heat or light is usually absorbed or given out
3. The mass of a substance does not alter in a physical change

9CHEMICAL CHANGES
A new substance is formed in a chemical change and is a permanent change ( is usually irreversible)
A lot of heat or light energy is absorbed or given out
The mass of a substance does alter in a chemical change
Cooking represents a chemical change, and caramelizing is a really good example. When you caramelize flan to make creme brule you turn the simple sugars like glucose into polymers that bind together
Chemical changes involve breaking or creating chemical bonds to make new molecules. For example, burning carbon breaks O-O bonds and creates C-O bonds for a new release of energy.

Physical changes often involve phase change such as from solid to liquid or liquid to gas. They may also include separation of chemicals from mixtures, or things dissolving in a liquid. They do not involve breaking chemical bonds.

Examples: dissolving sugar in water, freezing ice, boiling water, mixing water and vodka, separating the components of petroleum by fractionation.