Chapter: Physical and Chemical Changes
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All changes that you see can be broadly divided into physical and chemical changes. Properties such as shape, size, colour and state of a substance are called its physical properties.
A physical change is temporary. A physical change is generally reversible. In such a change no new substance is formed.
Forms of energy, such as heat, light and electricity, are neither emitted nor absorbed in a physical change.
Some changes are in the form of chemical reactions, which lead to the formation of new substances. These are called chemical changes. These changes may be accompanied by the emission of heat, light or sound, a change in colour, or the formation of a gas.
A chemical change is permanent and A new substance is formed. Forms of energy, such as heat, light or electricity, may be emitted or absorbed during a chemical reaction.
A chemical change is generally irreversible.
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