(a) What is a physical change ? Give two examples of physical changes.
(b) What is chemical change ? Give two examples of chemical changes.
(a) What is a physical change ? Give two examples of physical changes.
(b) What is chemical change ? Give two examples of chemical changes.
a)A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. It is the reversible process. It does temporary changes.
Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle
b) Chemical Changes
One or more substances, at times, react with one another or substances which are readily available in the environment. It is the irreversible process. It does permanent changes. This consequently leads to the formation of new substance(s). The formation of the new substance can also be accompanied by one or more of the following:
- Emission of Heat as a result of a Chemical Changes
- Absorption of Heat as a result of a Chemical Changes
- Emission Light as a result of a Chemical Changes
- Production of Sound as a result of a Chemical Changes
- Change or emission of Odour as a result of a Chemical Changes
- Emission of Gas as a result of a Chemical Changes
- and so on.
Examples of Chemical Change
- Rusting of Iron
- Souring of Milk
- Ripening of Fruits
- Digestion of Food
- Bursting of Cracker
a)A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. It is the reversible process. It does temporary changes.
Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle
b) Chemical Changes
One or more substances, at times, react with one another or substances which are readily available in the environment. It is the irreversible process. It does permanent changes. This consequently leads to the formation of new substance(s). The formation of the new substance can also be accompanied by one or more of the following:
- Emission of Heat as a result of a Chemical Changes
- Absorption of Heat as a result of a Chemical Changes
- Emission Light as a result of a Chemical Changes
- Production of Sound as a result of a Chemical Changes
- Change or emission of Odour as a result of a Chemical Changes
- Emission of Gas as a result of a Chemical Changes
- and so on.
Examples of Chemical Change
- Rusting of Iron
- Souring of Milk
- Ripening of Fruits
- Digestion of Food
- Bursting of Cracker
