Question

give two examples to show that changes can be observed by their effect​

Answer 1

Answer:

ripening of mango

rusting of iron

Explanation:

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Answer 2

Explanation:

We see ice melting into water, water boiling to vapours and vapours precipitating into the water droplets on cooling. These are some of the examples of Physical Changes since the transition is in the Physical Properties of Water. Substances in Nature undergo various types of changes. The changes that they can undergo are widely classified into two categories viz. Physical and Chemical Changes.

Changes in the Physical Properties of a Substance are known as Physical Changes. Physical Properties of a Substance include colour, size, shape, state, temperature, odour, appearance, texture and many more. In addition, Physical Changes do not lead to the formation of new substances. Physical Changes may or may not be reversible.

Examples of Physical Change

Breaking/Crushing of any Object

Expansion of Metal on Heating

Dissolving Sugar or Salt (Solute) in Water (Solvent) (as a result, a solution is formed)

Solidification of Molten Metal on Cooling