Question

2. When two substances are brought in contact, there may be a physical or a chemical change, depending on
the conditions. Give two examples to prove this statement.​

Answer 1

When two substances are brought in contact, there may be a physical or a chemical change, depending on

When two substances are brought in contact, there may be a physical or a chemical change, depending onthe conditions this statement is correct examples are:

1) When acid came in contact with base it react with base to form salt and water.

(chemical change)

2) When a burning candle came in contact with Hydogen it make a pop sound.(Physical change)

Hope it helps

Answer 2

Answer:

it may be possible...

Explanation:

phsical change-

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

example-

Heating and cooling

Many elements and some compounds change from solids to liquids and from liquids to gases when heated and the reverse when cooled. Some substances such as iodine and carbon dioxide go directly from solid to gas in a process called sublimation.

chemical change-

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

example-

in organic changes and organic changes

e.g-

1. the ice is put in contact with the hot iron ball, then the ice melts so, there is the physical change.
2. the curd and milk are put in together to form more curd so, it is the chemical change.