Question

1. What is meant by a chemical reaction ?​

Answer 1

Answer:

chemical reaction is a permanent reaction . in this reaction , the change of one or more substance into other substance having different composition and different property is called chemical reaction.

Answer 2

A chemical reaction can be described by a chemical equation . It includes chemical formula for each substance involved in a reaction.

For example when Magnesium metal is Burn It combines with oxygen in the air to form magnesium oxide .

In this reaction to molecules of magnesium combine with was molecule of oxygen to form the to magnesium oxide molecules .

Some sings of chemical reaction:-

• new substances are formed .
• a gas may be form producing Bubbles and also distinct smell .
• there maybe colour change .
• a precipitate may be formed .
• it may be given off or absorbed .
• sound may be produced .
• some chemical reaction produce electric current .

Hope it help's uh...

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