What is meant by chemical change?
Complete the following reaction given below-
1. Sodium when reacts with oxygen forms.
2. Magnesium when reacts with hydrochloric acid forms.

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Solution

A change that involves the formation of new substances from the original substances.
The reactions given below are -
1. Sodium when reacts with oxygen forms sodium oxide.
2. Magnesium when reacts with hydrochloric acid forms magnesium chloride followed by evolution of hydrogen gas.

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what happens when:(write balanced chemical equations)

(a)sodium reacts with oxygen

(b)sulphur reacts with oxygen

(c)aluminium reacts with dilute hydrochloric acid

When magnesium oxide reacts with hydrochloric acid it forms:

1. What happens when sodium hydroxide reacts with hydrochloric acid ?

2. What happens when Potassium hydroxide reacts with hydrochloric acid ?

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