Answer:

hii

Explanation:

Dilute HCl: Zn reacts with HCl and form zinc chloride with evolution of hydrogen gas. Dilute HNO3: Zinc reacts with cold and dilute nitric acid and form zinc nitrate, water and nitric oxide. NaCI solution: No reaction will take place as sodium is more reactive than Zn and cannot replace by it.

Answer:

Our Objective

To carry out the following reactions and classify them as Physical or Chemical changes.

Burning of magnesium in air

Sodium sulphate with barium chloride in the form of their solutions in water

Iron nail with copper sulphate solution in water

Zinc with dilute sulphuric acid

Heating of copper sulphate

The Theory

What is a chemical change?

In a chemical change, chemical reaction takes place and the substances undergo a change in their state. During chemical reactions, one substance reacts with another to form a new substance. The chemical composition of the new substance is different from that of the reacting species. Due to a chemical change, the chemical properties of matter also change. That means the product is entirely different from either of the reactants. Some chemical reactions may be either exothermic or endothermic in nature.