Answer:

1. When water is boiled, it undergoes a physical change, not a chemical change. The molecules of water don't break apart into hydrogen and oxygen. Instead, the bonds between molecules of water break, allowing them to change physically from a liquid to a gas. ... The gaseous form is water vapor.

2. What forms of energy do we use everyday?

The common forms of energy used in our houses are electrical energy, chemical energy available from fuels, food and energy originating from the sun. Electrical energy is transformed into many forms - mechanical/kinetic, sound, heat, light, and other forms of electromagnetic radiation - by everyday appliances.

3. If a metal spoon is dipped into a cup of hot water, the end of the spoon soon feels warm. Heat is transferred along the spoon by conduction. When a point on an object is heated, the molecules there vibrate more strongly. Conduction is the transfer of these vibrations within the material.

4. Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.

Explanation:

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