Chemistry definition

1. What is science?

Science is the systematic study of the natural world that involves observation and experimentation.

2. What is chemistry?

The study of elements and compounds is called chemistry. 

             Or

     The study of elements, compounds, and their properties, structures, reactions, and interactions is called chemistry. It also encompasses the study of how these substances combine and change to form new substances.

3. What is boiling point?

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

4. What is the boiling point of water?

 The boiling point of water is 100°C (212°F) at standard atmospheric pressure (1 atmosphere or 101.3 kPa).

5. What is an element?

An element is a substance that is made up of only one kind of atom.

6.What are compounds?

Compounds are substances made from two or more different elements that are chemically bonded together. For example, water (H₂O) is a compound made of hydrogen and oxygen.

                  Or

Compounds are the substances that are made up of two or more elements.

7. What are molecules?

A molecule is a group of two or more atoms that are bonded together.