Page 214 - New Medley 5 Semester 2

REMEMBER THESE TERMS

Matter : Anything that occupies space and has weight
Atom : Tiny particle that forms building blocks of matter
Molecule : Tiny particle formed when two or more atoms combine

Element : A substance that consists of atoms of only one kind

Check Your Study

A. Tick () the correct answers.

1. Air is a

(a) Compound (b) Mixture
(c) Element (d) Atom

2. Water is made up of atoms of
(a) Carbon and oxygen (b) Carbon and hydrogen

(c) Oxygen and hydrogen (d) Nitrogen and hydrogen

3. is is a physical change.
(a) Rusting of nail (b) Trimming of hair

(c) Spoiling of food (d) Burning of wood

B. Write True or False.

1. Liquids have xed volume and xed shape.
2. Atoms are the smallest unit of matter.

3. Two or more atoms combine to form a molecule.
4. Melting of wax is a physical change.

C. Answer these questions.

1. Di erentiate among solids, liquids and gases.
2. What is a compound? Give two examples of compounds.
3. How are elements, compounds and mixtures di erent from each other?

4. What kind of change is brought in rice, a er it is cooked? Why?

5. Name the substances produced a er burning a candle wick.
6. How are physical changes di erent from chemical changes?

212