1. A (BLANK) change occurs when a material changes shape of size but the composition of the material does not change

2. (BLANK) properties can be observed only when the substances in a sample of matter are changing into different substances

3. Materials can be classified as solids, liquids, or gases based on whether their shapes and (BLANK) are definite or variable

4. The (BLANK) theory of matter states that all particles of matter are in constant motion.

1. Physical

2. Chemical

3. Volume

4. Kinetic

Explanation:

1. Physical changes are said to occur when only shape and size of matter changes and there is no change in the chemical composition. Example: when paper is cut into two pieces. It is physical change.

2. Chemical changes are said to occur when there is change in its chemical composition. Example: when paper is burnt, it turns to ashes. It is a chemical change.

3. Materials can be classified as solids, liquids or gases on the basis of their shape and volume. Constituent particles of solid are closely packed where as in gases, the particles are very loosely packed.

4. The Kinetic theory of matter states that matter is composed of small particles and all particles of matter are in constant motion.

1. Physical

2. Chemical

3. volumes

4. Kinetic