we have learned that:
1. Matter has mass and it occupies space.

2. Matter can be classified into solids, liquids, and gases.

3. Solids are substance with a definite volume, but the assume the shape of their container.
Gases are substances with neither a definite volume nor a definite shape.

4. Matter is composed of tin particles called molecules.

5. Molecules. in solids are arranged farther apart.

6. The molecules in liquids are arranged farther apart than in solids.

7. The molecules in gasses are arranged still farther apart than in liquids

8. Molecules are composed of smaller parts called atoms.

9. Spaces exist between molecules.

10. Molecules are in constant motion.

11. Molecules in gases move fast.

12. In liquids they move slower, and in solids, it move slowest.

13. Evaporation is the process by which liquid change to gas.

14. Condensation is the process in which a gas is change to liquid.

15. Melting the process in which a solid will change to liquid.

16. Freezing is the process in which a liquid will change to solid.

17. Mixture has no definite properties

18. Substance is a homogeneous material consisting of one particular kind of matter.

19. Homogeneous mixture when it has uniform composition.

20. Heterogeneous mixture when its components and properties are not distributed evenly

21. Chemical Change when substance change its appearance, occurs when it transforms into
another substance having different set of properties.

22. Physical change when substance change its appearance.​