1. Properties of solids, liquids and gases

2. Take a handout on the table (Foldable)
Opening Assignment – Page 72 in your textbook
Find the definitions of the two types of solids and add them to your foldable

3. Types of Solids
Properties of a liquid
Properties of a gas

4. Crystalline solid – define it.
How are its particles arranged?
Examples:
Draw a picture (Mrs. Spock will provide picture)
Gases are easily compressed (by adding pressure) What does that mean? Look at page 86.
Amorphous solids - define it. How are the particles arranged?
Draw figure 17 page 86

5. Types of Solids Crystalline Solids
In many solids, particles form regular repeating patterns.
These patterns create crystals.
When a crystalline is heated it melts at a specific temperature called its melting point.

8. Types of solids Amorphous solids
The particles are not arranged in a regular pattern
Plastics, rubber and glass are amorphous solids.
Do not melt at a specific temperature… no melting point.
Become softer and softer.

9. Butter – amorphous solid

13. Gases - look at page 86 Properties of a gas
Unlike a solid or a liquid, a gas can change volume easily
Gasses are easy to compress!

14. What’s the difference between vapor and gas
Vapor vs. Gas
The word vapor is used to describe gases that are usually found as liquids.
Good examples are water or mercury (Hg).
Compounds like carbon dioxide are usually gases at room temperature so scientists will rarely talk about carbon dioxide vapor.

15. Look at page 73 in textbook
Fill in the missing information on your foldable

16. Figure 5-A liquid takes the shape of it’s container but its _______________
Viscosity – define it
Liquids are fluid.. What does that mean?
Finish these sentence s– Liquids with high viscosity ____________________
Liquids with low viscosity _________________
Surface tension – define it.
What can the insect do in Figure 7b page 74 because of surface tension?

17. Liquids Equivalent volumes Fluid
A liquid can take the shape of its container but its volume does not change.
Liquids is a fluid (just like gasses) because they can flow.

18. Properties of liquids Viscosity A liquid’s resistance to flowing.
Depends on the sizwe and shape of the particles and the attraction between them,
Some liquids flow slowly -- honey

19. Properties of liquids Surface tension
The surface of liquids act like a skin.
It is the result of an inward pull among water molecules that bring molecules on the surface together.

20. Water strider – walk on water

21. Water the polar molecule
Water molecules are attracted to other water molecules.
The oxygen end of water has a negative charge and the hydrogen has a positive charge. The hydrogens of one water molecule are attracted to the oxygen from the other water molecules.
This attractive force is what gives water its cohesive properties

22. Float a paper clip on the surface of water

23. Paper clip lab
How many paper clips can you fit into the glass before the water runs over……

24. Cohesion
Water molecules are attracted to other water molecules. The oxygen end of water has a negative charge and the hydrogen has a positive charge. The hydrogens of one water molecule are attracted to the oxygen from the other water molecules. This attractive force is what gives water its cohesive properties .

25. Surface tension
Surface tension is the name we give to cohesion of water molecules at the surface of a body of water. The cohesion of water molecules forms a surface “film” or “skin”. Some substances may reduce the cohesive force of water, which will reduce the strength of the surface “skin” of water.

26. Take a guess!!!!
How many paper clips can you fit into the glass before the water runs over……