We've learned that atoms can be close together or far apart

Scientists have a word that tells us how close together something's atoms are

Density means how closely packed together something's atoms are

If something is very dense that means its atoms are very close together

If something is not very dense this means its atoms are far apart

Let's practice...

1) What does density mean?

2) If something is not dense, how far apart are its atoms?

3) If something is very dense, how far apart are its atoms?

Solids, liquids, and gases have different densities

Solids are most dense, liquids are medium dense, and gases are the least dense

Let's practice...

1) Order the words: liquid, gas, solid from most dense to least dense

Different objects in the same phase can have different densities.

You can tell which object is more dense by how far it sinks in water.

Let's practice....

1) Which object is most dense?2) Which object is least dense?

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Density is also affect by how heavy the atoms that make an object are.

The atoms that make metal are heavier than the atoms that make plastics

QUIZ GAME

1. What is density?

2. What do the atoms look like in a object that is not very dense?

3. What do the atoms look like in an object that is very dense?

4. Name an object that is very dense?

5. Name an object that is not very dense?

6. Which phase is the most dense?

7. Which phase is the least dense?

8. Name the phases from most dense to least dense?

9. True or false: Different objects in the same phase have to have the same density?

10. How do you tell if one object is more dense than another?

11. What is the melting point?

12. What is the boiling point?

13. Which phase has the hottest atoms?

14. You put 2 objects in the water. Object number 1 floats on the top of the water and object number 2 sinks to the bottom. Which object is more dense?

15. Which object is more dense: a nail or a scrap of cardboard the same size?