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Density

Density. Why are boys so dense some times?. DEMO. Materials: One liter beaker One small vial (about 25 mL) Cold water (cooled with ice and let melt) Colored hot water (use a dark color for best results) Foil Pencil Piece of string. Observation. A. What is density?. Defined as….

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Density

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  1. Density Why are boys so dense some times?

  2. DEMO • Materials: One liter beaker One small vial (about 25 mL) Cold water (cooled with ice and let melt) Colored hot water (use a dark color for best results) Foil Pencil Piece of string Observation

  3. A. What is density? Defined as…..

  4. Prediction What do you think will have greater mass? • A gram of feathers • A gram of chocolate

  5. Which one will have more volume? (what does this mean) 1. A gram of feathers 2. A gram of chocolate

  6. To determine the density of an object use: Density = mass (g) Volume (mL) or (cm3) Notice the units? These will be included with your answer!!

  7. Math Skills and Science • Write the original formula • Solve the formula for the missing variable • Substitute the values and units • Math • Record answer with proper units, box or happy cloud

  8. Which is denser?Make a prediction

  9. Work area…..

  10. Let’s practice, regular shaped solid Determine the volume of this cube. ____________________ The mass is 20.0 g. What is this cube’s density? _____________________ 1.O cm 1.O cm 1.O cm

  11. B. What is density good for anyway? • Density is a physical property of matter • Density is specific to the type of matter • Example: water has a density of 1.0g/mL • Example: bag of materials with all the same masses but different volumes • Therefore (drum roll please……. ) • Density can be used to identify unknownsubstances

  12. Look the same, right?

  13. 3. The only way to change a substances density is to change its phase! (solid, liquid, gas)

  14. Determining density

  15. Chocolate Lab • Materials • Clean paper • Electronic balance • Ruler • Work in a group of four

  16. c. Solid, liquid, gas, and Plasma 1. Solid • a state of matter that had a definite shape and volume. • Particles of matter are tightly packed together. The particles cannot change position. They can only vibrate.

  17. 2. Liquid • State of matter that has a definite volume but not definite shape. • Liquids are able to change shape because the particles of a liquid can change position.

  18. 3. Gas • State of matter that have no definite shape or volume. • Gas takes the shape of its container. • The particles of gases are constantly moving. They are much farther apart.

  19. 4. Plasma: • State of matter made up of small electrically charged particles which make it up. • It is very rare on Earth but it is found in other parts of the universe. You can find it in stars where the temperature and the pressure are very high

  20. D. Changes in states of matter • Matter can change from one state to another • Add heat • Take out heat • There are five (5) phase changes

  21. Freezing

  22. 2. Melting

  23. 3. Evaporation

  24. 4. Condensation

  25. 5. Sublimation

  26. E. Physical Properties of matter • Density • Shape • Size • Color • Texture

  27. F. Physical Change • A change that does not produce a new substance • Example: rip a piece of paper in half • Example: freeze water • Still the same chemical composition, can put it back to its original state

  28. G. Chemical Change • A change that produces a new substance • Example: burn a piece of paper http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes_fs.shtml

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