Density Reassessment Review

1. Density Reassessment Review • Click “SLIDESHOW” then “From Beginning” to view this presentation properly.

2. Density Reassessment Review • Directions • Read each page carefully and think about what you are reading • Next, try to repeat the information on the page in your own words (out loud or in your head). • Finally, take notes on the page if it contains important information.

3. Density • If you think that these lily pads float because they are lightweight, you are only partially correct. The ratio of the mass of an object to its volume can be used to determine whether an object floats or sinks in water. • A paperclip is very “light” but it will sink!

4. Mass • Measurement of the amount of matter (or stuff) in an object – Remember what “matters” is on the “in”side  • The unit mass is measured in is grams (g)

5. Volume • Measurement of the amount of space an object takes up is volume. • Liquid volume is measured in liters (L) or milliliters (ml) by simply pouring it into a graduated cylinder and reading the amount.

6. Volume • The units for volume of a regular shaped solid is cubic centimeters (cm3 ) • To calculate the volume of a regular shaped solid is Length x Width x Height.

7. Volume • To find the volume of an irregular shape you use water displacement.

8. Volume Review

9. Density • What is density? • Density is the amount of matter in a given space, • or the amount mass per unit of volume. • Examples, (oil spill, Italian salad dressing etc.) • Visual

10. Determining Density • Density is the ratio of how much mass (g) is crammed into a given volume (cm³) • Density is calculated by dividing the mass by the volume.

11. Determining Density • Which block has the greatest density? • What makes the 10g lead block the most dense? • It has the same mass but crammed into less volume.

12. Determining Density • Sample Densities • Which item is most dense?____________ • Which item is least dense?____________

13. Determining Density • The density of vegetable oil is 0.9 g/cm³ and is less than the density of corn syrup which is 1.38 g/ml. For that reason, the oil floats on top of the syrup. • Water has a density of 1 g/cm³. If a substance is less dense than water, it floats. If a substance is more dense than water, it sinks. • Oil will ____________ in water. • Syrup will __________ in water. float sink

14. A rock has a mass of 210 grams and occupies a volume of 70 cm3. What is its density? 210 g (mass) ÷ 70 cm³ (volume) = 3 g/cm³ (density)

15. Liquid Layers Imagine that the liquids on the right have the following densities: • 15g/cm3 10g/cm3 • 3g/cm3 9g/cm3 • 7g/cm3 12g/cm3 Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

16. An unknown liquid occupies a volume of 5 mL and has a mass of 40 grams. Find its density. 40 (mass) / 5 mL (volume) = 8 g/cm3 (density) Will this substance sink or float in water (hint – water has a density of 1 g/cm³)? SINK!

17. Section Quiz • 1. If 100 mL of a liquid has a mass of 50 g, the density of the liquid is • 2 g/mL. • 0.2 g/mL. • 5 g/mL. • 0.5 g/mL.

18. Section Quiz • 2. What is the density of a coin that has a mass of 36 g and a volume of 6 cm³? • 0.5 g/cm3 • 6 g/cm3 • 36 g/cm3 • 5 cm3

19. Section Quiz • 3. You find a rock with a mass of 500g. You put the rock in 50 mL of water and it rises to 150 mL. What is its density? • 5 g/cm³ • 10 g/cm³ • 1 g/cm³. • 15 g/cm³

20. Section Quiz • 3. You find a box with a mass of 250g. You measure it to find it has a length of 5 cm width of 5 cm and a height of 10 cm. What is its density? • 250 g/cm³ • 10 g/cm³ • 1 g/cm³. • 50 g/cm³

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