End Show © Copyright Pearson Prentice Hall Slide 1 of 25 Density Reassessment Review Click “SLIDESHOW” then “From Beginning” to view this presentation properly.

End Show © Copyright Pearson Prentice Hall Slide 2 of 25 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.

End Show © Copyright Pearson Prentice Hall Slide 3 of 25 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!

End Show © Copyright Pearson Prentice Hall Slide 4 of 25 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)

End Show © Copyright Pearson Prentice Hall Slide 5 of 25 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.

End Show © Copyright Pearson Prentice Hall Slide 6 of 25 Volume The units for volume of a regular shaped solid is cubic centimeters (cm 3 ) To calculate the volume of a regular shaped solid is Length x Width x Height.

End Show © Copyright Pearson Prentice Hall Slide 7 of 25 Volume To find the volume of an irregular shape you use water displacement.

End Show © Copyright Pearson Prentice Hall Slide 8 of 25 Volume Review

End Show © Copyright Pearson Prentice Hall Slide 9 of 25 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

End Show © Copyright Pearson Prentice Hall Slide 10 of 25 Density > 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.

End Show © Copyright Pearson Prentice Hall Slide 11 of 25 Density > 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.

End Show © Copyright Pearson Prentice Hall Slide 12 of 25 Density > Determining Density Sample Densities Which item is most dense?____________ Which item is least dense?____________

End Show © Copyright Pearson Prentice Hall Slide 13 of 25 Density > 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

© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 14 of 25 End Show 210 g (mass) ÷ 70 cm³ (volume) = 3 g/cm³ (density) A rock has a mass of 210 grams and occupies a volume of 70 cm 3. What is its density?

© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 15 of 25 End Show Liquid Layers Imagine that the liquids on the right have the following densities: 15g/cm 3 10g/cm 3 3g/cm 3 9g/cm 3 7g/cm 3 12g/cm 3 Match the colors to the correct densities. 3g/cm 3 7g/cm 3 9g/cm 3 10g/cm 3 12g/cm 3 15g/cm 3

© Copyright Pearson Prentice Hall Slide 16 of 25 End Show Practice Problems 40 (mass) / 5 mL (volume)= 8 g/cm3 (density) An unknown liquid occupies a volume of 5 mL and has a mass of 40 grams. Find its density. Will this substance sink or float in water (hint – water has a density of 1 g/cm³)? SINK!

© Copyright Pearson Prentice Hall Slide 17 of 25 End Show Section Quiz 1. If 100 mL of a liquid has a mass of 50 g, the density of the liquid is a.2 g/mL. b.0.2 g/mL. c.5 g/mL. d.0.5 g/mL.

© Copyright Pearson Prentice Hall Slide 18 of 25 End Show Section Quiz 2. What is the density of a coin that has a mass of 36 g and a volume of 6 cm³? a.0.5 g/cm 3 b.6 g/cm 3 c.36 g/cm 3 d.5 cm 3

© Copyright Pearson Prentice Hall Slide 19 of 25 End Show 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? a.5 g/cm³ b.10 g/cm³ c.1 g/cm³. d.15 g/cm³

© Copyright Pearson Prentice Hall Slide 20 of 25 End Show 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? a.250 g/cm³ b.10 g/cm³ c.1 g/cm³. d.50 g/cm³

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