End Show Slide 1 of 25 Density 3.4. End Show © Copyright Pearson Prentice Hall Slide 2 of 25 Density If you think that these lily pads float because they.

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Presentation transcript:

End Show Slide 1 of 25 Density 3.4

End Show © Copyright Pearson Prentice Hall Slide 2 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. 3.4

End Show © Copyright Pearson Prentice Hall Slide 3 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 4 of 25 Density > Determining Density Density is the ratio of the mass of an object to its volume. 3.4 Key words: Mass & Space or Mass & Volume

End Show © Copyright Pearson Prentice Hall Slide 5 of 25 Density > Determining Density Which block has the greatest density? What makes the 10g lead block the most dense? 3.4

End Show © Copyright Pearson Prentice Hall Slide 6 of 25 Density > Determining Density Sample Densities 3.4

End Show © Copyright Pearson Prentice Hall Slide 7 of 25 Density > Determining Density The density of corn oil is 0.93 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. 3.4

End Show © Copyright Pearson Prentice Hall Density > Slide 8 of 25 Density and Temperature How does a change in temperature affect density? Experiments show that the volume of most substances increases as the temperature increases. Meanwhile, the mass remains the same. Thus, the density must change. 3.4

End Show © Copyright Pearson Prentice Hall Density > Slide 9 of 25 Wandering Water Tank Which color of H20 will end up on top the red (hot) or the blue (cold) when the dividing plate is pulled? Why?

© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 10 of 25 End Show g (mass) /.35 cm3 (volume) = 8.85 grams/cm3 (density)

© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 11 of 25 End Show What is the most dense substance in the picture? Why does the oil float on top of the water?

© Copyright Pearson Prentice Hall Slide 12 of 25 End Show Practice Problems for Sample Problem g (mass) / 6.48 cm 3 (volume) = 1.4 g/cm3 (density)

© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 13 of 25 End Show 3.11

© Copyright Pearson Prentice Hall Slide 14 of 25 End Show 3.4 Section Quiz 1. If 50.0 mL of corn syrup have a mass of 68.7 g, the density of the corn syrup is a g/mL. b g/mL. c.1.36 g/mL. d.1.37 g/mL.

© Copyright Pearson Prentice Hall Slide 15 of 25 End Show 3.4 Section Quiz 2. What is the volume of a pure gold coin that has a mass of 38.6 g? The density of gold is 19.3 g/cm 3. a cm 3 b.2.00 cm 3 c.38.6 cm 3 d.745 cm 3

© Copyright Pearson Prentice Hall Slide 16 of 25 End Show 3.4 Section Quiz 3. As the temperature increases, the density of most substances a.increases. b.decreases. c.remains the same. d.increases at first and then decreases.

© Copyright Pearson Prentice Hall Slide 17 of 25 End Show Bubbling Density Concoction ments/bubbling-density-concoction

© Copyright Pearson Prentice Hall Slide 18 of 25 End Show Light Ice Heavy Water Baby Oil Density =.82 g/cm3 H20 Ice Density =.91 g/cm3 Vegetable Oil Density =.93 g/cm3 Food Coloring Density = 1.0 g/cm3 Draw the placement of substance after being placed into the cup in random order.

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