Density. Go through the powerpoint and take notes on the back of your Density Webquest.

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1 Density Go through the powerpoint and take notes on the back of your Density Webquest.

2 Which do you think would have the greater volume and mass? Why? 1 kg of feathers 1 kg of rock

3 What the heck is density? Density is a measure of the compactness of particles Density is how much matter is crammed into a certain space. Density is NOT the same as weight.

4 Here s an analogy Have you ever gone on vacation and been sucked into buying all of those tacky souvenirs? And then you pack to go home and your suitcase will barely hold it all?! Your suitcase has just become more dense than when you left home it has more stuff crammed into the same space.

5 Give me some examples I don t get it. Batteries feel dense because they have a lot of metal packed tightly inside. I m more dense than You! A wooden block is about the same size (volume) as a 9 volt battery, but it feels much lighter because there are not as many particles inside.

6 Give me some examples I don t get it. Chocolate feels dense because it has a lot of sugar packed tightly inside. I m more dense than You! A marshmallow that is about the same size (volume) as the chocolate feels much lighter because there are not as many particles inside. Some of the particles are even air bubbles!

7 Give me some examples I don t get it.

8 Give me some examples I don t get it.

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10 In MATH language Density is the amount of mass an object has compared to its volume or Density = mass volume

11 For Math Phobics. A way to determine relative density it to do the old floater / sinker test. Water has a density of 1 g/ml. If something floats in water, it has a density less than 1 g/ml. If something sinks in water, it has a density of greater than 1 g/ml.

12 Do all rocks sink?

13 Does all wood float?

14 See? You already LOVE density!

15 I love it so much Sometimes I even draw a heart and shoot an arrow through it when I am daydreaming about density.

16 Back to the formula If you squint your eyes, this sorta looks like an m v

17 Back to the formula Your mind is now forever corrupted you won t be able to see a cupid s heart without thinking about density

18 Now, let s put the formula to use The m stands for mass. What is mass? Mass is the amount of particles (matter) in something. Here on earth, that kinda means how much it weighs, since the location is all the same.

19 Now let s put the formula to use To find the mass, use a triple beam balance. Or a digital scale

20 Now let s put the formula to use What is the measurement reading on this triple beam balance? grams = grams

21 Now let s put the formula to use, The V stands for volume. What is volume? Volume is the amount of space that something takes up.

22 Now let s put the formula to use To find the volume of a cubic shape, use a centimeter ruler. Notice that there are no markings for ½ or ¼ etc. Each little line is 0.1 centimeters.

23 Now let s put the formula to use To find the volume of something irregular (doesn t have a perfect cubic shape) use the water displacement method with a graduated cylinder or an overflow can.

24 Now let s put the formula to use, 1- Put some water in the graduated cylinder and make a note of how much is in there. 2- Drop in the thing you want to measure. 3- Make a note of the new water level reading. 4- Find the CHANGE in water level by subtracting.

25 Now let s put the formula to use What is the measurement reading on this graduated cylinder? Read from the bottom of the meniscus (the curved bubble thing) 52 milliliters or 52 ml

26 Volume UNITS 1 cubic centimeter = 1 cm 3 = 1 cc =1 ml

27 Now let s put the formula to use Calculate the density of water. (Remember to find the mass of the container first.)

28 To find the density 1 - Find the mass of the object 2- Find the volume of the object 3- Divide them Density =

29 m v = g 200 ml 2.4 g / ml

30 Units for density g/cm 3 or g/ml Formula: M = mass V= volume D = density M = D x V V = M / D D = M / V

31 Ex. To find density: 1) Find the mass of the object 2) Find the volume of the object 3) Divide : Density = Mass Volume If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density.

32 Ex. To find density: Set up your density problems like this: 1) Find the mass of the object 2) Find the volume of the object 3) Divide : Density = Mass Volume If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density. Given: Mass = 35 grams Formula: D = M V Volume = 7 cm 3 Unknown: Density (g/ cm 3 ) Solution: D = 35 g 7 cm 3 D = 5 g/cm 3

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35 LIQUID LAYERS

36 Liquid Layers If you pour together liquids that don t mix and have different densities, they will form liquid layers. The liquid with the highest density will be on the bottom. The liquid with the lowest density will be on the top.

37 Steve Spangler 7 layer density

38 Learning Check Which diagram correctly represents the liquid layers in the cylinder? Karo (K) syrup (1.4 g/ml), vegetable (V) oil (0.91 g/ml,) water (W) (1.0 g/ml) V W K W K V K V W 38

39 Solution 1) V W K Vegetable oil 0.91 g/ml Water 1.0 g/ml Karo syrup 1.4 g/ml 39

40 Liquid Layers Check out this picture from your book. Which layer has the highest density? Which layer has the lowest density? Imagine that the liquids have the following densities: 10g/cm 3 3g/cm 3 6g/cm 3 5g/cm 3 Which number would go with which layer?

41 Liquid Layers Check out this picture from your book. Which layer has the highest density? Which layer has the lowest density? Imagine that the liquids have the following densities: 10g/cm 3 3g/cm 3 6g/cm 3 5g/cm 3 Which number would go with which layer? 3g/cm 3 5g/cm 3 6g/cm 3 10g/cm 3

42 Liquid Layers Which liquid has the highest density? Which liquid has the lowest density? Which liquid has the middle density?

43 Liquid Layer Which liquid has the highest density? Golden syrup Which liquid has the lowest density? oil Which liquid has the middle density? water

44 Liquid Layers Try on your own! 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 9g/cm 3 12g/cm 3 7g/cm 3 10g/cm 3 15g/cm 3

45 Sink or Float Ice floats in water because the density of ice is less than the density of water. Aluminum sinks because its density is greater than the density of water. Copyright 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings 45

46 Liquids: Corn syrup is most dense, the water, then oil is least dense. The Nut sinks to the bottom. It is the most dense material in the cup. The grape is more dense than water and oil, but less dense than corn syrup. The lego is more dense than oil, but less dense than water. The styrafoam is the least dense material in the cup.

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48 Video: ZOOM - Making Eggs Float

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62 Don t be dense! Science will save the galaxy!

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