Density 1 3 What is density l Density

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Density #1 -3

Density #1 -3

What is density? l Density is a comparison of how much matter there is

What is density? l Density is a comparison of how much matter there is in a certain amount of space.

Which one is more dense? l Demonstration: People in a square l How about

Which one is more dense? l Demonstration: People in a square l How about this: Which square is more dense?

Which one is more dense? l Now which one is more dense?

Which one is more dense? l Now which one is more dense?

What is density? l Density = mass OR volume mass ÷ volume. l Units

What is density? l Density = mass OR volume mass ÷ volume. l Units for density: g cm 3 l Why are these the units for density? ALWAYS. REMEMBER UNITS!

Sink or Float? l The density of water is 1 g/cm 3 l Suppose

Sink or Float? l The density of water is 1 g/cm 3 l Suppose you have a block of wood and a block of iron of equal mass. When you drop both blocks into a tub of water, you see that the wood floats and the iron sinks. What do you suppose is the density of each of these items?

Gold, real or fake? l Pearson website pg 295 l page 295

Gold, real or fake? l Pearson website pg 295 l page 295

Let’s try a density problem together l Frank has a paper clip. It has

Let’s try a density problem together l Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm 3. What is its density? l Frank also has an eraser. It has a mass of 3 g, and a volume of 1 cm 3. What is its density?

Work on these problems with your neighbor. l Jack has a rock. The rock

Work on these problems with your neighbor. l Jack has a rock. The rock has a mass of 6 g and a volume of 3 cm 3. What is the density of the rock? l Jill has a gel pen. The gel pen has a mass of 8 g and a volume of 2 cm 3. What is the density of the rock?

Now, try these on your own. l Al’Licia has a watch. It has a

Now, try these on your own. l Al’Licia has a watch. It has a mass of 4 g and a volume of 2 cm 3. What is the density of the watch? l Mia has a wallet. It has a mass of 15 g and a volume of 5 cm 3. What is the density of the wallet?

Liquid Layers l If you pour together liquids that don’t mix and have different

Liquid Layers l If you pour together liquids that don’t mix and have different densities, they will form liquid layers. l The liquid with the highest density will be on the bottom. l The liquid with the lowest density will be on the top.

Liquid Layers l Check out this picture from your book. Which layer has the

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

Liquid Layers – Try with your neighbor l Which liquid has the highest density?

Liquid Layers – Try with your neighbor l Which liquid has the highest density? l Which liquid has the lowest density? l Which liquid has the middle density?

Liquid Layers – Try on your own! l Imagine that the liquids on the

Liquid Layers – Try on your own! l Imagine that the liquids on the right have the following densities: ¡ 15 g/cm 3 ¡ 3 g/cm 3 ¡ 7 g/cm 3 10 g/cm 3 9 g/cm 3 12 g/cm 3 l Match the colors to the correct densities. 3 g/cm 3 7 g/cm 3 9 g/cm 3 10 g/cm 3 12 g/cm 3 15 g/cm 3

Review HW l What is the formula for density? l What happens if you

Review HW l What is the formula for density? l What happens if you pour together liquids that have different densities? l Will the liquid on the top have the highest or lowest density? l Will the liquid on the bottom have the highest or lowest density?

Review Continued Calculate Density l What is the density of a liquid with a

Review Continued Calculate Density l What is the density of a liquid with a mass of 17. 4 g and a volume of 20 m. L? l What is the mass of a sample of a substance with a volume of 120 m. L and a density of 0. 75 g/m. L?

Super Scientist Question of the Day l Jake has a book, a ruler, and

Super Scientist Question of the Day l Jake has a book, a ruler, and a balance. l How can Jake find the density of the book with the tools he has?