Density Read through the PPT and take notes

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

Density is the measure of the “compactness” of a material. n Density is determined

Density is a RATIO of mass to volume. l If the temperature stays the

If you take the same volume of different substances, then they will weigh different

Which one is more dense? l Demonstration: Hula-hoop Density… try it! l How about

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

How do we determine density? To calculate the density of something: l Density =

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

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

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

Think about it… Do water and ice have the same density? Proof that ice

What would happen? ? n Mercury density = 13, 600 kg/m 3 n Lead

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

Let’s Do a Demonstration: Density Column l The liquid with the lowest density (NOT

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

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

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

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

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

Slides: 21

Download presentation

Density Read through the PPT and take notes on Density. Don’t forget a Title and a subtitle for each section! Hint: Titles are underlined & Important things are in red.

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

Density is the measure of the “compactness” of a material. n Density is determined by how close the atoms are to each other “Compactness” n All substances have density including liquids, solids, and gases

Density is a RATIO of mass to volume. l If the temperature stays the same, the Density of solids & liquids do not change… discuss this. l Because of this density is a Characteristic Property and is used to help identify unknown substances.

If you take the same volume of different substances, then they will weigh different amounts. Wood Water Iron 1 cm 3 0. 50 g 1. 00 g 8. 00 g IRON Q) Which has the greatest mass and therefore the most dense?

Which one is more dense? l Demonstration: Hula-hoop Density… try it! l How about this: Which square is more dense? l Why? If the volume is the same but the mass is higher then density will be higher - More matter in the same space! Illustrate and label the two different densities as more & less dense.

Which one is more dense? l Now which one is more dense? l Why? If the mass is the same but the volume is smaller. . . The density will be higher. Same amount of matter but a smaller volume or space! Illustrate and label the two different densities as high & low.

How do we determine density? To calculate the density of something: l Density = mass ÷ volume OR l Units for density: g cm 3 l Why are these the units for density? mass OR m volume v ALWAYS REMEMBER UNITS!

A little trick to remember! I DENSITY

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? M g D= V D = cm 3 D = 39 cmg 3 D = 3 cmg 3 l Frank also has an eraser. It has a mass of 3 g, and a volume of 1 cm 3. What is its density? 3 g g M l. D = V D = cm 3 D = 1 cm 3 D = 3 cmg 3

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 pen?

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?

Think about it… Do water and ice have the same density? Proof that ice and water have DIFFERENT densities!

What would happen? ? n Mercury density = 13, 600 kg/m 3 n Lead density = 11, 340 kg/m 3 Lead floats on liquid mercury!

Liquid Layers l If you pour together liquids that don’t mix and have different densities, they will form liquid layers. l Can you think of examples?

Let’s Do a Demonstration: Density Column l The liquid with the lowest density (NOT very dense) will be on the top or float. . l The liquid with the highest density (more dense) will be on the bottom or sink.

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 (remember liquid volume is m. L or L): ¡ 10 g/m. L ¡ 3 g/m. L ¡ 6 g/m. L ¡ 5 g/m. L l Which density would belong with which layer?

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 right have the following densities: ¡ 15 g/m. L ¡ 3 g/m. L ¡ 7 g/m. L 10 g/m. L 9 g/m. L 12 g/m. L l Match the colors to the correct densities. 3 g/m. L 7 g/m. L 9 g/m. L 10 g/m. L 12 g/m. L 15 g/m. L

Review 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?

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