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Density

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**Density compares the mass of an object to its volume**

What is density? Density compares the mass of an object to its volume

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**Which one is more dense? Demonstration: People in a square**

How about this: Which square is more dense? How do you know?

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

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**What is density? Density = mass OR. volume Units for density: g cm3**

Why are these the units for density? ALWAYS REMEMBER UNITS!

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**a formula To find volume, use… water displacement 1. V = p r2 h**

V = l w h 2. water displacement V = ? Vfinal Vinit Vobject = Vfinal – Vinit

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**Equation of a Straight Line**

y = mx + b Slope Y intercept

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**Slope of a Straight Line**

The Slope of a straight line shows how steep a straight line is. Calculate: Divide the change in height by the change in horizontal distance Slope = Change in Y Change in X

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Examples: Mass (g) Slope = 3 g = 1 g 3mL mL density Volume (mL) Slope = density = 4 g = 2 g 2mL mL Mass (g) Volume (mL)

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**Solving problems in science using the GUESS strategy**

Given Unknown Equation Substitute Solve

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**Let’s try a density problem together**

Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? Frank also has an eraser. It has a density of 3g/cm3, and a volume of 2cm3. What is its mass? G U E S m= 9 g V= 3 cm3 D D= M V D = 9g 3 cm3 3 g cm3 G U E S d= 3 g/cm3 V= 2 cm3 M D= M V 3 = m 2 6 g

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**Liquid Layers – Try with your neighbor**

Which liquid has the highest density? Which liquid has the lowest density? Which liquid has the middle density?

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**Liquid Layers Check out this picture.**

Which layer has the highest density? How do you know? Which layer has the lowest density? Imagine that the liquids on the right have the following densities: 15g/cm g/cm3 3g/cm g/cm3 7g/cm g/cm3 Match the colors to the correct densities. 3g/cm3 7g/cm3 9g/cm3 10g/cm3 12g/cm3 15g/cm3

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