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Slide 1 of 25

Density Reassessment Review

Click “SLIDESHOW” then “From Beginning” to view this presentation properly.

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Density Reassessment Review

Directions

Read each page carefully and think about what you are reading

Next, try to repeat the information on the page in your own words (out loud or in your head).

Finally, take notes on the page if it contains important information.

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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.

A paperclip is very “light” but it will sink!

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Mass

Measurement of the amount of matter (or stuff) in an object – Remember what “matters” is on the “in”side

The unit mass is measured in is grams (g)

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Volume

Measurement of the amount of space an object takes up is volume.

Liquid volume is measured in liters (L) or milliliters (ml) by simply pouring it into a graduated cylinder and reading the amount.

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Volume

The units for volume of a regular shaped solid is cubic centimeters (cm3 )

To calculate the volume of a regular shaped solid is Length x Width x Height.

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Volume

To find the volume of an irregular shape you use water displacement.

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Volume Review

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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

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Density > Determining Density

Density is the ratio of how much mass (g) is crammed into a given volume (cm³)

Density is calculated by dividing the mass by the volume.

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Density > Determining Density

Which block has the greatest density?

What makes the 10g lead block the most dense?

It has the same mass but crammed into less volume.

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Density > Determining DensitySample Densities

Which item is most dense?____________

Which item is least dense?____________

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Density > Determining Density

The density of vegetable oil is 0.9 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.

Oil will ____________ in water.

Syrup will __________ in water.float

sink

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SAMPLE PROBLEM

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210 g (mass) ÷ 70 cm³ (volume) = 3 g/cm³ (density)

A rock has a mass of 210 grams and occupies a volume of 70 cm3. What is its density?

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SAMPLE PROBLEM

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Liquid Layers

Imagine that the liquids on the right have the following densities: 15g/cm3 10g/cm3

3g/cm3 9g/cm3

7g/cm3 12g/cm3

Match the colors to the correct densities.

3g/cm3

7g/cm3

9g/cm3

10g/cm3

12g/cm3

15g/cm3

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Practice Problems

40 (mass) / 5 mL (volume) = 8 g/cm3 (density)

An unknown liquid occupies a volume of 5 mL and has a mass of 40 grams. Find its density.

Will this substance sink or float in water (hint – water has a density of 1 g/cm³)?

SINK!

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Section Quiz

1. If 100 mL of a liquid has a mass of 50 g, the density of the liquid is

a. 2 g/mL.

b. 0.2 g/mL.

c. 5 g/mL.

d. 0.5 g/mL.

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Section Quiz

2. What is the density of a coin that has a mass of 36 g and a volume of 6 cm³?

a. 0.5 g/cm3

b. 6 g/cm3

c. 36 g/cm3

d. 5 cm3

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Section Quiz

3. You find a rock with a mass of 500g. You put the rock in 50 mL of water and it rises to 150 mL. What is its density?

a. 5 g/cm³

b. 10 g/cm³

c. 1 g/cm³.

d. 15 g/cm³

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Section Quiz

3. You find a box with a mass of 250g. You measure it to find it has a length of 5 cm width of 5 cm and a height of 10 cm. What is its density?

a. 250 g/cm³

b. 10 g/cm³

c. 1 g/cm³.

d. 50 g/cm³

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