Untitled Lesson

Density is a measure of the mass of a material in a given volume.

Recall... what is mass? If you do not remember, forge ahead and review!

What is Density?

Mass is defined as the amount of matter an object has. It is not affected by gravity, and doesn't change based on location.

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Mass differs from weight because weight is affected by gravity.​ Weight is the force of gravity pulling down on you.

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Mass is measured in kilograms.​

​Fun fact! You will weigh less on the moon than you do on Earth! But you will weigh more on Jupiter!

​Mass

All matter takes up space. The amount of space an object takes up is called its volume.

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Volume can be measured in cubic meters (m³), cubic centimeters (cm3), liters, and milliliters (mL​).

​What is volume?

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Rectangular objects - calculate volume by using the formula:​

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Volume = Length x Width x Height.​

​Volume is measured in different ways depending on what shape the object has.

Let's practice using this formula on the next slide.

Multiple Choice

What is mass?

• The amount of space an object takes up

• The amount of matter in a given space

• The amount of matter in an object

Multiple Choice

What is volume?

• The amount of space an object takes up

• The amount of matter in a given space

• The amount of matter in an object

Multiple Choice

What is density?

• The amount of space an object takes up

• The amount of matter in a given space

• The amount of matter in an object

Volume & Density

You can find the density of a 3 dimensional object by dividing its mass by its volume.

Multiple Choice

Which object has the greatest density?

• Box with blue particles

• Box with red particles

• The density of both boxes are equal

Multiple Choice

Which object has the highest density in this picture?

• A

• B

• C

Multiple Choice

What is the volume of 150 grams of lead if it has a density of 11.3 g/cm³?

• 13.3 g
• 13.3 cm³
• .075 g
• 1695 cm³

Multiple Choice

What is the mass of a 25 cm³  liquid if it has a density of 5 g/cm³?

• 125 g

• 5 g

• $$\frac{5g}{cm^3}$$  

• $$0.2\ cm^3$$  

Multiple Choice

Jack has a rock. The rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL
• 7 g/cm³
• 28 g/cm³
• 1/7 g/cm³

Multiple Choice

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³
• 2 g/cm³
• 1/2 g/cm³
• 24 g/cm³

Multiple Choice

Jack has a rock. The rock has a mass of 14 g and a volume of 2 cm³. What is the density of the rock?

• 7 mL
• 7 g/cm³
• 28 g/cm³
• 1/7 g/cm³

Hot liquid is less dense and rises, where cold liquids are more dense and sink.

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​This still applies to liquids

Multiple Choice

As a substance is COOLED it's DENSITY...

• increase

• decreases

• remains equal

Multiple Choice

As a substance is HEATED it's DENSITY...

• increase

• decreases

• remains equal

Multiple Choice

What is the volume of 150 grams of lead if it has a density of 11.3 g/cm³?

• 13.3 g
• 13.3 cm³
• .075 g
• 1695 cm³

Multiple Choice

Put the liquids in order from most dense to least dense?

• 4, 3, 2, 1
• 1, 2, 3, 4
• 3, 4, 2, 1, 
• 4, 3, 1, 2

Multiple Choice

Which type of material rises?

• Material that is more dense

• Material that is less dense

• The density does not determine if particles will rise or fall

First, find volume of object
Put is water, and look for "displacement". How much water level changes.
THEN calculate for Density
D=m/v

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​Calculating Odd Shape Objects

​Determining the Volume of an irregular solid object =

​Final volume - Initial volume

​75 mL - 50 mL = 25 mL

Multiple Choice

What is the volume of Object X?

• 10.0 cm³
• 15.0 cm³
• 20.0 cm³
• 25.0 cm³

Multiple Choice

Which object has the highest density in this picture?

• A

• B

• C

Multiple Choice

Which object has the lowest density in this picture?

• A

• B

• C

Multiple Choice

What is the density of an object if it has a mass of 6g and a volume of 3cm³? (Hint: Density = mass/volume)

• 6 g/cm³

• 3 g/cm³

• 2 g/cm³

• 1/3 g/cm³

Multiple Choice

What is the density of an object with a mass of 3g and a volume of 1cm³? (Hint: Density = mass / volume)

• 1/3 g/cm³

• 3 g/cm

• 3 g/cm³

Multiple Choice

Frank has a paper clip. It has a mass of 9g and a volume of 3cm³. What is its density?

• 3 g/cm³
• 1/3 g/cm³
• 27 g/cm³
• 39 g/cm³

Multiple Choice

Which box has a higher density?  

• Box A
• Box B
• cannot be determined
• they are the same

Multiple Choice

What is the volume of the fish?

• 18.0 ml

• 6.0 ml

• 38.0 ml

Multiple Choice

An irregularly shaped piece of gold was lowered into a graduated cylinder holding a volume of water equal to 17 ml. The height of the water rose to 20 ml. If the mass of the gold was 27 g, what was its density?

• 9 g/mL
• 10.5 g/mL
• 6.5 g/mL
• 8 g/mL

Multiple Choice

How much water has been displaced in the image shown?

• 40 mL
• 65 mL
• 20 mL
• 25 mL

Multiple Choice

A block of aluminum occupies a volume of 15 cm³ and has a mass of 40.5 g. What is its density?

• .37 g/mL

• 605.5 g/mL

• 2.7 g/mL

• 25.5 g/mL

Multiple Choice

What is the formula for density?

• density = mass x volume
• density = mass / volume
• density = mass + volume
• density = mass - volume

Explanation Slide...

Remember: Density = Mass/Volume

Multiple Choice

A block has a mass of 54g and a volume of 20cm3. What is the density of the block?

• 74 g/cm3

• 1080 g/cm3

• 34 g/cm3

• 2.7 g/cm3