Using the Density Equation

Scope 4 Density Notes

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When the object has regular sides, you need to measure the sides and use the formula

V= L x W x H

Regular Objects

When the object does not have sides that you can easily measure, you need to use the water displacement method.

Irregular Object

Multiple Choice

What is volume?

• the amount of space taken up by an object

• the amount of mass in a certain space

• the amount of matter in an object

Multiple Choice

How do we measure volume?

• water displacement

• V= L x W x H

• Both A and B

• Neither A or B

Multiple Choice

What tool do we use to measure volume of an irregular object?

• triple beam balance

• pipette

• graduated cylinder or beaker

• ruler

Multiple Choice

Which of the following are key when reading a graduated cylinder?

• the cylinder must be on a flat surface

• you must read the bottom of the meniscus

• you have to be eye level when reading the water level

• all of the above

• Take an initial reading on the cylinder

• Take the mass of an irregular object and add it to the cylinder

• Read the new level on the cylinder.

• The difference is the volume ​of the irregular object

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How to use Water Displacement

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Multiple Choice

What is the volume of the irregular object when you use teh water displacement method?

• the initial volume

• the final volume

• the difference between the initial and final volume

• just get a ruler and measure the length, height and width

Multiple Choice

What is the volume of the irregular object?

• 2 mL

• 4 mL

• 65 mL

• 69 mL

Multiple Choice

What is the volume of the regular object?

• 10 cm³

• 15 cm³

• 20 cm³

• 40 cm³

Multiple Choice

What is mass?

• the amount of space taken up by an object

• the amount of mass in a certain space

• the amount of matter in an object

Multiple Choice

What do we use to measure the mass of an object?

• scale

• ruler

• triple beam balance

• spring scale

Multiple Choice

What is the unit used for mass?

• ounces

• pounds

• miligrams

• grams

• ​Place the object on the scale

• Move the 100s slide (the largest one) first

• Once that is too much, then move it back a click and move the 10s slide

• Finally, use the 1s slide to fine tune the exact mass​

How to use Triple Beam Balance

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Multiple Choice

What is the mass shown in the picture?

• 202002 g

• 222 g

• 202 g

• 200 g

Density is the amount of matter in a given space or volume.

The unit used to measure density is g/cm³ or g/mL

​Find density using the formula D=M/V

The density of

water is 1 g/mL​

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Multiple Choice

What is density?

• the amount of space taken up by an object

• the amount of mass in a certain space

• the amount of matter in an object

Multiple Choice

What is required to find density?

• mass

• volume

• both

• you can find it without either of the other two

• ​Particles are closer together

• Less space between

• Typically sink- density is higher than the liquid it is in​

High Density

• Particles are more spread out

• More space between

• Typically float- density is lower than the liquid it is in​

Low Density

• Tool to help you remember your formulas

• ​M= D x V

• D= M/V

• V= M/D ​

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Density- Mass- Volume Triangle

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Multiple Choice

An object has a mass of 20 g and a volume of 10 mL. What is the density of the object?

• 200 g/mL

• 20 g/mL

• 2 g/mL

• 0.2 g/mL

Multiple Choice

If the object has a mass of 4 g and a volume of 8 mL, will the object do if added to water?

• Float

• Sink

• Not enough information

Multiple Choice

If an object has a mass of 15 g and a volume of 5 mL, will the object float or sink if the density of the liquid it is added into has a density of 1.5 g/mL?

• Float

• Sink

• Not enough information

Multiple Choice

Which of the following is the most dense?

• milk

• lamp oil

• corn syrup

• water

Multiple Choice

Which of the following is the least dense?

• honey

• water

• vegetable oil

• corn syrup

• Ice

• ​Food

• Balloons​

• Airplanes

• Boats

• Oil spills

We use density all the time!

​Why do we need to know this?

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