Density

Density

•

The amount of mass in a given volume

Density = Mass ÷ Volume

•

All solids, liquids, and gases have density

•

The density of water is 1 g/mL

•

Objects that have a density greater than 1 g/mL
will sink in water

•

Objects that have a density less than 1 g/mL
will float in water

Dropdown

Objects with a density greater than 1 g/mL will ​

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in water and objects with a density less than 1 g/ml will​

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in water.

Dropdown

The formula for density is ​

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Open Ended

What are some examples of when a liquid would be more dense than a solid?

Open Ended

1. In what ways does the density of a gas differ from the density of a liquid?

Open Ended

1. How does the density of a solid compare to the density of a liquid?

Open Ended

1. How does kinetic energy affect the density of liquids compared to gases.

Open Ended

1. Explain a connection between states of matter and density.

Open Ended

1. Why do liquids typically have higher density than gases?

Density

Regular Shaped Objects

•Mass can be determined
using a triple beam balance
or an electronic scale

•Volume can be determined by
measuring and multiplying:
Length x Width x Height

•Examples of regular shaped
objects – tissue box, packing
box, cube

L x W x H

Multiple Choice

For regular shaped objects volume can be determined by measuring and multiplying..

• length x width x height

• length x width + volume

• length + width x density

• length + width + height

Density

Irregular Shaped Objects

•Mass can be determined
using a triple beam balance
or an electronic scale

•Volume can be determined
using water displacement
with a graduated cylinder

•Examples of irregular shaped
objects – rock or mineral,
jewelry, paperclip

Open Ended

Explain how to find the mass and volume of irregular shaped objects.

Relative Density

• Sinking and floating using water as a

reference point

• Fluids or objects with a lower density than

water will float in water

• Fluids or objects with a higher density

than water will sink in water

Drag and Drop

Fluids or objects with a lower density will ​

Placeholder

in water

Drag these tiles and drop them in the correct blank above

float

sink

swell

shrink

Other Fluids

• All fluids have a specific density

• Fluids will form layers when combined with

other fluids of different densities

• Some objects will float in certain fluids and

sink in others

• For example: Ice has a density of 0.92 g/cm3

and will float in water (1.0 g/mL), but will
sink in acetone (0.79 g/mL).

Density Column

Object

Density (g/mL)

Water

1.0 g/mL

Oil

0.92 g/mL

Syrup

1.42 g/mL

Coin

7.20 g/mL

Sponge

0.02 g/mL

Grape

1.25 g/mL

Key

7.90 g/mL

Oil

Water

Syrup

An example of a density column with various
solids and liquids is shown below. The density

of each object is listed on the data table.

Labelling

List the items in the density tower from less dense to more dense starting from the top.

Drag labels to their correct position on the image

water 1.0 g/mL

grape 1.25 g/mL

sponge 0.02 g/mL

Key 7.9 g/mL

syrup 1.42 g/mL

oil 0.92 g/mL

coin 7.20 g/mL

Checkpoint

• 5 checkpoint questions

• Discuss each question with a partner

• Write a complete answer to each

question on your notes page

Question 1

How do you

determine if an

object will sink or

float in water?

Question 2

What information

do you need in

order to calculate
the density of an

object?

Question 3

List 3 different

solid objects that
will sink in water.

Question 4

List one fluid that
will float on water
and one fluid that
will sink in water.

Question 5

The density of an
unknown liquid is

0.98 g/mL. Will
this liquid sink or

float in water?