Density Unit Review_T

Density

Unit Review

Density, States of Matter, Water Cycle, Physical and Chemical Changes, and Mystery Objects!

Review - Measuring Matter

• Mass is the amount of matter in an object. We measure mass using a scale, and the units are grams (g).

• Volume is the amount of space an object takes up. We measure volume with a graduated cylinder, and the units are milliLiters (mL).

• Density is the amount of mass in a specific volume. We measure density using a calculator, and our units are g/mL.

Match

Match the property to its definition.

• Mass

• Volume

• Density

Amount of matter in an object

Amount of space an object takes up

Amount of mass in a specific volume

• Amount of matter in an object

• Amount of space an object takes up

• Amount of mass in a specific volume

Match

Match the property to its description.

• Mass

• Volume

• Density

How heavy it feels

How big it looks

How closely packed the particles are

• How heavy it feels

• How big it looks

• How closely packed the particles are

Match

Match the property to its measurement tool.

• Mass

• Volume

• Density

Scale

Graduated Cylinder

Calculator

• Scale

• Graduated Cylinder

• Calculator

Match

Match the property to its units.

• Mass

• Volume

• Density

grams (g)

milliLiters (mL)

grams per milliLiter (g/mL)

• grams (g)

• milliLiters (mL)

• grams per milliLiter (g/mL)

Dropdown

The baseball has ​​

Select answer

density than the rubber ball because it has more ​

Select answer

but the same ​

Select answer

​ .

Dropdown

The foam ball has ​

Select answer

density than the marble because it has more ​

Select answer

but the same ​

Select answer

.

Dropdown

Does this box have high or low density?

"I think this box has ​

Select answer

density because ​

Select answer

."

Dropdown

Does this box have high or low density?

"I think this box has ​​

Select answer

density because ​​

Select answer

."

Review -

States of Matter

• Water's Density changes as temperature changes.

• A solid is the most dense because the particles are very packed together.

• A gas is the least dense because the particles are very spread apart.

Match

Match the states to the examples.

• Solid

• Liquid

• Gas

Ice

Water in the Ocean

Water Vapor

• Ice

• Water in the Ocean

• Water Vapor

Match

Match the state of matter to the diagram.

Gas

Solid

Liquid

• Gas

• Solid

• Liquid

Multiple Choice

We can change the state of matter by changing the ____.

• Clocks

• Temperature

• Age

Reorder

Order the states of matter from coldest (1) to hottest (3).

• Solid

• Liquid

• Gas

1

2

3

• 1
• 2
• 3

Match

Match the following

Solid

Liquid

Gas

• Solid

• Liquid

• Gas

Review -

The Water Cycle

• We have been discussing the water cycle, which describes how water moves from Earth's surface to the atmosphere, and back again.

• The sun heats the water, which spread out and rises to the atmosphere, where it cools and sinks back to Earth.

Dropdown

When the Sun shines on the ocean, the water particles ​

Select answer

and​

Select answer

.

When the vapor touches the atmosphere, the water particles ​

Select answer

and ​

Select answer

.

Dropdown

Water vapor particles are more ​

Select answer

than liquid ocean water, so we would say the water vapor is ​

Select answer

dense.

Drag and Drop

Rain particles are more ​

Placeholder

than water vapor.

So, rain particles are ​

Placeholder

than water vapor.

Drag these tiles and drop them in the correct blank above

packed together

more dense

spread out

less dense

Reorder

Sequence these events in the water cycle.

• START: The sun heats the liquid water.

• Water vapor expands and rises to the atmosphere.

• The atmosphere cools the vapor.

• The vapor packs together to form clouds.

• Gravity pulls the water back to Earth's surface.

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Float or Sink?

• We often compare an object's density to water.

• Water has a density of 1 g/mL.

• Matter with less density will float.

• Matter with more density will sink.

Match

Match the following

• 1.0

• 10.

• 0.1

Equal to 1

Greater than 1

Less than 1

• Equal to 1

• Greater than 1

• Less than 1

Dropdown

Matter with a density greater than 1 will ​

Select answer

in water,

but matter with a density less than 1 will ​

Select answer

in water.

Dropdown

This object ​ ​

Select answer

in water,

so we know its density is ​

Select answer

.

Dropdown

This object ​​

Select answer

in water,

so we know its density is ​

Select answer

.

Review - Physical and Chemical Changes

• Matter can change physically, when it changes in size, shape, or state.

• Physical changes do not make a new substance.

• Matter can change chemically when a new substance is formed.

• You can often "undo" a physical change, but you cannot undo most chemical changes.

Drag and Drop

Changing the size, shape, or state is ​

Placeholder

, but changing what matter is made of is ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

physical

chemical

Dropdown

We cannot undo a ​

Select answer

change, but we can usually undo a ​

Select answer

change.

Dropdown

A ​

Select answer

change ends with the same substance, but a ​

Select answer

change ends with a different substance.

Multiple Choice

Which one can we undo?

• Physical Change

• Chemical Change

Multiple Choice

I slice the bread into pieces, but it is still bread. This change is ____.

• Chemical

• Physical

Multiple Choice

I put dough in an oven and take out bread. This change is ____.

• Chemical

• Physical

Multiple Choice

In my stomach, the mint is broken down to make glucose. This change is ____.

• Chemical

• Physical

Multiple Choice

I chew on a lifesaver. The mint breaks in half, but it is still a mint. This change is ____.

• Chemical

• Physical

Changing Size

• When we cut an object in half, we decrease its volume because it takes up less space.

• But, we also decrease the mass because the smaller piece feels lighter.

• When we change the size of an object, we do not affect the object's density. The density stays the same.

Dropdown

If I cut an object in half:

The volume decreases because ​

Select answer

.

The mass decreases because ​

Select answer

.

Drag and Drop

When I cut an object in half, the density ​

Placeholder

change because ​the particles are ​

Placeholder

packed together.

Drag these tiles and drop them in the correct blank above

does not

does

more

equally

less

Multiple Choice

If a physical change affects only an object's size, will the density change?

• Yes

• No

Multiple Choice

I slice a log into pieces.

This is a physical change because ___.

• I changed the size.

• I changed the state.

• I made a new substance.

Multiple Choice

I slice a log into pieces.

If the density of the log is 0.4 g/mL, the density of each slice will be ___.

• More than 0.4 g/mL

• Less than 0.4 g/mL

• Equal to 0.4 g/mL

Multiple Choice

I slice a log into pieces.

If the log floats, I predict the slices will ___.

• Float

• Sink

Mystery Objects

• When we change the size of an object, we do not affect the object's density. The density stays the same.

• Scientists have a list of the density of most objects.

• If we have a mystery object, we can identify it by calculating its density.

Multiple Choice

How can scientists figure out what a mystery object is made of?

• By finding the mass

• By finding the volume

• By finding the density

Multiple Choice

I have a mystery object with a density of 2.70 g/mL.

What is it made of?

• Aluminum

• Copper

• Gold

• Iron

• Lead

Multiple Choice

Copper has a density of 8.94 g/mL, so it sinks in water.

I throw a mystery object in water and it floats.

Could it be made of copper?

• Yes!

• No!

Multiple Choice

Copper has a density of 8.94 g/mL, so it sinks in water.

I throw a mystery object in water and it sinks.

Could it be made of copper?

• Yes!

• No!