REVIEW DENSITY GRADE 7

Multiple Choice

Density is ____

• the amount of mass in an object

• the amount of mass in a given space

• the amount of space an object takes up

• the weight of an object

Multiple Choice

Calculate the density of the cube.

• 2 g/cm³
• 4 g/cm³
• 6 g/cm³
• 8 g/cm³

Multiple Choice

Show all your work on your answer document. D=m/v

• 0.33 g/cm³

• 15 g/cm³

• 3 g/cm³

• 9 g/cm³

Multiple Choice

Show all your work on your answer document. D=m/v

• 0.5 g/cm³

• 6 g/cm³

• 2 g/cm³

• 4 g/cm³

Multiple Choice

Show all your work on your answer document. D=m/v

• 0.5 g/cm³

• 8 g/cm³

• 2 g/cm³

• 4 g/cm³

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

An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 200 ml. The height of the water rose to 280 ml. If the mass of the stone was 240 g, what was its density?

• 3 g/mL
• 4 g/mL
• 2 g/mL
• 5 g/mL

Multiple Choice

An irregularly shaped rock was lowered into a graduated cylinder holding a volume of water equal to 50 ml. The height of the water rose to 75 ml. If the mass of the stone was 250 g, what was its density?

• 15 g/mL
• 5 g/mL
• 10 g/mL
• 20 g/mL

Multiple Choice

What scientific device would be used to measure the volume of an irregular object?

• beaker

• scale

• graduated cylinder

• triple beam balance

Multiple Choice

If water has a density of 1 g/cm³, what would an object with a density of 1.5 g/cm³ do in water?

• sink

• float

• I don't know

The different densities of objects determines if it will sink or float in water.

​

Higher density than water will SINK!

Lower density than water will FLOAT!

​

The density of water is defined as 1 gram / milliliter³​

​What makes objects sink or float?

​

Multiple Choice

Calculate the density of a rock with the mass of 108 grams and a volume of 12 cm³.

• 9 g/cm³

• 0.11111 cm³/g

• I have no idea!

• 19 g/cm³

One way would be to put the object in liquid that is inside a graduated cylinder. The liquid in the cylinder will rise the same amount as the volume of the object.

​

Subtract the final liquid volume reading from the starting volume reading to find the volume of the object.​

Science tool definition: A graduated cylinder is a tall narrow cylinder with markings used to measure volume of liquids!

​So, then, how do you measure the volume of an irregular shaped object?

​

Rectangular objects - calculate volume by using the formula:​

​

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

Calculate the volume of a block that is 5 m long, 6 m wide, and 2 m high.

• 10 m³

• 30 m²

• 60 m³

• 120 m³

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

​

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

​What is volume?

​

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

​

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

​

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

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

What is the formula for density?

• density = mass x volume

• density = mass / volume

• density = mass + volume

• density = mass - volume

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

What is the volume of the rock?

• 30cm³

• 10cm³

• 40cm³

• 20cm³

Multiple Choice

What is the volume of Object X?

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

Multiple Choice

If a block of wood has a density of 0.6 g/cm³ and a mass of 120 g, what is its volume?

• 200 cm³

• 0.005 cm³

• 200.0 ml

• 72 ml

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

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 units of measurement are used for volume?

• grams

• centimeters

• grams/milliliter

• milliliter