Density Review

Density Review

Multiple Choice

What units can be used to express density?

• g/mL
• grams
• millimeters
• milliliters

Multiple Choice

What two types of measurements make up DENSITY? 

• Mass and Volume
• Temperature and Mass
• Grams and Centimeters
• Volume and Weight

Multiple Choice

Which units of measurement are used for volume?

• grams
• centimeters
• grams/milliliter
• milliliter

Density is the amount of mass inside of a volume.

The more mass (atoms) inside a space, the denser the object is.

What is density?

How can we find density?

To find density, we ALWAYS need to know two things:
- Mass (how many atoms are inside an object)
- Volume (how much space an object takes up)

Density calculation example

You find a rock in the yard that has a mass of 250 g and a volume of 50 mL. What is the density of the rock?

​Start with
the formula

Plug in mass and volume

Do the math & remember units!

Multiple Choice

What do we call the amount of atoms/matter an object contains?

• mass

• volume

• length

• weight

Multiple Choice

Mr. Trout wanted to ensure his textbooks weren't too heavy for his bookshelf.

Is he concerned about the mass or volume?

• mass

• volume

Multiple Choice

Ms. Edelen is trying to figure out how many beakers she can fit into her cabinet.

Is she concerned about mass or volume?

• mass

• volume

Multiple Choice

What do we call the amount of space an object takes up?

• mass

• volume

• length

• density

​Finding Mass

Mass is easy to find! Place the object on a scale. The units will be in some form of grams (g).

gram (g)
kilogram (kg)
milligram (mg)
...and so on

Finding Volume

Volume is a little trickier. Since most objects are weirdly shaped, we use water to find the volume.

liter (L)
kiloliter (kL)
milliliter (mL)
...and so on

Multiple Choice

Before adding a bolt, you notice the water level begins at 150 mL. After adding the object, the water level rises to 180 mL. What is the volume of the bolt?

• 180 mL

• 30 mL

• 150 mL

• 330 mL

Multiple Choice

Before adding a pebble, you notice the water level begins at 70 mL. After adding the object, the water level rises to 90 mL. What is the volume of the bolt?

• 90 mL

• 20 mL

• 70 mL

• 160 mL

Multiple Choice

Before adding a pebble, you notice the water level begins at 9 mL. After adding the object, the water level rises to 16 mL. What is the volume of the bolt?

• 9 mL

• 7 mL

• 16 mL

• 25 mL

Multiple Choice

What is the density of a liquid that has a mass of 27 g and a volume of 30 mL?

• 0.9 g/mL

• 3 g/mL

• 57 g/mL

• 810 g/mL

Multiple Choice

A rubber eraser has a mass of 4 g, and a volume of 2 cm³.

What is the density?

• 8 g/cm³

• 2 g/cm³

• 0.5 g/cm³

• 24 g/cm³

Multiple Choice

What is the mass of a liquid with a density of 5 g/mL and a volume of 25 mL?

• 125 g

• 5 g

• 5 g/mL

• 0.2 mL

​Remember how density works!

Anything that is MORE dense will sink under LESS dense things.
(and the other way around!)

Example:
If rock = 3.4 g/mL and water is 1 g/mL, the rock will SINK in water
If foam = 0.9 g/mL and corn syrup is 1.3 g/mL, the foam will FLOAT.

Multiple Choice

Look at this image.  Which object has the LOWEST density in water? How? 

• The Ping Pong Ball because it floats to the top 
• The bolt because it has sunk to the bottom
• The soda cap because it is not just full of air like the Ping Pong ball

Multiple Choice

Which liquid is the most dense?

• corn syurp
• water
• glycerine
• corn oil