““The Density The Density Equation”Equation”

Mass (g)

Volume (mL or cm3)

Density (g/mL or

g/cm3)

LiquidLiquid -- graduated cylinder

•Read at the meniscus

Regular Solid -Regular Solid - L x W x H L x W x H = = cmcm33

Irregular Solid -Irregular Solid - displacementdisplacement

Let’s Practice…Let’s Practice…If the mass of an object If the mass of an object is 6 grams and the is 6 grams and the volume is 3 mL, what is volume is 3 mL, what is the density of the object?the density of the object?

Step 1Step 1 Step 2 Step 3 Step 2 Step 3Step 4Step 4

m =

V =

D =

D = m 1 V

D = 6g 3mL

D = 2 g/mL

6g3mL?

Let’s Practice…Let’s Practice…If the density of an If the density of an object is 2 g/mL and object is 2 g/mL and the volume is 4 mL, what the volume is 4 mL, what is the mass of the object?is the mass of the object?

Step 1Step 1 Step 2 Step 3 Step 2 Step 3Step 4Step 4

m =

V =

D =

m = 8 g/mL

?

4mL2 g/mL

Let’s Practice…Let’s Practice…If the density of an If the density of an object is 5 g/mL and the object is 5 g/mL and the mass is 15 g, what is the mass is 15 g, what is the volume of the object?volume of the object?

StepStep 1 1 Step 2 Step 3 Step 2 Step 3Step 4Step 4

m =

V =

D =

V = 1 mL15g?

15 g/mL

1. If the mass of an object is 20 g and the volume of the object is 50 cm3, what is the density? Will it sink or float in H2O?

2. If the mass of an object is 12 g and the dimensions are 2cm x 2cm x 3cm, what is the density of the object?

3. What is the mass of an object with a volume of 2 cm3 and a density of 6 g/cm3?

4. What is the volume of a object with a mass of 24 g and a density of 8 g/mL?