1. Density: 1. Which is more dense, water or wood? How do you know?
1 pound of lead or 100 pounds of lead?
Wood, if it sinks in water.
Water, if the wood floats.
SAME! because… 1

2. Density: m V D = rise run mass volume slope = ratio of mass to volume
If you have lots of mass, but little volume (very dense) If little mass, but lots of volume (not dense)
rise
run
mass
volume
slope =

3. Density depends only on the substance, not the size of the sample.
1 piece Aluminum
D = 2.70 g/cm3
2 equal pieces Aluminum
D = ??? g/cm3
1 ton of lead of 1 lb of lead is same density, both sink same with balsa wood, both float
D = 2.70 g/cm3
Density depends only on the substance, not the size of the sample.

4. MUST write what’s in blue for work
Calculating Density
A copper block has a mass of 42.7 g.
What is the density of copper?
MUST write what’s in blue for work
H = 1.9 cm m V
W = 1.1 cm
D =
L = 2.3 cm
V = L x W x H
D = g
V = (2.3)(1.1)(1.9)
4.8 cm3
V = 4.8 cm3
D = 8.9 g/cm3

5. MUST write what’s in blue for work
Calculating with Density
A cup of llama snot has a volume of 100. mL,
and a density of 1.58 g/mL.
What is the mass of the llama snot? m V
MUST write what’s in blue for work
D =
equation
1.58 = m .
100.
#’s sub in
(1.58)(100.) = m
boxed answer
m = g 5

6. MUST write what’s in blue for work
equation
Calculating with Density
What is the volume of 425 g of a solution with a density of 17.5 g/mL ? m V
D =
#’s sub in
17.5 = V
MUST write what’s in blue for work
(17.5)V = 425
V =
boxed answer
V = 24.3 mL 6

7. Quick Quiz!
Quiz - Density