2.4 Density Calculations

Density Calculations
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Slide 1: Slide
Natuurkunde / ScheikundeMiddelbare schoolvwoLeerjaar 2

This lesson contains 13 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Density Calculations

Slide 1 - Slide

Which answer is false?
Density is:
A
property of a substance
B
volume/mass
C
mass/volume
D
mass in grams of substance per cubic centimetre

Slide 2 - Quiz

Remember?
density = mass/ volume
mass (m) in grams (g)
volume (V) in cubic centimetre (cm3)
density (p) in grams per cubic centimetre (g/cm3)

Slide 3 - Slide

Slide 4 - Slide

mass

1 kg = 1000 g
1 g = 1000 mg
40 mg = 0.04 g

kg --> g (x 1000)
mg --> g ( divide by 1000)
Volume
1 dm3 = 1000 cm3
1 L = 1000 mL 
40 mL = 0.04 L



L --> mL (x 1000)
mL --> L (divide by 1000)
1 mL = 1 cm3
1 L = 1 dm3

Slide 5 - Slide

Question
Calculate the density
Use G.A.F.C.A
G = given
A= Asked
F= Formula
C = Calculation
A = Answer


Slide 6 - Slide

Answer
G: m = 200 g
l = 6 cm; w = 4 cm; h = 5 cm
A: density
F: density = mass/volume
C: V = l*w*h= 6 x 4 x 5 = 120cm3
density = 200 g / 120 cm3
A: density = 1.7 g/cm3

Slide 7 - Slide

Calculate the density

Slide 8 - Open question

Answer
G: mass = 324 g
l = 4 cm; w = 3 cm; h = 10 cm
A: density
F: density = mass/volume
C: V needs to be calculated first: V = l*w*h
V = 4 x 3 x 10 = 120 cm3
density = 324 g/ 120 cm3 = 2.7 g/cm3
A: The density of the block is 2.7 g/cm3

Slide 9 - Slide

The label of a bottle of syrup says:
0.75L | 850 g
What is the density of the syrup?

Slide 10 - Open question

Answer
G. m = 850 g; V = 0.75 L
A. density
F. density = mass / volume
C. V = 0.75 L ; you have to convert this to cm3
V = 0.75 L = 750 mL = 750 cm3
density= 850 g/ 750 cm3
A. density = 1.13 g/cm3

Slide 11 - Slide

Question
Lisa has a rock and wants to determine the density. She uses a measuring cilinder. She starts with 50 mL water in the cilinder. After adding the rock, the water has risen to 58 mL.
The mass of the rock is 40 gram.
Calculate the density.

Slide 12 - Slide

Answer
G. Vbegin = 50 mL; Vend = 58 mL
m = 40 g
A. density
F. density = mass / volume
C. You have to find V first: V = Vend - Vbegin
V = 58 mL - 50 mL = 8 mL   8mL = 8 cm3
density = m / V = 40 g / 8 cm
density = 5 g/cm3

Slide 13 - Slide