Density

Question 1

Different samples of the same material have…

Answer 1

The same density

Question 2

What is the density of an object?

Answer 2

The density of an object is the mass divided by the volume.

Question 3

Each material has its own…

Answer 3

Density

Question 4

What does the density of a material tell you?

Answer 4

The density of a material tells you the mass of one cubic metre or one cubic centimetre of the material

Question 5

In a material with a high density the atoms are…

Answer 5

Closely packed together

Question 6

In a material with a low density the atoms are…

Answer 6

Farther apart

Question 7

Give the formula for finding the density of a material

Answer 7

Destiny = mass/volume

Question 8

What does the mass density volume triangle look like?

Answer 8

The mass density volume triangle =

              M
         --------
          D  |  V

Question 9

Mass = kg
Volume = m3
Density = ?

What is the unit for density?

Answer 9

Mass = kg
Volume = m3
Density = kg/m3

Question 10

Mass = g
Volume = cm3
Density = ?

What is the unit for density?

Answer 10

Mass = g
Volume = cm3
Density = g/cm3

Question 11

Explain how you would measure the density of a regular solid. (4 marks)

Answer 11

• measure the mass (m) of the solid and record the value
• measure its dimensions. Repeat measurements, average them and record them in a suitable table
• calculate the volume (v) of the sample
• calculate the density (d) of the sample using d=m/v

Question 12

Show how you would measure the density of an irregular solid with a labelled diagram. (5 labels + dashed line)

Answer 12

Labels:

• graduated measuring cylinder
• water
• thread
• increase in volume of liquid = volume of object
• object whose volume is to be measured
• dashed line

Question 13

Explain how you would measure the density of an irregular solid. (5 marks)

Answer 13

• measure the mass (m) of the solid using a balance and record the value
• fill the graduated cylinder with water up to one of the graduations and record the volume (v1)
• carefully lower the solid into the water and record the new volume (v2)
• calculate the volume of the solid using v=v2-v1
• calculate the density of the solid using d=m/v

Question 14

Explain how you would measure the density of water. (5 marks)

Answer 14

• use the balance to measure and record the mass (m1) of the dry empty graduated measuring cylinder
• fill the graduated cylinder with water up to one of the graduations and record this volume (v)
• use the balance to measure and record the mass (m2) of the graduated cylinder plus water
• calculate the mass (m) of water using m=m2-m1
• calculate the density (d) of water using d=m/v