6.3.1.1 Density of Materials

Question 1

What is the equation for density?

Answer 1

• density = mass / volume

Question 2

What is density measured in?

Answer 2

• kilograms per metre cubed
• kg/m3

Question 3

What is mass measured in?

Answer 3

• kilograms
• kg

Question 4

What is volume measured in?

Answer 4

• metres cubed
• m3

Question 5

What can the particle model be used to explain?

Answer 5

• different states of matter
• differences in density

Question 6

Why do solids and liquid have similar densities?

Answer 6

• space between particles does not change significantly
• usually liquids have a lower density than solids (other than ice and water)

Question 7

Why do gases have far lower densities?

Answer 7

• spacing between atoms increase by 10x as particles have lots of energy to move
• volume greatly increases so density increases

Question 8

How do you measure density of a regularly shaped object?

Answer 8

• measure mass using a balance
• measure length, width and height using a ruler
• calculate the volume
• use the density equation to calculate density

Question 9

How do you measure density of an irregularly shaped object?

Answer 9

• measure the mass using a balance
• fill a eureka can with water
• place the object in the water, water displaced by object will transfer into measuring cylinder
• measure volume of water
• use the density equation to calculate density