Particle model of matter

Question 1

Describe the method for measuring the density of a regularly shaped object.

Answer 1

• Measure the mass using a balance.
• Measure the length, width and height using a ruler.
• Calculate the volume.
• Use the density (p = m/V) equation to calculate density.

Question 2

Describe the method for measuring the density of an irregular shaped object.

Answer 2

• Measure the mass using a balance.
• Fill a eureka can with water.
• Place the object in the water
• The water displaced by the object will transfer into a measuring cylinder.
• Measure the volume of the water. This equals the volume of the object.
• Use the density (p = m/V) equation to calculate density.

Question 3

What is density?

Answer 3

A measure of how much mass there is in a given space.

Question 4

Describe solids.

Answer 4

Solids have strong forces of attraction. They are held together very closely in a fixed, regular arrangement. The particles do not have much energy and can only vibrate.

Question 5

Describe liquids.

Answer 5

Liquids have weaker forces of attraction. They are close together, but can move past each other. They form irregular arrangements. They have more energy than particles in a solid.

Question 6

Describe gases.

Answer 6

Gases have almost no forces of attraction between the particles. They have the most energy and are free to move in random directions.

Question 7

What is latent heat?

Answer 7

The energy needed to change the state of a substance.

Question 8

What is specific latent heat?

Answer 8

The amount of energy needed to change 1kg of a
substance from one state to another without changing the temperature.