P6 - Molecules and Matter

Question 1

What is density?

Answer 1

-The density of a substance is defined as its mass per unit volume.

Question 2

How do you calculate density?

Answer 2

-Mass / volume

Question 3

What is the law of conservation of mass?

Answer 3

-When a substance changes state, its mass stays the same because the number of particles stays the same.

Question 4

What is internal energy?

Answer 4

-Kinetic energy + potential energy

Question 5

What is the specific latent heat of fusion?

Answer 5

-The specific latent heat of fusion (LF) of a substance is the energy needed to change the state of 1kg of a substance from solid to liquid, at its melting point

Question 6

What is the specific latent heat of vaporisation?

Answer 6

-The specific latent heat of vaporisation (LV) of a substance is the energy needed to change the state of 1kg of a substance from liquid to gas, at its boiling point.

Question 7

How do you work out pressure?

Answer 7

-Force / area

Question 8

What is the Brownian motion?

Answer 8

-Random movement of tiny particles in a fluid.

Question 9

What does pressure x volume equal?

Answer 9

-Constant