P6

Question 1

What is density ?

Answer 1

How closely packed the particles are in a solid, liquid or gas.

Defined as its mass per unit volume

Question 2

What is the equation for density ?

Answer 2

Density (p) = mass, (m) (kg) / volume (m3)

Question 3

How do you measure the density of irregular solids ?

Answer 3

Lower the solid into a measuring cylinder / eureka can with thread or by hand then measure the water rise / loss

Question 4

What is conservation of mass ?

Answer 4

When a substance changes state, the number of particles in the substance stays unchanged So the mass of the substance after the change of state is the same as before

Question 5

What happens to a pure substances’s temperature undergoing a change of state

Answer 5

The temperature stays the same while the change of state is taking place

Question 6

What happens to a pure substances’s temperature undergoing a change of state

Answer 6

The temperature stays the same while the change of state is taking place

Question 7

What is latent heat ?

Answer 7

The energy transferred to a substance when it changes its state

Question 8

What is internal energy ?

Answer 8

The energy stored by the particles of a substance

Question 9

What is internal energy ?

Answer 9

The energy stored by the particles of a substance

Question 10

The internal energy of the particles is the sum of…

Answer 10

• The kinetic energy they have due to motion of individual particles
• The potential energy the particles have due to their position

Question 11

How do you calculate specific latent heat of fusion/vaporisation ?

Answer 11

Specific latent heat (L) (J/kg) = Energy (J) / mass (kg)