Physic1 11-20

Question 1

11 What is a chemical change?

Answer 1

A change in which chemical bonds are
broken and reformed to form new products.

Question 2

12 What is specific heat capacity?

Answer 2

The energy required to increase the
temperature of 1kg of a substance by 1oC

Question 3

13 What is Specific latent heat?

Answer 3

The energy required to change the state of
1kg of the substance with no change in
temperature.

Question 4

14 What is the difference between
the specific latent heat of fusion and
the specific latent heat of
vaporisation?

Answer 4

Fusion is the change from solid to liquid and
vaporisation is the change from a liquid to a gas

Question 5

15 What is shown by a flat section
on a temperature vs time graph
when heating a substance?

Answer 5

A change of state is taking place.

Question 6

16 When changing state why
doesn’t the temperature of a
substance increase?

Answer 6

As the energy is used to overcome the
intermolecular forces within the substance.

Question 7

17 How do particles move in gases
and liquids?

Answer 7

randomly

Question 8

18 How is the temperature of a gas
related to the average kinetic
energy of molecules?

Answer 8

The greater the temperature the more kinetic
energy carried by the particles.

Question 9

19 How does increasing
temperature affect the pressure
exerted

Answer 9

It increases the pressure applied by the gas
(assuming the volume stays constant).

Question 10

20 Why does pressure of a gas
increase with temperature in a
given volume?

Answer 10

Particles have more kinetic energy so move
faster and collide with the walls of the
container more frequently and more force.