Particle Model of Matter

Question 1

How do you work out internal energy?

Answer 1

Internal energy = kinetic energy + potential energy

Question 2

Give 3 ways to check if a physical change has occured

Answer 2

The reaction is reversible
The mass of the products = the mass of the reactants
(mass is conserved)
No new substances have been formed

Question 3

Displacement method

Answer 3

Measure the volume of the displaced water.

Question 4

What is specific Latent heat of FUSION

Answer 4

SOLID —> Liquid

Question 5

What is specific Latent heat of EVAPORATION

Answer 5

Liquid —> Gas

Question 6

suggest why it is better to calculate the specific heat capacity at a change of temperature of 80degrees instead of 50degrees

Answer 6

largest possible range reduces percentage error

Question 7

heating a substance increases its

Answer 7

INTERNAL ENEGERY!

Question 8

the total potential energy of molecules in hot water

Answer 8

is the same as the total potential energy of molecules in cold water

Question 9

compare the specific heat capacity of hot water with cold water

Answer 9

the specific heat capacity for hot water is the SAME as for cold water

Question 10

describe how the arrangement of particles in a gas is different from that in a solid

Answer 10

solid: arranged in a regular pattern
gas: moving in random direction

Question 11

how can we observe a physical change

Answer 11

reaction is reversible