thermal

Question 1

how is thermal energy transferred in metal? 3 steps
what is this method of transferring energy called

Answer 1

ion hits delocalised electrons
electrons propelled
electrons hit distant atoms
conduction

Question 2

what is si unit in temp?

Answer 2

kelvin K

Question 3

equation to get temp as K

Answer 3

K = temp in celcius = 273

Question 4

what is boyles law

Answer 4

P1XV1= P2V2

Question 5

when do we use boyles law?

Answer 5

to find volume or pressure when you have the other 3

Question 6

how does increasing temp cause expansion?

Answer 6

molecules move faster due to higher average KE and push each other apart

Question 7

why do gases expand the most?

Answer 7

due to the weakest molecular bonds

Question 8

simply what is heat and what is temp

Answer 8

temp is related to average kinetic energy
heat is a form of energy

Question 9

what is specific heat capacity?

Answer 9

amount of heat required to change the temperature by 1c for a mass of 1kg

Question 10

how to get specific heat capacity

Answer 10

c = Q/ mΔT

Question 11

why are there flat parts in heating or cooling curve when substance physical state is changing

Answer 11

temp (average Ke) is no longer being increased and the energy is being used to break the bonds between the molecules instead of inc KE

Question 12

6 diff about boiling and evaporation

Answer 12

boiling
occurs at fixed temp
bubbles
quick
temp remains constant
takes place throughout the liquid
thermal energy supplied by an energy source
evaporation
occurs at any temp
slow process
no bubbles
occurs at surface of the liquid only
temp may change of the liquid
heat supplied by surroundings

Question 13

how to inc evaporation and why it incs it

Answer 13

increase temp so more particles have enough energy to escape
increase surface area more molecules are closer to surface area
reduce humidity less particles are condensing
blow air it helps removing before they can return to liquid

Question 14

how do non metals transfer heat by conduction

Answer 14

atoms vibrate faster and pass vibrations to adjacent atoms

Question 15

in what medium/thin g does convection happen

Answer 15

fluids

Question 16

what happens in convection? 3

Answer 16

• As a fluid (liquid or gas) warms up,
  the particles which are warmer
  become less dense and rise.
• They then cool and fall back to the
  heat source, creating a cycle called
  Convection current.
• As particles circulate they
  transfer energy to other particles.

Question 17

what is thermal radiation

Answer 17

mainly infra-red waves but very hot things can give out light waves

Question 18

3 factors affecting thermal radiation

Answer 18

temp of object hotter = more radiation
colour of object black = more radiation
surface area more sc = more area for radiation to emit from

Question 19

what does energy tranferred Q =?

Answer 19

m c ΔT