temperature

Question 1

how is thermal energy transferred

Answer 1

from region of higher temperation to region of lower temperature

Question 2

define thermal energy

Answer 2

the energy possessed by an object due to its temperature

Question 3

what happens at thermal equilibrium

Answer 3

the regions have equal temperature
meaning no thermal energy transfer

Question 4

what are the physical properties that can be used to measure temperature

Answer 4

1. liquid density
2. volume of a gas at constant pressure
3. resistance of a metal
4. e.m.f of thermocouple

Question 5

define specific heat capacity

Answer 5

the thermal energy required to raise the temperature of 1 kg of a substance by 1 degree

Question 6

formula of thermal energy

Answer 6

∆Q = mc∆T

Question 7

does scale of thermodynamic temperature depend on the property of any particular substance

Answer 7

no

Question 8

what is absolute zero

Answer 8

0 K or -273 C, lowest possible energy

Question 9

describe the curve of heating

Answer 9

1. rise initially
2. reaches melting point, no rise of temp despite thermal energy absorbed
3. rise continuously
4. reaches boiling point, no rise of temp despite thermal energy
5. rise endless

need to know the graph

Question 10

define specific latent heat

Answer 10

the thermal energy required to change the state of 1unit mass of a substance without changing any temperature

Question 11

what are the 2 types of specific latent heat

Answer 11

1. latent heat of fusion (melting)
2. latent heat of vaporisation (boiling)

Question 12

what is the difference between latent heat and specific latent heat

Answer 12

specific refers per mass

Question 13

equation for latent heat

Answer 13

Q = Lm

L: specific latent heat
m: mass

Question 14

why does latent heat of vaporisation always higher than fusion

Answer 14

to change from solid to liquid, there is only more space of separation.
to change from liquid to gas, the intermolecular bonds are destroyed