Water - Heat capacity & latent heat

Question 1

what is heat capcity

Answer 1

the amount of heat energy tthat can be held by a subtance

Question 2

SHC stands for

Answer 2

specific heat capacity

Question 3

specific heat capacity

Answer 3

the measure of the amount of heat energy needed to increase the tempetaure of 1g of a substance by 1 degree celcius

Question 4

specific heat capacity unit

Answer 4

J g -1 °C -1

Question 5

specific heat capacity of water

Answer 5

4.18 J g -1 °C -1

Question 6

worded formula to calculate heat energy of a substance

Answer 6

mass x SHC x change in temperature

Question 7

symbol formula to calculate heat energy of a substance

Answer 7

q = mcΔT

Question 8

what substance is the only subtance commonly found as a liquid, gas and solid

Answer 8

water

Question 9

what does specific heat capcity reflect in molecules

Answer 9

the type of bonding in the subtsnace

Question 10

latent heat is aka

Answer 10

hidden heat

Question 11

latent heat value

Answer 11

the enrgy needed to change the state of a substance at its boiling point or melting point

Question 12

two latent heat values

Answer 12

latent heat of fusion and latent heat of evaporation

Question 13

latent heat of fusion

Answer 13

the amount of energy required to change a fixed amount of water from solid to liquid at 0°C

Question 14

latent heat of evaporation

Answer 14

the amount of energy required to change a fixed amount of water from liquid to gas at 100 °C

Question 15

when water moves from a liquid to solid/gas to solid/gas to liquid, what happened to latent heat

Answer 15

it is released

Question 16

whe water moves from solid to gas/liquid to gas/ solid to liquid what happened to latent heat

Answer 16

it is absorbed

Question 17

when is there no temperature change in a substance

Answer 17

while a phase change is occuring

Question 18

latent heat of fusion of water is

Answer 18

6.0 KJ mol -1

Question 19

latent heat of vaporisation of water is

Answer 19

40.7 KJ mol -1

Question 20

latent heat unit

Answer 20

KJ mol -1

Question 21

worded equation for the amount of heat energy required forr a state change

Answer 21

heat energy (KJ) = moles (mol) x latent heat value of vaporisation/fusion (KJ mol -1)

Question 22

formula equation for the amount of heat energy required forr a state change

Answer 22

q = n x L

Question 23

what makes water such an effective coolant

Answer 23

its high specific heeat capacity and latent heat

Question 24

during a state change what is happening

Answer 24

the temperature of the substnace remains constant but it is still absorbing energy