internal energy and energy transfers

Question 1

what is the internal energy of a substance

Answer 1

. the energy stored by the particles
.the sum of the total kinetic and potential energies that make up the system

Question 2

how does heating affect the energy of a substance

Answer 2

.heating transfers energy to the substance
. it increases the energy of the particles that make up the particles

Question 3

what 2 things can heating a substance do

Answer 3

. raise its temperature
.change the state of the substance
.

Question 4

what 3 factors determine the temperature change of a system

Answer 4

. mass of substance being heated
.type of material
.energy inputted into the system

Question 5

state the equation used to calculate the temperature when a substance is heated

Answer 5

AE=m c A0

.energy=J
.mass=kg
.specific heat capacity= J/kg
.temperature= C

Question 6

define specific heat capacity

Answer 6

the amount of energy needed to increase the temperature of 1kg of a substance by 1.c

Question 7

describe how the internal energy and temperature of a substance changes when a change of state occurs

Answer 7

. the internal energy of the substance will be increased or decreased
.the temperature of the substance will remain constant

Question 8

define specific latent heat

Answer 8

the amount of energy needed to change the state of 1kg of a substance with no change in temperature

Question 9

state the equation for the energy required to change state

Answer 9

energy to change state= mass x specific latent heat

.energy= J
.mass=kg
.specific latent heat= J/kg

Question 10

what is the specific latent heat of fusion

Answer 10

the energy required to change 1kg of a substance from solid state to liquid state without a change in temperature.

Question 11

what is the specific latent heat of vaporisation

Answer 11

the energy required to change 1kg of a substance from liquid state to gas state , without a change in temperature