Specific Latent Heat Flashcards
Particle Model of Matter (14 cards)
What is required for a change of state in a substance?
Energy
Energy is used to break bonds between particles during processes such as boiling and melting.
What happens to internal energy when a substance is boiling or melting?
It increases
The energy is used to break bonds rather than raising temperature.
What is the energy called that is needed to change the state of a substance?
Latent heat
Latent heat is the energy required for a substance to change its state without changing temperature.
What is specific latent heat (SLH)?
The amount of energy needed to change 1 kg of a substance from one state to another without changing its temperature
SLH is different for different materials and state changes.
What is the specific latent heat of fusion?
The specific latent heat for changing between a solid and a liquid (melting or freezing)
It is the energy required for a substance to melt or freeze.
What is the specific latent heat of vaporization?
The specific latent heat for changing between a liquid and a gas (evaporating, boiling, or condensing)
It is the energy required for a substance to boil or condense.
True or False: Specific latent heat is the same for all materials.
False
Specific latent heat varies with different materials and states.
What is the formula for calculating the energy needed for a change of state?
E = mL
Where E is energy in joules, m is mass in kg, and L is specific latent heat in J/kg.
Fill in the blank: The formula for energy needed for a change of state is _______.
E = mL
What is the specific latent heat of vaporization for water?
2,260,000 J/kg
This value is used to calculate the energy needed to boil water.
How much energy is needed to completely boil 1.50 kg of water at 100 ℃?
3,390,000 J
Calculated using the formula E = mL: E = 1.50 kg x 2,260,000 J/kg.
During the processes of condensing or freezing, what happens to bonds between particles?
Bonds are forming
This process releases energy, decreasing internal energy.
What happens to temperature during condensing or freezing until the state change is complete?
It does not go down
Temperature remains constant until all the substance has turned into a liquid or solid.
What is the relationship between specific heat capacity and latent heat?
They are different concepts
Specific heat capacity relates to temperature change, while latent heat relates to state change.
