Latent Heat Calculations

This formula is used to find the amount of heat (energy) neccesary when there's a phase change

• Q= (h)(ΔT)

• Q=(m)(L)

• Q=(m)(c)(ΔT)

• Q=(k)(A)(dT)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

It's the amount of heat required to change the state (gas,liquid, solid) of a unit of material

• Latent Heat

• Specific Heat

• Temperature

• Q

Tags

NGSS.MS-PS1-4

This symbol represents latent heat

• Q

• c

• ΔT

• L

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Latent heat is

• the heat absorbed or released at a boiling process during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase

• the heat absorbed or released at a constant temperature during a change of phase of 1 kg object

• the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A laboratory experiment requires the calculation of the energy needed to melt 150 g of a substance with a latent heat of fusion of 80 J/g. What is the total energy required for the melting process?

• 12000 J

• 1200 J

• 12 J

• 120 J

Tags

DOK Level 2: Skill/Concept

A scientist needs to calculate the latent heat of fusion of ice. She has 500 grams of ice and knows that the latent heat of fusion for ice is approximately 334 J/g. Calculate the total amount of heat required to melt the ice completely.

• 167000 J

• 33400 J

• 167 J

• 334000 J

Tags

DOK Level 2: Skill/Concept

Design an experiment to determine the latent heat of vaporization of water using materials commonly found in a high school laboratory. Outline the steps and explain the calculations needed.

• Freeze water, measure the temperature change, calculate the energy absorbed.

• Measure the volume of water, heat at room temperature, observe the change in state.

• None of the above.

Tags

DOK Level 4: Extended Thinking

In a hypothetical scenario, a new material has a latent heat of vaporization that is five times its latent heat of fusion. If the latent heat of fusion is 120 J/g, what is the latent heat of vaporization?

• 600 J/g

• 24 J/g

• 240 J/g

• 60 J/g

Tags

DOK Level 2: Skill/Concept

If a material has a latent heat of vaporization of 2260 kJ/kg, how much energy is required to vaporize 250 g of this material?

• 565 kJ

• 565000 J

• 2260 J

• 226000 J

Tags

DOK Level 2: Skill/Concept

What is the latent heat of vaporisation for water?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4