Phase Change 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

The heat absorbed by melting a solid is known as

• latent heat of fusion

• latent heat of solid

• latent heat of liquid

• latent heat of vaporisation

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

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

Study the diagram below. The material begins to condense at point:

• 1

• 2

• 3

Tags

NGSS.MS-PS1-4

The amount of heat required to change the phase of a substance depends on two factors which are

• surrounding temperature

• temperature change

• material

• the mass

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

specific latent heat of vaporisation is

• the amount of heat required to change 1 kg of the substance from the solid to liquid phase without change in temperature

• the amount of heat required to change 1 kg of the substance from the liquid to gaseous phase without change in temperature

• the amount of heat required to change the temperature 1 kg of the substance by 1 degree Celcius

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you transfer energy into two substances, which will EVAPORATE faster?

• The one with WEAK attraction.

• The one with STRONG attraction.

• Neither will evaporate.

• Both will evaporate.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The same amount of energy was transferred into two liquids substances. Later, one changed phase while the other had not. Which changed phase, and how did it change?

• The one with STRONGER attraction it is now a SOLID.

• The one with WEAKER attraction it is now a LIQUID.

• The one with WEAKER attraction it is now a GAS.

• The one with STRONGER attraction it is now a gas.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If energy is taken out of the substance, and the substance changed into a liquid,

• the substance started as a solid

• the substance started as a liquid

• the substance stayed the same

• the substance started as a gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4