KMT and Phase Changes

Based on the heating curve, what happens to the particles within a substance as it changes from a liquid to a gas?

• When changing to a gas, the particles within a substance break free of each other, move randomly and freely, with no defined volume.

• As the temperature decreases, the particle vibrations within a substance increases, causing them to move faster and more freely.

• When changing to a gas, the particles within a substance slide past each other, move randomly and freely, with a defined volume

• Intermolecular forces hold the particles within the substance close together during the phase change. 

Tags

NGSS.MS-PS1-4

At POINT C, the substance is completely _____________, or in a ____________ state.

Tags

NGSS.MS-PS1-4

As heated is added to the substance does the temperature always increase?

• Yes it always increases

• No it does not increase during the phase change

• It never increases

• It always stays the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Phase change going from Liquid to Solid...

• Melting

• Freezing

• Condensation

• Sublimation

Tags

NGSS.MS-PS1-4

Phase change going from a Solid to a Liquid...

• Freezing

• Condensation

• Melting

• Sublimation

Tags

NGSS.MS-PS1-4

All changes in the state of matter of a substance requires

• vibration

• water

• permission

• energy

Tags

NGSS.MS-PS1-4

A gas

• has a definite shape but no definite volume

• has a definite volume but no definite shape

• has fast-moving particles

Tags

NGSS.MS-PS1-4

According to the heating curve, when a substance is melting, what is happening to the temperature as energy is continually being added it?

• The temperature is increasing as more energy is being added to melt the substance.

• The temperature stays the same as energy continues to be added to melt the substance.

• The temperature is decreasing as more energy is being added to melt the substance.

• The flat curve indicates a change in the temperature allowing for a change in phase.

Tags

NGSS.MS-PS1-4

At Point A, the beginning of observations, the substance exists in a solid state. Material in this phase has a ____________ volume and ___________ shape.

Tags

NGSS.MS-PS1-4

At POINT B, the temperature is _______ degrees C.

Tags

NGSS.MS-PS1-4