Cooling Curves

On a heating or cooling curve, the substance is a single state of matter (solid, liquid, or gas) when the line is

• sloped (going up or down at an angle)

• horizontal (flat)

Tags

NGSS.MS-PS1-4

On a heating or cooling curve, the substance is going through a phase change when the line is

• sloped (going up or down at an angle)

• horizontal (flat)

Tags

NGSS.MS-PS1-4

The following image shows the temperature change of a substance as thermal energy is released over time. Select all regions where the phase is changing

• AB

• BC

• CD

• DE

• E to the end

Tags

NGSS.MS-PS1-4

• 150

• 100

• freezing

• condensation

• boiling

Tags

NGSS.MS-PS1-4

If Region AB is a gas, identify BC and C to the end.

a

b

condensation

solid

boiling

freezing

liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

On a cooling curve, what does a horizontal line typically represent?

• A) A phase change

• B) A constant temperature

• C) A change in state

• D) A decrease in energy

Tags

NGSS.MS-PS1-4

Which of the following best describes the process occurring during the sloped sections of a cooling curve?

• A) The substance is undergoing a phase change

• B) The temperature of the substance is constant

• C) The substance is losing energy and cooling down

• D) The substance is gaining energy and heating up

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

During the flat portion of a cooling curve, what is happening to the energy of the substance?

• A) Energy is being absorbed

• B) Energy is being released

• C) Energy remains constant

• D) Energy is increasing

Tags

NGSS.MS-PS1-4

What is the significance of the plateau observed in a cooling curve?

• A) It indicates a change in temperature

• B) It signifies a phase change

• C) It shows an increase in kinetic energy

• D) It represents a chemical reaction

Tags

NGSS.MS-PS1-4

In a cooling curve, what does the slope of the line indicate?

• A) The rate of temperature change

• B) The type of phase change

• C) The amount of energy absorbed

• D) The specific heat capacity

Tags

NGSS.MS-PS3-4