Heating and Cooling Curves Review

During which two processes does a substance release energy?

• D) evaporation and melting

• C) evaporation and condensation

• B) freezing and melting

• A) freezing and condensation

Tags

NGSS.MS-PS1-4

The cooling curve (left) represents the uniform cooling of a substance, starting at a temperature above its boiling point

During which time interval does the substance exist as both a liquid and a solid?

• A) min 2 to min 4

• B) min 4 to min 5

• C) min 5 to min 7

• D) min 7 to min 9

Tags

NGSS.HS-PS3-4

At standard pressure, during which physical change does the potential energy decrease?

• A) liquid to gas

• D) solid to liquid

• B) liquid to solid

• C) solid to gas

Tags

NGSS.MS-PS3-2

The average kinetic energy of water molecules decreases when

• H₂O(s) at 0C changes to H₂O(l) at 0C

• H₂O(s) at -73.2C changes to H₂O(s) at -36 C

• H₂O(l) at 64C changes to H₂O(l) at 27C

• H₂O(l) at 100C changes to H₂O(g) at 100C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A sample of water is boiling as heat is added at a constant rate. Which statement describes the potential energy and the average kinetic energy of the water molecules in this sample?

• The potential energy increases and the average kinetic energy increases.

• The potential energy increases and the average kinetic energy remains the same.

• The potential energy decreases and the average kinetic energy increases.

• The potential energy decreases and the average kinetic energy remains the same.

Tags

NGSS.HS-PS3-2

Which process is exothermic?

• boiling of water

• Condensation of ethanol vapor

• melting of copper

• Sublimation of iodine

Which phase change is accompanied by the release of heat?

• H₂O(s) → H₂O(l)

• H₂O(l) → H₂O(s)

• H₂O(s) → H₂O(g)

• H₂O(l) → H₂O(g)

Which change results in a release of energy?

• the evaporation of H₂O(l)

• the condensation of H₂O(g)

• the melting of H₂O(s)

• the boiling of H₂O(l)

State the direction of heat flow between the air in the oven and the muffin batter when the muffin batter is first placed in the preheated oven at 200.°C.

• from the air in the oven to the muffin batter

• heat flow depends on the specific heat capacity of the muffin batter

• from the muffin batter to the air in the oven

• no heat flow between the air in the oven and the muffin batter

Tags

NGSS.HS-PS3-4

What happens to the average kinetic energy of the molecules in the sample during the first 3 minutes?

• It remains the same

• It increases

• It cannot be determined

• It decreases

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-2

NGSS.HS-PS3-4