Phase Change & Calorimetry

Which of the following is an example of a phase change?

• Melting ice

• Condensation of steam

• Freezing point

• Boiling water

What is the process called when a substance changes from a solid to a liquid?

• freezing

• evaporation

• solidifying

• melting

During a phase change, the temperature of a substance remains constant until all the substance has changed phase. True or False?

• Partially true

• False

• True

• Depends on the substance

What is the heat required to change the phase of 1 gram of a substance called?

• Latent heat of fusion or vaporization

• Boiling point

• Thermal conductivity

• Specific heat capacity

Which of the following is an example of an endothermic process?

• Melting of ice

• Condensation of steam

• Sublimation of dry ice

• Boiling of water

What is the SI unit of heat energy?

• Volt (V)

• Newton (N)

• Watt (W)

• Joule (J)

What is the specific heat capacity of water?

• 5.678 Joules/gram°C

• 4.184 Joules/gram°C

• 3.141 Joules/gram°C

• 2.718 Joules/gram°C

What is the formula to calculate heat energy?

• Q = m^2c^2

• Q = mv^2

• Q = mc^2

• Q = mcΔT

Which of the following is a unit of heat energy?

• Volt

• Newton

• Joule

• Watt

What is the heat capacity of a substance?

• Amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius.

• The color of the substance when exposed to heat.

• The weight of the substance at a specific temperature.

• Amount of heat required to lower the temperature of a unit mass of the substance by one degree Celsius.