Heat and Phase Changes

Quiz
•
Chemistry
•
10th - 12th Grade
•
Hard
+1
Standards-aligned
Charles Martinez
FREE Resource
12 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It takes the addition of 335J of energy to boil a gram of water.
It takes the addition of 335J of energy to melt a gram of water.
It takes the removal of 335J of energy to boil a gram of water.
It takes the removal of 335J of energy to melt a gram of water.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 1 mol sample of solid Li is heated at constant pressure until the pressure starts to melt.
Which of the following is an accurate description of the sample after melting has started?
The temperature of the sample remains constant as the sample absorbs heat energy.
The energy of the sample remains constant as the temperature of the sample increases.
The temperature of the sample increases as the energy of the sample increases.
Both temperature and energy of the sample remain constant.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The enthalpy of vaporization of Ca is 153.6 kJ/mol under 1 atm of pressure.
Which of the following is an accurate description of 1 mol of liquid Ca if 153.6 kJ of energy is absorbed?
As energy is absorbed, the Ca atoms are ionized into gaseous ions.
The average size of the Ca atoms increases as the particles vaporize.
The temperature of the system increases as energy is absorbed by the system.
The energy of the system increases as the average distance between Ca atoms increases. The temperature remains constant.
Tags
NGSS.HS-PS3-4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In general, the molar heat of fusion for a substance is a smaller quality than the molar heat of vaporization for the same substance.
The BEST explanation for this observation is which of the following?
Vaporization involves a greater change in molecular potential energy than does fusion.
Vaporization involves a greater change in molecular kinetic energy than does fusion.
Vaporization takes place at a higher temperature than fusion.
The intermolecular forces (IMF) in liquids are greater than the IMF in solids.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A gas condenses to a liquid at its boiling point at constant pressure.
Which of the following BEST describes this process?
The process is exothermic; work is done on the system.
The process is endothermic; work is done on the system.
The process is exothermic; work is done by the system.
Work is done on the system, but the process takes place at a constant temperature, so it is neither exothermic nor endothermic.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The molar enthalpy needed to change liquid water to water vapor is 40.7 kJ/mol at 100oC. How much heat is gained/lost by the system when 6.00g of water vapor is condensed?
13.6 kJ
-13.6 kJ
-40.7 kJ
40.7 kJ
Tags
NGSS.HS-PS3-4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The internal energy of a substance will show the largest increase by which of the following?
Transferring energy from the surroundings of the system, while the system does work on the surroundings.
Transferring heat from the system to the surroundings, while the system does work on the surroundings.
Transferring energy from the surroundings to the system and doing work on the system.
Transferring heat from the system to the surroundings and doing work on the system.
Tags
NGSS.HS-PS3-4
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