Test Review: Phases, Phase Changes, and Concentration
Part 1: Concepts
Use a combination of words and diagrams to explain how solids, liquids, and gases are different from each other and how the movement of their
particles changes with energy changes.
A proficient response should include how the particles move in each phase of matter, information about kinetic and potential energy changes, and
name the phase changes.
An expanding response could include some of the following: how intermolecular forces and molar mass help determine what phase a substance will
be at room temperature (with specific examples), other phases of matter outside the typical three (as well as their properties),
At least some correct and relevant
information about the concept is
included in the response.
The explanation is generally
correct but misses at least one
main point or does not connect the
The response explains the concept
fully as it was presented in class.
In addition to explaining the
concept, the response relates this
information to other units, courses,
or real-life examples.
Part 2: Calculations of Energy Changes in Temperature & Phase Changes
How much energy is required to raise 5.0g of water from 20.0°C to 50.0°C?
How much energy is required to change 2.0g of ice to liquid water if the ice is at 0°C?
If a metal that has a mass of 5.00g absorbs 6.72J to change temperature from 21.0°C to 24.0°C, what is the specific heat of the metal?
If a 15.0g sample at its melting point absorbs 1635J to change from solid to liquid, what is the heat of fusion of the substance?
How much energy would be required to completely boil off 35.0g of water from a pot that starts at 20.5°C?
How much energy does a sample of 25.5g of H2O lose as it is placed into a freezer and goes from 19.5°C to -10.0°C?
A 5.00g block of solid ethanol is moved from a freezer that has a temperature of -120.0°C into 100.0g of water at 25.6°C. The final temperature of
the water is 20.0°C. What is the heat of fusion of ethanol?
Part 3: Concentration
What information does the
concentration of a solution
If a solution has a volume of 4.2L
and has 1.50mol, what is the
If 15.7g of AgNO3 are dissolved
into 250mL of water, what is the
How would someone prepare
500.mL of 0.25M NaOH given
solid NaOH and water?
If a solution is made by dissolving
25.0g of KNO3 into 250g of water,
what is the percent solution?
If 25.0mL of 15.8M HNO3 are
How would someone prepare
added to 175.0mL of water, what is 1.50L of 0.25M H2SO4 given 18M
the final volume and
H2SO4 and water?
Heat of Fusion = 334J/g
Heat of Vaporization = 2260J/g
Specific Heat(solid) = 2.108J/g°C
Specific Heat(liquid) = 4.186J/g°C
Specific Heat(solid) = 2.419J/g°C
Specific Heat(liquid) = 2.57J/g°C
Melting Point = -114.1°C
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