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WorksheetsPhase Changes and Clauisus Clapeyron
Total questions: 54
Worksheet time: 48mins
The melting point is raised by increase of
Pressure
Volume
Temperature
Energy
Liquid converts into vapour state, there is an increase in
Pressure
Volume
Energy
Temperature
At what point(s) is a phase change occurring?
A
D
B and D
A and C
How much heat is required to convert 135 g of water to steam at a 100 °C? (Molar heat of fusion= 6.02 kJ/mol, molar heat of vaporization= 40.7 kJ/mole)
45.075 kJ
305.25 kJ
5494.5 kJ
811.35 kJ
What relationship with Intermolecular Forces can be seen when looking at Diatomic Fluorine ( F2 )?
Hydrogen Bonding, Dipole-Dipole, & Dispersion
Hydrogen Bonding & Dispersion
Dipole-Dipole & Dispersion
Non-Polar, So Only Dispersion
Solve for the value of P2:
ln(P2/40.1 mmHg) = 2.1084
330.2 mm Hg
340.3 mm Hg
280.2 mm Hg
373.2 mm Hg
Which of the following elements is unable to form hydrogen bonds?
Carbon
Nitrogen
Oxygen
Fluorine
Which forces are greater when water forms a spherical water droplet on a table?
adhesive forces
cohesive forces
Which molecule should have a higher boiling point?
Ethanol
Propane
Metallic crystals are composed of anions and cations.
True
False
What does the term 'volatile' imply about a liquid?
It has a high vapor pressure
It has a low boiling point
It evaporates quickly
All of the above
What is the significance of the Clausius-Clapeyron equation in understanding phase changes?
It describes the relationship between vapor pressure and temperature
It measures the electrical conductivity during a phase change
It predicts the change in color during a phase change
It helps calculate the change in volume during a phase change
What is the effect of a sealed container on the vapor pressure of a volatile liquid?
Has no effect on the vapor pressure
Turns the liquid into a solid
Increases the risk of explosion due to pressure build-up
Decreases the vapor pressure
Region "c" in the heating curve corresponds to
a pure gas increasing in temperature
a liquid increasing in temperature
a solid increasing in temperature
a solid melting
Which one of the following will have the strongest viscosity?
water
apple juice
syrup
peanut butter
16-24.
Answer the questions below after watching the video
What property of liquids is unique and related to its ability to form a gas?
Density
Vapor pressure
Surface tension
Viscosity
What does vapor pressure depend on?
Amount of liquid
Type of liquid
Container size
Temperature of the liquid
What happens to water molecules when they are in a closed container?
They condense on the container's walls
They freeze
They only evaporate
They form a dynamic equilibrium
What is established when the rate of evaporation equals the rate of condensation?
Surface tension
Vapor pressure
Melting point
Boiling point
What is the result of water vapor going back into the water phase in a closed container?
Equilibrium state
Increase in viscosity
Increase in pressure
Decrease in temperature
What is necessary to establish vapor pressure in a container?
Closing the container
Heating the container
Removing all the air
Adding more liquid
What demonstrates the concept of vapor pressure in the video?
Freezing water
Water under gravity
Evaporating and condensing water in a closed container
Boiling water
What term describes the state where no net change is observed despite ongoing processes?
Dynamic equilibrium
Chemical equilibrium
Static equilibrium
Physical equilibrium
What can be said about the molecules at dynamic equilibrium?
They stop moving
They evaporate and condense at equal rates
They only evaporate
They only condense
What is the state of matter at Y?
Solid
Liquid
Gas
Supercritical fluid
What is the state of matter at X?
Solid
Liquid
Gas
Supercritical fluid
Water exists as a _____________ at 3 mmHg and 50 °C.
Solid
Liquid
Gas
Supercritical fluid
At 10 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?
Freezing, then condensation
Melting only
Sublimation only
Melting, then boiling
The pressure is increased on a sample of water at 0 °C from 1 mmHg to 800 mmHg. In order, what changes occur?
Deposition then melting
Sublimation then melting
Condensation then freezing
Deposition then freezing
Describe phase changes that occurs at letter B?
Liquid to solid
Liquid, solid-liquid equilibrium to solid
Solid to liquid
Vapour to liquid
What line segment represents only the solid state? (Diagram F)
A-B
B-C
C-D
D-E
A substance's heating curve is shown in the graph. What is its boiling point? (Diagram B)
100 C
60 C
80 C
20 C
What is the vapor pressure of propanone at 50oC?
37 kPa
50 kPa
83 kPa
101 kPa
Which compound has the lowest vapor pressure at 50oC?
propanone
ethanoic acid
water
ethanol
Which substance has the weakest intermolecular forces?
Substance A, boiling point of 75 °C
Substance B, boiling point of 105 °C
Substance C, boiling point of 25 °C
Substance d, boiling point of 45 °C
The weaker the intermolecular forces of a substance the _____________ the boiling point
higher
lower
According to the reference table, what is the boiling point of ethanoic acid at 80 kPa?
28 oC
100oC
111oC
125oC
Which liquid has the highest vapor pressure at 75oC?
ethanoic acid
ethanol
propanone
water
At which temperature is the vapor pressure of ethanol equal to the vapor pressure of propanone at 35oC?
35oC
60oC
82oC
95oC
What is the normal boiling point of water
0oC
100oF
50oC
100oC
Why does a gas with a lower vapor pressure have a higher boiling point?
the molecules need more energy to break free of their attractions to other molecules and change phase from liquid to gas
the forces of attraction between the molecules are strong
the substance has low volatility
all of the answers are correct
Which model represents a LOWER Vapor Pressure?
A
B
Which model represents STRONGER Intermolecular Forces?
A
B
Imagine A & B represent the same substance. Which model would be at a HIGHER temperature?
A
B
The process of going from liquid to gas
evaporation
vaporization
condensation
sublimation
The process of going from gas to liquid
vaporization
condensation
evaporation
sublimation
If a substance has weak intermolecular forces, it will have a relatively ______ vapor pressure
high
low
average
What does point A represent??
the triple point
the critical point
the equilibrium point
the normal melting point
What happens to vapor pressure when you add a solute to a solution?
It lowers the vapor pressure.
It has no effect.
It raises the vapor pressure.
It causes the reaction to reach equilibrium.
