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WorksheetsPhases and Entropy
Total questions: 25
Worksheet time: 13mins
Which sample of matter has the greatest distance between molecules at STP?
N2(g)
NH3(aq)
C4H16(l)
NaCl(s)
Which substance will occupy the container completely and uniformly?
Hg(l)
O2(g)
NaCl(aq)
C6H12O6(s)
Which sample of CO2 has a definite shape and a definite volume?
CO2(aq)
CO2(l)
CO2(g)
CO2(s)
The particles in a crystalline solid are arranged
regularly and close together
regularly and far apart
randomly and close together
randomly and far apart
At which temperature would the molecules in a sample of water have the lowest average kinetic energy?
5 °C
-100 °C
5 K
100 K
An metal bar at 325 K is placed in a sample of water. The metal bar gains energy from the water if the temperature of the water is
65 K
338 K
45 K
318 K
The temperature of a sample of matter is a measure of the
average kinetic energy of its particles
average potential energy of its particles
total kinetic energy of its particles
total potential energy of its particles
The provided diagram shows a system of gases with the valve closed. As the valve is opened, the entropy of the gaseous system
decrease
increase
remain the same
During which phase change does one mole of carbon dioxide increase in entropy?
CO2(g) → CO2(l)
CO2(l) → CO2(g)
CO2(g) → CO2(s)
CO2(l) → CO2(s)
Which phase change is exothermic?
H2O(s) → H2O(l)
H2O(l) → H2O(s)
H2O(s) → H2O(g)
H2O(l) → H2O(g)
Given the balanced equation:
I2(s) + energy → I2(g)
As a sample of I2(s) sublimes to I2(g), the entropy of the sample
increases because the particles are less randomly arranged
increases because the particles are more randomly arranged
decreases because the particles are less randomly arranged
decreases because the particles are more randomly arranged
Given the diagram representing a heating curve for a substance, during which time interval is the average kinetic energy of the particles of the substance constant while the potential energy of the particles increases?
AC
BC
CD
DF
The graph below represents the uniform heating of a sample of a substance starting as a solid below its melting point.
Which statement describes what happens to the energy of the particles of the sample during time interval DE?
Average kinetic energy increases, and potential energy remains the same.
Average kinetic energy decreases, and potential energy remains the same.
Average kinetic energy remains the same, and potential energy increases.
Average kinetic energy remains the same, and potential energy decreases
Which physical changes are endothermic?
melting and freezing
melting and evaporating
condensation and sublimation
condensation and deposition
The graph below represents the uniform cooling of a substance, starting with the substance as a gas above its boiling point. During which interval is the substance completely in the liquid phase?
AB
BC
CD
DE
What occurs when a substance melts?
It changes from solid to liquid, and heat is absorbed.
It changes from solid to liquid, and heat is released.
It changes from liquid to solid, and heat is absorbed.
It changes from liquid to solid, and heat is released.
Base your answer to the following question on the graph below, which represents uniform cooling of a sample of a pure substance, starting as a gas.
The boiling point of the substance is
10 °C
60 °C
120 °C
180 °C
As heat is added to a liquid that is boiling at constant pressure, the temperature of the liquid will
decrease
increase
remain the same
As carbon dioxide sublimes, its entropy
decreases
increases
remain the same
Which graph best shows the relationship between Kelvin temperature and average kinetic energy?
Which species readily sublimes at room temperature?
CO2(s)
CO2(l)
CO2(g)
CO2(aq)
Which is the most common property of liquids?
definite shape
definite volume
high compressibility
high vapor pressure
Which grouping of the three phases of bromine is listed in order from left to right for increasing distance between bromine molecules?
gas, liquid, solid
solid, gas, liquid
liquid, solid, gas
solid, liquid, gas
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase of
moles
temperature
pressure
volume
Which temperature is equal to 20 K?
-253 °C
-293 °C
253 °C
293 °C
