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WorksheetsThermodynamics
Total questions: 50
Worksheet time: 43mins
When you place the metal in boiling water, heat flows from the _________ to the _______.
metal to the boiling water
bottom of the metal to the top half of the metal
bottom of the water to the top of the water
boiling water to the metal
Define ΔH
Change in Specific Heat; Heat by one Degree Celsius
Change in Temperature; the energy we calculate; Degree Celsius
Change in Enthalpy; the energy/heat we calculate
Change in Time; time travel
Define Exothermic
Energy is released; ΔH is negative; Going from Gas to Liquid, Liquid to Solid
Energy is absorbed; ΔH is positive; Going from Gas to Liquid, Liquid to Solid
Energy is released; ΔH is positive; Going from Solid to Liquid, Liquid to Gas
Energy is absorbed; ΔH is negative; Going from Gas to Liquid, Liquid to Solid
Specific Heat is..
the temperature initial minus temperature final
the amount of heat/energy required to raise 1 gram of a substance by 1°C (or K) aka "C"
the temperature final minus temperature initial
the item in a system with given weight in grams
Is this phase change representing an exothermic or endothermic reaction?
GAS to LIQUID
Exothermic
Endothermic
Is the phase change representing an exothermic or endothermic reaction?
SOLID to LIQUID
Endothermic
Exothermic
Is the reaction exothermic or endothermic?
H2 + S + O2 -> H2SO4 ΔH = -811.13kJ
ΔH is negative so it is exothermic
ΔH is positive so it is exothermic
ΔH is positive so it is endothermic
ΔH is negative so it is endothermic
A reaction has both positive ∆S° and ∆H° values. From this information alone, you can conclude that the reaction
can be spontaneous at any temperature.
cannot be spontaneous at high temperatures.
can be spontaneous only at low temperatures.
can be spontaneous only at high temperatures.
Which of the following is true when ice melts?
∆H<0 ∆S<0
∆H=0 ∆S=0
∆H<0 ∆S>0
∆H>0 ∆S>0
Which of the following is true for the condensation of benzene, C6H6?
∆H°>0, ∆S°>0
∆H°>0, ∆S°<0
∆H°<0, ∆S°>0
∆H°<0, ∆S°<0
At a certain temperature C(s) + O2 (g) ⟶ CO2 (g) has a ∆G of -339.4 kJ. This means that at this temperature
the system is at equilibrium.
gaseous carbon dioxide is unstable.
gaseous carbon dioxide spontaneously forms.
this system has a high reaction rate.
Rudolf Clausius stated the basic ideas of _____law of thermodynamics.
first
second
zeroth
Isolated system can exchange------- with its surroundings.
only energy
both matter and energy
neither matter nor energy
------ is an extensive property.
specific heat capacity
heat capacity
molar volume
density
For an adiabatic process
q=0
dT=0
dP=0
dV=0
For an isothermal process----
q=0
dT=0
dP=0
Work and heat are ------function.
state
path
If heat flows into the system from the surrounding, heat is taken as ------
-q
+q
If work is done by the system, the energy of the system decreases, work is taken as--------
-w
+w
In an exothermic reaction,heat is evolved by the system to the surroundings.
q>0,
Δ H=+veq<0, Δ H=-ve
Which direction does energy flow?
From hotter to cooler
From cooler to hotter
Energy does not flow
Which is true about an egg cooking in a pot of water on the stove? Check all that are correct
The egg is the system
The egg is the surrounding
The pot of water is the system
The pot of water is the surrounding
You have two blocks of ice. One is much larger than the other. What is true about the two blocks of ice? Choose all that are correct.
They have the same temperature
They have different temperatures
They have the same amount of heat
They have different amounts of heat
Thermodynamics is not concerned about
Energy changes involved in a chemical reaction.
The extent to which a chemical reaction proceeds
The rate at which a reaction proceeds.
The feasibility of a chemical reaction.
Which of the following variables controls the physical properties of a perfect gas
pressure
temperature
volume
all of the above
Intensive property of a system is one whose value
depends on the mass of the system, like volume
does not depend on the mass of the system, like temperature, pressure, etc.
is not dependent on the path followed but on the state
is dependent on the path followed and not on the state
An isolated system is one in which
mass does not cross boundaries of the system, though energy may do so
neither mass nor energy crosses the boundaries of the system
both energy and mass cross the boundaries of the system
mass crosses the boundary but not the energy
In a free expansion process
(a) work done is zero
(b) heat transfer is zero
(c) both (a) and (b) above
(d) work done is zero but heat increases
First law of thermodynamics furnishes the relationship between
heat and work
heat, work and properties of the system
heat and internal energy.
various properties of the system
In which of the following systems, neither matter nor heat is exchanged between system and surrounding?
Open system
Closed system
Isolated system
What is the unit of entropy?
K mol-1
K J-1
J mol-1
J K-1 mol-1
Which one of these factors will NOT increase entropy?
Change of state from liquid to solid
Increase in the number of molecules
Mixing in particles
Adding solvent to a solvent
What is the formula for the Gibbs Free Energy change?
ΔG= ΔH – TS
ΔG=ΔH – ΔTS
ΔG=TΔS – ΔH
ΔG= ΔH – TΔS
Enthalpy H =
U-PV
U+PV
PV
PV-U
What is the definition of thermodynamics?
The energy available to do work.
The study of the relationship between heat, work, and energy.
The amount of heat it takes to move an engine.
The movement of heat.
What is latent heat?
Heat that doesn’t move from high temperature to low temperature, also known as “lazy heat.”
The heat required to move an object from its “latent” position.
The heat required to convert the state of matter of a substance without changing its temperature.
Heat that does not move unless acted upon by an outside source.
Which statement is true about the First Law of Thermodynamics?
It states that energy cannot be created.
It states that energy cannot be destroyed.
It is another name for the Law of Conservation of Energy.
All choices are correct.
2nd law of thermodynamics
Every time energy changes form, some of it is lost to the environment
Energy can't be created or destroyed
All energy generates heat
Heat transferred by direct contact is:
Conduction
Convention
Radiation
illegal because quarantine
Heat will never flow from a cold object to a hot object on its own describes which law of thermodynamics?
1st Law of thermodynamics
2nd Law of thermodynamics
3rd Law of thermodynamics
4th Law of thermodynamics
Which is an example of decreasing entropy in a closed system?
Boiling water
Freezing water
Cells in a body coming together
Ice melting
A system comprising a single phase is called a
(a) closed system
(b) open system
(c) isolated system
(d) homogeneous system
(e) heterogeneous system.
The value of one bar (in SI units) is equal to
(a) 100 N/m2
(b) 1000 N/m2
(c) 1 × 104 N/m2
(d) 1 × 105 N/m2
(e) 1 × 106 N/m2.
Which of the following is an intensive property of a thermodynamic system ?
(a) Volume
(b) Temperature
(c) Mass
(d) Energy.
A system is in thermodynamic equilibrium
if temperature and pressure at all points are same
if temperature and pressure at all points are not same
if temperature at all points are same
if pressure at all points are same
Which of the following are ways in which energy can be transferred to or from a substance?
a. heat and internal energy
b. work and internal energy
c. heat and work
d. heat and kinetic energy
For an adiabatic process, which of the following statements is correct?
a. Work, heat, and internal energy all undergo changes.
b. Work and heat balance each other, so that there is no change in internal energy.
c. No energy is transferred as heat; internal energy change is due to work.
d. No work is done; internal energy change is due to heat.
