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CEM 141 chapter 5 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141 chapter 5 Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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CEM 141 chapter 5
The average speed of H2S molecules is 1000m/s at 273K. Why would you not smell it
immediately if a container were open at the front of the auditorium? - ANS-molecules collide
with each other and therefore don't move in a straight line (Brownian motion)

Temperature is a measure of - ANS-average kinetic energy

KE is normally associated with: - ANS-translation

gas
translation:
rotation:
vibration: - ANS-"Free, free, free!"

liquid
translation:
rotation:
vibration: - ANS-restricted
less free than gas
free

solid
translation:
rotation:
vibration: - ANS-absent
very limited
free

temperature tells you - ANS-which direction thermal energy will transfer

which direction does thermal energy transfer? - ANS-from the hot object to the cold object

KE= - ANS-1/2mv^2=3/2kT

more ______ ---> more ______ -----> higher _______ - ANS-motion
KE
temperature

thermal energy - ANS-energy associated with the motion of particles (unit is J)

, Heat - ANS-strictly defined as the transfer of thermal energy from one place to another (eg by
collisions of molecules)

can we measure heat? - ANS-no, but we can tell which way it is transferred by measuring a
change in the temperature

specific heat - ANS-The energy required to heat one gram of a substance by one degree
Celsius (or K)

molar heat capacity - ANS-the energy required to raise the temperature of one mole of a
substance by one degree Celsius

Which substance will increase temperature the most if the same amount of heat is added to 10g
of each?
a. H2O(g) 2.01
b. H20 (l) 4.19
c. Aluminum 0.90
d. silver 0.24 - ANS-d

why does it take more energy to raise the temperature of liquid water than gaseous water? -
ANS-because of the IMF's present in liquid water

when steam is heated all of the energy goes toward - ANS-increasing the KEavg

When liquid water is heated energy goes toward - ANS-increasing KEavg and overcoming IMF's

how can we tell that the KEavg of a substance is increasing - ANS-by measuring the
temperature
-when temperature increases KEavg increases
-when temperature decreases KEavg decreases

what happens with energy during a phase change? - ANS-moving from s-l-g energy is absorbed
to break IMFs
moving from g-l-s energy is released to form IMFs

what happens to the temperature during a phase change? - ANS-the temperature stays the
same

what is the thermal energy doing in a phase change? - ANS-breaking IMFs

open system - ANS-can transfer energy and matter

closed system - ANS-can transfer energy but not matter

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