Chemical Process Analysis Concept Inventory – Project 1
Answer
Key
DO NOT WRITE ON THIS PAPER COPY!
The purpose of this multiple-choice inventory is to help you assess your understanding of basic concepts in chemical
process analysis. Please do the following:
1.
You are to complete the “Project P1 Concept Inventory, Part A” survey in Team 360 by yourself,
using the questions below. Write your selected options (like A or C) for each question on some scrap paper.
2.
After all members in your team have completed this survey, your team is to meet, compare answers,
resolve any differences, and be ready to state “why” for each answer.
3.
Member Heart is to complete the “Project P1 Concept Inventory, Part B” survey in Team 360 using
the consensus answers of your team.
4.
Your team is to consult with the instructor and address the “why’s” for your team’s answers.
∟ What principle did you use to figure out the answer?
Please return this paper copy of the concept inventory to the instructor before you leave class today.
1. If the process unit show below operates at steady state and no chemical reactions are occurring within
its system boundary, which one of the following statements is true about the molar flow rates?
C
mol/s
A
mol/s
process unit
D
mol/s
B
mol/s
E
mol/s
system boundary
A.
B.
C.
D.
E.
Stream A is equal to Stream C.
Streams A plus B are equal to Stream C.
Streams A plus B are equal to Streams C plus D.
Streams A plus B are equal to Streams C plus D plus E.
None of the above.
material balance
2. If the system in Question 1 was just being started up, which one of the following statements is true
about the molar flow rates?
A.
B.
C.
D.
E.
Stream A is equal to Stream C.
Streams A plus B are equal to Stream C.
Streams A plus B are equal to Streams C plus D.
Streams A plus B are equal to Streams C plus D plus E.
None of the above.
unsteady state, can not judge
3. On a hot summer day Professor Vigeant places a glass of water outside in the sun. The time frame
under consideration is while the water is evaporating into the air. If the system boundary is drawn
around the glass, what would Professor Vigeant classify this system as?
A.
B.
C.
D.
E.
a batch process.
a semi-batch process.
a continuous process.
a semi-continuous process.
I’m thirsty for a hot cup of tea.
water is evaporating
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Chemical Process Analysis Concept Inventory – Project 1
DO NOT WRITE ON THIS PAPER COPY!
Answer
Key
4. Professor Jablonski is thirsty and wants a drink, so she pours soda from a can into a glass. For this
problem, the system boundary is the glass. The time frame under consideration is while she is
pouring the soda into the glass. What would Professor Jablonski classify this system as?
A.
B.
C.
D.
E.
a batch process.
a semi-batch process.
a continuous process with respect to the soda.
a semi-continuous process with respect to the soda.
I’m not a big soda drinker, so pass me some iced tea!
flow in, but no flow out
5. Professor Hanyak is about to burn a piece of paper inside a bell jar that is isolated from its
surroundings. Paper and air only exist in State 1. The paper is ignited and allowed to burn as shown
in State 2. Ashes are left as shown in State 3. If the bell jar has been weighed at each state, which
one of the following conclusions can Professor Hanyak draw?
(1) paper
A.
B.
C.
D.
E.
(2) fire
State 1 has the largest weight.
State 2 has the largest weight.
State 3 has the largest weight.
All three have the same weight.
We are in need of a fire extinguisher!
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(3) ashes
conservation of mass
Chemical Process Analysis Concept Inventory – Project 1
DO NOT WRITE ON THIS PAPER COPY!
Answer
Key
6. Professor Snyder puts peas and carrots into a pot with water. He boils the water and allows the
vegetables to cook. After a proper amount of time, the pot of peas and carrots is taken off the stove
because the vegetables are done. Before Professor Snyder can eat them, he must pour them through a
strainer. The time frame under consideration is while Professor Snyder is doing the pouring. If the
system boundary is drawn around the strainer, the pouring step would be classified as?
A.
B.
C.
D.
E.
a continuous process with respect to the water flowing through the strainer.
a semi-batch process with respect to the vegetables being collected in the strainer.
a semi-continuous process considering both the vegetables and water.
all of the above.
water in and vegetables in; only water out
just food for a hungry family.
7. Professor Csernica is playing his saxophone in the pep band at Sojka Pavilion. He is also watching
Chris McNaughton attempting a 3-point basketball shot. The time frame under consideration is when
the basketball leaves Chris’ hand and falls completing through the hoop. If the system boundary is
drawn around the basketball hoop, the flight of the basketball would be classified as?
A.
B.
C.
D.
E.
a continuous process.
a batch process.
a semi-continuous process.
a semi-batch process.
three points for Bucknell Basketball!
flow in and flow out
8. Consider a warm summer day, and Professor King and some of his friends want to go for a swim.
Professor King and his friends jump into Bucknell’s swimming pool and are bobbing around to keep
cool. No water is entering into and evaporating from the pool. The time frame under consideration is
while Professor King and his friends are in the pool. If the system boundary is drawn around the pool,
would you classify the system as?
A.
B.
C.
D.
E.
a batch process.
a continuous process.
a semi-batch process.
a semi-continuous process.
some people having a good time.
no water in and out; no people in and out
9. On a lovely spring day, Professor Prince decides to water the flowers outside of his home. Professor
Prince turns the faucet on, and uses a hose to water the trees, bushes, and plants around his house.
The time frame under consideration is while the water is running through the hose. If the system
boundary is drawn around the hose, what would Professor Prince classify the system as?
A.
B.
C.
D.
E.
a batch process.
a continuous process.
a semi-continuous process.
a semi-batch process.
The process of having fun with yard work.
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water in and out of hose
Chemical Process Analysis Concept Inventory – Project 1
Answer
Key
DO NOT WRITE ON THIS PAPER COPY!
10. Mark, Sabrina, and Melissa are environmental engineers at Doo Doo sewage treatment plant in
Lewisburg, PA. The sewage in composed of water and biodegradable materials (paper products and
solid particles, use your imagination…). The paper products remain suspended in the solution;
however, the heavier particles tend to sink to the top of the gravel layer. The water allows the sewage
to flow through the filter system. In the filter system below, bacteria break down the biodegradable
materials. An exit pipe takes the cleaned water away to be further treated.
Sewage
Stream
Heavy Mesh
Screen
Bacteria
Gravel
Further
Treatment
Fluid Level
Water
What would you characterize this system as if you consider the red box the system?
A.
B.
C.
D.
E.
a steady-state operation with respect to the water.
an unsteady-state operation with respect to the biodegradable material.
an unsteady-state operation with respect to the gravel.
options A and B.
water in and out. bio-material in but not out.
options A, B, and C.
for gravel, no flow in and out, no reaction.
thus, gravel is at steady state.
Please return this paper copy of the concept inventory to the
instructor before you leave class today.
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