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Updated on: 19 Oct 2025, 10:44
Originally posted by Sajjad1994 on 15 Dec 2019, 09:39.
Last edited by Bunuel on 19 Oct 2025, 10:44, edited 3 times in total.
Last edited by Bunuel on 19 Oct 2025, 10:44, edited 3 times in total.
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Either shift: Phenol: (health = 3, flammability = 2, reactivity = 0, oxidizer = no, monomer = no)
Neither shift: Nickel carbonyl: (health = 4, flammability = 3, reactivity = 3, oxidizer = no, monomer = no)
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
75% (04:06) correct
25%
(03:50)
wrong
based on 456
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A chemical plant operating continuously has two 12-hour shifts, a day shift and a night shift, during each of which as many as five chemicals can be produced. Equipment limitations and safety regulations impose constraints on the types of chemicals that can be produced during the same shift. No more than two oxidizers can be produced per shift; the same limit holds true for monomers. On either shift, the sum of fire protection standards for all chemicals should be no greater than 13 for health risk, 12 for flammability, and 9 for reactivity. On each of these three dimensions, the standard for any chemical is an integer that ranges from 0 (lowest) to 4 (highest).
Four chemicals have already been chosen for each shift, as shown below:
Select a chemical that could be added to either shift. Then select a chemical that could be added to neither shift. Make only two selections, one in each column.
23.jpg [ 113.3 KiB | Viewed 8316 times ]
Four chemicals have already been chosen for each shift, as shown below:
Select a chemical that could be added to either shift. Then select a chemical that could be added to neither shift. Make only two selections, one in each column.
Attachment:
23.jpg [ 113.3 KiB | Viewed 8316 times ]
| Either shift | Neither shift | |
| Chlorine: (health = 3, flammability = 0, reactivity = 0, oxidizer = yes, monomer = no) | ||
| Ethylene: (health = 3, flammability = 4, reactivity = 2, oxidizer = no, monomer = yes) | ||
| Nickel carbonyl: (health = 4, flammability = 3, reactivity = 3, oxidizer = no, monomer = no) | ||
| Phenol: (health = 3, flammability = 2, reactivity = 0, oxidizer = no, monomer = no) | ||
| Sulfuric acid: (health = 3, flammability = 0, reactivity = 2, oxidizer = yes, monomer = no) | ||
| Vinyl chloride: (health = 2, flammability = 4, reactivity = 2, oxidizer = no, monomer = yes) |
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Official Answer
Either shift: Phenol: (health = 3, flammability = 2, reactivity = 0, oxidizer = no, monomer = no)
Neither shift: Nickel carbonyl: (health = 4, flammability = 3, reactivity = 3, oxidizer = no, monomer = no)
15 Dec 2019, 11:19
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Neither one is : Nickel Carbonyl,since in day shift it would increase the health to 14 (Max 13 is allowed) and in night shift it will increase the reactivity to 10( Max allowed is 9)
Either one : Phenol and Chlorine suit day shift and Phenol, Ethylene and Vinyl Chloride will work for night shift ( after we calculate and check all the parameters per the argument) so the common one is Phenol
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Either one : Phenol and Chlorine suit day shift and Phenol, Ethylene and Vinyl Chloride will work for night shift ( after we calculate and check all the parameters per the argument) so the common one is Phenol
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23 Mar 2020, 22:00
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SajjadAhmad
rules:
On each of these three dimensions, the standard for any chemical is an integer that ranges from 0 (lowest) to 4 (highest).
(1) No more than two oxidizers can be produced per shift; the same limit holds true for monomers.
(2) On either shift, the sum of fire protection standards for all chemicals should be no greater than 13 for health risk, 12 for flammability, and 9 for reactivity.
the number to each subset item(health、flammability、reactivity、oxidizer、monomer) within each of the six chemical items being checked(chlorine、ethylene、nickel、phenol、sulfuric、vinyl) cannot exceed the number calculate below in order to line with the rules and pic(1) above, or else the chemical cannot be produced
----> or say, we had to examine whether these six chemical items which require to be checked by the question stem has any subset items exceed the minimum number calculate below in order for us to solve this question
day shift:
(1)monomer、oxydizer no more than 2
oxidizer:
A、C、H、T:only one “yes”, thus in oxidizer subitem “yes” or “no” could both be the answer
monomer:
A、C、H、T: already two “yes”, monomer subitem cannot have one more “yes” /only “no” could be accepted
(2)the sum for health risk no greater than 13; flammability no greater than 12;reactivity no greater than 9
health risk: A+C+H+T=10
each of six health risk subitems being checked cannot exceed 3
flammability: A+C+H+T=6
each of six flammability subitems being checked cannot exceed 6
reactivity: A+C+H+T=4
each of six reactivity subitems being checked cannot exceed 5
night shift:
(1)monomer、oxydizer no more than 2
oxidizer:
A、C、H、T:two “yes”, no more “yes” can appear in the oxidizer subitem/only “no” could be accepted
monomer:
A、C、H、T: only one “yes”, either “yes” or “no” could be accepted in monomer subitem
(2)the sum for health risk no greater than 13;flammability no greater than 12;reactivity no greater than 9
health risk: A+C+H+T=8
each of six health risk subitems being checked cannot exceed 5
flammability: A+C+H+T=8
each of six flammability subitems being checked cannot exceed 4
reactivity: A+C+H+T=7
each of six reactivity subitems being checked cannot exceed 2
to simplify
day shift
health:3 flammability:6 reactivity:5 oxidizer: yes/no monomer: no
night shift
health:5 flammability:4 reactivity:2 oxidizer: no monomer: yes/no
if each one of the six chemical items being checked(chlorine、ethylene、nickel、phenol、sulfuric、vinyl )has one subset item(health、flammability、 reactivity、oxidizer、monomer)exceed the number above or cannot meet the yes-no requirement, then this shift, whether its day shift or night shift, cannot establish
---if both day shift and night shift cannot establish, the answer to this item (among the six) will be “neither”; if both day shift and night shift can establish, the answer will be “either”
after calculation, we get that
the item for “Nickel” is neither
4(health/day shift exceed) , 3 , 3(reactivity/night shift exceed) , no, no
the item for “Phenol” is either
3 , 2 , 0 , no , no
...no subitem exceed in day or night shift
