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FSN Chemistry Unit 4 Exam - Answers (By Collin)
Collin Li:
--- Quote from: "AkirA" ---Question 20 is wrong - it's C, not D. I interpreted it a different way.
--- End quote ---
I have maintained it was C from the beginning. Did you choose D?
Khangfu:
I choose C but mhs is against me XD. Then i got the explanation which makes complete sense.
Collin Li:
--- Quote from: "coblin" ---
--- Quote from: "Khangfu" ---Amount of energy in coal----> many transformation---> electricity. Least amount fo energy from coal
Amount of energy from steam---> mechanical ---> electrical not alot fo energy from steam to electrical
Mechanical --> electrical.
The question asked for the amount of energy in each form converted to electrical. Not how much energy was in the coal initially, in each form... so the chemical energy, a lot of it will be lost and yeah. Really annoying. I know what your saying, that coal has most energy, however most of this energy is lost as waste heat. Not all is converted to electricity. They key is to identify how much of each energy was converted to electricity so basically efficiency.
--- End quote ---
There's no way your interpretation makes sense, since the question says:
"The amount of energy in each of these forms that take part in the generation of a fixed quantity of electricity is, from lowest to highest."
For a fixed quantity of electricity, the amount of energy is 100% from the coal, steam and the turbine, it's just that the coal, steam and turbine also produced other forms of energy.
We actually need to find out, for a fixed quantity of electricity, how much input do we need of each form of energy so that we will get that same fixed quantity of electricity. This then answers the question: which forms of energy require the most "energy input" in order to yield the fixed quantity of electricity we are supposed to produce.
--- End quote ---
This is the explanation that makes complete sense, IMO. I reckon MHS is wrong. I'm an ex-MHS guy, I'm better than you guys, mwahahaha! (Just kidding, *meep* don't hurt me plz)
Khangfu:
--- Quote from: "coblin" ---
--- Quote from: "coblin" ---
--- Quote from: "Khangfu" ---Amount of energy in coal----> many transformation---> electricity. Least amount fo energy from coal
Amount of energy from steam---> mechanical ---> electrical not alot fo energy from steam to electrical
Mechanical --> electrical.
The question asked for the amount of energy in each form converted to electrical. Not how much energy was in the coal initially, in each form... so the chemical energy, a lot of it will be lost and yeah. Really annoying. I know what your saying, that coal has most energy, however most of this energy is lost as waste heat. Not all is converted to electricity. They key is to identify how much of each energy was converted to electricity so basically efficiency.
--- End quote ---
There's no way your interpretation makes sense, since the question says:
"The amount of energy in each of these forms that take part in the generation of a fixed quantity of electricity is, from lowest to highest."
For a fixed quantity of electricity, the amount of energy is 100% from the coal, steam and the turbine, it's just that the coal, steam and turbine also produced other forms of energy.
We actually need to find out, for a fixed quantity of electricity, how much input do we need of each form of energy so that we will get that same fixed quantity of electricity. This then answers the question: which forms of energy require the most "energy input" in order to yield the fixed quantity of electricity we are supposed to produce.
--- End quote ---
This is the explanation that makes complete sense, IMO. I reckon MHS is wrong. I'm an ex-MHS guy, I'm better than you guys, mwahahaha! (Just kidding, *meep* don't hurt me plz)
--- End quote ---
im not from mhs XD i just discussed answer with friend dere
cara.mel:
khangfu I interpreted it the same way as you =P
I'm under the impression we're wrong, C's right. Oh well.
Doubt they'd accept both answers unless our side got some serious weight behind it
I don't care too much about it but.
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