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FSN Chemistry Unit 4 Exam - Answers (By Collin)

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ninwa:
Thank you so much for that coblin :) sigh, I'm shattered, I worked way too hard for this exam to lose marks because I made idiotic mistakes :cry:

Oh well, at least now I can make a realistic prediction of how I went and so won't be disappointed on December 17 :)

Khangfu:
Actually it does ask for efficiency. It says the amount fi each, not how much each one contributes.

Let me elaborate. The energy converted from turbine to electricity is highest. Nearly all of it is converted. Hence most of the energy ni turbine is converted. Coal on the otherhand most fo energy in it is lost. Hence not amount of energy in coal is converted to electricity.

Look at it this way. Nearly ALL of the energy spinning turbine is converted to electricity. Hence it has the greatest amount of its energy converted. if that makes any sense. The coal most of its energy is lost as heat. NOT ALL ENERGY IN COAL GOES TO MAKE ELECTRICITY!

bilgia:
gosh i made heaps of little errors in section B....lost like 10marks there..guess that leaves me hopefully with a mid A...
with a B+ midyr exam score, A+ sacs and A here what ss is possible

Khangfu:
OK i got a clear explanation to 20. It asks for how much of each step converts to electricity. Hence coal is least. NOT ALL OF COAL GOT TURNED INTO ELECTRICITY. However most of the energy from spinning turbine did . There we go =D

Edit: Omg my english so bad. Manual wipe after vce XD

Collin Li:

--- Quote from: "Khangfu" ---OK i got a clear explanation to 20. It asks for how much of each step converts to electricity. Hence coal is least. NOT ALL OF COAL GOT TURNED INTO ELECTRICITY. However most of the energy from spinning turbine did . There we go =D

Edit: Omg my english so bad. Manual wipe after vce XD
--- End quote ---



--- Quote from: "Multiple Choice: Q20" ---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
--- End quote ---


Let's say we wanted to create 300 units of electricity: this is the fixed quantity we require. We need much more coal for that, than we do for steam energy, than we do for mechanical energy.

It doesn't ask how much of a "fixed amount of energy" in each of these forms makes a portion of a final electricity output, instead it says we are to produce a fixed quantity of electricity (i.e.: 300 units), so we must find the order: highest to lowest of energy units in terms of other energy forms that will result in this output.

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