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Author Question: Which takes more energy? A) organic farming B) regular farming C) synthesis of pesticides and ... (Read 128 times)

mp14

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on: Aug 27, 2018
Which takes more energy?
 
  A) organic farming
  B) regular farming
  C) synthesis of pesticides and fertilizers
  D) crop rotation
  E) All of the above are equally energy intensive.

Question 2

Calculate the amount of energy needed to raise the temperature of 25 mL ethanol (density = 0.80 g/mL) from 10.0 C to 20.0 C (c = 0.581 cal/gC) both in cal and joules.
 
  What will be an ideal response?


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coreycathey

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Reply #1 on: Aug 27, 2018
Answer to Question 1

C

Answer to Question 2

Density = mass/ volume; mass of ethanol = 0.80  25 = 20. g;
Heat = mass  specific heat  difference in temperature
= 20.  0.581  10 = 120 cal = 490 joules


mp14

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Reply #2 on: Aug 27, 2018
Thanks


coreycathey

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Reply #3 on: Aug 27, 2018
Welcome :)


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