This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which takes more energy? A) organic farming B) regular farming C) synthesis of pesticides and ... (Read 67 times)

mp14

  • Hero Member
  • *****
  • Posts: 534
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?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

coreycathey

  • Sr. Member
  • ****
  • Posts: 333
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

  • Hero Member
  • *****
  • Posts: 534
Reply #2 on: Aug 27, 2018
Thanks


coreycathey

  • Sr. Member
  • ****
  • Posts: 333
Reply #3 on: Aug 27, 2018
Welcome :)


« previous next »
 

Did you know?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

The activation energy barrier. The activation energy barrier.
The coupling of reactions in energy transfer. The coupling of reactions in energy transfer.
Energy Energy
Synthesis of polar head groups of bacterial phospholipids Synthesis of polar head groups of bacterial phospholipids
Synthesis of coenzymes Synthesis of coenzymes
Energy Transfer Energy Transfer
Video: Energy sources - types

For a complete list of videos, visit our video library