Chapter 9- Energetics (Nov 22)

Question 1

energy metabolism is essentially ___

Answer 1

combustion

Question 2

Hess’ Law=

Answer 2

regardless of the number of steps of reaction, the total energy change will be the same

Question 3

analogy for Hess’ Law

Answer 3

no matter which pathway you take from the bottom to the top of a mountain, the elevation change will be the same
(can take switchbacks or go straight up)

Question 4

1st law of thermodynamics=

Answer 4

energy can be converted among forms but cannot be created nor destroyed

Question 5

which 2 laws are fundamental to energetics in animals

Answer 5

• 1st law of thermodynamics

- Hess’ law

Question 6

direct calorimetry=

Answer 6

direct heat measurement (using a thermometer- you directly measure the heat)

Question 7

explain the parts of a direct calorimeter

Answer 7

• animal goes inside
• outside layer us ice water
• inside layer is ice
• water is measured at bottom

Question 8

difficulties with direct calorimeters?

Answer 8

hard to fit large animals in them

Question 9

indirect calorimetry=

Answer 9

measures O2 in and CO2 out (indirectly measures the heat)