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Cell Metabolism Part 1 Concept Review

Last updated almost 8 years ago

16 questions

Note from the author:

A review assignment examining the   foundational concepts of energy and energy stored in chemical bonds.

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Look at each of the processes shown above, then discuss with a friend, if it is endergonic or exergonic. In each case, does enthalpy increase or decrease, and does entropy increase or decrease?

Question 9

9.

Consider a pendulum swinging. Which type(s) of
energy is/are associated with the pendulum in the
following instances:
i. the moment at which it completes
one cycle, just before it begins to fall back towards the
other end,
ii. the moment that it is in the middle between
the two ends,
iii. just before it reaches the end of one cycle
(just before instant i.).

a. i. potential and kinetic, ii. potential and kinetic,
iii. kinetic

b. i. potential, ii. potential and kinetic, iii. potential
and kinetic

c. i. potential, ii. kinetic, iii. potential and kinetic

d. i. potential and kinetic, ii. kinetic iii. kinetic

Question 10

10.

Which of the following comparisons or contrasts
between endergonic and exergonic reactions is false?

a. Endergonic reactions have a positive ΔG and
exergonic reactions have a negative ΔG

b. Endergonic reactions consume energy and
exergonic reactions release energy

c. Both endergonic and exergonic reactions require
a small amount of energy to overcome an
activation barrier

d. Endergonic reactions take place slowly and
exergonic reactions take place quickly

Question 11

11.

Which of the following is the best way to judge the
relative activation energies between two given chemical
reactions?

a. Compare the ΔG values between the two
reactions

b. Compare their reaction rates

c. Compare their ideal environmental conditions

d. Compare the spontaneity between the two
reactions

Question 12

12.

Which of the following is not an example of an energy
transformation?

a. Turning on a light switch

b. Solar panels at work

c. Formation of static electricity

d. None of the above

Question 13

13.

Label each of the following systems as high or low
entropy: i. the instant that a perfume bottle is sprayed
compared with 30 seconds later, ii. an old 1950s car
Chapter 6 | Metabolism 189
compared with a brand new car, and iii. a living cell
compared with a dead cell.

a. i. low, ii. high, iii. low

b. i. low, ii. high, iii. high

c. i. high, ii. low, iii. high

d. i. high, ii. low, iii. Low

Question 15

15.

Explain in your own words the difference between a
spontaneous reaction and one that occurs instantaneously,
and what causes this difference.