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Lecture 2

BIOL 1201 Lecture Notes - Lecture 2: Exothermic Process, Endothermic Process, Regin


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Bill Wischusen
Lecture
2

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BIOL 1201 CLICKER QUESTIONS 2
1. WHAT HAPPENED DURING REACTION (LIGHTING A MATCH)? HEAT
ENERGY WAS RELEASED.
a. H (-) AND T (-) AND S IS (+), OVERALL CHANGE IS (-) SO IT IS
SPONTANEOUS.
b. Exothermic process
2. WHAT HAPPENED DURING THE REACTION (MIXING A COOL PACK)? IT WAS
SPONTANEOUS.
a. Is something is spontaneous, G has to be (-)… enthalpy increases so T is (+)…
entropy also increases so S is (+), but TS is still overall (-).
b. Endothermic process, driven by enthalpy and entropy changes.
3. WHICH OF THE FOLLOWING REACTIONS WILL ALWAYS BE SPONTANEOUS?
ENTHALPY DECREASES, ENTROPY INCREASES.
4. WHICH OF THE FOLLOWING REACTIONS WILL ALWAYS BE NON-
SPONTANEOUS? ENTHALPY INCREASES, ENTROPY DECREASES.
5. WHICH IS GOING TO OCCUR MORE OFTEN? (PHOSPHOLIPID PICTURE) A.
a. Lateral movement occurs very often and flip-flopping almost never happens.
6. THE HIGHLIGHTED REGIN OF THE INTEGRAL PROTEIN WOULD BE
EXPECTED TO CONTAIN: NON-POLAR AMINO ACIDS.
a. Protein is not fixed there, so therefore it isn’t just polar. Type of protein
determines type of amino acids.
7. THE HIGHLIGHTED REGION OF THE PERIPHERAL PROTEIN WOULD BE
EXPECTED TO CONTAIN: POLAR AMINO ACIDS.
8. WHICH OF THESE DAMS HAS A GREATER GRADIENT THAN THE ONE ON
THE LEFT? B
a. The difference is greater between the two levels… important for gradients.
a.i. not the total amount.
9. WHICH OF THESE HAS A SMALLER GRADIENT THAN THE ONE ON THE
LEFT? A AND C
10. ON WHICH SIDE DO THE MOLECULES HAVE GREATER ENTROPY? (A HAS
MULTIPLE MOLECULES AN B ONLY HAS TWO) B.
11. ON WHICH SIDE DO THE MOLECULES HAVE GREATER FREE ENERGY? (A
HAS MULTIPLE MOLECULES AND B ONLY HAS TWO MOLECULES) A.
a. Entropy is inversely related to free energy… if entropy increases, free energy
decreases.
12. THE NET MOVEMENT OF MOLECULES WILL BE TOWARD WHAT SIDE? (A
HAS MULTIPLE MOLECULES AND B HAS ONLY TWO) B.
a. Move from high free energy to low free energy.
13. WHAT HAPPENS TO THE ENERGY OF THE MOLECULES AS THEY MOVE
FROM SIDE A TO SIDE B? THEY GIVE OFF ENERGY.
14. ON WHICH SIDE ARE THERE MORE WATER MOLECULES? B.
15. ON WHICH SIDE DOES THE WATER HAVE GREATER ENTROPY? A.
16. THE NET MOVEMNT OF WATER WILL BE TOWARDS SIDE? A.
a. Moving down its own free energy gradient.
17. THE NET MOVEMENT OF WATER WILL BE TOWARDS SIDE? B.
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