1. HW 11-3 Reaction profile diagrams
ENERGY

2. Reactants start at 0 energy.
Key Features:
Y-axis = ENERGY
X-axis = Reaction Progress (similar to time)
Reactants start at 0 energy.
TS = HIGHEST energy point at the TOP of the activation barrier. Old bonds being BROKEN new bond being FORMED.
ΔE = energy PRODUCTS – REACTANTS;
Ea = Δ between R and TS

4. 1A AND 1B) EXOTHERMIC RXN PRODUCTS ARE LOWER IN E THAN REACTANTS; ENDOTHERMIC REACTANTS ARE LOWER IN E THAN PRODUCTS

5. A) Ea = +10 kJ/mol ∆E = -10 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +10 kJ/mol ∆E = -10 kJ/mol

6. A) Ea = +10 kJ/mol ∆E = -10 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +10 kJ/mol ∆E = -10 kJ/mol

7. A) Ea = +30 kJ/mol ∆E = +10 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +30 kJ/mol ∆E = +10 kJ/mol

8. A) Ea = +30 kJ/mol ∆E = +10 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +30 kJ/mol ∆E = +10 kJ/mol

9. A) Ea = +25 kJ/mol ∆E = -30 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +25 kJ/mol ∆E = -30 kJ/mol

10. A) Ea = +25 kJ/mol ∆E = -30 kJ/mol
ENERGY
(kJ/mol)
RXN PROGRESS
A) Ea = +25 kJ/mol ∆E = -30 kJ/mol

11. LINK TO NI3 Reaction
ENERGY
(kJ/mol)
RXN PROGRESS

12. RXN PROGRESS Decomposition of NI3:
Small Ea (Touch of a feather sets off reaction
Large ∆E (Large amount of E released)
ENERGY
(kJ/mol)
RXN PROGRESS

13. HW 11-3 catalysts
#5) A catalyst is a substance that SPEEDS UP the rate of a chemical reaction without itself BEING CONSUMED IN THE RXN.

14. Time- Lapse of CoCl2 catalyzed rxn of tartrate and h2O2
HW 11-3, Part 6, #
REACTION DOES NOT OCCUR AT OBSERVABLE RATE WITHOUT CATALYST
Initial
During
Final
Link #6 Catalyst

15. Time- Lapse of CoCl2 catalyzed rxn of tartrate and h2O2
HW 11-3, Part 6, #
Link #6 Catalyst
Initial
During
Final
Catalyst (CoCl2) accelerates the rate of reaction without itself being consumed in the reaction

16. 11-3, #7 catalyst in Ozone decomposition rxn
Cl is the catalyst; It speeds up the breakdown of ozone, but is not used up in the reaction.

17. Higher % successfully jumped lower height barrier1
1/5 x100 = 20% 4
4/5 x100 = 80%

18. HW 11-3, #9: Catalysts accelerate reactions without being consumed by lowering the energy of activation
Lower Ea = Faster rxn
A) ∆E does NOT change
B) Ea is SMALLER
C) LOWERING
Link to collision theory animation

19. Hw 11-3, #10A – What is an enzyme?
A) Enzymes are biological catalysts that speed up the rate of chemical reactions inside your body.

20. Hw 11-3, #10B – Why are enzymes important?
B) Enzymes control the rates of virtually all important chemical reactions in your body.

21. Picture of enzyme catalyst
Active site
Enzyme link
HW 11-3, #10

22. Active site

23. Enzyme active site will only accept specific substrates reactants with correct size and shape