the vertical axis is labeled Energy (KJ/MOL) and the horizontal
axis is labeled Time or Reaction Progress (seconds or
minutes)
in the graph....
draw a straight short horizontal line. write the reactant component
of the reaction on it. eg. HCl + NaOH
from the end of the line draw a curve (a maximum curve) and at the
end of the curve draw another straight horizontal line and on it
write the product component of the reaction eg. H2O + NaCl.
Since this was an exothermic reaction, the reactant line is higher
than the product line. For an endothermic reaction, the reactant
line is below the product line.
Exothermic reaction - Negative enthalpy change.
Endothermic reaction - Positive enthalpy change.
the enthalpy change is measured from the reactant line TO the
product line, and read off the vertical axis.
Activation energy is the vertical length from the reactant line to
the maximum of the curve.
Draw an energy diagram for each of the reactions described below. Properly label each diagram, including...
Based on the energy diagram below: + + a) Label the axes of the graph (energy is in units of mo! b) What is the energy of the reactants? c) What is the energy of the products? d) What is the energy of the transition state? e) Calculate the activation energy of the forward reaction (reactants products) f) Calculate the activation energy of the reverse reaction (products reactants): g) Calculate the total energy of the forward reaction: h) Calculate the...
Model 1 - Potential Energy Diagrams 1) The energy (enthalpy) change of a reaction can be determined by the following expression: Activated Complex Transition State AH = Energy products - Energy reactants Activation Energy, E Reactants Consider the energy change for the reaction in Model 1 (the graph to the left). Potential Energy (kJ/mol) Energy change (AH) Products a) The energy change shown is (positive/negative). b) This reaction is (endothermic / exothermic). c) These (reactants / transition state) has more...
8. A). Draw a Free energy diagram for each of the following reactions below. In your diagram indicate the Free energy of activation (AG°*) and the overall free energy change (AG®rxn) B). Determine which side of the equilibrium is favored (products or reactants). C). Calculate the relative equilibrium constant for each the reaction. (Hint: use pkas) NH2 ONH NaOH H20 + pka 27 NH3 NH2 + HO + NaOH pka = 4.6
8. A). Draw a Free energy diagram for each of the following reactions below. In your diagram indicate the Free energy of activation (AGⓇ) and the overall free energy change (AGºra) (10 points) B). Determine which side of the equilibrium is favored (products or reactants). (5 points) C). Calculate the relative equilibrium constant for each the reaction. (Hint: use pKas) (5 points) NH2 @NH NaOH HC pk = 27 NH NH2 NaOH H.0 pka 4.6 SI
8. A). Draw a Free energy diagram for each of the following reactions below. In your diagram indicate the Free energy of activation (ΔG° ± ) and the overall free energy change (ΔG°rxn) B). Determine which side of the equilibrium is favored (products or reactants). C). Calculate the relative equilibrium constant for each reaction. (Hint: use pKas) NH2 O:NH NaOH HO F pka = 27 É ŅHz+ ŅH2 + + NaOH HO F É pKa = 4.6
Part 2 Multiple Choice. Select the best answer for each of the questions below: 1. Which of these molecules is not an electrophile? a) CH4 b) CH3+ c) H* d) BF3 2. Which of these molecules is not a nucleophile ? a) NH3 b) OH c) CN d) H* 3. Water behaves as: a) a nucleophile b) an electrophile c) both d) neither 4. The SN2 reaction has how many steps? a) 1 b) 2 c) 3 d) 4 5....
7. Using the following reaction progress diagram, answer the questions below: wiring Energy A G Rxn. a. How many steps are in the reaction? How do you know? (4 points) b. Which letter corresponds to the rate-determining-step? Explain your choice. (6 points) c. Is the reaction exothermic or endothermic? How do you know? (4 points) d. If the energy at point B is lowered, what will happen to the rate of the reaction will it increase, decrease, or stay the...
only questions number: #3,6,8,16,19,22 Δι CH 122 - Practice Problems for Chapter 12 Do NOT use this problem set solely as test preparation. This problem set does NOT cover everything that we have discussed in class. You will still need to study class materials in order to do well on the learning assessment. 1. Of the following all are valid units for a reaction rate except A. moll B. M/S C. molhr D.g's E.molle 2. Which one of the following...
just one example/demonstration! Data needed to be calculated is in highlighted in green boxes. And I highlighted in red an equation (not sure if thats what you use to calculate it) And ignore the lab instructions on completeing a graph!! I already know how to do that in excel, just curious how Ln (relative rate) and 1/T in K^-1 is calculated by hand* here is the rest of that lab leading up to the question as I know its typically...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...