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Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4- 15 Determine the order of the reaction. Either show work or explain!
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Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Jan 03, 2016

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Page 1: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Question of the Day

For a reaction involving a single reactant, the following data were obtained.

Day 2 4-15

Determine the order of the reaction. Either show work or explain!  

Page 2: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Question of the Day

Does an oreo get soggy quicker in milk or a milkshake? Explain the difference in reaction rate in terms of one of the four factors influencing reaction rates (BE SPECIFIC!)

Day 3 4-16

Page 3: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.
Page 4: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

http://wps.prenhall.com/esm_brown_chemistry_9/2/660/169060.cw/index.html

Homework # 2 Chapter 14 – w/ discussion partner – show me successful screen (100%)

# 7 = the reaction rate would quadruple. doubling the partial pressure is the same as doubling the concentration.

Page 5: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Question of the DayThe following data were collected for the rate of disappearance

of NO in the reaction: 2NO(g) + O2(g) 2NO2(g)  

Write the rate law for this equation: _______________________ 

Solve for k: 

What are the units for k?

Day 5 4-22

Page 6: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Rxn Mechanisms & Rate-Determining StepsA. A reaction mechanism is a series of ____________ that lead to a net reaction.

B. Reaction mechanisms can have _____________ steps.

C. Parts of mechanisms

1. Net reaction is _________

simple rxns

one or more

the goal

Page 7: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Rxn Mechanisms & Rate-Determining StepsC. Parts of mechanisms

1. Net reaction is __________

2. Elementary step is one of the __________ in the ________

3. Intermediate product is a product that is made by _______________ _____ that becomes a _________ in a subsequent ________________

the goal

reactions process

an elementarystep reactan

telementary step

Page 8: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Rxn Mechanisms & Rate-Determining StepsC. Parts of mechanisms

4. Catalyst is a substance that first appears as a _________ in one ________________ and then becomes a ________ in a subsequent ________________

reactantelementary stepproductelementary step

Page 9: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Reaction mechanisms that have multiple steps have one step that is the rate-determining step. The rate-determining step is the step that is the _______ of all the steps.

Rxn Mechanisms & Rate-Determining Steps

slowest

Page 10: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Postlabs are due on Wednesday 4-23

Lab reports and presentations are due Friday 4-25

Page 11: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

E. Write several mechanisms and identify any intermediates and catalysts.

1. 1-step mechanism for reaction of calcium oxide with water

Rxn Mechanisms & Rate-Determining Steps

Page 12: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Question of the DayDay 6 4-23

Describe how intermediates, activated complexes, and catalysts are different (thoroughly!).

Page 13: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

http://wps.prenhall.com/esm_brown_chemistry_9/2/660/169060.cw/index.html

Homework # 2 Chapter 14 – w/ discussion partner – show me successful screen (100%)

# 7 = the reaction rate would quadruple. doubling the partial pressure is the same as doubling the concentration.

Page 14: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

E. Write several mechanisms and identify any intermediates and catalysts.

2. 2-step mechanism for rxn of NO2 with CO to produce NO and CO2 (all gases)

Rxn Mechanisms & Rate-Determining Steps

NO2 + NO2 NO3 + NO

NO3 + CO NO2 + CO2

slow

fast

NO2 + CO NO + CO2 net

Period 1 stopped

4-22

Page 15: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

2. 2-step mechanism for rxn of NO2 with CO to produce NO and CO2 (all gases)

Rxn Mechanisms & Rate-Determining Steps

NO2 + NO2 NO3 + NO

NO3 + CO NO2 + CO2

slow

fast

NO2 + CO NO + CO2 net

Intermediate =NO3

Page 16: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

E. Write several mechanisms and identify any intermediates and catalysts.

3. 3-step mechanism for the rxn of HBr with O2 to produce H2O and Br2 (all gases)

Rxn Mechanisms & Rate-Determining Steps

HBr + O2 HOOBr

HBr + HOOBr 2 HOBr

2 HBr + 2 HOBr 2 H2O + 2 Br24 HBr + O2 2 H2O + 2 Br2

Page 17: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

3. 3-step mechanism for the rxn of HBr with O2 to produce H2O and Br2 (all gases)

Rxn Mechanisms & Rate-Determining Steps

HBr + O2 HOOBr

HBr + HOOBr 2 HOBr

2 HBr + 2 HOBr 2 H2O + 2 Br24 HBr + O2 2 H2O + 2 Br2

Intermediates =HOOBr and HOBr

Page 18: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

4. Write the net rxn for the following 2-step mechanism.

NO2(g) + SO2(g) → NO(g) + SO3(g)

2 NO(g) + O2(g) → 2 NO2(g)

Rxn Mechanisms & Rate-Determining Steps

Page 19: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

ReviewAnalyze the following reaction mechanism:

step 1: N2O N2 + Ostep 2: N2O + O N2 + O2

What is the net reaction?

Are there any intermediates and/or catalysts present?

Page 20: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Equilibrium Equilibrium occurs when the forward and

reverse reactions occur at equal rates – NOT a standstill!

Page 21: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Equilibrium

A. Physical Equilibrium Example

1. H2O(l) ⇄ H2O(g)

2. Appearance of system

Rate of Evap. = Rate of Cond.Rate of Evap. = Rate of Cond.

To regular eyes: To regular eyes: Looks as if nothing is Looks as if nothing is happeninghappening

But on the molecular level: But on the molecular level: 2 rxns or 2 rxns or s occur s occur simultaneouslysimultaneously

Page 22: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

B. Chemical Reaction Options

1. Rxn goes to completion products stay & reaction stops; Ex : burning 2. No go : He + Ne no rxn3. Rxn reaches equilibrium = get a set

amount of reactants & products coexisting

C. Main Concern of Equilibrium Calculations

1. How FAR will the reaction go?2. How much product can be made?

Equilibrium

Page 23: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

D. What conditions must be met to attain equilibrium?

– Constant T & P– Closed container– G = 0

Equilibrium

Page 24: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

E. Example equilibrium system and experimental data: 2 HI(g) I⇄ 2(g) + H2(g)

[HI] [I2] [H2] → [HI] [I2] [H2]

Exp #1 0.2 0 0 →

Exp #2 0 0.1 0.1 →

Exp #3 0.1 0.1 0.1 →

0.160.16 0.020.02 0.020.02

0.160.16 0.020.02 0.020.02

0.240.24 0.030.03 0.030.03

Equilibrium

Page 25: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

• What happened to the concentrations of each substance during the experiments?

– Exp #1 & #2 •Changed to form chemicals not

present at the start of the reaction

– Exp #3•Changed to form more of the “favored” chemicals

Equilibrium

Page 26: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

C. Example of system reaching equilibrium

N2O4(g) ⇄ 2 NO2(g) at 100 °C

Time (s) 0 20 40 60 80 100

[N2O4] 0.100 0.070 0.050 0.040 0.040 0.040

[NO2] 0.000 0.060 0.100 0.120 0.120 0.120

Equilibrium

Page 27: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.
Page 28: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Stopped on 4-2

Page 29: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Assignment:

Review section 18.2 and complete #s 9-16 on page 608.

Page 30: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.
Page 31: Question of the Day For a reaction involving a single reactant, the following data were obtained. Day 2 4-15 Determine the order of the reaction. Either.

Period # 1 LAB