🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
HomeClass Notes1,200,000US530,000

CHEM 102 Lecture Notes - Lecture 16: Insecticide, Reaction Rate Constant

39 views2 pages
School
UNC
Department
Chemistry
Course
CHEM 102
Professor
All

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Chem 102: general descriptive chemistry ii lecture 16: integrated rate laws and half-life (3/17/15) Why we care about integrated rate laws: they tell us how concentration of a reactant is changing over time, regular rate laws do not include the variable of time. If a reaction is 1st order, the plot of ln[a] versus time will be a straight line with a slope of k. Example problem: an insecticide is decomposing in water at 12 degrees celsius. The insecticide contaminates a lake with initial concentration of 5. 0 x. What is the concentration of insecticide after 1 year: ln [a]1 year = -kt + ln (5. 0 x 10-7 g x cm3, ln[a]1 year = -15. 96, [a]1 year = e-15. 96, = 1. 2 x 10-7 g x cm3. Second order processes: formula, (1 / [a]t) = kt + (1 / [a]0, looks like equation for a line, plot of concentration versus time reveals a straight line where the rate constant is the slope.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related textbook solutions

Chemistry: Structure and Properties
2 Edition,
Tro
ISBN: 9780134293936
Basic Chemistry
5 Edition,
Timberlake
ISBN: 9780134138046
Principles of Chemistry Molecular Approach
4th Edition,
Tro
ISBN: 9780134112831
Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944
Chemistry: Structure and Properties
2nd Edition,
Tro
ISBN: 9780134293936
Chemistry: A Molecular Approach
3rd Edition,
Tro
ISBN: 9780321809247
Chemistry: A Molecular Approach
5th Edition,
Tro
ISBN: 9780134874371
Principles of Chemistry: A Molecular Approach
4th Edition,
Tro
ISBN: 9780134895741
Chemistry: The Central Science
14th Edition, 2017
Brown
ISBN: 9780134414232

Related Documents

CHEM 102 Lecture Notes - Lecture 26: Geiger Counter, Nuclear Transmutation, Ionizing Radiation
sangriagerbil496
Chemistry 1027A/B
Final Exam
Study Guide
Chemistry 1027A/B Study Guide - Final Guide: Rate-Determining Step, Rate Equation, Arrhenius Equation
goldmallard877
CHEM102 Lecture Notes - Lecture 3: Rate Equation, Bayerischer Rundfunk, Torr
crimsonpanda122

Related Questions

The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b.

Order Integrated Rate Law Graph Slope
0 [A]=?kt+[A]0 [A] vs. t ?k
1 ln[A]=?kt+ln[A]0 ln[A] vs. t ?k
2 1[A]= kt+1[A]0 1[A] vs. t k

Part A

The reactant concentration in a zero-order reaction was 5.00×10?2M after 175 s and 4.00×10?2M after 400 s . What is the rate constant for this reaction?

Part B

What was the initial reactant concentration for the reaction described in Part A?

Part C

The reactant concentration in a first-order reaction was 6.40×10?2M after 50.0 s and 4.60×10?3M after 60.0 s . What is the rate constant for this reaction?

Part D

The reactant concentration in a second-order reaction was 0.730 M after 210 s and 6.40×10?2M after 705 s . What is the rate constant for this reaction?

The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b.

1.) The reactant concentration in a zero-order reaction was 6.00×10−2M after 165 s and 3.50×10−2Mafter 385 s . What is the rate constant for this reaction?

2.)What was the initial reactant concentration for the reaction described in Part A?

3.)The reactant concentration in a first-order reaction was 6.70×10−2

M after 40.0 s and 2.50×10−3Mafter 95.0 s . What is the rate constant for this reaction?

4.)The reactant concentration in a second-order reaction was 0.850

M after 255 s and 3.40×10−2M after 860 s . What is the rate constant for this reaction?

Order Integrated Rate Law Graph Slope
0 [A]=−kt+[A]0 [A] vs. t −k
1 ln[A]=−kt+ln[A]0 ln[A] vs. t −k
2 1[A]= kt+1[A]0 1[A] vs. t k

The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b.

Order Integrated Rate Law Graph Slope
0 [A]=−kt+[A]0 [A] vs. t −k
1 ln[A]=−kt+ln[A]0 ln[A] vs. t −k
2 1[A]= kt+1[A]0 1[A] vs. t k

Part A The reactant concentration in a zero-order reaction was 0.100 M after 195 s and 1.50×10−2 M after 330 s . What is the rate constant for this reaction?

Part B What was the initial reactant concentration for the reaction described in Part A?

Part C The reactant concentration in a first-order reaction was 6.90×10−2 M after 10.0 s and 8.10×10−3 M after 100 s . What is the rate constant for this reaction?

Part D The reactant concentration in a second-order reaction was 0.130 M after 215 s and 6.10×10−2 M after 845 s . What is the rate constant for this reaction? Please show your work.