Search found 42 matches

by 905084274
Wed Mar 13, 2019 11:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788732

Re: Post All Chemistry Jokes Here

If Avogadro calls, tell him to leave his number.
by 905084274
Wed Mar 13, 2019 11:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788732

Re: Post All Chemistry Jokes Here

All the best chemistry jokes...Argon
by 905084274
Wed Mar 13, 2019 11:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788732

Re: Post All Chemistry Jokes Here

In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.

When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate determining step”.
by 905084274
Wed Mar 06, 2019 9:22 pm
Forum: Second Order Reactions
Topic: multiple choice rate
Replies: 1
Views: 18

multiple choice rate

For a reaction 2A + B 2C, with the rate equation: Rate = k[A]2[B] (a) the order with respect to A is 1 and the order overall is 1. (b) the order with respect to A is 2 and the order overall is 2. (c) the order with respect to A is 2 and the order overall is 3. (d) the order with respect to B is 2 an...
by 905084274
Wed Mar 06, 2019 9:21 pm
Forum: Second Order Reactions
Topic: multiple choice kinetics
Replies: 1
Views: 17

multiple choice kinetics

The speed of a chemical reaction (a) is constant no matter what the temperature is. (b) is independent of the amount of contact surface of a solid involved. (c) between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is great. (d) between ions in aque...
by 905084274
Wed Mar 06, 2019 8:32 pm
Forum: Second Order Reactions
Topic: unique rate
Replies: 1
Views: 23

unique rate

What is a unique rate of a problem in kinetics? for example 6th edition textbook number 15.3 (c) - the answer key doesn't have a section for this...
by 905084274
Wed Feb 27, 2019 9:49 am
Forum: Balancing Redox Reactions
Topic: salt bridge vs porous disk
Replies: 4
Views: 35

salt bridge vs porous disk

What happens if there is no salt bridge in a galvanic cell? also what is the difference between a salt bridge and a porous disk? How does that affect the lines you draw
by 905084274
Wed Feb 27, 2019 9:47 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: draw galvanic cell
Replies: 3
Views: 37

draw galvanic cell

For the upcoming exam this week will we be expected to know how to draw out a Galvanic cell?
by 905084274
Wed Feb 27, 2019 9:45 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 5249

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Did Karen post her most recent handout answer key that we weren't able to go over in session?
by 905084274
Wed Feb 27, 2019 9:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: E^o(cell) vs. Ecell
Replies: 6
Views: 38

Re: E^o(cell) vs. Ecell

^o means it is at standard conditions, this also can be applied to G or S
by 905084274
Thu Feb 21, 2019 9:54 am
Forum: Balancing Redox Reactions
Topic: k from lnK
Replies: 5
Views: 53

k from lnK

how do you find the K value from lnK. For example in problem 11.19 a and b from 6th edition? I never learned this and the solutions manual skips the process...
by 905084274
Wed Feb 20, 2019 7:40 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: anode reversal
Replies: 1
Views: 25

anode reversal

what is the difference between an anode before and after reversal? ex: 6th addition problem 14.11
by 905084274
Wed Feb 20, 2019 7:39 pm
Forum: Balancing Redox Reactions
Topic: H+ vs H3O+
Replies: 10
Views: 68

Re: H+ vs H3O+

It should not matter because they mean the same thing, but the textbook prefers H+
by 905084274
Wed Feb 20, 2019 12:09 pm
Forum: Ideal Gases
Topic: overall grade points
Replies: 2
Views: 51

overall grade points

How many overall points minimum do you need to get a B- or a B in this class. The syllabus only states that 250/500 is a C-.
by 905084274
Mon Feb 11, 2019 9:43 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: ideal gases and reactions
Replies: 1
Views: 28

ideal gases and reactions

How do ideal gases affect a reaction? I know that it may change the C value such as 5/2R or 3/2R
by 905084274
Mon Feb 11, 2019 9:42 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: cooling a system
Replies: 3
Views: 30

cooling a system

If you cool a system how does it affect the reaction?
by 905084274
Mon Feb 11, 2019 9:41 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework during midterm week [ENDORSED]
Replies: 5
Views: 67

Homework during midterm week [ENDORSED]

What is the homework for this week? Is there a specific topic we should do problems for? (We aren't learning any new concepts this week)
by 905084274
Tue Feb 05, 2019 10:13 pm
Forum: Administrative Questions and Class Announcements
Topic: negative and positive entropy
Replies: 3
Views: 44

negative and positive entropy

What represents a negative change in entropy and a positive one? based on the type of reaction
by 905084274
Tue Feb 05, 2019 10:07 pm
Forum: Phase Changes & Related Calculations
Topic: isothermal vs reversible
Replies: 1
Views: 19

isothermal vs reversible

if something is isothermal should you always assume that it is also reversible? what is the difference between the two
by 905084274
Tue Feb 05, 2019 9:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: thermo equation explanation
Replies: 4
Views: 53

thermo equation explanation

What are you calculating with this equation: delt S (entropy) = q/T and why does T need to be in K?
by 905084274
Wed Jan 30, 2019 10:42 pm
Forum: Ideal Gases
Topic: derivatives and integrals
Replies: 6
Views: 56

derivatives and integrals

Can someone explain what Lavelle was going over in lecture today about how dV or the derivative in V solves for something? And also I don't understand why the main equation we went over today involves taking an antiderivative/integral. Is this because we want to solve for the derivative and find the...
by 905084274
Wed Jan 30, 2019 10:40 pm
Forum: Ideal Gases
Topic: pH and pOH
Replies: 18
Views: 161

Re: pH and pOH

Typically if you are given a base, you solve for pOH, but if you are asked to find the pH, then you must convert from pOH to pH by using this formula: -14.00 = pOH + pH. Or 14.00 - pOH = pH
by 905084274
Wed Jan 30, 2019 10:38 pm
Forum: Ideal Gases
Topic: breaking bond - heat released and gained
Replies: 5
Views: 58

breaking bond - heat released and gained

I have a question related to both Biology and Chemistry. When I was at a PLF today for lifesci 7A, they said that when you break a bond, you go from high potential E to low potential E, which means that it is exergonic, because you release energy. However, I was told last quarter in chemistry that i...
by 905084274
Sun Jan 27, 2019 6:16 pm
Forum: Administrative Questions and Class Announcements
Topic: thermo equations
Replies: 1
Views: 37

thermo equations

What are the main equations used for Thermodynamics that we should get comfortable with and what do they solve for?
by 905084274
Tue Jan 22, 2019 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 5249

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

for problem 4 on the second worksheet, how do you find the concentration of CO3 2- you are given the concentration of H2CO3
by 905084274
Tue Jan 22, 2019 9:12 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 5249

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

can you please explain the steps of this question on worksheet 2: How many grams of formic acid, HCOOH, do you need to prepare 1.00L of a pH 3.26
solution? Ka of formic acid = 1.8 x 10-4? I have no idea how to solve
by 905084274
Mon Jan 21, 2019 8:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: help with homework 12.57
Replies: 2
Views: 45

help with homework 12.57

can someone explain step by step how you solve 12.57 6th edition. I think the solutions manual is incorrect or is just confusing...
by 905084274
Mon Jan 21, 2019 8:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solving for pka and ka and ph
Replies: 2
Views: 21

solving for pka and ka and ph

what does 10-ph equal?
by 905084274
Mon Jan 21, 2019 7:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: how to determine if something is an acid or base
Replies: 4
Views: 36

how to determine if something is an acid or base

How can you easily identify is something is going to work as an acid or a base in an aqueous solution. For example, in hw 12.55 6th edition, CH3COOH serves as an acid, but it has an OH group, so I would think it would work as a base....Will it be more clear to identify on the test?
by 905084274
Mon Jan 21, 2019 7:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pka and ka
Replies: 1
Views: 19

Pka and ka

does lower pka mean that it's a stronger acid? and does high ka go with strong acid as well?
by 905084274
Thu Jan 17, 2019 9:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: writing equations
Replies: 1
Views: 29

writing equations

If you were to be given a base - such as Bf3(OH)- and you knew that you needed to make an equation to solve. How would you set it up? What is the rule of thumb and how to you know when to add water?
by 905084274
Tue Jan 15, 2019 9:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: help with equilibrium equations
Replies: 1
Views: 27

help with equilibrium equations

How do you know how to rewrite the equation in homework problem 12.37. For example, it asks for weak acids to write the equilibrium equation and Ka value and if its a weak base to write the equation and Kb. It also asks about conj base. So for part (a) it asks this for HClO2 and I wrote the expressi...
by 905084274
Mon Jan 14, 2019 6:32 pm
Forum: General Science Questions
Topic: conceptual question about brackets
Replies: 1
Views: 69

conceptual question about brackets

what does it mean when you put a zero around a base...for example: (Ba(OH)2)0. It shows this on the answer key for 12.25
by 905084274
Mon Jan 14, 2019 6:24 pm
Forum: General Science Questions
Topic: molarity question
Replies: 2
Views: 51

molarity question

For the 6th edition textbook homework 12.23 part (a), how do you know that since the Kw provided is 2.1x10^-14 that that is equivalent to x^2. So the problem can be set up as (H3O+)(OH-)=x^2. Is this because if you take the square root of 2.1x10^-14 is 1.4x10^-7 mol/L? I wouldn't have thought of thi...
by 905084274
Thu Jan 10, 2019 9:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: lavelle's email
Replies: 1
Views: 37

lavelle's email

what is Lavelle's email address? I couldn't find it on the website
by 905084274
Tue Jan 08, 2019 6:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: hw questions - points
Replies: 9
Views: 100

Re: hw questions - points

I understand that homework points are separate. But can you ask questions on chemistry community about homework and have that count toward your 3 points?
by 905084274
Tue Jan 08, 2019 6:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: hw questions - points
Replies: 9
Views: 100

hw questions - points

Do homework questions count towards our weekly 3 discussion points?
by 905084274
Tue Jan 08, 2019 6:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: liquid vs aqueous
Replies: 2
Views: 24

liquid vs aqueous

what is the difference between a liquid and an aqueous solution?
by 905084274
Tue Jan 08, 2019 6:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: aqueous solutions
Replies: 2
Views: 23

aqueous solutions

If a chemical equation has aqueous solutions in it that means that it can dissolve in water. So if you were to write an equation, how do you know whether or not to include water?
by 905084274
Mon Jan 07, 2019 6:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition hw problem 11.31
Replies: 2
Views: 39

6th edition hw problem 11.31

for part c, how do you know if there is a tendency to form more reactants or more products...how does the Q value being less than K value affect his?
by 905084274
Mon Jan 07, 2019 6:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition hw problem 11.7
Replies: 3
Views: 45

Re: 6th edition hw problem 11.7

Thank you! How do you find the % decomposition? it says (6/11) x 100% but where does 6 come from?
by 905084274
Mon Jan 07, 2019 5:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th edition hw problem 11.7
Replies: 3
Views: 45

6th edition hw problem 11.7

I don't understand how you can identify which flask represents the point in time at which the reaction has reached equilibrium? Can someone please explain this. I tried counting out the number of X2 molecules as well as the dissociation of diatomic molecules... The answer is flask #3 but I don't kno...

Go to advanced search