Search found 12 matches

by Daniel Dobrin 2F
Sun Mar 19, 2017 1:39 am
Forum: General Rate Laws
Topic: Units for Rate Constants
Replies: 1
Views: 326

Units for Rate Constants

Hey everyone,

I had a quick question. What are the units for the rate constant k for 0, 1st, and 2nd order reactions? I know each one is different, but I can't remember what they are.

Thank you and good luck tomorrow!!!
by Daniel Dobrin 2F
Sun Mar 12, 2017 10:24 pm
Forum: *Alcohols
Topic: Functional Groups Naming (Priority?)
Replies: 1
Views: 337

Functional Groups Naming (Priority?)

Hey everyone,

I had a quick question. When naming, do we give number priority to the functional groups? What happens if there are two or more functional groups? Which of those get priority? Also, if there is a double/triple bond and a functional group, which of those gets priority?

Thank you!
by Daniel Dobrin 2F
Mon Mar 06, 2017 10:22 pm
Forum: *Alkanes
Topic: drawing line structures
Replies: 2
Views: 339

Re: drawing line structures

You can draw them in multiple ways and it doesn't matter how you start. Even if you start it horizontally or vertically, it's correct.
by Daniel Dobrin 2F
Sun Feb 26, 2017 2:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429095

Re: Post All Chemistry Jokes Here

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" - and he died.
by Daniel Dobrin 2F
Sat Feb 18, 2017 11:59 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics Quiz
Replies: 1
Views: 385

Kinetics Quiz

Hi! I was wondering how much of kinetics is going to be on the quiz next week? In the course reader, we didn't get passed page 73 (stopped before temperature), so will it appear on the quiz? Will the quiz only be problems similar to those in the homework that is before the temperature section or sho...
by Daniel Dobrin 2F
Sat Feb 11, 2017 9:14 pm
Forum: Balancing Redox Reactions
Topic: Balancing 14.5 part d
Replies: 1
Views: 411

Balancing 14.5 part d

Hey everyone, I'm having trouble with chapter 14 question 5 part d. We have to balance the equation using half-reactions. The reaction occurs in a basic solution. We are given: P4(s) -> H2PO2-(aq) + PH3(g) In the solutions manual, PH3 is gone when doing it. I really don't understand how to the whole...
by Daniel Dobrin 2F
Wed Feb 08, 2017 6:08 pm
Forum: General Rate Laws
Topic: When to use which rate law?
Replies: 1
Views: 265

When to use which rate law?

Hi :)

I was just wondering how to know when to use either the differential rate law and when to use the integrated rate law? Why would you choose one over the other?

Thank you!
by Daniel Dobrin 2F
Fri Feb 03, 2017 1:46 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free Energy and Electrochemistry
Replies: 2
Views: 433

Gibbs Free Energy and Electrochemistry

What is the relation between Gibbs free energy and electrochem? I don't understand why we can calculate G in this section.
by Daniel Dobrin 2F
Wed Jan 25, 2017 10:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Chapter 9 #7
Replies: 1
Views: 295

Re: Entropy Chapter 9 #7

You would use basically the same formula for both parts of the question. For constant pressure, use: Delta S = n*Cp*ln(T2/T1), where Cp signifies a constant pressure. For constant volume, use: Delta S = n*Cv*ln(T2/T1), where Cv signifies a constant volume. Since it tells us we're dealing with ideal ...
by Daniel Dobrin 2F
Sun Jan 22, 2017 7:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Textbook Problem 8.21
Replies: 2
Views: 382

Re: Textbook Problem 8.21

What you do is you set nC(Tf-Ti)=-nC(Tf-Ti). Now just be consistent with the grams and heat capacity copper and water by making sure they're on the same side of the equation. I personally did copper on the left side and water on the right (negative) side.
by Daniel Dobrin 2F
Fri Jan 20, 2017 1:36 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: -q(Rxn)=q(cal)? [ENDORSED]
Replies: 3
Views: 517

Re: -q(Rxn)=q(cal)? [ENDORSED]

In an isolated system, there is no transfer of heat or matter, so when you add up any and all the heat transfers, you need to get 0. So one is positive and one is negative in order to cancel out. So, you add the negative part to both sides. For example, 24 - 24 = 0. So add 24 to both sides and you g...
by Daniel Dobrin 2F
Tue Jan 10, 2017 8:24 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Severe Burns Question
Replies: 3
Views: 395

Steam Severe Burns Question

I understand that you have to add the ~41kJ and ~5kJ, but I'm not totally sure the actual process behind it. Is it because the steam has to change into water first? And if so, why does it have to turn into water to burn us?

Thanks :)

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