Search found 9 matches

by Colleen_VeraCruz_3A
Sat Mar 18, 2017 2:10 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Drawing Line Structures of Cyclohexanes
Replies: 1
Views: 430

Drawing Line Structures of Cyclohexanes

When drawing line structures, how do we know if we have to draw the boat or chair conformation as opposed to drawing a "standard" symmetrical cyclohexane (like a rounded one)?
by Colleen_VeraCruz_3A
Mon Mar 06, 2017 6:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: quiz 2 #11
Replies: 1
Views: 305

quiz 2 #11

could someone please explain how to do #11 on quiz 2 pertaining to kinetics? it asks to find the rate constant at 770K when the rate constant is 25 min^-1 at 298K and 35 min^-1 at 350K. I first tried solving for the activation energy and then I plugged that value in using the same equation to solve ...
by Colleen_VeraCruz_3A
Sun Mar 05, 2017 10:15 pm
Forum: *Alkanes
Topic: Naming
Replies: 1
Views: 271

Naming

will there ever be an instance on the quiz where we will have to name a structure using both the IUPAC and common methods simultaneously? there are a few examples of this on page 9 of the ochem book.
by Colleen_VeraCruz_3A
Mon Feb 20, 2017 1:09 pm
Forum: First Order Reactions
Topic: homework 15.23 C
Replies: 1
Views: 286

homework 15.23 C

for part C, it asks to determine the rate constant for the first order reaction, given that 2A+B--->C, [A]0=0.153 mol/L and after 115 seconds the concentration of B rises to 0.034 mol/L. how do we approach this problem?
by Colleen_VeraCruz_3A
Mon Feb 13, 2017 2:33 pm
Forum: Balancing Redox Reactions
Topic: winter 2014 midterm #8
Replies: 1
Views: 232

winter 2014 midterm #8

This question asks us to calculate the value of Ka for HF given these two half equations: F2(g) + 2H+(aq) + 2e- ---> 2HF(aq) ; E=3.03V F2(g) + 2e- ---> 2F-(aq) ; E=2.87V how do we determine which of these is the cathode and which is the anode? (the solution identifies the cathode as the second half ...
by Colleen_VeraCruz_3A
Tue Feb 07, 2017 9:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: homework question 14.11
Replies: 1
Views: 218

homework question 14.11

For these types of problems, how do we determine which is the correct half reaction to "flip" in order to get the final balanced equation? For instance, in part B ( C(gr) I H2(g) I H+(aq) II Cl-(aq) I Cl2(g) I Pt(s) ), the half reaction of 2H+ + 2e- ---> H2 is reversed in the final equatio...
by Colleen_VeraCruz_3A
Sun Jan 29, 2017 11:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13715

Re: Quiz 1 Preparation Answers

Could someone please explain how you get the answer for #11(How many grams of H20 can be heated from 25 degrees to 100 degrees by the heat released from converting 49.7g of PbO to Pb)? What equation(s) are we supposed to use?
by Colleen_VeraCruz_3A
Sun Jan 22, 2017 12:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: hw 8.21
Replies: 1
Views: 191

hw 8.21

for this problem, it asks to calculate the final temperature of water when "a piece of copper of mass 20.0 g at 100 degrees C is placed in a vessel of negligible heat capacity but containing 50.7 grams of water at 22.0 degrees C." the solutions manual gives the answer 25 degrees C, but I h...
by Colleen_VeraCruz_3A
Fri Jan 13, 2017 9:20 am
Forum: Phase Changes & Related Calculations
Topic: HW 8.19
Replies: 1
Views: 196

HW 8.19

I am having trouble finding the solution to part B of 8.19 in the homework. Part A asks to calculate the heat that must be supplied to a 500.0g copper kettle containing 400.0g of water to raise it's temperature from 22.0 degrees to 100.0 degrees, which I was able to find. Part B then asks what perce...

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