Search found 27 matches

by Palmquist_Sierra_2N
Sat Mar 18, 2017 3:33 pm
Forum: First Order Reactions
Topic: Q 5A 2014 FINAL
Replies: 1
Views: 270

Q 5A 2014 FINAL

Question 5A on the winter 2014 final in the back of our course reader solves for the rate constant at the end but doesn't show how. I understand how to find which order the reaction is and the rate law but not how to find the rate constant with the given information. Please help/explain. Thanks!
by Palmquist_Sierra_2N
Sat Mar 18, 2017 12:11 pm
Forum: *Organic Reaction Mechanisms in General
Topic: 4.40 (m)
Replies: 1
Views: 474

4.40 (m)

Im having trouble with this problem on understanding part m) which reactions could be described as kinetically controlled? Could you help explain this, thank you!
by Palmquist_Sierra_2N
Fri Mar 17, 2017 9:53 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Quiz 2 question
Replies: 3
Views: 344

Quiz 2 question

On my quiz there was the problem asking what is the pseudo-equilibrium constant? It was number 4 on the Wednesday quiz. Does anyone know how we were suppose to solve/calculate for it? Thanks
by Palmquist_Sierra_2N
Tue Mar 14, 2017 7:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011739

Re: Post All Chemistry Jokes Here

Whats the sluttiest element?
Carbon because it bonds with basically everything
by Palmquist_Sierra_2N
Tue Mar 14, 2017 6:58 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Equatorial and axial bonds
Replies: 4
Views: 845

Re: Equatorial and axial bonds

when drawing cis and trans on a molecule like that does it matter if you draw off the axial or the equatorial?
by Palmquist_Sierra_2N
Wed Mar 08, 2017 8:20 pm
Forum: *Alkanes
Topic: Iso, Neo, and Tert
Replies: 3
Views: 381

Re: Iso, Neo, and Tert

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by Palmquist_Sierra_2N
Mon Feb 20, 2017 3:00 pm
Forum: First Order Reactions
Topic: 15.29
Replies: 3
Views: 816

15.29

For the first order reaction A-->3B+C, when initial concentration of A = 0.015 mol/L, the concentration of B increases to 0.018 mol/L in 3.0 minutes. a) what is the rate constant for the reaction expressed as the rate of loss of A? b) how much more time would be needed for the concentration of B to ...
by Palmquist_Sierra_2N
Sat Feb 18, 2017 4:00 pm
Forum: General Rate Laws
Topic: 15.9 [ENDORSED]
Replies: 4
Views: 475

15.9 [ENDORSED]

Express the units for rate constants when the concentrations are in miles per liter and time is in seconds for a) zero-order reactions; b) first-order reactions; c) second- order reactions

Please help explain
by Palmquist_Sierra_2N
Sat Feb 11, 2017 9:05 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.43
Replies: 1
Views: 211

9.43

Suppose that 50 g of H2O(l) at 20 degrees C is mixed with 65 g of H2O(l) at 50 degrees C at a constant pressure in a thermally insulated vessel. Calculate delta S and delta S total for the process.
Please help explain the set up and solving of this problem. Thanks!
by Palmquist_Sierra_2N
Thu Feb 02, 2017 9:42 pm
Forum: Balancing Redox Reactions
Topic: 14.1
Replies: 1
Views: 201

14.1

H+(aq) + Cr2o7(2-)(aq) + C2H5OH(aq)-->Cr(3+)(aq) + C2H4O(aq) + H2O(l)
How do you know the C is being oxidized?
by Palmquist_Sierra_2N
Thu Feb 02, 2017 9:35 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: How to keep track of significant figures?
Replies: 2
Views: 385

Re: How to keep track of significant figures?

Well based on the numbers given in the question your final answer should have two sig figs. Look at the values given, and the one with the least number of sig figs is your reference for how many sig figs your final answer should have
by Palmquist_Sierra_2N
Thu Jan 26, 2017 6:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.67
Replies: 1
Views: 297

Re: HW 8.67

Hey! First off, the product side of the reaction should only be CH3OH.
For carbon(C) you have to atomize/ sublime it. You look up C in the (g) form in the chart and see that the enthalpy of formation is 716.68 kJ/mol
by Palmquist_Sierra_2N
Sun Jan 22, 2017 2:50 pm
Forum: Phase Changes & Related Calculations
Topic: Practice Quizes
Replies: 10
Views: 778

Re: Practice Quizes

Do we know how many questions there will be on the quiz?
by Palmquist_Sierra_2N
Tue Jan 17, 2017 10:51 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.73 (Bond Enthalpies
Replies: 5
Views: 701

HW 8.73 (Bond Enthalpies

I'm kind of confused with the concept of bond enthalpies.
Estimate the reaction enthalpy for
a) 3 C2H2(g)-->C6H6(g)
b) CH4(g)+4 Cl2(g)-->CCL4(g)+4 HCL(g)
by Palmquist_Sierra_2N
Thu Dec 01, 2016 5:12 pm
Forum: Lewis Acids & Bases
Topic: HW 12.17
Replies: 4
Views: 553

Re: HW 12.17

This question is asking to determine whether the oxides are acidic, basic, or amphoteric. How exactly do you determine/ figure that out?
a)BaO
b)SO3
c)As2O3
d)Bi2O3
by Palmquist_Sierra_2N
Thu Dec 01, 2016 4:58 pm
Forum: Lewis Acids & Bases
Topic: 12.13
Replies: 1
Views: 303

12.13

The question asks you to draw the Lewis structure for each species and identify if it's a lewis acid or base.
For part c) How do you know that Ag+ is a lewis acid?
by Palmquist_Sierra_2N
Mon Nov 21, 2016 2:49 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: When to use the approximation [ENDORSED]
Replies: 2
Views: 272

Re: When to use the approximation [ENDORSED]

Whenever x is smaller than 10^-3.
You also know the approximation is okay if x is less than 5% of the initial and you find this by using the formula for % ionization of the acid.
by Palmquist_Sierra_2N
Mon Nov 21, 2016 11:51 am
Forum: Conjugate Acids & Bases
Topic: Chapter 12 Question 1
Replies: 3
Views: 450

Re: Chapter 12 Question 1

For part c) would it just become HCO3, or it would it have a plus sign? Since it starts with a -
by Palmquist_Sierra_2N
Wed Nov 16, 2016 9:02 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Question regarding heteronuclear molecular orbitals
Replies: 2
Views: 329

Re: Question regarding heteronuclear molecular orbitals

You can just draw a lewis structure if you wanted. But this is usually referring to drawing out the molecular orbitals and filling in the valence electrons in each level of sigma and pi bonds. For heteronuclear ones just know that the more electronegative component is written lower.
by Palmquist_Sierra_2N
Sat Nov 12, 2016 3:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Prep 2014 #6
Replies: 1
Views: 209

Quiz 3 Prep 2014 #6

What conditions favor SO2(g) production?
2SO3(g) <--> 2SO2(g) +O2(g) H= +198 KJ
Need help understanding, thanks.
by Palmquist_Sierra_2N
Fri Nov 04, 2016 3:23 pm
Forum: Ionic & Covalent Bonds
Topic: Cation vs Anion
Replies: 4
Views: 697

Cation vs Anion

Can someone just explain what is a cation vs an anion and what is the importance of knowing the cations and anions?
by Palmquist_Sierra_2N
Fri Oct 28, 2016 3:07 pm
Forum: Hybridization
Topic: 4.31
Replies: 1
Views: 144

4.31

State the relative orientations of the following hybrid orbitals:
a) sp^3
b)sp
c) sp^3d^2
d) sp^2

What is the question asking and how do I go about it?
by Palmquist_Sierra_2N
Wed Oct 19, 2016 10:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Problem 2.81
Replies: 1
Views: 190

Problem 2.81

Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this anomaly.
by Palmquist_Sierra_2N
Wed Oct 12, 2016 10:24 pm
Forum: Trends in The Periodic Table
Topic: Chapter 2, Homework Problem 2.45
Replies: 3
Views: 652

Chapter 2, Homework Problem 2.45

Struggling with the concept of electron configuration. How to do this question with an explanation of how you did it. Thanks.

Which elements are predicted to have the following ground-state electron configurations: a) [Kr] 4d^10 5s^2 5p^4; b) [Ar] 3d^3 4s^2; c) [He]2s^2 2p^2; d) [Rn]7s^2 6d^2
by Palmquist_Sierra_2N
Fri Oct 07, 2016 9:40 am
Forum: Properties of Light
Topic: Formulas need to know? [ENDORSED]
Replies: 3
Views: 409

Formulas need to know? [ENDORSED]

I've been told different things so I was wondering what formulas will not be given to us for the quiz? Which formulas and constants do we need to know?
by Palmquist_Sierra_2N
Wed Sep 28, 2016 5:33 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamental F. 3 Part B
Replies: 1
Views: 277

Re: Fundamental F. 3 Part B

Well mass percentage is calculated by the mass of the component over the total mass of the mixture. So if you just think about Nitric Acid you know there is 3 times the number of oxygens to one nitric acid. The higher the mass of the component then the higher its mass percentage will be, so oxygen i...
by Palmquist_Sierra_2N
Wed Sep 28, 2016 5:26 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals G13
Replies: 6
Views: 1091

Fundamentals G13

I'm really struggling with understanding molarity problems. Could someone explain how do G.13. To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20 M NH4NO3 (aq) by adding 3.0 L of water. The florist then adds 100 mL of the dilutes solution to each plant. How many moles of nitrogen atom...

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