Search found 27 matches
- Sat Mar 18, 2017 3:33 pm
- Forum: First Order Reactions
- Topic: Q 5A 2014 FINAL
- Replies: 1
- Views: 531
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!
- Sat Mar 18, 2017 12:11 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: 4.40 (m)
- Replies: 1
- Views: 934
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!
- Fri Mar 17, 2017 9:53 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Quiz 2 question
- Replies: 3
- Views: 726
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
- Tue Mar 14, 2017 7:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3046346
Re: Post All Chemistry Jokes Here
Whats the sluttiest element?
Carbon because it bonds with basically everything
Carbon because it bonds with basically everything
- Tue Mar 14, 2017 6:58 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: Equatorial and axial bonds
- Replies: 4
- Views: 2082
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?
- Wed Mar 08, 2017 8:20 pm
- Forum: *Alkanes
- Topic: Iso, Neo, and Tert
- Replies: 3
- Views: 996
- Mon Feb 20, 2017 3:00 pm
- Forum: First Order Reactions
- Topic: 15.29
- Replies: 3
- Views: 2508
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 ...
- Sat Feb 18, 2017 4:00 pm
- Forum: General Rate Laws
- Topic: 15.9 [ENDORSED]
- Replies: 4
- Views: 1045
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
Please help explain
- Sat Feb 11, 2017 9:05 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.43
- Replies: 1
- Views: 438
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!
Please help explain the set up and solving of this problem. Thanks!
- Thu Feb 02, 2017 9:42 pm
- Forum: Balancing Redox Reactions
- Topic: 14.1
- Replies: 1
- Views: 429
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?
How do you know the C is being oxidized?
- 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: 815
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
- 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: 570
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
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
- Sun Jan 22, 2017 2:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Practice Quizes
- Replies: 8
- Views: 1653
Re: Practice Quizes
Do we know how many questions there will be on the quiz?
- 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: 1306
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)
Estimate the reaction enthalpy for
a) 3 C2H2(g)-->C6H6(g)
b) CH4(g)+4 Cl2(g)-->CCL4(g)+4 HCL(g)
- Thu Dec 01, 2016 5:12 pm
- Forum: Lewis Acids & Bases
- Topic: HW 12.17
- Replies: 4
- Views: 978
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
a)BaO
b)SO3
c)As2O3
d)Bi2O3
- Thu Dec 01, 2016 4:58 pm
- Forum: Lewis Acids & Bases
- Topic: 12.13
- Replies: 1
- Views: 1323
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?
For part c) How do you know that Ag+ is a lewis acid?
- 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: 580
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.
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.
- Mon Nov 21, 2016 11:51 am
- Forum: Conjugate Acids & Bases
- Topic: Chapter 12 Question 1
- Replies: 3
- Views: 858
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 -
- Wed Nov 16, 2016 9:02 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Question regarding heteronuclear molecular orbitals
- Replies: 2
- Views: 648
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.
- Sat Nov 12, 2016 3:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quiz 3 Prep 2014 #6
- Replies: 1
- Views: 483
Quiz 3 Prep 2014 #6
What conditions favor SO2(g) production?
2SO3(g) <--> 2SO2(g) +O2(g) H= +198 KJ
Need help understanding, thanks.
2SO3(g) <--> 2SO2(g) +O2(g) H= +198 KJ
Need help understanding, thanks.
- Fri Nov 04, 2016 3:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: Cation vs Anion
- Replies: 4
- Views: 2745
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?
- Fri Oct 28, 2016 3:07 pm
- Forum: Hybridization
- Topic: 4.31
- Replies: 1
- Views: 368
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?
a) sp^3
b)sp
c) sp^3d^2
d) sp^2
What is the question asking and how do I go about it?
- Wed Oct 19, 2016 10:25 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Problem 2.81
- Replies: 1
- Views: 419
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.
- Wed Oct 12, 2016 10:24 pm
- Forum: Trends in The Periodic Table
- Topic: Chapter 2, Homework Problem 2.45
- Replies: 3
- Views: 1172
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
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
- Fri Oct 07, 2016 9:40 am
- Forum: Properties of Light
- Topic: Formulas need to know? [ENDORSED]
- Replies: 3
- Views: 896
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?
- Wed Sep 28, 2016 5:33 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Fundamental F. 3 Part B
- Replies: 1
- Views: 486
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...
- Wed Sep 28, 2016 5:26 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Fundamentals G13
- Replies: 6
- Views: 2748
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...