Search found 15 matches
- Tue Feb 10, 2015 10:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Re: **Important Midterm Information Winter 2015**
- Replies: 6
- Views: 12686
Re: **Important Midterm Information Winter 2015**
This question is in regards to Professor Lavell's Review session problems: During Professor Lavell's review session, problem number two (the camping at the sea problem) when the combustion reaction of butane was written the water was a gas. A problem similar to this in the text book, 7.105, wrote th...
- Tue Feb 10, 2015 5:49 pm
- Forum: General Science Questions
- Topic: Combustion Reactions
- Replies: 3
- Views: 10128
Re: Combustion Reactions
During Professor Lavell's review session number two (the camping at the sea problem) when the combustion reaction of butane was written the water was a gas. A problem similar to this in the text book, 7.105, wrote the reaction of C6H6(L) with carbon dioxide gas and water liquid as the products. Do w...
- Mon Jan 19, 2015 12:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW #7.47 part B
- Replies: 2
- Views: 552
Re: HW #7.47 part B
Hi, In the question it states that the enthalpy of combustion of gasoline can be approximated by that of octane. Since we are trying to find the yearly energy we need a value of energy when we are computing the yearly energy. In problem 7.45 it states that the enthalpy of combustion for octane is -5...
- Sat Jan 17, 2015 3:21 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Reaction Enthalpies - #7.53
- Replies: 3
- Views: 714
Re: Reaction Enthalpies - #7.53
Hi, So the goal in this problem is to find the final temperature, So you need to find "q". Because the reaction take place at constant pressure, we know that "q=deltaH" You use standard formation enthalpies given in the back of the book, and the equation that finds deltaH (standa...
- Sat Jan 17, 2015 3:15 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy Density and TNT
- Replies: 2
- Views: 809
Re: Enthalpy Density and TNT
Hi,
Are you asking about the 1/4 of TNT used in the conversion to enthalpy density (energy released per liter) for the reaction? If so, it is because there are for moles of TNT. You divide the value you got for enthalpy of the reaction by the for moles of TNT.
Hope this helps.
Are you asking about the 1/4 of TNT used in the conversion to enthalpy density (energy released per liter) for the reaction? If so, it is because there are for moles of TNT. You divide the value you got for enthalpy of the reaction by the for moles of TNT.
Hope this helps.
- Thu Dec 11, 2014 12:56 am
- Forum: Ionic & Covalent Bonds
- Topic: FINAL EXAM 2013 Q3C
- Replies: 3
- Views: 902
Re: FINAL EXAM 2013 Q3C
My best suggestion is to look at how far away the elements are from each other in the periodic table, therefore looking at the electronegativity difference. Fluorine is furthest from Ag, and you also know that Fluorine is very electronegative.
- Tue Dec 02, 2014 8:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Attachment of anions in the Lewis structure
- Replies: 2
- Views: 537
Re: Attachment of anions in the Lewis structure
You would write the anion outside of the compound within its own brackets, like in an ionic Lewis structure. If you look through chem community, I asked how to draw a specific structure, and a fellow student made an amazing video, you should check it out.
- Mon Dec 01, 2014 4:23 pm
- Forum: Bronsted Acids & Bases
- Topic: J11 Question
- Replies: 1
- Views: 567
Re: J11 Question
Hi, I don't have an exact answer to your question. However, in the back of the book the answer to the first equation does not include Na. We are asked to look at the reaction of the cation or anion that is a weak acid or base. So because C6H5O^- is a weak acid and Na actually forms a strong base (Na...
- Sat Nov 29, 2014 4:04 pm
- Forum: Naming
- Topic: Chloro vs Chlorido
- Replies: 2
- Views: 5332
Re: Chloro vs Chlorido
Hi chloro and chloride is essentially the same thing. Chlorido is the newer IUPAC name Convention and Chloro is the older one. Dr. Lavell said you can use either one, both are acceptable.
- Sat Nov 29, 2014 4:01 pm
- Forum: Naming
- Topic: ch 16 #29 part b
- Replies: 1
- Views: 463
Re: ch 16 #29 part b
Hi, So in this problem you have to look at the oxidation states (oxidation numbers). Sulfate has a -2 charge and you know Cobalt has a +3 charge if you add those oxidation states you have +1 as the total charge of the compound. Chlorine, the anion, has a -1 charge, thus the charges of both the catio...
- Sat Nov 22, 2014 12:24 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook HW problem #47b
- Replies: 1
- Views: 473
Re: Textbook HW problem #47b
Hi, In the problem when you look for the % of PCl5 decomposed you have your initial amount of .019M and at equilibrium its concentration is .009. So to find the amount decomposed you do .019M-.009M= .0100M. You then find the % by decomposed amount/original amount x 100% and your answer should come o...
- Wed Nov 19, 2014 9:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: HW Ch 10 #47
- Replies: 1
- Views: 491
Re: HW Ch 10 #47
I cannot answer your question, but I would like to point out that if you look at the solutions manual, the value in the quadratic formula doesn't have 1.05 in front of it (the value that would get 2.1). However if you use just 2 you come to the same answer for the equilibrium mixtures.
- Tue Nov 18, 2014 11:22 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Video: Drawing Coordination Compounds
- Replies: 8
- Views: 1790
Video: Drawing Coordination Compounds
How would we draw the following compound:
[Cr(H2O)4Cl2]Cl2.H2O
[Cr(H2O)4Cl2]Cl2.H2O
- Sun Nov 09, 2014 1:46 am
- Forum: Lewis Structures
- Topic: Midterm Prep - Fall 2012 question 5 B. in course reader
- Replies: 1
- Views: 397
Re: Midterm Prep - Fall 2012 question 5 B. in course reader
Hi,
In the Lewis Structure that has a lower formal charge, carbon doesn't have a complete octet. Carbon needs to have a complete octet, therefore you use the second Lewis Structure with a triple bond.
In the Lewis Structure that has a lower formal charge, carbon doesn't have a complete octet. Carbon needs to have a complete octet, therefore you use the second Lewis Structure with a triple bond.
- Fri Oct 03, 2014 8:55 pm
- Forum: DeBroglie Equation
- Topic: wavelike properties
- Replies: 1
- Views: 444
wavelike properties
When using the DeBroglie equation and the wavelength found cannot be measured/detected, or wavelike properties cannot be observed, does this mean the object doesn't have wavelike properties?
Thank you
Thank you