Search found 15 matches

by Calvin Nguyen 1H
Sat Jan 24, 2015 9:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW #63
Replies: 3
Views: 453

Re: HW #63

Actually, the enthalpy is calculated by subtracting the standard enthalpy of the products by the stand enthalpy of the reactants.
by Calvin Nguyen 1H
Fri Dec 12, 2014 10:46 am
Forum: *Titrations & Titration Calculations
Topic: pH=pKa
Replies: 2
Views: 379

Re: pH=pKa

Because at the stochiometric point the mols of the solution equals the mols of the titrant. At the halfway point to the stochiometric point, the mols of the solution is equal to to the mols of its conjugate
by Calvin Nguyen 1H
Mon Dec 08, 2014 9:45 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Determining strength of an acid without knowing the value of
Replies: 1
Views: 282

Re: Determining strength of an acid without knowing the valu

I would say bond strength are binary acids but stability for compounds
by Calvin Nguyen 1H
Mon Dec 01, 2014 7:21 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: NH2CH2CH2NH2
Replies: 3
Views: 760

Re: NH2CH2CH2NH2

only nitrogens can bind to the metal because they have lone pairs
by Calvin Nguyen 1H
Tue Nov 25, 2014 1:31 pm
Forum: Naming
Topic: 16.29 part d
Replies: 3
Views: 319

Re: 16.29 part d

Hydrogen will never bond instead of oxygen
by Calvin Nguyen 1H
Tue Nov 25, 2014 1:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework Question 69
Replies: 5
Views: 576

Re: Homework Question 69

Hey, You can tell the reaction favors the reactants not by looking at the equation but by the equilibrium constant. In this case, k is much less than 1 which means that the reactant is favored. In regards to changing the initial concentrations, we do this because it is easier to solve for the pressu...
by Calvin Nguyen 1H
Mon Nov 10, 2014 1:25 pm
Forum: Lewis Structures
Topic: Fall 2007 Midterm Q5
Replies: 3
Views: 368

Re: Fall 2007 Midterm Q5

Thanks but that's not what I asked.
by Calvin Nguyen 1H
Sun Nov 09, 2014 10:12 pm
Forum: Lewis Structures
Topic: Fall 2007 Midterm Q5
Replies: 3
Views: 368

Fall 2007 Midterm Q5

For the shape of ClBr4- I understand that it is square planar but how come Cl is the central atom instead of Br when Br has lower electronegativity?
by Calvin Nguyen 1H
Sun Nov 09, 2014 6:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: NO3^2-
Replies: 3
Views: 381

Re: NO3^2-

My TA told my discussion that the 2- was suppose to be a 1- as it was a typo
by Calvin Nguyen 1H
Tue Nov 04, 2014 11:03 pm
Forum: Lewis Structures
Topic: 2.55b) HSO3- lewis structure
Replies: 2
Views: 1860

Re: 2.55b) HSO3- lewis structure

Hello! The reason the Hydrogen atom is bonded to an oxygen atom instead of the sulfur atom is that this compound is an oxoacid. Oxoacids always have the Hydrogen on the oxygen.
by Calvin Nguyen 1H
Wed Oct 29, 2014 6:19 pm
Forum: Octet Exceptions
Topic: Lewis Structure of Hydrogen Sulfite
Replies: 2
Views: 800

Re: Lewis Structure of Hydrogen Sulfite

Because hydrogen sulfite is an oxoacid, the hydrogen bonds to the oxygen.
by Calvin Nguyen 1H
Wed Oct 29, 2014 6:13 pm
Forum: Lewis Structures
Topic: Lewis Structure for COCl2
Replies: 2
Views: 3166

Re: Lewis Structure for COCl2

Actually carbon only makes a double bond with oxygen in this molecule. Having a double bond with chlorine would give chlorine 9 valance electrons which is not stable
by Calvin Nguyen 1H
Sun Oct 19, 2014 1:39 pm
Forum: Limiting Reactant Calculations
Topic: Combustion Analysis
Replies: 3
Views: 531

Re: Combustion Analysis

Woops. I meant to say oxygen as part of the original sample not from the air.
by Calvin Nguyen 1H
Sat Oct 18, 2014 10:05 pm
Forum: Limiting Reactant Calculations
Topic: Combustion Analysis
Replies: 3
Views: 531

Combustion Analysis

Hi guys. On problem M.11, the given products are water, carbon dioxide and nitrogen gas. The answer, however, includes oxygen. Are we suppose to assume oxygen is always a reactant?
by Calvin Nguyen 1H
Sat Oct 11, 2014 10:26 pm
Forum: Molarity, Solutions, Dilutions
Topic: Solving for volume when given density?
Replies: 3
Views: 444

Re: Solving for volume when given density?

Hi Glenda! I assume you are talking about Fundamental G problem 25. The density is given because the information you are given in the problem are in grams. You use the density to convert the grams to mL using the density to solve the problem since it is asking the amount of concentrated HCL in milli...

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