## Search found 14 matches

Sat Dec 03, 2016 9:07 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: When to disregard -x in equilibrium formula?
Replies: 2
Views: 547

### Re: When to disregard -x in equilibrium formula?

I think it's after you assume to disregard it and proceed to find out what "x" is. You then calculate it as a percentage of the initial M value. If it's less than 5% of the initial molarity then it's okay to disregard it. If not, use quadratic.
Fri Nov 25, 2016 5:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8894
Views: 1529828

### Re: Post All Chemistry Jokes Here

Why did the acid go to the gym?
To become a buffer solution.
Mon Nov 14, 2016 4:12 pm
Forum: Naming
Topic: Quiz 3 Prep2 #5
Replies: 1
Views: 341

### Quiz 3 Prep2 #5

You are studying the following reaction at high temperatures, N2+H2==> NH3
In one of your experiments at 500 K you find at equilibrium:
NH3 Partial pressure= .887
H2= .168
N2= .0561
Determine the equilibrium constant for this reaction at 500K.
Sun Nov 13, 2016 6:45 pm
Forum: Naming
Topic: Quick way to determine oxidation number?
Replies: 1
Views: 1747

### Quick way to determine oxidation number?

What's everyone's fastest way of determining the oxidation number?
Thu Nov 10, 2016 1:37 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing MO diagrams
Replies: 2
Views: 491

### Re: Drawing MO diagrams

Only the valence electrons need to be drawn
Thu Nov 03, 2016 11:57 am
Forum: Hybridization
Topic: Bond Character of Fluorine
Replies: 1
Views: 552

### Re: Bond Character of Fluorine

The second answer is right (2sp3), because you still use hybridization to form the sp hybrid orbital. The s orbital and two of the p orbitals are already full with Flourine's valence electrons, while the one electron left in the third p orbital has room for one more electron (the one bond that Flour...
Fri Oct 28, 2016 1:25 am
Forum: Dipole Moments
Topic: Dipole Moment in a Lewis Structure
Replies: 5
Views: 1595

### Re: Dipole Moment in a Lewis Structure

How do we know which is negative and which is positive?
Fri Oct 28, 2016 1:23 am
Forum: Bond Lengths & Energies
Topic: Arranging Ions According to Bond Length
Replies: 1
Views: 492

### Re: Arranging Ions According to Bond Length

I find drawing the structure to be the best and easiest way.
Wed Oct 26, 2016 12:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question on Wedge diagram
Replies: 2
Views: 401

### Re: Question on Wedge diagram

No, but we can choose that version if we want to
Wed Oct 19, 2016 10:39 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: General Question [ENDORSED]
Replies: 2
Views: 480

### Re: General Question[ENDORSED]

It's the net positive charge of valence electrons, basically how much pull protons have on the outermost electrons. Decreases with increase of levels.
(I think)
Tue Oct 11, 2016 4:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.29 from the textbook [ENDORSED]
Replies: 2
Views: 503

### Re: Question 2.29 from the textbook[ENDORSED]

No electrons in the same shell can have the exact same set of quantum numbers. So the quantum numbers that have a maximum number of 2 electrons (b and d) can only have two because they are limited in their capacity to differentiate between the given quantum numbers; in other words, they have less ro...
Wed Oct 05, 2016 1:15 pm
Forum: DeBroglie Equation
Topic: Post Module Question [ENDORSED]
Replies: 3
Views: 573

### Re: Post Module Question[ENDORSED]

The speed of the electron can not be faster than the speed of light, therefore if it the speed is a higher number than the speed of light the speed calculated would be unreasonable.
Fri Sep 30, 2016 9:14 am
Forum: Empirical & Molecular Formulas
Topic: Rounding
Replies: 1
Views: 789

### Re: Rounding

When I did this problem, the number of moles I calculated for oxygen (after dividing each element's number of moles by the smallest number) was 2.99. I think you were just maybe not being exact enough in your calculations; try to write out more than 2 decimal points of the molar mass. Hope that helps!
Sun Sep 25, 2016 11:44 am
Forum: Limiting Reactant Calculations
Topic: Mass Always Equal?
Replies: 3
Views: 604

### Mass Always Equal?

If the mass of a chemical reaction never changes from the initial reactants to the final product, in what aspect does the limiting reactant affect the reaction?