## Search found 20 matches

Fri Dec 08, 2017 11:56 pm
Forum: Naming
Topic: Oxidation Numbers and how to get them
Replies: 4
Views: 424

### Re: Oxidation Numbers and how to get them

You can find the oxidation numbers by identifying the charged ligands first and determining what charge that leaves the compound at. And then see what the given total charge of the compound should be and calculate the oxidation number based on that (whether the compound is neutral or 2-, etc.).
Fri Dec 08, 2017 11:53 pm
Forum: Lewis Acids & Bases
Topic: Strength [ENDORSED]
Replies: 5
Views: 685

### Strength[ENDORSED]

What are the best ways to determine strengths of acids and bases when given the molecular formula?
Wed Nov 29, 2017 9:24 pm
Forum: Ideal Gases
Topic: Pascal vs Atmosphere
Replies: 3
Views: 454

### Re: Pascal vs Atmosphere

I would just follow whichever unit is given in the question, though from lecture it seems that atm are more prevalent than Pa.
Wed Nov 29, 2017 9:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Monodentate vs Bidentate etc. [ENDORSED]
Replies: 7
Views: 3024

### Re: Monodentate vs Bidentate etc.[ENDORSED]

I am also wondering about this. In my Peer Review Session, the UA mentioned something about the number of bonds that the central atom can make being the indicator?
Fri Nov 24, 2017 12:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure or Concentration
Replies: 3
Views: 228

### Re: Partial Pressure or Concentration

I think partial pressure is for when the reactants or products are in the gas phase and concentration is used when they are in an aqueous phase.
Fri Nov 24, 2017 12:30 pm
Forum: Ideal Gases
Topic: Reverse Reaction, Q and K
Replies: 5
Views: 638

### Re: Reverse Reaction, Q and K

If Q is equal to K, then the reaction is at equilibrium. At equilibrium the reaction is moving in both directions and at equal rates so there is no net change in the direction of the reaction.
Thu Nov 16, 2017 7:55 pm
Forum: Hybridization
Topic: Hybrid Orbitals 4.31
Replies: 2
Views: 251

### Re: Hybrid Orbitals 4.31

The number of hybrid orbitals is equivalent to the number of electron density regions when looking at VSEPR structures. For example, sp3 would have 4 equivalent orbitals, and with 4 regions of electron density, the most stable shape would be tetrahedral. Similarly, with sp3d2, the most stable shape ...
Thu Nov 16, 2017 7:46 pm
Forum: Hybridization
Topic: 2 regions of electron density
Replies: 4
Views: 368

### Re: 2 regions of electron density

We do not count double bonds as two regions of electron density because a double bond only means that the two atoms are closer in distance and more strongly bonded. It does not mean that the an atom is bonded twice or to separate electron regions.
Thu Nov 09, 2017 1:04 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Replies: 3
Views: 6625

The negative sign in Bohr's equation is there because E=0 when the electron and neutron are separated completely (when the electron is free). So, as they get closer (or get lower in orbitals), they are losing energy and therefore the energy calculated when doing Bohr's equation is negative.
Thu Nov 09, 2017 1:03 am
Forum: Limiting Reactant Calculations
Topic: Two-step reactions [ENDORSED]
Replies: 2
Views: 317

### Two-step reactions[ENDORSED]

How do you figure out how to find the theoretical yield of one of the products when there are two chemical equations given for the two-step reaction?
Wed Nov 01, 2017 6:23 pm
Forum: Electronegativity
Topic: Finding Electronegativity
Replies: 4
Views: 356

### Finding Electronegativity

Is there a way to calculate electronegativity or is it a given value from the periodic table?
Wed Nov 01, 2017 6:17 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 4
Views: 341

### Re: Octet Exceptions

Yes, the elements P, S, Cl, and any element that is energy level 3 or higher and has access to the d-orbital will not adhere to the octet rule, and thus will be able to hold additional electrons when needed in making Lewis Structures.
Wed Oct 25, 2017 1:49 am
Forum: Quantum Numbers and The H-Atom
Topic: Abbreviating e- configurations [ENDORSED]
Replies: 7
Views: 635

### Re: Abbreviating e- configurations[ENDORSED]

That is a shorthand way of writing the configuration. I believe it depends on what the question is asking for, but in general it is much easier to write the configuration with the noble gas shorthand.
Wed Oct 25, 2017 1:45 am
Forum: Quantum Numbers and The H-Atom
Topic: 4s before 3d
Replies: 3
Views: 2622

### 4s before 3d

Why exactly do electrons fill up the 4s orbital before filling up the 3d? And why when writing out the configuration must we write 3d before 4s?
Fri Oct 20, 2017 2:12 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 23
Views: 1907

### Re: De Broglie Wavelength

When dealing with the De Broglie wavelength, usually the question will include a velocity or a mass of the particle being used (or say that it's an electron or something else with a known mass). This equation deals with particles that are not moving at the speed of light, so if the particle discusse...
Fri Oct 20, 2017 2:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Angular Quantum Numbers
Replies: 1
Views: 204

### Angular Quantum Numbers

Is there any other way one could determine the angular quantum number of an element to describe the shape of the wave function other than looking at its location on the periodic table?
Thu Oct 12, 2017 6:17 pm
Forum: Properties of Light
Topic: Prefix Conversion
Replies: 12
Views: 771

### Re: Prefix Conversion

It is the easiest to convert first so you don't forget throughout the problem to convert. At the end you can convert back to the units that the question asks for but throughout the problem if there are different units, using meters, seconds, or kilograms is a basic standard unit to use.
Thu Oct 12, 2017 4:37 pm
Forum: Properties of Light
Topic: Planck Constant [ENDORSED]
Replies: 8
Views: 701

### Re: Planck Constant[ENDORSED]

Sig figs are mostly used in the final answer rather than throughout all of the steps in the equations. Though, it's a good idea to keep 3 or 4 digits after the decimal just so there's greater accuracy in the final answer when rounded.
Thu Oct 05, 2017 4:39 pm
Forum: Balancing Chemical Reactions
Topic: Order of steps
Replies: 6
Views: 687

### Re: Order of steps

Personally, it seems easiest to choose the most "complex" compound from the reactants and begin balancing the corresponding elements on the product side. This way, you can get rid of the more difficult compounds at the beginning, and the rest will be easier to balance.
Thu Oct 05, 2017 4:35 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units Usage
Replies: 3
Views: 380

### Formula Units Usage

When the textbook asks for amounts of compound in units of formula units, what units are they expecting the answer to be in? Also, when would formula units be used over other units of measurement in real life applications?