Search found 21 matches

by Maddie Hong 1I
Thu Dec 07, 2017 11:09 pm
Forum: Lewis Acids & Bases
Topic: 12.17
Replies: 2
Views: 180

Re: 12.17

Basically, metal oxides react with water to form strong bases. Many nonmetal oxides react after to form acids. Amphoteric compounds are found between the metal oxides and the nonmetal oxides of the period table along the diagonal band of the metalloids. These amphoteric compounds will include Be, Al...
by Maddie Hong 1I
Tue Dec 05, 2017 5:32 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: CH3COOH
Replies: 3
Views: 373

Re: CH3COOH

To add on, the acid will break down into H+ and CH3COO-. I don't think the other H+'s can be donated since they are part of the acetate ion, CH3COO-
by Maddie Hong 1I
Tue Dec 05, 2017 5:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape of [Co(en)2(Br)2]
Replies: 1
Views: 148

Re: Shape of [Co(en)2(Br)2]

This is because a single (en) is a bidentate, so it attaches to the central atom at two separate place.
Also the coordination number would be 6. Both (en)'s have two attachment sites and each Br has 1, so 4+2=6 for the coordination number and an octahedral shape.
by Maddie Hong 1I
Tue Nov 28, 2017 9:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K and Q [ENDORSED]
Replies: 5
Views: 286

Re: Units for K and Q [ENDORSED]

For Kc and when comparing it with Q, the values to calculate must be in mol/L since Kc is the equilibrium constant based off of concentration.
by Maddie Hong 1I
Tue Nov 28, 2017 9:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Reaction constant
Replies: 4
Views: 299

Re: Reaction constant

Generally, Kc is used for (aq) and Kp is used for gases.
by Maddie Hong 1I
Tue Nov 21, 2017 1:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Constant Calculation
Replies: 2
Views: 141

Re: Constant Calculation

The equilibrium constant of a reaction is the inverse of the equilibrium constant of its reverse reaction and vice versa. For example, aA + bB <-> cC + dD K of original reaction= ([C]^c [D]^d) / [A]^a [B]^b cC + dD <-> aA + bB K of reverse reaction= ([A]^a [B]^b) / [C]^c [D]^d This equation is equiv...
by Maddie Hong 1I
Tue Nov 21, 2017 12:42 pm
Forum: Naming
Topic: Diaqaua
Replies: 9
Views: 432

Re: Diaqaua

Also, I would note that water is sometimes written as OH2 when in the brackets, because the oxygen of the water is what connects it to the central atom.
by Maddie Hong 1I
Tue Nov 14, 2017 7:23 pm
Forum: Ionic & Covalent Bonds
Topic: different types of bonds
Replies: 6
Views: 311

Re: different types of bonds

Just to clarify, although CO2 is a nonpolar molecule, it contains polar bonds. This is because in an individual C-O bond, the dipole moment is not 0 and O is more electronegative. It is a non polar molecule, however because overall the dipole moments of both polar bonds cancel.
by Maddie Hong 1I
Tue Nov 14, 2017 7:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 109.5 degrees
Replies: 3
Views: 184

Re: 109.5 degrees

Just to add, 109.5 degrees is only for tetrahedral molecules with no lone pairs!
by Maddie Hong 1I
Wed Nov 08, 2017 10:07 am
Forum: Lewis Structures
Topic: When to use a double bond or triple bond [ENDORSED]
Replies: 6
Views: 2766

Re: When to use a double bond or triple bond [ENDORSED]

When I finish drawing my Lewis structure, I count the electrons to make sure it matches the number of electrons i should be using. If the number of electrons I used is higher and all the atoms have octets around them this generally means you should add a double or triple bond somewhere. Of course th...
by Maddie Hong 1I
Wed Nov 08, 2017 9:57 am
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 2
Views: 129

Re: Lewis Acids and Bases

A Lewis acid is an electron acceptor and a Lewis base is an electron donor. So the Lewis acid gives an electron to a Lewis base, which is why when the two bond together, they form coordinate covalent bonds.
I think Professor Lavelle said we would come back to this later in the class though.
by Maddie Hong 1I
Thu Nov 02, 2017 4:06 pm
Forum: Octet Exceptions
Topic: F orbitals
Replies: 4
Views: 258

Re: F orbitals

Yes, you don't have to worry about the f orbitals until you reach lanthanum and all the elements after lanthanum
by Maddie Hong 1I
Thu Nov 02, 2017 4:00 pm
Forum: Lewis Structures
Topic: electron configuration
Replies: 6
Views: 313

Re: electron configuration

The electron configuration is written in order of increasing n, even though that may not be the order that the shells are filled.
So the [Ar]3d^10 4s^2 4p^1 is the correct one
by Maddie Hong 1I
Wed Oct 25, 2017 9:47 pm
Forum: Trends in The Periodic Table
Topic: f-orbitals
Replies: 6
Views: 1270

Re: f-orbitals

The f-orbital starts with element 57, since the f-block is the lanthanides and actinides. For example, the electron configuration of La (lanthanum) is [Xe] 5d^1 6s^2. The electron configuration for Hf (hafnium) is [Xe] 4f^14 5d^2 6s^2

Hope this helps!
by Maddie Hong 1I
Wed Oct 25, 2017 9:13 pm
Forum: Quantum Numbers and The H-Atom
Topic: Subshell Qualities
Replies: 2
Views: 157

Re: Subshell Qualities

Effective nuclear charge refers to the "net nuclear charge after taking into account the shielding caused by other electrons in the atom," according to the textbook. So the more electrons, the smaller the effective nuclear charge. With more electrons in the atom, each individual electron f...
by Maddie Hong 1I
Fri Oct 20, 2017 2:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Spin of parallel electrons
Replies: 1
Views: 150

Re: Spin of parallel electrons

For nitrogen in its ground state, all the arrows in the p orbital should be facing up. But if there were a few more electrons like in fluorine which has 9, then you would finish filling in the subshells with down arrows so that px and py have both an up facing and down facing arrow, while pz has one...
by Maddie Hong 1I
Fri Oct 20, 2017 1:49 pm
Forum: *Shrodinger Equation
Topic: Electron Spin
Replies: 6
Views: 420

Re: Electron Spin

The spin helps distinguish which electron in a pair is spinning clockwise and which is spinning counterclockwise. Two electrons that are paired together will have the same n, l, and ml numbers but different ms/spins.
by Maddie Hong 1I
Thu Oct 12, 2017 6:30 pm
Forum: Properties of Light
Topic: Wavelengths and Frequency of Electromagnetic Radiation [ENDORSED]
Replies: 7
Views: 444

Re: Wavelengths and Frequency of Electromagnetic Radiation [ENDORSED]

I think it would be helpful to know that ultraviolet light is next to visible light on the 400 nm side and infrared light is next to visible light on the 700 nm side.
by Maddie Hong 1I
Thu Oct 12, 2017 5:54 pm
Forum: Properties of Electrons
Topic: Series
Replies: 6
Views: 421

Re: Series

My TA said we should at least know that visible light has wavelengths from about 400 nm to 700 nm.
by Maddie Hong 1I
Fri Oct 06, 2017 2:14 pm
Forum: Significant Figures
Topic: Integers and Exact Numbers- Sig Figs [ENDORSED]
Replies: 4
Views: 357

Re: Intergers and Exact Numbers- Sig Figs [ENDORSED]

Just to add on, only base your sig figs off of values/measurments the problem gives you, not on conversion factors or any other numbers you introduce into the problem yourself.
by Maddie Hong 1I
Thu Oct 05, 2017 9:22 pm
Forum: Significant Figures
Topic: 3 Sig Figs 1795.507? [ENDORSED]
Replies: 5
Views: 377

Re: 3 Sig Figs 1795.507? [ENDORSED]

If you're asking about 3 sig figs for the 1795.507, then it would be 1.80x10^3.

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