Search found 31 matches

by Sang Hyoun Hong 3G
Sun Dec 09, 2018 9:17 am
Forum: Conjugate Acids & Bases
Topic: Stability of Conjugate Base
Replies: 6
Views: 360

Re: Stability of Conjugate Base

The more stable, the more likely an acid will donate its proton. If the conjugate base is more stable, the stronger the acid.
by Sang Hyoun Hong 3G
Sun Dec 09, 2018 9:15 am
Forum: Calculating the pH of Salt Solutions
Topic: pH of acids
Replies: 8
Views: 275

Re: pH of acids

The lower the pH the stronger the acid!
by Sang Hyoun Hong 3G
Sun Dec 09, 2018 9:13 am
Forum: Calculating the pH of Salt Solutions
Topic: 6th Edition Example 12.10 -12.11
Replies: 2
Views: 207

Re: 6th Edition Example 12.10 -12.11

It is part of the HW so it will be covered on the test!
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 1:35 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 11
Views: 173

Re: Lone Pairs

Lone pairs push existing bonds and thus distort the original shape of the atom. The repulsion between lone pair electrons and shared electrons is what causes the electron arrangement and molecular shape of a molecule to differ.
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 1:32 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 299

Re: AX3E

The electron arrangement is tetrahedral but the molecular shape is trigonal pyramidal
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 1:21 am
Forum: Sigma & Pi Bonds
Topic: Number of Sigma and Pi Bonds
Replies: 6
Views: 319

Re: Number of Sigma and Pi Bonds

You can have more than 1 pi bond because they are made up of the interaction between p orbitals. Because some elements can have the Px Py and Pz orbitals, they can make 3 pi bonds while only one S orbital is available, thus making it so that there can only be one sigma bond.
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 1:19 am
Forum: Sigma & Pi Bonds
Topic: Triple bond?
Replies: 11
Views: 402

Re: Triple bond?

A triple bond has 1 sigma bond and 2 pi bonds.
A double bond has 1 sigma bond and 1 pi bond
A single bond is made up of only one sigma bond
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 12:47 am
Forum: Lewis Acids & Bases
Topic: HI or HCl: stronger acid
Replies: 8
Views: 514

Re: HI or HCl: stronger acid

HI would be the stronger acid due to its larger atomic radius.
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 12:45 am
Forum: Lewis Acids & Bases
Topic: Weak Acid/Base vs. Strong
Replies: 7
Views: 155

Re: Weak Acid/Base vs. Strong

Just like others have said, it is much easier to memorize the strong acids and bases to differentiate
by Sang Hyoun Hong 3G
Mon Dec 03, 2018 12:44 am
Forum: Lewis Acids & Bases
Topic: acid names
Replies: 8
Views: 125

Re: acid names

I would look at the most common acids. Mostly strong acids. Also would look at the acids used in practice problems.
by Sang Hyoun Hong 3G
Sun Nov 25, 2018 9:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming
Replies: 5
Views: 81

Re: Naming

Yes, the electron arrangement and the molecular shape are going to be the same.
by Sang Hyoun Hong 3G
Sun Nov 25, 2018 8:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-Shaped
Replies: 5
Views: 114

Re: T-Shaped

The t-shaped molecule is made up of 3 atoms. One goes straight up, one goes straight down, and one is perpendicular to the two. So the bond angles between the perpendicular atom and the other two atoms are 90 degrees. The bond angle between the atom going straight down and straight up is 180 degrees.
by Sang Hyoun Hong 3G
Sun Nov 25, 2018 8:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 2
Views: 58

Re: Seesaw

If the lone pair is in the equatorial position, it would be repelled by 2 atoms that are located 90 degrees away from it. If the lone pair is in the axial position, it would be repelled by 3 atoms that are located 90 degrees away from it. The lone pair is located where it is repelled/attracted by fe...
by Sang Hyoun Hong 3G
Sun Nov 11, 2018 5:22 pm
Forum: Lewis Structures
Topic: Octet rule question
Replies: 6
Views: 161

Re: Octet rule question

Every element before period 3 should follow the octet rule. Elements in period 3 have access to the d orbital so can have an expanded octet.
by Sang Hyoun Hong 3G
Sun Nov 11, 2018 5:18 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 14
Views: 267

Re: Formal Charge

Generally, although there are exceptions, the central atom should have a formal charge of zero for it to be most stable.
by Sang Hyoun Hong 3G
Sun Nov 11, 2018 5:16 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of Bonds?
Replies: 5
Views: 161

Re: Strength of Bonds?

All bonds have ionic character. The strength of the bond is determined by the electronegativies of the atoms in the bond.
by Sang Hyoun Hong 3G
Sat Nov 03, 2018 9:51 pm
Forum: Lewis Structures
Topic: Radicals?
Replies: 4
Views: 60

Re: Radicals?

The website says: "Midterm covers: Fundamentals, Quantum, Bonding to end of 3.11 (6 Ed.) and to end of 2C (7 Ed.)"
Radicals and Biradicals are part of 2C so it may be covered!
by Sang Hyoun Hong 3G
Sat Nov 03, 2018 9:48 pm
Forum: Lewis Structures
Topic: Textbook 7th edition problem 11 part C
Replies: 1
Views: 36

Textbook 7th edition problem 11 part C

How do you start to draw the lewis structure of H2C(NH2)COOH? Would you just add up the electrons and see what works?
by Sang Hyoun Hong 3G
Sat Nov 03, 2018 9:46 pm
Forum: Octet Exceptions
Topic: The center atom
Replies: 20
Views: 602

Re: The center atom

The textbook says to "choose as the central atom the element with the lowest ionization energy." In the case of the problem, the Oxygen has the lowest ionization energy so it is the central atom.
by Sang Hyoun Hong 3G
Sun Oct 28, 2018 9:20 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 7
Views: 148

Re: Atomic Radius

There are fewer electrons that experience a greater force of attraction from the positive nucleus. Thus it is harder to take electrons away!
by Sang Hyoun Hong 3G
Sun Oct 28, 2018 9:16 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 9
Views: 196

Re: Electron Affinity Trend

The elements on the top right of the periodic table tend to be more electronegative because the nucleus exerts a stronger pull on the outer electrons and thus form octet configurations more easily.
by Sang Hyoun Hong 3G
Sun Oct 28, 2018 9:12 pm
Forum: Trends in The Periodic Table
Topic: Electron configuration exceptions
Replies: 3
Views: 86

Electron configuration exceptions

Can someone explain the exceptions for electron configuration? Why is it that some elements have half filled orbitals and skip to the next?
by Sang Hyoun Hong 3G
Thu Oct 18, 2018 3:56 am
Forum: Photoelectric Effect
Topic: 1B.25
Replies: 2
Views: 78

1B.25

The question asks, What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to diameter of the actual atom. How do you solve this?
by Sang Hyoun Hong 3G
Thu Oct 18, 2018 3:49 am
Forum: Quantum Numbers and The H-Atom
Topic: 7th Edition HW 1D.21
Replies: 3
Views: 96

Re: 7th Edition HW 1D.21

the number of orbitals in a subshell for a given value l is 2l+1. So when n=5 and l=2, it is in the 5th energy level with 5 orbitals. Do the same for the others:
b)1s: 1
c)6f: 7
d)2p: 3
by Sang Hyoun Hong 3G
Thu Oct 18, 2018 3:34 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 1D 13
Replies: 2
Views: 61

Re: Problem 1D 13

Question 1D 13 part d is asking for the number of subshells when n=4, or in the 4th energy level. In the 4th energy level, there are 4 subshells (4s, 4p, 4d, and 4f) and these subshells.
by Sang Hyoun Hong 3G
Fri Oct 12, 2018 2:16 am
Forum: Limiting Reactant Calculations
Topic: Photoelectric Effect [ENDORSED]
Replies: 2
Views: 216

Re: Photoelectric Effect [ENDORSED]

An electron has a negative charge. In the experiment diagram in class, the electron would reach the detector because of a positive charge attracting the electrons to it. Because of the attractive force, the electron would be detected without use of kinetic energy.
by Sang Hyoun Hong 3G
Fri Oct 12, 2018 2:10 am
Forum: SI Units, Unit Conversions
Topic: mol vs. mmol
Replies: 12
Views: 414

Re: mol vs. mmol

mmol is basically the mol with the prefix milli. In class, we went over how milli, written through the symbol m, is a factor of 10^-3. So 1 mmol= 1 mol x 10^-3
by Sang Hyoun Hong 3G
Fri Oct 12, 2018 2:02 am
Forum: Empirical & Molecular Formulas
Topic: M19 Finding O
Replies: 1
Views: 134

M19 Finding O

For M19, I'm having trouble finding the number of mols of O. Does calculating the mols of O in Co2 and H2O for the problem and adding them work? Or do you have to subtract the masses of elements N H and C from the mass given (0.376g) to find the number of mols of O.
by Sang Hyoun Hong 3G
Thu Oct 04, 2018 11:28 pm
Forum: Empirical & Molecular Formulas
Topic: F.13
Replies: 6
Views: 1522

Re: F.13

I feel like you're confusing the idea of conservation of mass with the stoichiometric coefficients of the equation. In order to solve this problem, you are allowed to subtract the 4.14 grams of Phosphorus from the product because mass is conserved. So, if you subtract 4.14 from the given 27.8 grams ...
by Sang Hyoun Hong 3G
Wed Oct 03, 2018 9:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: fundamentals e15
Replies: 4
Views: 95

Re: fundamentals e15

You found that the metal, M, is calcium. So the sulfide of the metal would be CaS. Sulfide is the sulfur ion with the metal. In order to find the molar mass of CaS, you add the molar mass of Ca with S. You should get an answer of 72.14gmol^-1
by Sang Hyoun Hong 3G
Wed Oct 03, 2018 9:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: E.25 part a
Replies: 2
Views: 61

E.25 part a

Question E.25 from fundamentals says to determine the number of KNO3 formula units in 0.750 mol KNO3. Can someone define what formula units means in this context? Is it asking for the number of molecules?

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