Search found 31 matches
- Sun Dec 09, 2018 9:17 am
- Forum: Conjugate Acids & Bases
- Topic: Stability of Conjugate Base
- Replies: 6
- Views: 3786
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.
- Sun Dec 09, 2018 9:15 am
- Forum: Calculating the pH of Salt Solutions
- Topic: pH of acids
- Replies: 13
- Views: 3595
Re: pH of acids
The lower the pH the stronger the acid!
- 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: 541
Re: 6th Edition Example 12.10 -12.11
It is part of the HW so it will be covered on the test!
- Mon Dec 03, 2018 1:35 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 11
- Views: 957
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.
- Mon Dec 03, 2018 1:32 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E
- Replies: 18
- Views: 3288
Re: AX3E
The electron arrangement is tetrahedral but the molecular shape is trigonal pyramidal
- Mon Dec 03, 2018 1:21 am
- Forum: Sigma & Pi Bonds
- Topic: Number of Sigma and Pi Bonds
- Replies: 6
- Views: 999
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.
- Mon Dec 03, 2018 1:19 am
- Forum: Sigma & Pi Bonds
- Topic: Triple bond?
- Replies: 18
- Views: 1756
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
A double bond has 1 sigma bond and 1 pi bond
A single bond is made up of only one sigma bond
- Mon Dec 03, 2018 12:47 am
- Forum: Lewis Acids & Bases
- Topic: HI or HCl: stronger acid
- Replies: 8
- Views: 10627
Re: HI or HCl: stronger acid
HI would be the stronger acid due to its larger atomic radius.
- Mon Dec 03, 2018 12:45 am
- Forum: Lewis Acids & Bases
- Topic: Weak Acid/Base vs. Strong
- Replies: 7
- Views: 899
Re: Weak Acid/Base vs. Strong
Just like others have said, it is much easier to memorize the strong acids and bases to differentiate
- Mon Dec 03, 2018 12:44 am
- Forum: Lewis Acids & Bases
- Topic: acid names
- Replies: 8
- Views: 754
Re: acid names
I would look at the most common acids. Mostly strong acids. Also would look at the acids used in practice problems.
- Sun Nov 25, 2018 9:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Naming
- Replies: 5
- Views: 502
Re: Naming
Yes, the electron arrangement and the molecular shape are going to be the same.
- Sun Nov 25, 2018 8:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-Shaped
- Replies: 5
- Views: 882
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.
- Sun Nov 25, 2018 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw
- Replies: 2
- Views: 284
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...
- Sun Nov 11, 2018 5:22 pm
- Forum: Lewis Structures
- Topic: Octet rule question
- Replies: 6
- Views: 798
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.
- Sun Nov 11, 2018 5:18 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 14
- Views: 1314
Re: Formal Charge
Generally, although there are exceptions, the central atom should have a formal charge of zero for it to be most stable.
- Sun Nov 11, 2018 5:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: Strength of Bonds?
- Replies: 5
- Views: 680
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.
- Sat Nov 03, 2018 9:51 pm
- Forum: Lewis Structures
- Topic: Radicals?
- Replies: 4
- Views: 364
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!
Radicals and Biradicals are part of 2C so it may be covered!
- Sat Nov 03, 2018 9:48 pm
- Forum: Lewis Structures
- Topic: Textbook 7th edition problem 11 part C
- Replies: 1
- Views: 177
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?
- Sat Nov 03, 2018 9:46 pm
- Forum: Octet Exceptions
- Topic: The center atom
- Replies: 20
- Views: 3311
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.
- Sun Oct 28, 2018 9:20 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 7
- Views: 711
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!
- Sun Oct 28, 2018 9:16 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity Trend
- Replies: 9
- Views: 1130
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.
- Sun Oct 28, 2018 9:12 pm
- Forum: Trends in The Periodic Table
- Topic: Electron configuration exceptions
- Replies: 3
- Views: 476
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?
- Thu Oct 18, 2018 3:56 am
- Forum: Photoelectric Effect
- Topic: 1B.25
- Replies: 2
- Views: 347
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?
- Thu Oct 18, 2018 3:49 am
- Forum: Quantum Numbers and The H-Atom
- Topic: 7th Edition HW 1D.21
- Replies: 3
- Views: 369
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
b)1s: 1
c)6f: 7
d)2p: 3
- Thu Oct 18, 2018 3:34 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Problem 1D 13
- Replies: 2
- Views: 286
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.
- Fri Oct 12, 2018 2:16 am
- Forum: Limiting Reactant Calculations
- Topic: Photoelectric Effect [ENDORSED]
- Replies: 2
- Views: 506
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.
- Fri Oct 12, 2018 2:10 am
- Forum: SI Units, Unit Conversions
- Topic: mol vs. mmol
- Replies: 12
- Views: 2844
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
- Fri Oct 12, 2018 2:02 am
- Forum: Empirical & Molecular Formulas
- Topic: M19 Finding O
- Replies: 1
- Views: 322
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.
- Thu Oct 04, 2018 11:28 pm
- Forum: Empirical & Molecular Formulas
- Topic: F.13
- Replies: 6
- Views: 4343
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 ...
- Wed Oct 03, 2018 9:18 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: fundamentals e15
- Replies: 4
- Views: 533
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
- Wed Oct 03, 2018 9:00 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: E.25 part a
- Replies: 2
- Views: 239
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?