Search found 18 matches
- Sun Dec 10, 2017 10:21 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Strengths of Acids
- Replies: 2
- Views: 603
Re: Strengths of Acids
acid strength can be determined by looking at how stable its conjugate base is. If the conjugate base has more EN atoms, then it creates delocalization of electrons and makes it more stable
- Sun Dec 10, 2017 10:20 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Assumption for Subtracting X in Ka or Kb calculation [ENDORSED]
- Replies: 3
- Views: 834
Re: Assumption for Subtracting X in Ka or Kb calculation [ENDORSED]
the x value is so small compared to the concentration that the change is negligible for when you're calculating x
- Sun Dec 03, 2017 5:23 pm
- Forum: Ideal Gases
- Topic: Kp and Kc
- Replies: 7
- Views: 1181
Re: Kp and Kc
Kc uses molar concentrations while Kp uses the partial pressures of gasses inside the closed system
- Sun Dec 03, 2017 5:19 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Difference betwen constant and quotient?
- Replies: 4
- Views: 773
Re: Difference betwen constant and quotient?
They are calculated the same way, but the quotient represents the reaction at any time while the constant is only when the reaction is at equilibrium
- Sun Nov 26, 2017 11:05 pm
- Forum: Hybridization
- Topic: Pi Bonds vs. Sigma Bonds
- Replies: 7
- Views: 1100
Re: Pi Bonds vs. Sigma Bonds
Sigma bonds are the FIRST bonds to be made between two atoms. They are made from hybridized orbitals. Pi bonds are the SECOND and THIRD bonds to be made. They are made from leftover "p" orbitals
- Sun Nov 26, 2017 11:00 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Diatomic Molecules
- Replies: 2
- Views: 533
Re: Diatomic Molecules
Heteronuclear diatomic molecules are composed of two atoms of different elements, like in the case of hydrochloric acid and carbon monoxide.
- Sun Nov 19, 2017 7:20 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Order
- Replies: 6
- Views: 1149
Re: Bond Order
To determine bond order, draw the lewis structure, count the total number of bonds, and divide by the atoms.
- Sun Nov 19, 2017 7:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent or linear?
- Replies: 11
- Views: 2032
Re: Bent or linear?
If there are no lone pairs then it would be linear because it is lacking the electron repulsion from the lone pairs.
- Sun Nov 12, 2017 10:36 pm
- Forum: Lewis Structures
- Topic: Lewis acids and bases [ENDORSED]
- Replies: 3
- Views: 551
Re: Lewis acids and bases [ENDORSED]
A lewis acid accepts electrons while a lewis base donates electrons
- Sun Nov 12, 2017 10:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonding: Polar and Non-polar
- Replies: 6
- Views: 1075
Re: Covalent Bonding: Polar and Non-polar
You can tell when comparing the differences in electronegativities of each atom. Generally, if the difference is greater than 2 it is said to be a polar bond.
- Sun Nov 05, 2017 2:08 am
- Forum: Lewis Structures
- Topic: electron configuration
- Replies: 6
- Views: 790
Re: electron configuration
I read in the textbook that generally for elements with an atomic number of 20 or above, they begin listing the electron configuration in simple numerical order instead of having configurations where 4s comes before 3d
- Sun Nov 05, 2017 2:00 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hund's Rule [ENDORSED]
- Replies: 6
- Views: 1217
Re: Hund's Rule [ENDORSED]
For an electron to be spin paired means that one electron within the orbital has a counterclockwise spin, while the other electron occupying that orbital has a clockwise spin.
- Sun Oct 29, 2017 11:33 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius vs. Ionic Radius [ENDORSED]
- Replies: 4
- Views: 881
Re: Atomic Radius vs. Ionic Radius [ENDORSED]
Atomic radius is half the distance between two neighboring atoms, and the ionic radius is half the distance between an ionic bond of neighboring atoms.
- Sun Oct 29, 2017 11:29 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Removing an Electron [ENDORSED]
- Replies: 5
- Views: 832
Re: Removing an Electron [ENDORSED]
It is always the electron in the outer valence shell. As n goes up, energy goes up and the electron eventually escapes from the atom.
- Sun Oct 15, 2017 7:06 pm
- Forum: Properties of Electrons
- Topic: Threshold level and Work Function [ENDORSED]
- Replies: 6
- Views: 1083
Re: Threshold level and Work Function [ENDORSED]
Yes, the threshold is the same as the work function. Essentially it is just the amount of energy needed to eject an electron from a piece of metal.
- Sun Oct 15, 2017 7:04 pm
- Forum: Properties of Light
- Topic: Photoelectric Experiments:Light [ENDORSED]
- Replies: 4
- Views: 643
Re: Photoelectric Experiments:Light [ENDORSED]
They generally use ultraviolet light due to its high energy (high frequency). This gives the individual photons enough energy to eject an individual electron. It follows this 1:1 ratio.
- Sun Oct 08, 2017 10:36 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 36707
Re: All students read this sig fig post [ENDORSED]
Do you know if the problems will specifically tell us how many significant figures to use? No. With the numbers that are given, you should know how many sig figs to use. But when using molecular mass, the best number is 3-4 sig figs. When in doubt, use 3 sig figs. Other than that, always apply the ...
- Sun Oct 08, 2017 10:18 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical equations too slow... any advice? [ENDORSED]
- Replies: 18
- Views: 4092
Re: Balancing Chemical equations too slow... any advice? [ENDORSED]
I usually start with the element that occurs the least. After balancing that, I go in ascending order until I finish.