Search found 24 matches
- Thu Nov 29, 2018 10:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 3
- Views: 451
Re: Lone pairs
Its because in the other atoms, there are protons that act as a sort of buffer tht lessens the effects of the charges, but there are no protons in a lone pair.
- Thu Nov 29, 2018 10:43 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charges
- Replies: 4
- Views: 528
Re: Charges
You just have to memorize the charges for most common ligands. then take the charge of the ligands and subtract the total chrge of the ligands to find the charge of the central atom.
- Thu Nov 29, 2018 10:35 pm
- Forum: Hybridization
- Topic: CH2O hybridization
- Replies: 9
- Views: 15411
Re: CH2O hybridization
Count the number of lone pairs and add them to number of sigma bonds to find that number. then add on an orbital for each number
- Thu Nov 29, 2018 10:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 6th edition 4.23
- Replies: 3
- Views: 720
Re: 6th edition 4.23
There is a double bond for both the oxygen atoms in B, but only one has a double bond in letter C because an O atom with a single bond and 3 lone pairs has a formal charge of -1 and the overall molecule has a negetive 1 charge.
- Thu Nov 29, 2018 10:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole moment
- Replies: 7
- Views: 729
Re: Dipole moment
As a general idea, the further the two elements are on the periodic table, the greater the difference in electronegetivity and therefore the greater the difference in the dipole moment.
- Thu Nov 15, 2018 11:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle of Sulfite Ion
- Replies: 2
- Views: 362
Re: Bond Angle of Sulfite Ion
When there is a lone pair of electrons, they have a greater repulsion against the two atoms, so the two Oxygen atoms will be closer together because the lone pair is pushing them closer.
- Thu Nov 15, 2018 3:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR forms
- Replies: 3
- Views: 286
Re: VSEPR forms
When there are are no lone pairs, the VSEPR model allows for each atoms electrons to be exactly as far away from each other as possible. When lone pairs are present, they repel the atoms more than another atom, so it has the effect of shrinking the angles between the atoms.
- Thu Nov 15, 2018 2:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: number of different molecular shapes
- Replies: 3
- Views: 404
Re: number of different molecular shapes
So far in lecture, we've cover linear, Trigonal planer, tetrahedral, Trigonal Bipyramidal, Octahedral, and trigonal Pyramidal. One key to remember is that although lone pairs of electrons change the shape, you do not look at them when naming the shape created.
- Thu Nov 08, 2018 2:09 pm
- Forum: Resonance Structures
- Topic: Finding all Resonance Structures
- Replies: 4
- Views: 517
Re: Finding all Resonance Structures
I would say the only "trick" is seeing if there are different places where the same bond could possibly be placed without the formal charge being changed at all, but this really isn't a trick.
- Thu Nov 08, 2018 2:03 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chemical Bonds
- Replies: 5
- Views: 566
Re: Chemical Bonds
Covenant bonds would be the longer of these two bonds because the shorter the bond length, the stronger the bond. Therefore because ionic bonds are stronger, they are shorter.
- Thu Nov 08, 2018 1:57 pm
- Forum: Octet Exceptions
- Topic: Octet
- Replies: 6
- Views: 835
Re: Octet
I wouldn't think of the Octet rule as a rule but as more of a suggestion because it doesn't apply to the subshells after 3s
- Thu Nov 01, 2018 11:28 pm
- Forum: Ionic & Covalent Bonds
- Topic: octet rule
- Replies: 11
- Views: 1126
Re: octet rule
Its honestly just a "rule" because the most abundant atoms on earth generally follow the octet rule. (N, C, O)
- Thu Nov 01, 2018 11:25 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 8
- Views: 764
Re: Formal Charge
To find "s" write the Lewis dot structure and then count the number of bonds that they form. however, don't forget to divide it by two in the equation.
- Thu Nov 01, 2018 11:16 pm
- Forum: Resonance Structures
- Topic: 6th Edition 3.21
- Replies: 2
- Views: 313
6th Edition 3.21
For the Calcium+2 ion, would you have to write out the entire ground state configuration, or would you just be able to write [Ar].
- Thu Nov 01, 2018 11:16 pm
- Forum: Resonance Structures
- Topic: 6th Edition 3.21
- Replies: 2
- Views: 300
6th Edition 3.21
For the Calcium+2 ion, would you have to write out the entire ground state configuration, or would you just be able to write [Ar].
- Thu Oct 25, 2018 11:31 pm
- Forum: DeBroglie Equation
- Topic: Units of De Broglie's Equation
- Replies: 4
- Views: 3492
Re: Units of De Broglie's Equation
Thanks Guys
- Thu Oct 25, 2018 10:20 pm
- Forum: DeBroglie Equation
- Topic: Units of De Broglie's Equation
- Replies: 4
- Views: 3492
Units of De Broglie's Equation
I understand that the SI unit for wavelength is meters, but when doing the calculation, how do you cancel the other units to get meters.
- Thu Oct 25, 2018 10:17 pm
- Forum: DeBroglie Equation
- Topic: De Broglie
- Replies: 12
- Views: 1476
Re: De Broglie
Yeah,
if it gives you the speed of a subatomic particle, you can then use that to find the momentum by using the sheet of constants to find the mass of the particle. You generally use it when they ask for the wavelengthand give you speed or momentum.
if it gives you the speed of a subatomic particle, you can then use that to find the momentum by using the sheet of constants to find the mass of the particle. You generally use it when they ask for the wavelengthand give you speed or momentum.
- Thu Oct 18, 2018 11:08 pm
- Forum: DeBroglie Equation
- Topic: De Broglie
- Replies: 12
- Views: 1476
Re: De Broglie
On the homework problems, it some times gives you the velocity of a subatomic particle and you have to use the unit sheet (or google) in order to find the momentum (p) so that you can then move forward use De Broglie's equation.
- Thu Oct 18, 2018 3:24 pm
- Forum: DeBroglie Equation
- Topic: De Broglie
- Replies: 2
- Views: 377
Re: De Broglie
For that problem, do not use De Broglie's equation. Just use the equation Ep=hc/lamda because you are given the wavelength and not the momentum. Using this will the right answer and correct units.
- Thu Oct 18, 2018 12:56 pm
- Forum: Properties of Light
- Topic: problem 1.25
- Replies: 2
- Views: 344
Re: problem 1.25
Given that they give you the wavelength the Ep=hc/(wavelength) equation works here. Using this equation gives you the answer that's in the back of the book. Why they say to use the equation with a frequency, I don't know but just stick with using the wavelength. Also, don't forget to change the nano...
- Thu Oct 04, 2018 9:06 pm
- Forum: Significant Figures
- Topic: Limiting Reactants
- Replies: 6
- Views: 632
Re: Limiting Reactants
If you were to do the whole problem as many time as the amount of reactants, each assuming a different reactant to be the limiting reactant, the answer that produces the least product is the limiting reactant.
- Thu Oct 04, 2018 8:54 pm
- Forum: Limiting Reactant Calculations
- Topic: Mole-to-mole predictions [ENDORSED]
- Replies: 2
- Views: 1043
Re: Mole-to-mole predictions [ENDORSED]
Yeah, and if it isn't perfect to the formula you use the ratio that is found in the formula and then adjust it up or down depending on the limiting reactant. Ex. You have a limiting reactant of 3 moles of A and the formula is 2A+B -- C+D you multiply 2 by 1.5 to get the 3 mole s and then multiply th...
- Thu Oct 04, 2018 8:19 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: QUESTION G15
- Replies: 1
- Views: 188
QUESTION G15
For G15, how can you get the volume of a diluted solution if you are never given the initial volume or final volume?