Search found 30 matches
- Sun Jun 10, 2018 5:39 pm
- Forum: Octet Exceptions
- Topic: expanded octet
- Replies: 12
- Views: 2732
Re: expanded octet
Elements that are in period 3 and beyond have the capacity to have an expanded octet. So if you have extra electrons, these elements would be able to hold more than 8 electrons.
- Sun Jun 10, 2018 5:34 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 5
- Views: 707
Re: Formal charge
If you are checking for formal charge and actually plugging into the equation then you should count bonds as two because you will be multiplying by 1/2 anyway, but if you are just counting them and subtracting from the number of valence electrons it has then only count the bonds as having one electr...
- Sun Jun 10, 2018 5:30 pm
- Forum: Lewis Structures
- Topic: Central atom and octet rule?
- Replies: 12
- Views: 3085
Re: Central atom and octet rule?
All atoms have to follow the octet rule unless they are able to have an expanded octet. Elements in period 3 or after are able to hold more than 8 electrons.
- Fri Jun 01, 2018 1:18 pm
- Forum: Lewis Structures
- Topic: Central Atom(s)
- Replies: 6
- Views: 778
Re: Central Atom(s)
The least electronegative atom would go in the center but Hydrogen I know for sure can never be the center atom.
- Fri Jun 01, 2018 1:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Formal charge?
- Replies: 12
- Views: 1453
Re: Formal charge?
The equation for the formal charge is, formal charge = V - (L+1/2(B)) V= # of valence electron of the element, L= # of lone pairs surrounding the atom (count each electron), B= bonded pairs (count each electron)
- Fri Jun 01, 2018 1:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Double/Triple Bonds
- Replies: 8
- Views: 1043
Re: Double/Triple Bonds
Any atom has the ability to form multiple bonds. you just have to keep in mind that not all atoms can have expanded orbitals.
- Thu May 24, 2018 11:41 am
- Forum: Lewis Structures
- Topic: 3.45 quick question
- Replies: 3
- Views: 493
Re: 3.45 quick question
N has less valence electrons than Cl and is more willing to give up its electrons than Cl.
- Thu May 24, 2018 11:04 am
- Forum: Lewis Acids & Bases
- Topic: Lewis acid vs. base
- Replies: 5
- Views: 1096
Re: Lewis acid vs. base
So basically and acid would be an electron acceptor and a base is an electron donor.
- Thu May 24, 2018 10:36 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge
- Replies: 11
- Views: 1679
Re: formal charge
so the equation for formal charge is
formal charge= v-(L+(1/2(B))
v= # of valence electrons
L= # of Lone pairs
B= # of Bonded pairs
formal charge= v-(L+(1/2(B))
v= # of valence electrons
L= # of Lone pairs
B= # of Bonded pairs
- Thu May 17, 2018 11:06 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Units - L or mL? [ENDORSED]
- Replies: 15
- Views: 4785
Re: Units - L or mL? [ENDORSED]
I believe that once you convert mL to L at the beginning of the problem, you should keep it as Liters at the end of the problem.
- Thu May 17, 2018 10:58 am
- Forum: Student Social/Study Group
- Topic: Final Study Group
- Replies: 1
- Views: 409
Final Study Group
I know it's kind of early but does anyone want to start a study group to start studying for the final?
- Thu May 17, 2018 10:20 am
- Forum: Significant Figures
- Topic: how many place numbers to round to
- Replies: 3
- Views: 533
Re: how many place numbers to round to
Thank you for the clarification, just one more additional question, how do you figure out how many sig figs you will be needing at the beginning of the problem?
- Mon May 14, 2018 7:00 pm
- Forum: Properties of Light
- Topic: Wavelength/frequency
- Replies: 11
- Views: 1319
Re: Wavelength/frequency
conceptually, I think it's because since the wavelength is longer there are fewer cycles per second so it is moving slower and has less energy.
- Mon May 14, 2018 6:50 pm
- Forum: Significant Figures
- Topic: how many place numbers to round to
- Replies: 3
- Views: 533
how many place numbers to round to
When doing a calculation and the number is really long on the calculator, how many places do we round to? and does it affect sig figs?
- Mon May 14, 2018 6:48 pm
- Forum: Significant Figures
- Topic: what part of the probem to apply sig fig rules
- Replies: 2
- Views: 443
what part of the probem to apply sig fig rules
do we have to apply the sig fig rules at each step of the problem or only at the last step?
- Fri May 04, 2018 1:30 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Knowing the Balmer series HW q1.57
- Replies: 3
- Views: 521
Re: Knowing the Balmer series HW q1.57
I also have a question pertaining to this question, in the answer manual it said n2=7. How did they solve to get that?
- Fri May 04, 2018 1:26 pm
- Forum: DeBroglie Equation
- Topic: does everything have a wavelength
- Replies: 10
- Views: 1557
Re: does everything have a wavelength
I believe that everything does have wavelike properties.
- Fri May 04, 2018 1:25 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 12
- Views: 1146
Re: Photoelectric Effect
It has to be at least the amount of energy of the threshold if not more.
- Mon Apr 30, 2018 11:02 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular to Empirical
- Replies: 9
- Views: 1193
Re: Molecular to Empirical
the empirical is the ratio rather than the actual so you would just simplify as much as possible.
- Mon Apr 30, 2018 10:58 pm
- Forum: Limiting Reactant Calculations
- Topic: actual vs. theoretical yield [ENDORSED]
- Replies: 6
- Views: 1586
Re: actual vs. theoretical yield [ENDORSED]
i believe that Theoretical is the ration of the elements and the actual is the actual amount
- Mon Apr 30, 2018 10:53 pm
- Forum: Significant Figures
- Topic: Rounding: when and where?
- Replies: 10
- Views: 896
Re: Rounding: when and where?
When: at the end of solving the problem.
- Sun Apr 22, 2018 5:45 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Units - L or mL? [ENDORSED]
- Replies: 15
- Views: 4785
Re: Units - L or mL? [ENDORSED]
If it gives you are given milliliters then you change it to liters and I believe you keep the final answer in Liters too.
- Sun Apr 22, 2018 5:42 pm
- Forum: Significant Figures
- Topic: Use of sigfigs
- Replies: 8
- Views: 949
Use of sigfigs
Do we have to keep sig figs in mind in all of the questions we solve?
- Sun Apr 22, 2018 5:40 pm
- Forum: Properties of Light
- Topic: test 2
- Replies: 18
- Views: 1657
Re: test 2
Will there be questions about new topics we learn in week 4?
- Wed Apr 11, 2018 11:52 pm
- Forum: Balancing Chemical Reactions
- Topic: Fractions in chemical equations [ENDORSED]
- Replies: 5
- Views: 1951
Re: Fractions in chemical equations [ENDORSED]
You must have whole numbers because you can not just have a part of an atom.
- Wed Apr 11, 2018 11:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Using Precision and Accuracy to Solve A Problem
- Replies: 3
- Views: 512
Re: Using Precision and Accuracy to Solve A Problem
In order to get the best answer/result having both high precision and high accuracy are important.
- Wed Apr 11, 2018 11:34 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Which mass of oxygen should be used? [ENDORSED]
- Replies: 23
- Views: 3388
Re: Which mass of oxygen should be used? [ENDORSED]
I think it is okay to use 16. I usually just use it because it is on the periodic table on the front of the textbook.
- Wed Apr 11, 2018 11:31 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2745
Re: Accuracy vs Precision
Precision is how close the measurements are to one another and accuracy is how close the measurements are to the true value.
- Wed Apr 11, 2018 11:25 pm
- Forum: SI Units, Unit Conversions
- Topic: why do I not use avogadro's number
- Replies: 5
- Views: 1952
Re: why do I not use avogadro's number
So just for clarification, Avogadro's number is only used when you're given moles?
- Wed Apr 11, 2018 11:20 pm
- Forum: SI Units, Unit Conversions
- Topic: Moles mols mol? [ENDORSED]
- Replies: 21
- Views: 9341
Re: Moles mols mol? [ENDORSED]
I think that it doesn't matter too much which one you use. I think I typically see mol.