## Search found 30 matches

Sun Jun 10, 2018 5:39 pm
Forum: Octet Exceptions
Topic: expanded octet
Replies: 12
Views: 448

### 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: 214

### 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: 496

### 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: 188

### 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: 423

### 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: 281

### 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: 108

### 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: 166

### 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: 411

### 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
Thu May 17, 2018 11:06 am
Forum: Molarity, Solutions, Dilutions
Topic: Units - L or mL? [ENDORSED]
Replies: 15
Views: 551

### 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: 180

### 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: 207

### 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: 360

### 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: 207

### 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: 163

### 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: 163

### 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: 329

### 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: 366

### 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: 365

### 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: 346

### 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: 447

### 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: 551

### 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: 330

### 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: 540

### 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: 208

### 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: 172

### Re: Using Precision and Accuracy to Solve A Problem

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: 907

### 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: 701

### 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: 219

### 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: 911

### Re: Moles mols mol?[ENDORSED]

I think that it doesn't matter too much which one you use. I think I typically see mol.