Search found 30 matches

by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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...
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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)
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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

In order to get the best answer/result having both high precision and high accuracy are important.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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.
by Maria Zamarripa 1L
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?
by Maria Zamarripa 1L
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.

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