Search found 40 matches

by yazminedesan1F
Wed Jun 13, 2018 10:34 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 5
Views: 320

Re: Oxidation Number

How do you find the oxidation number of a metal?
by yazminedesan1F
Sun May 27, 2018 9:14 pm
Forum: Lewis Structures
Topic: Central atom and octet rule?
Replies: 12
Views: 634

Re: Central atom and octet rule?

it depends on the element usually
by yazminedesan1F
Sun May 27, 2018 9:11 pm
Forum: Octet Exceptions
Topic: expanded octets
Replies: 5
Views: 283

Re: expanded octets

usually i add bonds from each element to the central element and try and give them each an octet with what remaining electrons i have
by yazminedesan1F
Sun May 27, 2018 9:08 pm
Forum: Bond Lengths & Energies
Topic: Test 3 bond length question
Replies: 8
Views: 389

Re: Test 3 bond length question

the bond that is shortest is stronger and the bonds that are longer are weakest. It goes, in order of increasing bond strength and in order of decreasing bond length: single bond<double bond<triple bond
by yazminedesan1F
Sun May 20, 2018 4:01 pm
Forum: Lewis Structures
Topic: Different ways to write the lewis structure?
Replies: 6
Views: 264

Different ways to write the lewis structure?

I was wondering if it was okay if the way we draw our Lewis structure was different from the solutions manual, in that it has the same number of valence electrons and each element is correctly bonded, but the structuring and order is different? This example is CH3OH.
by yazminedesan1F
Sun May 20, 2018 2:46 pm
Forum: Lewis Structures
Topic: Chemical Formula Name
Replies: 3
Views: 142

Re: Chemical Formula Name

I think for the test he would give us the chemical formula since we have not gone over how to write the chemical formula from just the name.
by yazminedesan1F
Sun May 20, 2018 2:44 pm
Forum: Lewis Structures
Topic: 3.39
Replies: 5
Views: 216

Re: 3.39

I was also wondering if we needed to know how to convert the wording of chemical formulas into the actual chemical formula, especially for the upcoming test, but we haven't learned about it yet. My TA gave the names for us, however, if this is helpful to you: a) ammonium chloride, NH4Cl^+ b) potassi...
by yazminedesan1F
Sun May 13, 2018 8:48 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 458

Re: Bonds or Lone Pairs more important?

This really depends on the molecule and you'd have to access where a single or double bond should be fit
by yazminedesan1F
Sun May 13, 2018 8:47 pm
Forum: Lewis Structures
Topic: Valence shell on Noble gases
Replies: 4
Views: 177

Re: Valence shell on Noble gases

They are at their fullest and are content that way so no
by yazminedesan1F
Sun May 13, 2018 8:45 pm
Forum: Lewis Structures
Topic: Cations and Anions
Replies: 3
Views: 143

Re: Cations and Anions

yes usually lewis structures will have a charge outside of the brackets
by yazminedesan1F
Sun May 06, 2018 8:21 pm
Forum: Ionic & Covalent Bonds
Topic: Atomic and Ionic Radius
Replies: 2
Views: 136

Re: Atomic and Ionic Radius

The ionic radius is the the distance from the nucleus to the outermost electrons in a ion, while the atomic radius is the distance from the nucleus to the normal valence electrons. The ionic radius in a positive ion is less than the distance from the nucleus to the valence electrons and the ionic ra...
by yazminedesan1F
Sun May 06, 2018 8:13 pm
Forum: Empirical & Molecular Formulas
Topic: Order of Elements [ENDORSED]
Replies: 3
Views: 261

Re: Order of Elements [ENDORSED]

Generally, in the order their given I would put them in that order, for example if given the percentage of C,H, then O, I would write it as CHO. It probably doesn't matter but to be safe I would keep them in order :-)
by yazminedesan1F
Sun May 06, 2018 8:11 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 1983

Re: Midterm Topics [ENDORSED]

Megan Potter 1G wrote:How far in the periodic table do we need to know for electron configuration stuff? To krypton (so 3d, 4s, 4p)?

Im assuming its only up to the d orbital, not the f orbital.
by yazminedesan1F
Sun May 06, 2018 8:09 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: midterm practice q.8
Replies: 1
Views: 138

midterm practice q.8

A bullet of mass 2.8 g travels at 373.23 ± .34 m/s. What is the indeterminacy of position?
could someone explain this question and how to do it? thanks!
by yazminedesan1F
Sun May 06, 2018 7:20 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 1983

Re: Midterm Topics [ENDORSED]

Nienjou Claire 1E wrote:Also, does anyone know where we can get practice midterms? Does the test bank have any?

These arent lavelles exams but it is good practice from Scerri! http://www.bruintestbank.com/chemistry/
by yazminedesan1F
Sun May 06, 2018 6:04 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 1983

Re: Midterm Topics [ENDORSED]

DomMaiorca_1I wrote:Will we need to be able to draw electron configurations for the midterm?

Yes I believe we should know how to draw them or at least write them seeing as we've done so in class
by yazminedesan1F
Sun May 06, 2018 5:54 pm
Forum: Properties of Light
Topic: 4b practice midterm
Replies: 11
Views: 659

4b practice midterm

" A newly designed laser pointer with a certain frequency is pointed at a sodium metal surface. An electron is ejected from the metal surface with wavelength 1.10 nm. What is the frequency of the light from the laser pointer? The work function of sodium is 150.6 kJ∙mol-1" So sometimes to f...
by yazminedesan1F
Sun Apr 29, 2018 4:46 pm
Forum: DeBroglie Equation
Topic: Test #2: Q5 [ENDORSED]
Replies: 9
Views: 529

Re: Test #2: Q5 [ENDORSED]

How were you able to see the quiz earlier than discussion?
by yazminedesan1F
Sun Apr 29, 2018 4:45 pm
Forum: Properties of Electrons
Topic: electron mass
Replies: 15
Views: 598

Re: electron mass

the test should definitely give you the mass of an electron, proton, and photon i believe
by yazminedesan1F
Sun Apr 29, 2018 4:40 pm
Forum: Properties of Electrons
Topic: Information Provided on Exam
Replies: 6
Views: 307

Re: Information Provided on Exam

its usually not provided, you should probably just know a ballpark around what each wavelength represents
by yazminedesan1F
Sun Apr 29, 2018 4:36 pm
Forum: Quantum Numbers and The H-Atom
Topic: What do l and m represent? [ENDORSED]
Replies: 6
Views: 237

Re: What do l and m represent? [ENDORSED]

l represents the type of orbital and m represents which of the l orbitals you're in
by yazminedesan1F
Sun Apr 29, 2018 4:33 pm
Forum: Properties of Electrons
Topic: Mass of an Electron [ENDORSED]
Replies: 4
Views: 239

Re: Mass of an Electron [ENDORSED]

on the equations sheet we see that the mass of an electron is 9.1095 x 10^-31 kg
by yazminedesan1F
Sun Apr 29, 2018 4:28 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 132
Views: 75862

Re: Reading the textbook [ENDORSED]

Jocelyn1B wrote:How do you balance your other classes while still studying for chemistry?

typically I set a certain amount of time each week just for chemistry, at least three times a week while also studying for a test the week before so I don't get overwhelmed
by yazminedesan1F
Sat Apr 28, 2018 4:26 pm
Forum: Photoelectric Effect
Topic: What is work function? [ENDORSED]
Replies: 15
Views: 1782

Re: What is work function? [ENDORSED]

Its just the energy required to remove an electron
by yazminedesan1F
Tue Apr 24, 2018 10:59 am
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 441

Re: Test 2 Material

Should we understand the ranges of wavelengths of light? like the specific ranges of wavelength (visible light, UV,etc...) because I know some module questions asked that and I don't know the range off the top of my head. thanks!
by yazminedesan1F
Sun Apr 22, 2018 5:50 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding atomic weight (general question) [ENDORSED]
Replies: 8
Views: 397

Re: Rounding atomic weight (general question) [ENDORSED]

I would just use the periodic table atomic masses. I usually round when finding amount in moles to have a whole number
by yazminedesan1F
Sun Apr 22, 2018 5:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units - L or mL? [ENDORSED]
Replies: 15
Views: 627

Re: Units - L or mL? [ENDORSED]

I would change it to liters to keep it all consistent
by yazminedesan1F
Sun Apr 22, 2018 5:48 pm
Forum: Significant Figures
Topic: Use of sigfigs
Replies: 8
Views: 374

Re: Use of sigfigs

I would just in case it states otherwise
by yazminedesan1F
Sun Apr 22, 2018 5:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg [ENDORSED]
Replies: 5
Views: 265

Re: Rydberg [ENDORSED]

would use for wavelength but can also be manipulated for other uses
by yazminedesan1F
Sun Apr 22, 2018 5:35 pm
Forum: Einstein Equation
Topic: Planck's Constant Value [ENDORSED]
Replies: 7
Views: 2789

Re: Planck's Constant Value [ENDORSED]

I would use whats given or whatever has more decimals just to be more accurate
by yazminedesan1F
Sun Apr 22, 2018 5:32 pm
Forum: Properties of Electrons
Topic: electron mass
Replies: 15
Views: 598

Re: electron mass

yes it's important to consider it
by yazminedesan1F
Sun Apr 22, 2018 5:29 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 132
Views: 75862

Re: Reading the textbook [ENDORSED]

what's the best way to learn the material for someone who's not so familiar with chemistry concepts?
by yazminedesan1F
Sun Apr 22, 2018 5:27 pm
Forum: Properties of Light
Topic: still don't uderrsatnd what a photon is [ENDORSED]
Replies: 20
Views: 430

Re: still don't uderrsatnd what a photon is [ENDORSED]

its basically a particle representing a quantum of light or other electromagnetic radiation. It carries energy proportional to the radiation frequency but with zero mass
by yazminedesan1F
Sun Apr 15, 2018 8:05 pm
Forum: Significant Figures
Topic: Rounding: when and where?
Replies: 10
Views: 479

Re: Rounding: when and where?

usually I round to however many numbers are in the question.
by yazminedesan1F
Sun Apr 15, 2018 8:02 pm
Forum: SI Units, Unit Conversions
Topic: Length Units
Replies: 15
Views: 543

Re: Length Units

typically yes you should use SI units
by yazminedesan1F
Sun Apr 15, 2018 8:01 pm
Forum: SI Units, Unit Conversions
Topic: writing out conversions in one long line vs. steps
Replies: 16
Views: 643

Re: writing out conversions in one long line vs. steps

If you do it the longer way, you're able to see the units and therefore can easily figure out what units you'll want in the end.
by yazminedesan1F
Sun Apr 15, 2018 8:00 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 458

Re: Reagent vs. Reactant [ENDORSED]

a reactant is the starting material that will eventually undergo changes in a chemical rxtn while a reagent is the compound added to a system in order to cause a chemical rxtn. sometimes you can use them interchangeably.
by yazminedesan1F
Sun Apr 15, 2018 7:51 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Which mass of oxygen should be used? [ENDORSED]
Replies: 23
Views: 998

Re: Which mass of oxygen should be used? [ENDORSED]

I typically use 16 just to get an even number of moles if thats what im trying to find
by yazminedesan1F
Mon Apr 09, 2018 9:00 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework Question E9a
Replies: 2
Views: 223

Re: Homework Question E9a

Mg: 24.305 (atomic mass) x 1(amount of element) S: 32.06 x 1 = 32.06 O: 16 x 4 = 64 for the 7H20 you bring 7 and multiply it by 2 for hydrogen to get 14 hydrogen and 7 multiplied by one oxygen is 7 oxygen H: 1.008 x 14 = 14.112 O: 16 x 7=112 add all of these and you should get 246.477 which, because...
by yazminedesan1F
Mon Apr 09, 2018 8:39 pm
Forum: Molarity, Solutions, Dilutions
Topic: question on fundamentals G
Replies: 5
Views: 388

question on fundamentals G

Hey! I'm not very sure how to go about this question G.5: A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfe...

Go to advanced search