Search found 30 matches

by Tiffany Tufenkjian 1E
Sun Jun 10, 2018 11:24 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 344

Re: Sig Figs for Final

I think sig figs will be graded on the final like they were on the midterm.
by Tiffany Tufenkjian 1E
Sun Jun 10, 2018 11:22 pm
Forum: General Science Questions
Topic: Final [ENDORSED]
Replies: 10
Views: 458

Re: Final [ENDORSED]

I think the final will cover material from all the outlines.
by Tiffany Tufenkjian 1E
Sun Jun 10, 2018 11:21 pm
Forum: Significant Figures
Topic: Calculations
Replies: 3
Views: 181

Re: Calculations

Sig figs usually align with the value in the problem with the least number of places.
by Tiffany Tufenkjian 1E
Sun Jun 03, 2018 8:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming Structures
Replies: 8
Views: 226

Re: Naming Structures

probably just to familiarize yourself with the names and their corresponding shapes
by Tiffany Tufenkjian 1E
Sun Jun 03, 2018 8:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis and trans
Replies: 7
Views: 192

Re: cis and trans

In a cis- molecule the dipoles will not cancel, while in a trans- molecule the dipoles will cancel.
by Tiffany Tufenkjian 1E
Sun Jun 03, 2018 8:47 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 5
Views: 177

Re: Sigma and Pi Bonds

single bond= sigma bond
double bond= sigma bond + pie bond
triple bond= sigma bond + 2 pie bonds
by Tiffany Tufenkjian 1E
Sat May 26, 2018 2:59 pm
Forum: Lewis Structures
Topic: Why Resonance for SO2?
Replies: 3
Views: 320

Re: Why Resonance for SO2?

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Resonance structures should have the same energy levels.
by Tiffany Tufenkjian 1E
Sat May 26, 2018 2:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Regions of electron density
Replies: 7
Views: 216

Re: Regions of electron density

With VSPEPR I think we only consider lone pairs on the central atom.
by Tiffany Tufenkjian 1E
Sat May 26, 2018 2:46 pm
Forum: Electronegativity
Topic: Electronegativity Caluclations
Replies: 4
Views: 242

Re: Electronegativity Caluclations

I think we will be expected to estimate the electronegativity of elements based on their location on the periodic table.
by Tiffany Tufenkjian 1E
Sun May 20, 2018 11:19 pm
Forum: Lewis Structures
Topic: Lone pair electrons
Replies: 5
Views: 159

Re: Lone pair electrons

Lines are typically used to represent bonds between atoms.
by Tiffany Tufenkjian 1E
Sat May 19, 2018 7:14 pm
Forum: Resonance Structures
Topic: How does a resonance structure work?
Replies: 10
Views: 283

Re: How does a resonance structure work?

You are able to rearrange the bonds in different equivalent locations and still have the same formal charges. The real structure will be a resonance hybrid.
by Tiffany Tufenkjian 1E
Sat May 19, 2018 7:09 pm
Forum: Ionic & Covalent Bonds
Topic: Radicals [ENDORSED]
Replies: 5
Views: 184

Re: Radicals [ENDORSED]

A radical is an atom with an unpaired electron.
by Tiffany Tufenkjian 1E
Sun May 13, 2018 10:15 pm
Forum: Ionic & Covalent Bonds
Topic: VALENCE ELECTRONS [ENDORSED]
Replies: 16
Views: 443

Re: VALENCE ELECTRONS [ENDORSED]

I count the columns of the s and p block. For example, in row 2 Li=1 valence electron, BE=2, B=3, C=4, N=5, O=6, F=7, Ne=8.
by Tiffany Tufenkjian 1E
Sun May 13, 2018 10:08 pm
Forum: Resonance Structures
Topic: resonance structures on exams
Replies: 5
Views: 192

Re: resonance structures on exams

I think the question should be clear about what it is expecting from us in the answer. Resonance structures are probably only required if asked for.
by Tiffany Tufenkjian 1E
Sun May 13, 2018 10:06 pm
Forum: Ionic & Covalent Bonds
Topic: Why can't hydrogen be a central atom? [ENDORSED]
Replies: 6
Views: 300

Re: Why can't hydrogen be a central atom? [ENDORSED]

Hydrogen only has a 1s orbital, so once it forms a bond with another atom, its single orbital is full.
by Tiffany Tufenkjian 1E
Sun May 13, 2018 10:03 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: cations vs anions
Replies: 4
Views: 178

Re: cations vs anions

The way I think about it is when a cation forms, it loses a(n) electron(s). In this case Na becomes Na+, so loses 1 electron. Now the ratio of protons to electrons is higher (there are 11 protons and 10 electrons). The protons will have a stronger pull on the electrons (the electrons will become clo...
by Tiffany Tufenkjian 1E
Sun May 06, 2018 9:39 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 22000

Re: formula units [ENDORSED]

I had this question too, I don't think it will be unclear like this on the test.
by Tiffany Tufenkjian 1E
Sun May 06, 2018 9:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations and Unpaired e- [ENDORSED]
Replies: 3
Views: 142

Re: Electron Configurations and Unpaired e- [ENDORSED]

There are 3 orbitals total that each hold two electrons (so 6 total) for p. The first 3 electrons are evenly distributed in the 3 orbitals and then the fourth is paired in the first orbital. This leaves two orbitals with unpaired electrons.
by Tiffany Tufenkjian 1E
Sun May 06, 2018 9:29 pm
Forum: Empirical & Molecular Formulas
Topic: Test 1/ Question 8 [ENDORSED]
Replies: 6
Views: 355

Re: Test 1/ Question 8 [ENDORSED]

You find the molecular formula by counting how many of each element there is and then simplify the molecular formula for the empirical formula. The mass is not needed.
by Tiffany Tufenkjian 1E
Thu May 03, 2018 10:34 am
Forum: Trends in The Periodic Table
Topic: Periodic Table Trends on the Midterm
Replies: 4
Views: 180

Re: Periodic Table Trends on the Midterm

I don't believe periodic trends will be required for the first test, but it will be important to understand them for future tests.
by Tiffany Tufenkjian 1E
Sun Apr 22, 2018 10:32 pm
Forum: Photoelectric Effect
Topic: nm vs m
Replies: 3
Views: 136

Re: nm vs m

I think the problem will be clear if it prefers a different unit over nm.
by Tiffany Tufenkjian 1E
Sun Apr 22, 2018 10:26 pm
Forum: Properties of Light
Topic: Memorizing formulas test 2
Replies: 16
Views: 538

Re: Memorizing formulas test 2

A good way to learn them is to do lots of practice problems to familiarize yourself with the different formulas. Focus more on application and less on memorization since they're provided.
by Tiffany Tufenkjian 1E
Sun Apr 22, 2018 10:21 pm
Forum: Properties of Light
Topic: Wavelengths
Replies: 8
Views: 226

Re: Wavelengths

Probably need to understand their differences relative to each other.
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 9:41 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical
Replies: 9
Views: 366

Molecular to Empirical

If we are given the molecular formula NH4OH, is it best to write the empirical formula as H5NO or would it remain the same?
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 9:21 pm
Forum: Significant Figures
Topic: Rounding: when and where?
Replies: 10
Views: 448

Re: Rounding: when and where?

I usually don't round until I get my final answer.
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 9:17 pm
Forum: SI Units, Unit Conversions
Topic: Units for Answer
Replies: 10
Views: 443

Re: Units for Answer

I usually go by the units given in the original problem unless specified otherwise. This may require converting a couple of times.
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 9:11 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]

The periodic table given to us on the test is 15.9994 g/mol. I don't usually round until I get the final answer.
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Memorizing equations [ENDORSED]
Replies: 5
Views: 237

Re: Memorizing equations [ENDORSED]

I believe the cover sheet that was on our first test will be the formulas provided to us.
by Tiffany Tufenkjian 1E
Sun Apr 15, 2018 8:59 pm
Forum: Empirical & Molecular Formulas
Topic: Similar Formulas [ENDORSED]
Replies: 3
Views: 198

Re: Similar Formulas [ENDORSED]

That's correct!

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