Search found 30 matches

by Sydney Stump
Thu Dec 06, 2018 8:54 pm
Forum: Naming
Topic: Naming with bis-
Replies: 5
Views: 62

Re: Naming with bis-

Yes, it is because en includes the prefix di- already.
by Sydney Stump
Wed Dec 05, 2018 12:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 7
Views: 64

Re: Ligands

Ligands must have at least 1 lone pair why do they have to have at least one lone pair? They must have at least one lone pair so that they can form a coordinate covalent bond with the transition metal. In a coordinate covalent bond, both electrons come from the ligand so it must have a lone pair av...
by Sydney Stump
Wed Dec 05, 2018 11:48 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Determining possible intermolecular forces
Replies: 3
Views: 46

Re: Determining possible intermolecular forces

The most important factor in determining the intermolecular forces on a molecule is the polarity of the molecule. A polar molecule will be involved in forces such as dipole-dipole. A nonpolar molecule cannot be involved in dipole-dipole forces because there is no charge, therefore there is no dipole.
by Sydney Stump
Sun Dec 02, 2018 6:20 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Soapy Feels
Replies: 3
Views: 46

Re: Soapy Feels

They react with the acidic molecules in skin (fatty acids), reducing friction between fingers when they are rubbed together.
by Sydney Stump
Sun Dec 02, 2018 6:16 pm
Forum: Bronsted Acids & Bases
Topic: Strong vs Weak Acid/Base Reactions
Replies: 4
Views: 35

Re: Strong vs Weak Acid/Base Reactions

The easiest way is to just memorize the strong acids because most are weak so there are not too many. I know there is another way that involves some calculations but I think it is a lot more complex than what is expected of us for this class.
by Sydney Stump
Thu Nov 29, 2018 10:46 am
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 1
Views: 46

Bond Lengths

Hi! Will someone please explain to me why the SO bonds in SO2 and SO3 are equivalent in bond length? The question in the textbook (7th edition) is 2D.11 if you want to see it in its entirety.
by Sydney Stump
Sun Nov 25, 2018 6:45 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge vs octet rule
Replies: 4
Views: 52

Re: Formal charge vs octet rule

I believe that the formal charge takes precedence unless there is an element that cannot have the octet rule violated, so elements below period three.
by Sydney Stump
Sun Nov 25, 2018 6:42 pm
Forum: Octet Exceptions
Topic: How do we know if an element can have an expanded octet?
Replies: 3
Views: 45

Re: How do we know if an element can have an expanded octet?

The three scenarios that call for a violation of the octet rule are: an odd number of valence electrons, too few valence electrons, and too many valence electrons. The elements that can form the expanded octet have access to a third energy level, d-orbitals, which allows them to break the rule.
by Sydney Stump
Sun Nov 25, 2018 6:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 material
Replies: 6
Views: 73

Re: Test 3 material

I believe that the test covers material from sections 2D, 2E, and 2F in the seventh edition textbook.
by Sydney Stump
Sun Nov 18, 2018 8:14 pm
Forum: Lewis Acids & Bases
Topic: Bronsted Acids & Bases vs. Lewis Acid & Bases
Replies: 3
Views: 60

Re: Bronsted Acids & Bases vs. Lewis Acid & Bases

There might be a few other differences but the rule for Bronsted is that an acid is a proton (H+ ion) donor, and a base is a proton acceptor. And the rule for Lewis bases is that an acid is an electron acceptor, and a base is an electron donor.
by Sydney Stump
Sun Nov 18, 2018 8:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecules with more than 2 different elements
Replies: 3
Views: 47

Re: Molecules with more than 2 different elements

No, it is not a rule because polarity depends not on the amount of elements but the characteristics of the elements.
by Sydney Stump
Sun Nov 18, 2018 6:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Geometry (Drawing)
Replies: 2
Views: 55

Molecular Geometry (Drawing)

Are we required to know how to draw the VSEPR model of a compound or only the lewis structure?
by Sydney Stump
Sun Nov 11, 2018 1:57 pm
Forum: Electronegativity
Topic: difference in electronegativity
Replies: 5
Views: 71

Re: difference in electronegativity

The difference can be calculate but in most cases I believe we are expected to base our answers off of periodic trends rather than the actual numbers.
by Sydney Stump
Sun Nov 11, 2018 1:43 pm
Forum: Electronegativity
Topic: difference in electronegativity
Replies: 5
Views: 71

Re: difference in electronegativity

In our textbook there is an example of a period table that shows electronegativity in chapter two which is used to answer some of the questions at the end of the chapter. However, I believe that we only need to know the general trends for this class right now (not the actual numbers) so there should...
by Sydney Stump
Sat Nov 10, 2018 6:22 pm
Forum: Limiting Reactant Calculations
Topic: Actual Yield
Replies: 7
Views: 200

Re: Actual Yield

Actual yield can only be determined by actually performing the experiment so right now it should always be given in the problem if you are trying to calculate percent yield.
by Sydney Stump
Sun Nov 04, 2018 5:50 pm
Forum: Photoelectric Effect
Topic: Question on kinetic energy
Replies: 5
Views: 91

Re: Question on kinetic energy

It is true that Ek is always equal to 1/2mv^2 - but it can also be used to find the energy of a photon in the sense that Ephoton = Ekinetic + Threshold Energy.
by Sydney Stump
Sun Nov 04, 2018 5:33 pm
Forum: Ionic & Covalent Bonds
Topic: Naming Ionic Compounds
Replies: 5
Views: 56

Naming Ionic Compounds

I am confused as to whether we should be able to name ionic compounds on the test. And if we do have to name them for the test is there an easier way to remember them than just memorizing each individual one?
by Sydney Stump
Fri Nov 02, 2018 3:36 pm
Forum: Lewis Structures
Topic: Lewis Structure Shortcuts
Replies: 1
Views: 27

Lewis Structure Shortcuts

Does anyone have an efficient method for arranging atoms in a Lewis structure? I know how to find the center atom but I don’t know which order to place atoms after that. I feel like I am guessing with some of the larger molecules and trial/error would probably take too long in an exam.
by Sydney Stump
Sun Oct 28, 2018 2:28 pm
Forum: Ionic & Covalent Bonds
Topic: The Stronger Bond [ENDORSED]
Replies: 3
Views: 73

Re: The Stronger Bond [ENDORSED]

It depends on the circumstances which is why people are arguing both sides. In certain conditions covalent bonds are stronger while in other conditions ionic bonds are stronger.
by Sydney Stump
Sun Oct 28, 2018 2:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s and 3d [ENDORSED]
Replies: 2
Views: 55

Re: 4s and 3d [ENDORSED]

Electron shells fill up based on the aufbau principle which basically means that at the ground state of an atom electrons fill up orbitals in the order of lowest energy to highest. 4s is written before 3d because it has a lower energy level. However, once electrons move into 3d, it actually becomes ...
by Sydney Stump
Sun Oct 28, 2018 1:59 pm
Forum: Lewis Structures
Topic: Dots in Lewis Stucture
Replies: 14
Views: 188

Re: Dots in Lewis Stucture

In class last week Lavelle said that arrangement of the dots does not really matter but the location bond is between the two atoms is important.
by Sydney Stump
Fri Oct 19, 2018 11:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test Two: Electron Configuration
Replies: 6
Views: 78

Test Two: Electron Configuration

So I just wanted to check because we spent a little bit of time talking about the electron configuration of multi-electron atoms in the lecture today but will it be on the second test?
by Sydney Stump
Fri Oct 19, 2018 8:47 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 4
Replies: 4
Views: 64

Re: Homework Week 4

I do not think that we are going to finish the entire quantum world section this week so we will probably also hand in homework for it next week.
by Sydney Stump
Fri Oct 19, 2018 8:38 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman vs Balmer
Replies: 6
Views: 70

Re: Lyman vs Balmer

They are important for situation in which electrons change energy levels. For the atomic hydrogen spectrum we are using the rydberg formula in order to determine the wavelength of the lines in the spectrum.
by Sydney Stump
Fri Oct 12, 2018 9:25 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Extensive vs. Intensive
Replies: 2
Views: 92

Re: Extensive vs. Intensive

Intensive properties: density, melting point, boiling point

Extensive properties: volume, mass, energy
by Sydney Stump
Fri Oct 12, 2018 9:17 am
Forum: General Science Questions
Topic: Workshops
Replies: 3
Views: 134

Workshops

Hi - so I’ve been considering attending one of the workshops but I was wondering how helpful people were finding them. Did someone who went to some workshops find them more helpful than office hours?
by Sydney Stump
Fri Oct 12, 2018 9:07 am
Forum: Properties of Light
Topic: Hz to S-1
Replies: 4
Views: 32

Hz to S-1

In one of the homework questions, instead of writing Hz they wrote S-1. What is the correlation between these two units?
by Sydney Stump
Thu Oct 04, 2018 6:40 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 100

Re: Molecular Formula

Yeah, since the molecular structure is shown you only have to count the number of molecules for each element to find the molecular formula.
by Sydney Stump
Thu Oct 04, 2018 3:49 pm
Forum: Balancing Chemical Reactions
Topic: H21
Replies: 1
Views: 69

Re: H21

so the unbalanced equation is C10H15N (s) + O2 (g) = CO2 (g) + H2O (l) + CH4N2O (aq) first balance N (it is the only element that is only in one compound on both sides) 2 C10H15N (s) + O2 (g) = CO2 (g) + H2O (l) + CH4N2O (aq) second balance C right side needs to equal left side (C=20) 2C10H15N (s) +...
by Sydney Stump
Thu Oct 04, 2018 2:43 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions with Heat
Replies: 6
Views: 61

Balancing Chemical Reactions with Heat

I know that in a chemical equation the delta symbol above the arrow means that heat is added to the equation. However, I cannot remember whether the heat changes any of the compounds in the reaction or not. Do you add any products or reactants to the equation if you add heat?

Go to advanced search