Search found 30 matches

by becca_vandyke_4b
Tue Dec 04, 2018 12:28 pm
Forum: Naming
Topic: Anions
Replies: 3
Views: 56

Re: Anions

You can also use the -ate rule to name polyatomic ions. For example NO3- has a negative one charge so its nitrate whereas NO2- is nitrite because it has 2 oxygens verses 3.
by becca_vandyke_4b
Tue Dec 04, 2018 12:25 pm
Forum: Naming
Topic: Determining oxidation number
Replies: 5
Views: 137

Re: Determining oxidation number

Memorize the oxidation numbers of the polyatomic ions like SO4 and use previous knowledge of ions on the periodic table's charge like Cl being -1 and then you deduce the charge of the transition metal since they can differ.
by becca_vandyke_4b
Tue Dec 04, 2018 12:23 pm
Forum: Lewis Acids & Bases
Topic: Naming of acids
Replies: 2
Views: 80

Re: Naming of acids

I would make sure to know the names for all the strong acids and bases. And how to name these if given the compound.
by becca_vandyke_4b
Tue Dec 04, 2018 12:21 pm
Forum: Biological Examples
Topic: Transition metals
Replies: 3
Views: 151

Re: Transition metals

You also need to know how to calculate their oxidation number in a compound since their oxidation number can differ.
by becca_vandyke_4b
Tue Dec 04, 2018 12:21 pm
Forum: Administrative Questions and Class Announcements
Topic: About the test
Replies: 8
Views: 246

Re: About the test

Are we going to get the same equation sheet for the final thats been on the tests? Trying to figure out if I need to memorize any equations.
by becca_vandyke_4b
Tue Dec 04, 2018 12:19 pm
Forum: Naming
Topic: Ligand Names
Replies: 3
Views: 80

Re: Ligand Names

I would also make sure to know the polyatomic ions!
by becca_vandyke_4b
Sun Nov 25, 2018 5:30 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Energy of Interactions
Replies: 4
Views: 72

Re: Energy of Interactions

This is touching on thermochemistry which I believe will not be covered on the test. I think he was just touching on the energy exerted and used during the formation or breaking of bonds to show which ones are stronger/weaker.
by becca_vandyke_4b
Sun Nov 25, 2018 5:25 pm
Forum: Hybridization
Topic: Hybridization
Replies: 4
Views: 99

Re: Hybridization

The number of hybridized orbitals matches the number of electron density regions in the shape of the molecule. So if there are four electron density regions it could be sp3. I don't think there is such thing as sp4 because the p-orbital only has three sub-orbitals.
by becca_vandyke_4b
Sun Nov 25, 2018 5:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 641

Re: Test 3

I thought he said that we will not need to know bond angle. That we will be asked to draw the Lewis Structure and then name the shape.
by becca_vandyke_4b
Mon Nov 19, 2018 1:19 pm
Forum: Dipole Moments
Topic: Polarity and Nonpolarity of the Same Molecule
Replies: 2
Views: 44

Re: Polarity and Nonpolarity of the Same Molecule

I think the main argument of polarity in terms of molecular shape is the idea that the shape affects the polarity of a molecule. If a molecule is octahedral and all the bonds in the molecule have the same charge, then the molecule overall will be non-polar which will affect properties such as meltin...
by becca_vandyke_4b
Mon Nov 19, 2018 1:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 8
Views: 142

Re: Bond Angle

I don't think you need to know the bond angle. But know that a lone pair lone pair repulsion is greater than a bond pair repulsion.
by becca_vandyke_4b
Mon Nov 19, 2018 1:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron geometry vs Molecular geometry
Replies: 3
Views: 79

Re: Electron geometry vs Molecular geometry

I believe that electron geometry affects molecular geometry. For example, if the lone pairs were not arranged in the way they are on a water molecule, then the shape wouldn't be bent.
by becca_vandyke_4b
Sun Nov 11, 2018 7:28 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Interionic/Intermolecular Forces
Replies: 3
Views: 70

Re: Interionic/Intermolecular Forces

A stronger IMF leads to a higher boiling point. Therefore, a compound with strong intermolecular forces would have a high boiling point causing more energy to be needed to change the state from liquid to gas.
by becca_vandyke_4b
Sun Nov 11, 2018 7:27 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Length
Replies: 3
Views: 45

Re: Bond Length

Bond length is the average of all the bonds added up in the molecule. So you would be given the different bond lengths, then you would add them up and divide them by the number of bonds.
by becca_vandyke_4b
Sun Nov 11, 2018 7:25 pm
Forum: Electronegativity
Topic: Radius
Replies: 7
Views: 259

Re: Radius

In terms of coulombs law, as the radius increases, the attraction between the negative electrons and the positive protons inside the nucleus decreases. Therefore, the electrons are more easily removed from the atom. In an element like F, the atomic radius is smaller because the zeff is higher for th...
by becca_vandyke_4b
Sun Nov 04, 2018 4:35 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 2
Views: 43

Re: Expanded Octets

If an atom is in the 3p block or lower, they have an empty d-orbital which allows them to have an expanded octet.
by becca_vandyke_4b
Sun Nov 04, 2018 4:34 pm
Forum: Lewis Structures
Topic: 7th edition 2B.9
Replies: 4
Views: 47

Re: 7th edition 2B.9

I would just go by the idea that if a compound is a salt, aka an ionic bond, you draw them separate. But if it is a molecule, aka a covalent bond, you draw it together.
by becca_vandyke_4b
Sun Nov 04, 2018 4:33 pm
Forum: Photoelectric Effect
Topic: Calculating Wavelength of electron
Replies: 3
Views: 130

Re: Calculating Wavelength of electron

Do you use de Broglie when calculating wave length for an electron and c=lambda times frequency for a photon?
by becca_vandyke_4b
Sat Oct 27, 2018 10:39 am
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 4
Views: 83

Re: periodic table

I agree with what is stated above. A good example of this is Na+ on the first column of the periodic table and Cl- in the 17th column on the periodic table. Na loses one electron by donating it to Cl. The Na+ is a cation and Cl- is an anion.
by becca_vandyke_4b
Sat Oct 27, 2018 10:36 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration of Cations
Replies: 8
Views: 174

Re: Electron Configuration of Cations

if it is a positive charge, you take electrons away from the ground state. If it is a negative charge, you add electrons to the ground state.
by becca_vandyke_4b
Sat Oct 27, 2018 10:35 am
Forum: Ionic & Covalent Bonds
Topic: Ground State
Replies: 6
Views: 143

Re: Ground State

you find the ground state by looking at the periodic table and seeing where the element falls and what s, p, or d orbitals it already fills. And then to get the 3+ charge you take away three electrons from the ground state.
by becca_vandyke_4b
Sun Oct 21, 2018 6:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Slight Confusion
Replies: 3
Views: 76

Re: Slight Confusion

I believe we will not need to use the d-orbital on the test for this week. So I would just understand that there are 5 d orbitals and 3 p orbitals.
by becca_vandyke_4b
Sun Oct 21, 2018 6:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Multi electron atoms
Replies: 5
Views: 98

Re: Multi electron atoms

That equation is known as coulombs law. I think we won't be doing calculations involving it, but instead understanding how it relates to concepts within an atom.
by becca_vandyke_4b
Sun Oct 21, 2018 12:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test 2 Material
Replies: 9
Views: 91

Re: Test 2 Material

Do we need to know how to write out electron configurations for the d-orbital? or is it only s and p orbitals?
by becca_vandyke_4b
Sun Oct 14, 2018 5:23 pm
Forum: Properties of Electrons
Topic: Energy emitted by electrons
Replies: 6
Views: 115

Re: Energy emitted by electrons

I think one of the main ideas is that when an electron "jumps" from a higher energy level to a lower one the energy given off is seen as light. That's why when doing a calculation of an electron moving between the different energy levels when an electron goes to lower one the energy of tha...
by becca_vandyke_4b
Sun Oct 14, 2018 5:19 pm
Forum: Photoelectric Effect
Topic: Purpose of the Photoelectric Effect
Replies: 4
Views: 51

Re: Purpose of the Photoelectric Effect

I think one of the big main points of learning of this effect was 1) the experiment did not occur as expected and 2) drawing the model can help us figure out how to do the math with the different types of energy, such as the energy of photon going towards the metal, the threshold energy, and the ene...
by becca_vandyke_4b
Sun Oct 14, 2018 5:14 pm
Forum: Properties of Light
Topic: Example from Friday's Lecture (10/12/18)
Replies: 3
Views: 43

Re: Example from Friday's Lecture (10/12/18)

You use the mass of the electron when calculating the momentum (p) in the problem. I believe the example he gave us listed the velocity of the electron but not the mass of it. So to calculate p=(m)(v) he plugged in the mass which I guess is considered a constant.
by becca_vandyke_4b
Thu Oct 04, 2018 7:46 pm
Forum: Molarity, Solutions, Dilutions
Topic: V=n/c
Replies: 7
Views: 106

Re: V=n/c

I think in my discussion our TA wrote molar mass out as Mr (but that might just be what she does) where as molarity is always a capital M. I would make sure you don't mix that up in because there are other equations in chemistry such as p=mv for momentum problems where m=mass.
by becca_vandyke_4b
Thu Oct 04, 2018 7:40 pm
Forum: SI Units, Unit Conversions
Topic: Naming Compounds
Replies: 9
Views: 229

Re: Naming Compounds

For the states of the compounds you also have to know if they are soluble or not (but he said we don't need to know the rules yet) but anyways some compounds like those with NO3- are soluble in water so they become aqueous. I think you can just look at a solubility chart right now for the problems a...
by becca_vandyke_4b
Thu Oct 04, 2018 7:35 pm
Forum: SI Units, Unit Conversions
Topic: Textbook Homework Assignment
Replies: 11
Views: 453

Re: Textbook Homework Assignment

My TA said that if you do more than 7 problems that you should copy down 7 problems on a separate page and turn those in because they have to grade so many. She also said that we could write down the problem number not the whole problem.

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