Search found 30 matches

by 905096106
Sun Dec 02, 2018 11:24 pm
Forum: Amphoteric Compounds
Topic: Amphoteric compounds besides water
Replies: 6
Views: 126

Re: Amphoteric compounds besides water

HSO4^1- and HPO4^2- are examples of amphoteric compounds
by 905096106
Sun Dec 02, 2018 11:23 pm
Forum: Lewis Acids & Bases
Topic: lewis acids & bases
Replies: 3
Views: 78

Re: lewis acids & bases

Lone pairs on lewis structures determine whether or not a molecule can donate an electron pair/is a lewis acid.
by 905096106
Sun Dec 02, 2018 11:19 pm
Forum: Conjugate Acids & Bases
Topic: Clarification of Conjugate Acids and Bases
Replies: 4
Views: 108

Re: Clarification of Conjugate Acids and Bases

Conjugate acids and bases solely differ by one proton.
by 905096106
Tue Nov 27, 2018 1:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angle
Replies: 5
Views: 185

Re: Bond angle

No. Although both shapes have the same shape (bent) their bond angles are different because they have different electron geometry. AX2E has trigonal planar electron geometry while AX2E2 has tetrahedral electron geometry. Because of this AX2E has a bond angle of <120 while AX2E2 has a bond angle of <...
by 905096106
Tue Nov 27, 2018 1:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T shaped
Replies: 6
Views: 115

Re: T shaped

It is not trigonal planar because of the additional two lone pairs. These distort the shape and make the bond angles smaller so the 120 degree angle found on trigonal planar shapes is not obtained.
by 905096106
Tue Nov 27, 2018 1:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity vs. nonpolarity
Replies: 8
Views: 162

Re: polarity vs. nonpolarity

I would suggest first looking at the lewis structure and determining if it is symmetrical, this can be figured out by whether or not all the atoms surrounding the central atom are the same i.e. CCl4
by 905096106
Sun Nov 18, 2018 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pair influence on shape
Replies: 12
Views: 222

Re: lone pair influence on shape

Lone pairs disrupt the shape by making the angles between molecules smaller
by 905096106
Sun Nov 18, 2018 10:49 pm
Forum: Hybridization
Topic: Bond Angles
Replies: 12
Views: 259

Re: Bond Angles

Drawing out the shape or simply determining the shape through visualization is the best way to determine the shape.
by 905096106
Sun Nov 18, 2018 10:46 pm
Forum: Hybridization
Topic: Sigma/Pi bonds
Replies: 6
Views: 160

Re: Sigma/Pi bonds

Understanding the sigma/pi bond composition of a bond helps you to understand the internal structure of the bond and what it looks like.
by 905096106
Sun Nov 11, 2018 8:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Number of Electrons based on principle quantum number
Replies: 2
Views: 262

Re: Number of Electrons based on principle quantum number

The way this is solved is by counting the total number of electrons in all the orbitals with a certain n. For n=3 there could 3s 3p and 3d so thats 2+6+10 so 18 possible
by 905096106
Sun Nov 11, 2018 8:03 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum number Ms
Replies: 3
Views: 294

Re: Quantum number Ms

The +1/2 electrons are the first half of electrons in an orbital. For example each orbital is filled by a +1/2 first and then a -1/2 electron
by 905096106
Sun Nov 11, 2018 7:57 pm
Forum: Properties of Electrons
Topic: Polar vs Non polar
Replies: 15
Views: 602

Re: Polar vs Non polar

Polar versus nonpolar is very difficult to determine but it is based off of the difference in electronegativity between the atoms in a molecule. usually if the molecule is very symmetrical with its lewis dot structure then it will be nonpolar.
by 905096106
Sun Nov 11, 2018 2:13 pm
Forum: Properties of Light
Topic: Photoelectric Effect - waves vs. photons
Replies: 3
Views: 165

Re: Photoelectric Effect - waves vs. photons

Increasing intensity only increases the amount of photons not the energy of each individual photon. Light is acting as a particle in this case however in general light can act as a particle or a wave.
by 905096106
Sun Nov 11, 2018 2:09 pm
Forum: Properties of Light
Topic: calculating wavelength
Replies: 10
Views: 391

Re: calculating wavelength

The de broglie equation is used when taking mass into account. I.E. calculating the wave length of an electron or an atom instead of a photon of light.
by 905096106
Sun Nov 11, 2018 2:07 pm
Forum: Properties of Light
Topic: Quantum Test
Replies: 11
Views: 407

Re: Quantum Test

I reccommend watching khan academy or reading through the textbook. Rewriting the notes was particularly helpful to me
by 905096106
Sun Nov 11, 2018 2:01 pm
Forum: Ionic & Covalent Bonds
Topic: Determining ionic character vs covalent
Replies: 3
Views: 77

Re: Determining ionic character vs covalent

You calculate the individual electronegativities of the p-cl bond and then add them together.
by 905096106
Sun Nov 11, 2018 1:57 pm
Forum: Ionic & Covalent Bonds
Topic: Metallic Bond
Replies: 7
Views: 135

Re: Metallic Bond

I believe a metallic bond is a bond between two metals.
by 905096106
Sun Nov 11, 2018 1:56 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 4
Views: 89

Re: Polarizability

smaller anions have more polarizability. As atoms get bigger in size, they have more polarizing power.
by 905096106
Fri Oct 26, 2018 8:54 pm
Forum: Electronegativity
Topic: Electroegativity
Replies: 9
Views: 510

Re: Electroegativity

Actual, numeric values for electronegativity are the only way to determine the electronegativity of elements aside from using the periodic trend
by 905096106
Fri Oct 26, 2018 8:52 pm
Forum: Lewis Structures
Topic: octets
Replies: 13
Views: 267

Re: octets

You can distinguish if an atom has a full octet by their number of valence electrons and core electrons. With these numbers you can determine how shells would fill up. Essentially a full octet means that an atom would have 8 valence electrons (a noble gas). In their efforts to bond, atoms look to fo...
by 905096106
Fri Oct 26, 2018 8:49 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy vs. Electronegativity
Replies: 5
Views: 95

Re: Ionization Energy vs. Electronegativity

Ionization Energy and Electronegativity are also related because if an electron has high electronegativity then it will be more difficult to remove electrons and therefore the ionization energy will be higher.
by 905096106
Wed Oct 17, 2018 5:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Confused on Problem 1.57 (regarding the Balmer Series)
Replies: 9
Views: 1702

Re: Confused on Problem 1.57 (regarding the Balmer Series)

I believe it is because if you count the first given wavelength would be n = 3, then n=4 and so on... does that help?
by 905096106
Tue Oct 16, 2018 2:34 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 69
Views: 22585

Re: formula units [ENDORSED]

Formula Units are the same thing as molecules except for compounds with ionic bonds.
by 905096106
Tue Oct 16, 2018 2:33 pm
Forum: Properties of Electrons
Topic: Free vs. Bound Electrons
Replies: 6
Views: 143

Re: Free vs. Bound Electrons

Valence electrons are simply bound electrons in the outermost electron levels surrounding the nucleus.
by 905096106
Tue Oct 16, 2018 2:31 pm
Forum: Properties of Electrons
Topic: Rydberg constant
Replies: 7
Views: 185

Re: Rydberg constant

Lavelle did not go over the equation for energy level changes during lecture but explained how to implement the constant without having to memorize the formula.
by 905096106
Fri Oct 05, 2018 11:30 am
Forum: General Science Questions
Topic: Sig Figs
Replies: 9
Views: 879

Re: Sig Figs

I would round on your last step because the more you round the more your answer becomes inaccurate.
by 905096106
Fri Oct 05, 2018 11:28 am
Forum: General Science Questions
Topic: Moles vs Number of Molecules
Replies: 5
Views: 243

Re: Moles vs Number of Molecules

I would say moles is a more correct way to say it because the coefficients used in chemical equations represent the ratio in moles within the chemical reaction.
by 905096106
Fri Oct 05, 2018 11:27 am
Forum: General Science Questions
Topic: Moles vs Number of Molecules
Replies: 5
Views: 243

Re: Moles vs Number of Molecules

I would say moles is a more correct way to say it because the coefficients used in chemical equations represent the ratio in moles within the chemical reaction.
by 905096106
Fri Oct 05, 2018 11:23 am
Forum: General Science Questions
Topic: Common ions
Replies: 4
Views: 190

Re: Common ions

The best tactic that worked for me would be taking small groups of ions and writing each one four or five times in a unique color. I did this my sophomore year of high school and it has helped me remember the ions even today.
by 905096106
Fri Oct 05, 2018 11:20 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 166
Views: 100948

Re: Rusty on High School Chem [ENDORSED]

I definitely understand your struggles. I am a freshman and I haven't taken chemistry since my senior year of high school. I agree with the others above that your best bet would be to read the textbook and review the modules posted on the website.

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