Search found 30 matches
- Sun Dec 02, 2018 11:24 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric compounds besides water
- Replies: 6
- Views: 547
Re: Amphoteric compounds besides water
HSO4^1- and HPO4^2- are examples of amphoteric compounds
- Sun Dec 02, 2018 11:23 pm
- Forum: Lewis Acids & Bases
- Topic: lewis acids & bases
- Replies: 3
- Views: 519
Re: lewis acids & bases
Lone pairs on lewis structures determine whether or not a molecule can donate an electron pair/is a lewis acid.
- Sun Dec 02, 2018 11:19 pm
- Forum: Conjugate Acids & Bases
- Topic: Clarification of Conjugate Acids and Bases
- Replies: 4
- Views: 564
Re: Clarification of Conjugate Acids and Bases
Conjugate acids and bases solely differ by one proton.
- Tue Nov 27, 2018 1:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angle
- Replies: 5
- Views: 1644
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 <...
- Tue Nov 27, 2018 1:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T shaped
- Replies: 6
- Views: 584
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.
- Tue Nov 27, 2018 1:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity vs. nonpolarity
- Replies: 8
- Views: 688
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
- Sun Nov 18, 2018 10:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: lone pair influence on shape
- Replies: 12
- Views: 4396
Re: lone pair influence on shape
Lone pairs disrupt the shape by making the angles between molecules smaller
- Sun Nov 18, 2018 10:49 pm
- Forum: Hybridization
- Topic: Bond Angles
- Replies: 12
- Views: 1160
Re: Bond Angles
Drawing out the shape or simply determining the shape through visualization is the best way to determine the shape.
- Sun Nov 18, 2018 10:46 pm
- Forum: Hybridization
- Topic: Sigma/Pi bonds
- Replies: 6
- Views: 866
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.
- 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: 2047
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
- Sun Nov 11, 2018 8:03 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum number Ms
- Replies: 3
- Views: 697
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
- Sun Nov 11, 2018 7:57 pm
- Forum: Properties of Electrons
- Topic: Polar vs Non polar
- Replies: 15
- Views: 4789
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.
- Sun Nov 11, 2018 2:13 pm
- Forum: Properties of Light
- Topic: Photoelectric Effect - waves vs. photons
- Replies: 3
- Views: 631
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.
- Sun Nov 11, 2018 2:09 pm
- Forum: Properties of Light
- Topic: calculating wavelength
- Replies: 10
- Views: 1181
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.
- Sun Nov 11, 2018 2:07 pm
- Forum: Properties of Light
- Topic: Quantum Test
- Replies: 11
- Views: 1279
Re: Quantum Test
I reccommend watching khan academy or reading through the textbook. Rewriting the notes was particularly helpful to me
- Sun Nov 11, 2018 2:01 pm
- Forum: Ionic & Covalent Bonds
- Topic: Determining ionic character vs covalent
- Replies: 3
- Views: 419
Re: Determining ionic character vs covalent
You calculate the individual electronegativities of the p-cl bond and then add them together.
- Sun Nov 11, 2018 1:57 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metallic Bond
- Replies: 7
- Views: 680
Re: Metallic Bond
I believe a metallic bond is a bond between two metals.
- Sun Nov 11, 2018 1:56 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 4
- Views: 494
Re: Polarizability
smaller anions have more polarizability. As atoms get bigger in size, they have more polarizing power.
- Fri Oct 26, 2018 8:54 pm
- Forum: Electronegativity
- Topic: Electroegativity
- Replies: 9
- Views: 1287
Re: Electroegativity
Actual, numeric values for electronegativity are the only way to determine the electronegativity of elements aside from using the periodic trend
- Fri Oct 26, 2018 8:52 pm
- Forum: Lewis Structures
- Topic: octets
- Replies: 13
- Views: 1121
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...
- Fri Oct 26, 2018 8:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy vs. Electronegativity
- Replies: 5
- Views: 557
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.
- 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: 3952
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?
- Tue Oct 16, 2018 2:34 pm
- Forum: SI Units, Unit Conversions
- Topic: formula units [ENDORSED]
- Replies: 69
- Views: 32922
Re: formula units [ENDORSED]
Formula Units are the same thing as molecules except for compounds with ionic bonds.
- Tue Oct 16, 2018 2:33 pm
- Forum: Properties of Electrons
- Topic: Free vs. Bound Electrons
- Replies: 6
- Views: 6004
Re: Free vs. Bound Electrons
Valence electrons are simply bound electrons in the outermost electron levels surrounding the nucleus.
- Tue Oct 16, 2018 2:31 pm
- Forum: Properties of Electrons
- Topic: Rydberg constant
- Replies: 7
- Views: 842
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.
- Fri Oct 05, 2018 11:30 am
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 9
- Views: 1759
Re: Sig Figs
I would round on your last step because the more you round the more your answer becomes inaccurate.
- Fri Oct 05, 2018 11:28 am
- Forum: General Science Questions
- Topic: Moles vs Number of Molecules
- Replies: 5
- Views: 774
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.
- Fri Oct 05, 2018 11:27 am
- Forum: General Science Questions
- Topic: Moles vs Number of Molecules
- Replies: 5
- Views: 774
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.
- Fri Oct 05, 2018 11:23 am
- Forum: General Science Questions
- Topic: Common ions
- Replies: 4
- Views: 591
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.
- Fri Oct 05, 2018 11:20 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 444479
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.