Search found 30 matches
- Sun Jun 10, 2018 9:04 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charge of ligands
- Replies: 5
- Views: 682
Re: Charge of ligands
Yes I think it would be helpful to know the charges to save time and I think you should know the common ones.
- Sun Jun 10, 2018 8:47 pm
- Forum: Ideal Gases
- Topic: Memorization
- Replies: 12
- Views: 1195
Re: Memorization
No, you do not need to memorize it because it should be given on the front page of the constant page but you should be able to know how to properly apply it and know the units so you won't get point taken off.
- Sun Jun 10, 2018 8:42 pm
- Forum: Lewis Acids & Bases
- Topic: Strong Acids
- Replies: 4
- Views: 607
Re: Strong Acids
You should know the common strong acids used like HCl,HNO3, HBr, HI, HClO3.
- Sun Jun 03, 2018 4:36 pm
- Forum: Hybridization
- Topic: How to identify pi and sigma bonds
- Replies: 4
- Views: 732
Re: How to identify pi and sigma bonds
To Hope_Pham_1G Pi bonds are usually weaker than sigma bonds.This is contrasted by sigma bonds which form bonding orbitals directly between the nuclei of the bonding atoms, resulting in greater overlap and a strong sigma bond. Pi bonds result from overlap of atomic orbitals that are in contact throu...
- Sun Jun 03, 2018 4:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: cis and trans
- Replies: 7
- Views: 977
Re: cis and trans
The main difference between the two is that the cis isomer is a polar molecule whereas the trans isomer is non-polar. Both of the isomers have exactly the same atoms joined up in exactly the same order. That means that the van der Waals dispersion forces between the molecules will be identical in bo...
- Sun Jun 03, 2018 4:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 7
- Views: 813
Re: Bond Angles
For the final you should just remember the common bond angles and not the special cases bonds. You are welcome to review them but do not try to memorize them.
- Thu May 24, 2018 5:22 pm
- Forum: Electronegativity
- Topic: Question for Exams [ENDORSED]
- Replies: 5
- Views: 887
Re: Question for Exams [ENDORSED]
You do not need to know or try to memorize the exact electronegativity values you just have to know the general trend of the periodic table.
- Thu May 24, 2018 5:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 10
- Views: 1119
Re: Bond Angle
Molecular geometries can be specified in terms of bond lengths and bond angles. The bond length is defined to be the average distance between the nuclei of two atoms bonded together in any given molecule. A bond angle is the angle formed between three atoms across at least two bonds. The bond angles...
- Thu May 24, 2018 4:59 pm
- Forum: Ionic & Covalent Bonds
- Topic: Formal charge?
- Replies: 12
- Views: 1385
Re: Formal charge?
According to the book formal charge is the electric charge of an atom in a molecule assigned on the assumption that the bonding is nonpolar covalent. Formal Charge (FC)= number off valence electrons in the free atom-(number of lone pair electrons+1/2 x number of shared electrons). However, since the...
- Sun May 20, 2018 4:35 pm
- Forum: Resonance Structures
- Topic: How does a resonance structure work?
- Replies: 10
- Views: 1088
Re: How does a resonance structure work?
Resonance structures are two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure. Resonance occurs when electrons can flow through neighboring pi systems. It is also known as a mesomerism and it is a way of describing del...
- Sun May 20, 2018 4:07 pm
- Forum: Electronegativity
- Topic: Carbon and Sulfur electronegativity?
- Replies: 4
- Views: 14653
Re: Carbon and Sulfur electronegativity?
Well you have to keep in mind which element is closest to Fluorine which is the most electronegative element, my TA showed us a helpful tip to remember, she uses FONCl which will go on to FOClBrISCHP (following the trend) this can help you remember the order of the electronegativities of the nonmeta...
- Sun May 20, 2018 3:50 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bonds
- Replies: 4
- Views: 966
Re: Coordinate Covalent Bonds
A covalent chemical bond between two atoms that is produced when one atom shares a pair of electrons with another atom that lacks such a pair. Also known as a covalent bond in which both the shared electrons are contributed by one of the two atoms.
- Sun May 13, 2018 9:11 pm
- Forum: Sigma & Pi Bonds
- Topic: Hybrid orbitals
- Replies: 4
- Views: 605
Re: Hybrid orbitals
The hybridization of orbitals is also greatly favored because hybridized orbitals are lower in energy compared to their separated, unhybridized counterparts. This results in more stable compounds when hybridization occurs. For example, carbon has four unpaired electrons it can have four equal energy...
- Sun May 13, 2018 9:01 pm
- Forum: Resonance Structures
- Topic: Radicals
- Replies: 13
- Views: 1448
Radicals
On Friday during lecture the TA's talked about radicals, can someone please explain when we are able to use them or the concept of radicals.
Thank You.
Thank You.
- Sun May 13, 2018 8:57 pm
- Forum: Lewis Structures
- Topic: Valence shell on Noble gases
- Replies: 4
- Views: 590
Re: Valence shell on Noble gases
No because you have to keep in mind that noble gases have full outer shell of electrons. Helium has two electrons in its outer shell and the rest have eight electrons. Because of their full outer shells, they are very inert and stable. This means they don't tend to react with other elements to form ...
- Sun May 06, 2018 3:21 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Hund's Rule [ENDORSED]
- Replies: 6
- Views: 1124
Re: Hund's Rule [ENDORSED]
Hund's rule is that every orbital in a subshell must be occupied with one electron before any one orbital is doubly occupied.
- Sun May 06, 2018 3:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: cation vs anion
- Replies: 14
- Views: 3609
Re: cation vs anion
Those with a negative charge are called anions and those with a positive charge are called cations. The way I remember is that anions have two n's for negative and cations have a "t" just like the plus sign for positive.
- Sun May 06, 2018 2:58 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Nodal Planes- what are they exactly? [ENDORSED]
- Replies: 6
- Views: 16150
Re: Nodal Planes- what are they exactly? [ENDORSED]
A nodal plane is a plane with the probability of finding a electron is zero. The 2s orbital has a nodal shell, whereas the 2pz orbital or 2p orbitals have a nodal plane.
- Thu Apr 26, 2018 3:13 pm
- Forum: Photoelectric Effect
- Topic: What is work function? [ENDORSED]
- Replies: 15
- Views: 5635
Re: What is work function? [ENDORSED]
Work function is the minimum quantity of energy that is required to remove an electron from a metal.
- Thu Apr 26, 2018 3:05 pm
- Forum: Einstein Equation
- Topic: converting from keV to joules
- Replies: 7
- Views: 843
Re: converting from keV to joules
I do not think that you have to memorize that. All the conversions you need are usually given on the front page.
- Thu Apr 26, 2018 2:54 pm
- Forum: Properties of Electrons
- Topic: Information Provided on Exam
- Replies: 6
- Views: 729
Re: Information Provided on Exam
I think only constants and formulas would be given on the front page. Information like ranges of high to low frequency and wavelength would not be given but it would be helpful to know.
- Sun Apr 22, 2018 11:50 am
- Forum: Properties of Light
- Topic: Memorizing Wavelengths [ENDORSED]
- Replies: 4
- Views: 503
Re: Memorizing Wavelengths [ENDORSED]
I think it would be helpful to know the order how large the electromagnetic wave is.It would help to know the increasing wavelengths and frequency just remember that they are inverse to one another
- Sun Apr 22, 2018 11:40 am
- Forum: Properties of Light
- Topic: Speed of Light which is more accurate? [ENDORSED]
- Replies: 6
- Views: 2204
Re: Speed of Light which is more accurate? [ENDORSED]
It does not make a big difference I know that the professor uses 3.0x10^8 while the textbook uses 2.998x10^8. If the test has the constant formula on the front page then use what they give you and if not just use one that you prefer.
- Wed Apr 18, 2018 8:47 am
- Forum: Properties of Light
- Topic: still don't uderrsatnd what a photon is [ENDORSED]
- Replies: 20
- Views: 1319
Re: still don't uderrsatnd what a photon is [ENDORSED]
A photon is a particle that represents a quantum of light or other electromagnetic radiation. It also carries energy proportional to the radiation frequency.
- Sun Apr 15, 2018 4:28 pm
- Forum: Properties of Light
- Topic: wavelength description [ENDORSED]
- Replies: 11
- Views: 1185
Re: wavelength description [ENDORSED]
According to the textbook, the amplitude represents the height of the wave above the center line.
- Thu Apr 12, 2018 9:26 am
- Forum: SI Units, Unit Conversions
- Topic: What is the notation for molar mass?
- Replies: 15
- Views: 4701
Re: What is the notation for molar mass?
The notation for molar mass is a capital M, just remember to pay attention to the units the molar mass unit is (g/mol).
- Thu Apr 12, 2018 9:06 am
- Forum: Properties of Light
- Topic: Homework? [ENDORSED]
- Replies: 10
- Views: 1021
Re: Homework? [ENDORSED]
Homework is everything we have covered in class until now. The homework is basically on the review section and perhaps you can do a couple of problems on chapter one just do not do the same ones from last week. Yes, it is on personal reference how you want to do it.
- Thu Apr 12, 2018 9:01 am
- Forum: Properties of Light
- Topic: HW 1.3 [ENDORSED]
- Replies: 12
- Views: 1630
Re: HW 1.3 [ENDORSED]
Option A is incorrect because the speed is constant. Option C is correct because the longer the wavelength is causes the slope to decrease.
- Wed Apr 11, 2018 9:18 am
- Forum: Significant Figures
- Topic: Why are sig figs important?
- Replies: 13
- Views: 16099
Re: Why are sig figs important?
I believe that sig figs are important in measurements because it allows to have a more accurate and precise calculation.They also let us know when it is okay to round.
- Wed Apr 11, 2018 9:03 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework Problem G17
- Replies: 2
- Views: 1284
Homework Problem G17
(a)Determine the mass of anhydrous copper(II) sulfate that must be used to prepare 250mL of 0.20M CuSO4 (aq). (b) Determine the mass of CuSO4x5H20 that must be used to prepare 250mL of 0.20 M CuSO4(aq).