Search found 30 matches

by Sarai Ventura 1L
Sun Jun 10, 2018 9:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charge of ligands
Replies: 5
Views: 183

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.
by Sarai Ventura 1L
Sun Jun 10, 2018 8:47 pm
Forum: Ideal Gases
Topic: Memorization
Replies: 12
Views: 321

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.
by Sarai Ventura 1L
Sun Jun 10, 2018 8:42 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 4
Views: 204

Re: Strong Acids

You should know the common strong acids used like HCl,HNO3, HBr, HI, HClO3.
by Sarai Ventura 1L
Sun Jun 03, 2018 4:36 pm
Forum: Hybridization
Topic: How to identify pi and sigma bonds
Replies: 4
Views: 131

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...
by Sarai Ventura 1L
Sun Jun 03, 2018 4:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis and trans
Replies: 7
Views: 191

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...
by Sarai Ventura 1L
Sun Jun 03, 2018 4:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 226

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.
by Sarai Ventura 1L
Thu May 24, 2018 5:22 pm
Forum: Electronegativity
Topic: Question for Exams [ENDORSED]
Replies: 5
Views: 294

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.
by Sarai Ventura 1L
Thu May 24, 2018 5:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 10
Views: 232

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...
by Sarai Ventura 1L
Thu May 24, 2018 4:59 pm
Forum: Ionic & Covalent Bonds
Topic: Formal charge?
Replies: 12
Views: 423

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...
by Sarai Ventura 1L
Sun May 20, 2018 4:35 pm
Forum: Resonance Structures
Topic: How does a resonance structure work?
Replies: 10
Views: 279

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...
by Sarai Ventura 1L
Sun May 20, 2018 4:07 pm
Forum: Electronegativity
Topic: Carbon and Sulfur electronegativity?
Replies: 4
Views: 1450

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...
by Sarai Ventura 1L
Sun May 20, 2018 3:50 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bonds
Replies: 4
Views: 328

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.
by Sarai Ventura 1L
Sun May 13, 2018 9:11 pm
Forum: Sigma & Pi Bonds
Topic: Hybrid orbitals
Replies: 4
Views: 250

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...
by Sarai Ventura 1L
Sun May 13, 2018 9:01 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 13
Views: 563

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.
by Sarai Ventura 1L
Sun May 13, 2018 8:57 pm
Forum: Lewis Structures
Topic: Valence shell on Noble gases
Replies: 4
Views: 147

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 ...
by Sarai Ventura 1L
Sun May 06, 2018 3:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hund's Rule [ENDORSED]
Replies: 6
Views: 220

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.
by Sarai Ventura 1L
Sun May 06, 2018 3:11 pm
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 425

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.
by Sarai Ventura 1L
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: 3179

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.
by Sarai Ventura 1L
Thu Apr 26, 2018 3:13 pm
Forum: Photoelectric Effect
Topic: What is work function? [ENDORSED]
Replies: 15
Views: 1023

Re: What is work function? [ENDORSED]

Work function is the minimum quantity of energy that is required to remove an electron from a metal.
by Sarai Ventura 1L
Thu Apr 26, 2018 3:05 pm
Forum: Einstein Equation
Topic: converting from keV to joules
Replies: 7
Views: 269

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.
by Sarai Ventura 1L
Thu Apr 26, 2018 2:54 pm
Forum: Properties of Electrons
Topic: Information Provided on Exam
Replies: 6
Views: 274

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.
by Sarai Ventura 1L
Sun Apr 22, 2018 11:50 am
Forum: Properties of Light
Topic: Memorizing Wavelengths [ENDORSED]
Replies: 4
Views: 166

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
by Sarai Ventura 1L
Sun Apr 22, 2018 11:40 am
Forum: Properties of Light
Topic: Speed of Light which is more accurate? [ENDORSED]
Replies: 6
Views: 181

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.
by Sarai Ventura 1L
Wed Apr 18, 2018 8:47 am
Forum: Properties of Light
Topic: still don't uderrsatnd what a photon is [ENDORSED]
Replies: 20
Views: 385

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.
by Sarai Ventura 1L
Sun Apr 15, 2018 4:28 pm
Forum: Properties of Light
Topic: wavelength description [ENDORSED]
Replies: 11
Views: 318

Re: wavelength description [ENDORSED]

According to the textbook, the amplitude represents the height of the wave above the center line.
by Sarai Ventura 1L
Thu Apr 12, 2018 9:26 am
Forum: SI Units, Unit Conversions
Topic: What is the notation for molar mass?
Replies: 15
Views: 545

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).
by Sarai Ventura 1L
Thu Apr 12, 2018 9:06 am
Forum: Properties of Light
Topic: Homework? [ENDORSED]
Replies: 10
Views: 339

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.
by Sarai Ventura 1L
Thu Apr 12, 2018 9:01 am
Forum: Properties of Light
Topic: HW 1.3 [ENDORSED]
Replies: 12
Views: 435

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.
by Sarai Ventura 1L
Wed Apr 11, 2018 9:18 am
Forum: Significant Figures
Topic: Why are sig figs important?
Replies: 13
Views: 1084

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.
by Sarai Ventura 1L
Wed Apr 11, 2018 9:03 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework Problem G17
Replies: 2
Views: 119

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).

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