Search found 40 matches

by Mohamad Farhat 1L
Wed Jun 13, 2018 8:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligands?
Replies: 3
Views: 304

ligands?

do we have to memorize ligands?
by Mohamad Farhat 1L
Wed Jun 13, 2018 4:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 2
Views: 176

Re: Ligands

A ligand is any molecule or ion that can donate a lone pair of electrons to a transition metal ion to form a covalent bond.Ligands must have one or more lone pairs of electrons. Ligands may be neutral or charge
by Mohamad Farhat 1L
Wed Jun 13, 2018 4:34 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 1
Views: 145

Re: Radicals

yes by the central atom

such as ch3

.
h -c-h
|
h
by Mohamad Farhat 1L
Wed Jun 13, 2018 4:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number
Replies: 1
Views: 152

Re: Oxidation Number

An atom is said to have a nonzero net charge only when it either loses or gains electrons to become an ion.
Ionic charge >3+, 3-
Charge on an atom inside a compound
Oxidation number >+3, -3
by Mohamad Farhat 1L
Sun Jun 10, 2018 11:03 pm
Forum: Naming
Topic: Naming
Replies: 5
Views: 290

Re: Naming

I believe it is 72°, 90°
by Mohamad Farhat 1L
Sun Jun 10, 2018 10:58 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: final [ENDORSED]
Replies: 4
Views: 315

final [ENDORSED]

do we need to know molecular orbital theory, bond order etc for the exam?
by Mohamad Farhat 1L
Sun Jun 10, 2018 10:56 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pOH
Replies: 5
Views: 258

Re: pOH

I believe so we do.
by Mohamad Farhat 1L
Sat Jun 09, 2018 5:39 pm
Forum: Lewis Acids & Bases
Topic: Final Layout
Replies: 2
Views: 153

Re: Final Layout

the final is evenly distributed throughout the whole course. Each chapter will have problems on the exam
by Mohamad Farhat 1L
Fri Jun 08, 2018 3:04 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Solubility and Polarity
Replies: 3
Views: 237

Re: Solubility and Polarity

polarity does affect solubility in water, because like dissolves like. If the substance is polar it will dissolve well, and if it is nonpolar, the substance will not dissolve as well.
by Mohamad Farhat 1L
Sat Jun 02, 2018 5:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand and coordination sphere
Replies: 2
Views: 111

Re: Ligand and coordination sphere

Ligands are ions or neutral molecules that bond to a central metal atom or ion. Ligands act as Lewis bases (electron pair donors), and the central atom acts as a Lewis acid. Ligands have at least one donor atom with an electron pair used to form covalent bonds with the central atom.
by Mohamad Farhat 1L
Sat Jun 02, 2018 5:22 pm
Forum: Sigma & Pi Bonds
Topic: Detail of Bonds
Replies: 3
Views: 230

Re: Detail of Bonds

1 single bond = 1 sigma bond

1 double bond = 1 sigma bond + 1 pi bond

1 triple bond = 1 sigma bond + 2 pi bonds
by Mohamad Farhat 1L
Sat Jun 02, 2018 5:20 pm
Forum: Electronegativity
Topic: Test 3. Question 7.
Replies: 6
Views: 283

Re: Test 3. Question 7.

cacl2 mgcl2

3.16-1.00 3.16-1.31
2.16 en. 1.85 en

cacl2 has greater ionic character
by Mohamad Farhat 1L
Sat Jun 02, 2018 5:16 pm
Forum: Bond Lengths & Energies
Topic: Test 3 Q 8 [ENDORSED]
Replies: 9
Views: 442

Re: Test 3 Q 8 [ENDORSED]

the small number of elements the stronger the bond. since both have 6 bonds. 1st one has two double and two single and the second has 3 elements with 3 double bonds. which makes it stronger
by Mohamad Farhat 1L
Thu May 24, 2018 6:36 pm
Forum: Ionic & Covalent Bonds
Topic: Polar Vs. Non-Polar
Replies: 7
Views: 254

Re: Polar Vs. Non-Polar

to add on the comment above, is when to determining a ionic, polar or non polar covalent bond, you find the difference In electronegativity and if the difference range from 0 to 0.4 then it is a covalent bond and if it ranges from .5 to 1.7 then it is a polar covalent bond, if it is more than 1.7 th...
by Mohamad Farhat 1L
Wed May 23, 2018 4:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: shape of water
Replies: 8
Views: 209

Re: shape of water

I think it matters how many 90 degree lp-bp interactions there are rather than how far apart the lone pairs are.
by Mohamad Farhat 1L
Mon May 14, 2018 2:15 pm
Forum: Lewis Structures
Topic: in class example bf^3 [ENDORSED]
Replies: 2
Views: 111

in class example bf^3 [ENDORSED]

why does it only have 6 valence electrons? I didn't understand it clearly.
by Mohamad Farhat 1L
Thu May 10, 2018 2:08 pm
Forum: Quantum Numbers and The H-Atom
Topic: Homework Question 2.41
Replies: 3
Views: 221

Re: Homework Question 2.41

since n= 5 then n-1, to get ml, 5-1 is = is 4. l in that problem is 0. based on what you gave me.
but generally n= the number. to get l it is n-1. to get ml it is -l to l values.
by Mohamad Farhat 1L
Wed May 09, 2018 5:03 pm
Forum: Trends in The Periodic Table
Topic: question
Replies: 6
Views: 287

question

what is the difference between electron affinity and electronegativity?
by Mohamad Farhat 1L
Tue May 08, 2018 4:43 pm
Forum: Trends in The Periodic Table
Topic: question confused
Replies: 2
Views: 186

Re: question confused

thank you!
by Mohamad Farhat 1L
Tue May 08, 2018 11:22 am
Forum: Trends in The Periodic Table
Topic: question confused
Replies: 2
Views: 186

question confused

how can we determine 1st round of ionization compared to 2nd round of ionization energy?
by Mohamad Farhat 1L
Sun May 06, 2018 10:24 pm
Forum: Molarity, Solutions, Dilutions
Topic: test 1
Replies: 1
Views: 154

test 1

is their a way we can see the final answers of quiz 1?
by Mohamad Farhat 1L
Thu May 03, 2018 12:59 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Lewis Structure [ENDORSED]
Replies: 7
Views: 258

Re: Lewis Structure [ENDORSED]

just choose the central atom, count the electrons and then place the electrons around the atoms.if theres a charge then place a bracket and write the subscript. but it docent matter unless theres a bond to it.
by Mohamad Farhat 1L
Wed May 02, 2018 6:40 pm
Forum: Quantum Numbers and The H-Atom
Topic: valence electrons question
Replies: 2
Views: 149

valence electrons question

which element can have valence electrons with the quantum numbers:

a)n= 2, l=1

can someone explains this throughly.
by Mohamad Farhat 1L
Tue May 01, 2018 6:28 pm
Forum: Quantum Numbers and The H-Atom
Topic: question on a problem
Replies: 1
Views: 96

question on a problem

find the max electrons in an atom
n=2 , l=1, ml=1, ms=+1/2
the answer is that there is 1 electron why is that.
I know that when there is 1 ml then that means there is 2 electrons. does ms make it 1 electron?
by Mohamad Farhat 1L
Tue May 01, 2018 5:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shells?
Replies: 7
Views: 263

Re: Shells?

from my understanding, principle quantum number, describes the energy level of the electron that its located in. example, if an electron lies on the first energy level then the electrons principle number is n=1. hope this is helpful.
by Mohamad Farhat 1L
Mon Apr 30, 2018 2:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: lecture on Monday
Replies: 1
Views: 66

lecture on Monday

from the lecture, the professor was discussing each electron configuration of each element. I was confused on way scandium starts from 3d^1. I know that its in the d block however why does it start with a d 3.
by Mohamad Farhat 1L
Sun Apr 29, 2018 7:04 pm
Forum: DeBroglie Equation
Topic: Calculating velocity
Replies: 5
Views: 225

Re: Calculating velocity

typically you would use the debroglie equation. You would have wavelength = h over m times v. you would switch v and wavelength and solve for v.
by Mohamad Farhat 1L
Thu Apr 26, 2018 11:59 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Constant [ENDORSED]
Replies: 6
Views: 230

Re: Rydberg Constant [ENDORSED]

on the cover page of the first exam, it is listed as 3.29 x 10^15 hz. so I'm assuming we use that one.
by Mohamad Farhat 1L
Sun Apr 22, 2018 9:32 pm
Forum: Properties of Light
Topic: week 3 discussion, question 11
Replies: 2
Views: 91

Re: week 3 discussion, question 11

He developed a method of measuring the minute electric charge that is present on many of the droplets in an oil mist. Millikan was able to measure both the amount of electric force and magnitude of electric field on the tiny charge of an isolated oil droplet.
by Mohamad Farhat 1L
Sun Apr 22, 2018 8:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013849

Re: Post All Chemistry Jokes Here

they say 70% of you is h2o, well the other 30% of me wants2die.
by Mohamad Farhat 1L
Sun Apr 22, 2018 8:41 pm
Forum: *Black Body Radiation
Topic: Black Body? [ENDORSED]
Replies: 13
Views: 1208

Re: Black Body? [ENDORSED]

I had a similar question to this one. I was curious how when wearing a black shirt on a hot day absorbs more heat.
by Mohamad Farhat 1L
Sun Apr 15, 2018 11:19 pm
Forum: Photoelectric Effect
Topic: Quanta vs. Photon [ENDORSED]
Replies: 3
Views: 151

Re: Quanta vs. Photon [ENDORSED]

A photon has the properties of wave like. And a photo Dosent.

Quantum can be described as a measure of quantity, but a photon is not about a measure of quantity.
by Mohamad Farhat 1L
Sun Apr 15, 2018 11:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units - L or mL? [ENDORSED]
Replies: 15
Views: 603

Re: Units - L or mL? [ENDORSED]

It just depends on what they are asking for. Usually it is in L. But if it is in ml then switch to L.
by Mohamad Farhat 1L
Sun Apr 15, 2018 11:05 pm
Forum: Balancing Chemical Reactions
Topic: Suggestions for Balancing Reactions
Replies: 8
Views: 369

Re: Suggestions for Balancing Reactions

For me the best way to balance equations is writing each element on the side and counting it. Take one step at a time looking at the one which looks the simplest.
To make sure that the equations balanced I just count each element again to reassure.
by Mohamad Farhat 1L
Sun Apr 08, 2018 11:50 pm
Forum: Ionic & Covalent Bonds
Topic: Types of Bonds
Replies: 10
Views: 376

Re: Types of Bonds

the last comment is right. But it may be more difficult to figure it out on an exam.
by Mohamad Farhat 1L
Sun Apr 08, 2018 11:35 pm
Forum: Limiting Reactant Calculations
Topic: Reactant vs. Reagent [ENDORSED]
Replies: 23
Views: 9496

Re: Reactant vs. Reagent [ENDORSED]

A reagent in a chemical reaction facilitates the chemical reaction and a reactant is a substance that is directly involved in a chemical reaction.
by Mohamad Farhat 1L
Sun Apr 08, 2018 10:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 5
Views: 212

Re: Modules

The modules are very helpful to understand some of the concepts. The questions are more difficult however once you breaking down the questions they are beneficial.
by Mohamad Farhat 1L
Sun Apr 08, 2018 10:33 pm
Forum: Empirical & Molecular Formulas
Topic: Periodic Table Memorization [ENDORSED]
Replies: 8
Views: 398

Re: Periodic Table Memorization [ENDORSED]

its always good to have them memorized or at least be familiar with elements therefore when you see it on an exam you are able to know what it is.
by Mohamad Farhat 1L
Sun Apr 08, 2018 10:30 pm
Forum: Significant Figures
Topic: Why are sig figs important?
Replies: 13
Views: 1352

Re: Why are sig figs important?

I think sig figs are important when it comes down to math measurements.
by Mohamad Farhat 1L
Sun Apr 08, 2018 4:31 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 166
Views: 100748

Re: Rusty on High School Chem [ENDORSED]

I am taking this Chem 14a this quarter. I took honors Chem which seems very familiar. however I forgot many of the concepts. The best way to refresh your mind is watch videos such as khan academy or on youtube. Working through the math problems is the best way to understand it. If you don't understa...

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