Search found 40 matches
- Wed Jun 13, 2018 8:09 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: ligands?
- Replies: 3
- Views: 676
ligands?
do we have to memorize ligands?
- Wed Jun 13, 2018 4:38 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 2
- Views: 486
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
- Wed Jun 13, 2018 4:34 pm
- Forum: Resonance Structures
- Topic: Radicals
- Replies: 1
- Views: 366
Re: Radicals
yes by the central atom
such as ch3
.
h -c-h
|
h
such as ch3
.
h -c-h
|
h
- Wed Jun 13, 2018 4:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation Number
- Replies: 1
- Views: 425
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
Ionic charge >3+, 3-
Charge on an atom inside a compound
Oxidation number >+3, -3
Re: Naming
I believe it is 72°, 90°
- Sun Jun 10, 2018 10:58 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: final [ENDORSED]
- Replies: 4
- Views: 904
final [ENDORSED]
do we need to know molecular orbital theory, bond order etc for the exam?
- Sun Jun 10, 2018 10:56 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pOH
- Replies: 5
- Views: 919
Re: pOH
I believe so we do.
- Sat Jun 09, 2018 5:39 pm
- Forum: Lewis Acids & Bases
- Topic: Final Layout
- Replies: 2
- Views: 425
Re: Final Layout
the final is evenly distributed throughout the whole course. Each chapter will have problems on the exam
- Fri Jun 08, 2018 3:04 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Solubility and Polarity
- Replies: 3
- Views: 771
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.
- Sat Jun 02, 2018 5:28 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand and coordination sphere
- Replies: 2
- Views: 452
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.
- Sat Jun 02, 2018 5:22 pm
- Forum: Sigma & Pi Bonds
- Topic: Detail of Bonds
- Replies: 3
- Views: 615
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
1 double bond = 1 sigma bond + 1 pi bond
1 triple bond = 1 sigma bond + 2 pi bonds
- Sat Jun 02, 2018 5:20 pm
- Forum: Electronegativity
- Topic: Test 3. Question 7.
- Replies: 6
- Views: 1081
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
3.16-1.00 3.16-1.31
2.16 en. 1.85 en
cacl2 has greater ionic character
- Sat Jun 02, 2018 5:16 pm
- Forum: Bond Lengths & Energies
- Topic: Test 3 Q 8 [ENDORSED]
- Replies: 9
- Views: 1400
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
- Thu May 24, 2018 6:36 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar Vs. Non-Polar
- Replies: 7
- Views: 1402
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...
- Wed May 23, 2018 4:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: shape of water
- Replies: 8
- Views: 1212
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.
- Mon May 14, 2018 2:15 pm
- Forum: Lewis Structures
- Topic: in class example bf^3 [ENDORSED]
- Replies: 2
- Views: 493
in class example bf^3 [ENDORSED]
why does it only have 6 valence electrons? I didn't understand it clearly.
- Thu May 10, 2018 2:08 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Homework Question 2.41
- Replies: 3
- Views: 631
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.
but generally n= the number. to get l it is n-1. to get ml it is -l to l values.
- Wed May 09, 2018 5:03 pm
- Forum: Trends in The Periodic Table
- Topic: question
- Replies: 6
- Views: 805
question
what is the difference between electron affinity and electronegativity?
- Tue May 08, 2018 4:43 pm
- Forum: Trends in The Periodic Table
- Topic: question confused
- Replies: 2
- Views: 462
Re: question confused
thank you!
- Tue May 08, 2018 11:22 am
- Forum: Trends in The Periodic Table
- Topic: question confused
- Replies: 2
- Views: 462
question confused
how can we determine 1st round of ionization compared to 2nd round of ionization energy?
- Sun May 06, 2018 10:24 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: test 1
- Replies: 1
- Views: 399
test 1
is their a way we can see the final answers of quiz 1?
- Thu May 03, 2018 12:59 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Lewis Structure [ENDORSED]
- Replies: 7
- Views: 967
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.
- Wed May 02, 2018 6:40 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: valence electrons question
- Replies: 2
- Views: 455
valence electrons question
which element can have valence electrons with the quantum numbers:
a)n= 2, l=1
can someone explains this throughly.
a)n= 2, l=1
can someone explains this throughly.
- Tue May 01, 2018 6:28 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: question on a problem
- Replies: 1
- Views: 309
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?
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?
- Tue May 01, 2018 5:26 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shells?
- Replies: 7
- Views: 947
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.
- Mon Apr 30, 2018 2:22 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: lecture on Monday
- Replies: 1
- Views: 153
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.
- Sun Apr 29, 2018 7:04 pm
- Forum: DeBroglie Equation
- Topic: Calculating velocity
- Replies: 5
- Views: 612
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.
- Thu Apr 26, 2018 11:59 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Constant [ENDORSED]
- Replies: 6
- Views: 947
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.
- Sun Apr 22, 2018 9:32 pm
- Forum: Properties of Light
- Topic: week 3 discussion, question 11
- Replies: 2
- Views: 314
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.
- Sun Apr 22, 2018 8:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3966415
Re: Post All Chemistry Jokes Here
they say 70% of you is h2o, well the other 30% of me wants2die.
- Sun Apr 22, 2018 8:41 pm
- Forum: *Black Body Radiation
- Topic: Black Body? [ENDORSED]
- Replies: 13
- Views: 2170
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.
- Sun Apr 15, 2018 11:19 pm
- Forum: Photoelectric Effect
- Topic: Quanta vs. Photon [ENDORSED]
- Replies: 3
- Views: 652
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.
Quantum can be described as a measure of quantity, but a photon is not about a measure of quantity.
- Sun Apr 15, 2018 11:09 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Units - L or mL? [ENDORSED]
- Replies: 15
- Views: 4801
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.
- Sun Apr 15, 2018 11:05 pm
- Forum: Balancing Chemical Reactions
- Topic: Suggestions for Balancing Reactions
- Replies: 8
- Views: 1025
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.
To make sure that the equations balanced I just count each element again to reassure.
- Sun Apr 08, 2018 11:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Types of Bonds
- Replies: 10
- Views: 1278
Re: Types of Bonds
the last comment is right. But it may be more difficult to figure it out on an exam.
- Sun Apr 08, 2018 11:35 pm
- Forum: Limiting Reactant Calculations
- Topic: Reactant vs. Reagent [ENDORSED]
- Replies: 23
- Views: 34904
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.
- Sun Apr 08, 2018 10:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Modules
- Replies: 5
- Views: 683
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.
- Sun Apr 08, 2018 10:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: Periodic Table Memorization [ENDORSED]
- Replies: 8
- Views: 869
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.
- Sun Apr 08, 2018 10:30 pm
- Forum: Significant Figures
- Topic: Why are sig figs important?
- Replies: 13
- Views: 16250
Re: Why are sig figs important?
I think sig figs are important when it comes down to math measurements.
- Sun Apr 08, 2018 4:31 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 477226
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...