Search found 35 matches
- Wed Dec 05, 2018 11:09 am
- Forum: Naming
- Topic: Anionic ligands
- Replies: 5
- Views: 578
Re: Anionic ligands
We use this for naming coordinate compounds. This is correct as it is the new version, but both versions can be used.
- Wed Dec 05, 2018 11:07 am
- Forum: Naming
- Topic: naming differences
- Replies: 6
- Views: 603
Re: naming differences
The difference between chloro and chlorido is that one is the new accepted suffix. Both do mean technically the same thing, its just one is more recent than the other.
- Wed Dec 05, 2018 11:03 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric clarification
- Replies: 5
- Views: 522
Re: Amphoteric clarification
Yes. One amphoteric molecule could be H20 but that still can't act both as a base or acid. It depends whether the other molecule reacting with water is more basic or acidic.
- Wed Dec 05, 2018 11:01 am
- Forum: Bronsted Acids & Bases
- Topic: How to identify Acids/Bases
- Replies: 4
- Views: 573
Re: How to identify Acids/Bases
Based on whether the molecule or atom gives off or wants to gain a H plus can help you determine whether it is more acidic or basic. Also if you think about the conjugate base or acid, and its relative strengths, that can help too.
- Wed Dec 05, 2018 10:59 am
- Forum: Naming
- Topic: Transition Metal
- Replies: 4
- Views: 437
Re: Transition Metal
I think that for our purpose we can only be working with one transitional metal because we are working on the ligands attached to one TM .
- Wed Dec 05, 2018 10:53 am
- Forum: Bronsted Acids & Bases
- Topic: Ka Formula
- Replies: 6
- Views: 888
Re: Ka Formula
You should probably know the formula just to understand that higher concentration in the forward reaction(in products) will lead to a higher Ka, meaning a stronger acid, lower ph.
- Wed Dec 05, 2018 10:49 am
- Forum: Lewis Acids & Bases
- Topic: Resonance in acids
- Replies: 3
- Views: 413
Re: Resonance in acids
If there is resonance than this increases the stability of the molecule. Therefore, due to resonance and delocalization of the electrons, the more readily the molecule will give off H+ and be a stronger acid.
- Wed Dec 05, 2018 10:47 am
- Forum: Lewis Acids & Bases
- Topic: Resonance Structures
- Replies: 4
- Views: 467
Re: Resonance Structures
If the acidic structure has resonance that means that it is usually stronger because it is able to find the most stable form of that molecule due to delocalization and readily give off H+.
- Fri Nov 30, 2018 11:28 am
- Forum: Electronegativity
- Topic: 7th Edition 3F.15
- Replies: 4
- Views: 2822
Re: 7th Edition 3F.15
The dipole moments in AsF5 cancel out whereas there is a lone pair in AsF3 creating polarity. Higher polarity and more imf due to this would create a higher boiling point.
- Fri Nov 30, 2018 11:26 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square Planar
- Replies: 12
- Views: 1936
Re: Square Planar
Yes the angles would just be 90 due it having the vsepr formula AX4E2 and the molecular arrangement with the electrons opposite from each other, and therefore somewhat cancelling the repulsion related by the other.
- Fri Nov 30, 2018 11:20 am
- Forum: Lewis Acids & Bases
- Topic: Lewis acid and base
- Replies: 5
- Views: 458
Re: Lewis acid and base
We need to know how they relate to coordinate atoms, how they are electron pair donors or acceptors, and examples of some common ones.
- Fri Nov 23, 2018 4:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 7
- Views: 742
Re: Polarity
Dipole moments are basically when the atoms that are drawn have differences in electronegativity. If you want to see if a molecule is polar, look at the overall structure. Sometimes there could be polar bonds but the structure's dipole moments could cancel each other out, and therefore be nonpolar.
- Fri Nov 23, 2018 4:52 pm
- Forum: Hybridization
- Topic: when to use hybridization
- Replies: 4
- Views: 399
Re: when to use hybridization
If the question asks what is the hybridization of the overall molecule or the specific atom, then you would be required to use hybridization.
- Fri Nov 23, 2018 4:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing Structures on Test
- Replies: 11
- Views: 942
Re: Drawing Structures on Test
No, as long as you have the basic structure down and don't add things that don't need to be there you should be fine.
- Wed Nov 14, 2018 9:22 pm
- Forum: Lewis Structures
- Topic: Boron Trifluoride
- Replies: 8
- Views: 794
Re: Boron Trifluoride
Boron is one of the examples of elements that can have expanded octects. Also those that are 2p and lower can have expanded octects.
- Wed Nov 14, 2018 9:21 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 9
- Views: 1076
Re: Bond Length
It would be the average of the lengths given for the resonance structures.
- Wed Nov 14, 2018 9:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 8
- Views: 1374
Re: Bond Angles
I think for most of them you just have to memorize it for the fastest way on an exam. However it will help to realize that when there are lone pairs, that will affect the bond angles. For exme, if there are four areas of electron densities, but one of them is occupied by lone pirs, and sy the shape ...
- Wed Nov 07, 2018 12:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chemical formula from compound name
- Replies: 2
- Views: 426
Re: Chemical formula from compound name
When you have Roman numerals it means you’re dealing with transitional metals. You are denoting the charge of that transitional metal.
- Wed Nov 07, 2018 12:16 pm
- Forum: Properties of Light
- Topic: Exam 2 Question 4A
- Replies: 6
- Views: 839
Re: Exam 2 Question 4A
You have to use e=hv as thst is the energy of the photon. Since you have the energy already you just have to solve for frequency as h is already given.
- Wed Nov 07, 2018 12:14 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 936
Re: Formal Charge
There are some instantances where formal charge does not equal zero. It would be preferable if the central atom has one of zero, but if it isn’t and you made sure that you have drawn the Lewis structure with the lowest energy,and you still have a formal charge of negative one, then it can happen
- Thu Nov 01, 2018 12:33 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal CHarge
- Replies: 5
- Views: 464
Re: Formal CHarge
It would be nice if the formal charges equal zero but sometimes it’s not so it would be the lowest amount for the formal charge.
- Thu Nov 01, 2018 12:28 am
- Forum: General Science Questions
- Topic: Calculator for midterm
- Replies: 4
- Views: 522
Re: Calculator for midterm
I would ask your ra they usually know where you can rent them out
- Thu Nov 01, 2018 12:27 am
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 853
Re: Central Atom
You look for which one of the elements have lower ionization energies. Also you can usually rule out hydrogen as it tends to never be in the middle. Ionization energy increases across and period and decreases as you go down a group
- Mon Oct 22, 2018 11:11 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number
- Replies: 3
- Views: 457
Re: Magnetic Quantum Number
With magnetic quantum number you can know more about the orbitals within the subshells.
- Mon Oct 22, 2018 11:10 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Formula confusion
- Replies: 5
- Views: 325
Re: Formula confusion
I used h as the same value for both questions-and it worked. Just make sure you use h/4pi instead of h/2pi instead of the different value of h.
- Mon Oct 22, 2018 11:06 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Frequency Condition
- Replies: 2
- Views: 392
Re: Frequency Condition
You can use the second equation for sure. The second one is easier to use because it can help find the frequency or use a frequency you already found to use in the formula.
- Thu Oct 18, 2018 7:11 pm
- Forum: Properties of Light
- Topic: Wavelength and frequency proportions [ENDORSED]
- Replies: 5
- Views: 646
Re: Wavelength and frequency proportions [ENDORSED]
When wavelength gets bigger, the frequency decreases. If you look at the equation v=f(lambda) and we know that there is constant speed(at least in the same medium) then we know that if one increases, the other has to decrease. Therefore, it is an indirect relationship.
- Thu Oct 18, 2018 7:07 pm
- Forum: DeBroglie Equation
- Topic: wave property
- Replies: 4
- Views: 347
Re: wave property
Yeah photon's have zero mass and therefore you can't use that equation. Instead, you use the momentum to figure out the wavelength.
- Thu Oct 18, 2018 7:04 pm
- Forum: Photoelectric Effect
- Topic: units
- Replies: 12
- Views: 1067
Re: units
Unless specified always stick with meters. It's just easier in the long run especially when using a specific formula.
- Thu Oct 11, 2018 11:17 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: En= -hR/n^2
- Replies: 3
- Views: 188
Re: En= -hR/n^2
I think that there must be different equations because it shows on my notes that it works only for the H spectrum.
- Thu Oct 11, 2018 11:09 am
- Forum: Limiting Reactant Calculations
- Topic: How to determine the limiting reactant???? [ENDORSED]
- Replies: 8
- Views: 10817
Re: How to determine the limiting reactant???? [ENDORSED]
The way I calculate the limiting reactant is by first finding the amount of moles are in the reactants given. Once you find the moles, only convert one of them to the moles of the other reactant. For example, if you had a equation of 2h2+2o2----2h202 find the moles of h2 through o2 by multiplying th...
- Thu Oct 11, 2018 11:04 am
- Forum: Limiting Reactant Calculations
- Topic: Test 1
- Replies: 8
- Views: 1112
Re: Test 1
This test was just a review of the fundamentals of chemistry in high school. If you did the modules and understood some of the intermediate level questions of the textbooks you should be fine. There was no long step equations that you should worry about(I would still do them just to test where you a...
- Tue Oct 02, 2018 2:34 pm
- Forum: SI Units, Unit Conversions
- Topic: Audio-Visual Focus-Topics, Assessments & Surveys
- Replies: 16
- Views: 1516
Re: Audio-Visual Focus-Topics, Assessments & Surveys
Hi it says required on the website but I think the actual homework that is due is the seven problems. The modules will probably help greatly for the coming tests though.
- Tue Oct 02, 2018 2:27 pm
- Forum: Significant Figures
- Topic: Mass Percent Composition
- Replies: 4
- Views: 2630
Re: Mass Percent Composition
Hi yeah you just have to use the least amount of sig figs and I usually wait till the end to do so just because it’s less of a hassle doing it in between problems. However there are different rules between multiplying numbers and finding dog figs than if you were adding numbers which I would just re...
- Tue Oct 02, 2018 2:00 pm
- Forum: Empirical & Molecular Formulas
- Topic: Determining the Number of Atoms for the Empirical Formula
- Replies: 2
- Views: 219
Re: Determining the Number of Atoms for the Empirical Formula
Yeah if it’s very close to a whole number you don’t have to worry about it. 4.03 is close enough to 4!