Search found 22 matches
- Sun Dec 10, 2017 2:45 pm
- Forum: Lewis Acids & Bases
- Topic: the importance of protonation
- Replies: 2
- Views: 400
Re: the importance of protonation
Protonation is the addition of a proton to a molecule, so the molecule would be a base. Conversely, deprotonation occurs to bronsted acids that donate their proton to a base.
- Sun Dec 10, 2017 2:42 pm
- Forum: Octet Exceptions
- Topic: Exceptions [ENDORSED]
- Replies: 7
- Views: 1239
Re: Exceptions [ENDORSED]
Octet exceptions can occur when the element is from the third period and beyond because of the accessible d orbitals.
- Sun Dec 10, 2017 2:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2759366
Re: Post All Chemistry Jokes Here
Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel.
Cheers! We outta chem 14A.
A: A ferrous wheel.
Cheers! We outta chem 14A.
- Fri Dec 08, 2017 10:58 am
- Forum: Bronsted Acids & Bases
- Topic: Neutralization reactions
- Replies: 2
- Views: 447
Re: Neutralization reactions
When a base and an acid react together to form a salt and a water, it is a neutralization reaction and the pH is driven towards 1.0E-7. The H+ of the acid and the OH- of the salt form water whereas their counterparts form the salt. Hope this helps!
- Fri Dec 08, 2017 10:49 am
- Forum: Lewis Acids & Bases
- Topic: Ethylamine vs. Methylamine
- Replies: 1
- Views: 1824
Ethylamine vs. Methylamine
Why is Ethylamine a stronger base than methylamine? I mean beyond the reason of a lower pKb. Why does Ethylamine have a lower pKb?
- Wed Nov 29, 2017 11:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square planar vs Tetrahedral
- Replies: 2
- Views: 451
Re: Square planar vs Tetrahedral
A square planar molecule has the molecule notation of AX4E2 where tetrahedral has the molecule notation of AX4. In other words, a square planar molecule has 2 pairs of free electrons.
- Wed Nov 29, 2017 11:33 pm
- Forum: Conjugate Acids & Bases
- Topic: Chemical Formula
- Replies: 5
- Views: 718
Re: Chemical Formula
If the molecule is made with a metal element, then it's a base. If the molecules is made a nonmetal element, it's an acid. You can also see if there are Hydronium ions being produced or hydroxide ions being produced.
- Wed Nov 29, 2017 11:29 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Weaks vs. Strong acids
- Replies: 3
- Views: 633
Re: Weaks vs. Strong acids
If you are asking how we know, there is a tendency for acids made with elements on the far right side of the periodic table to be strong acids because of their high electronegativity. But we know them mostly from memorizing them!
- Wed Nov 29, 2017 11:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Square Planar
- Replies: 3
- Views: 467
Re: Square Planar
They are 90 degrees or 180 degrees.
- Wed Nov 29, 2017 11:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: From the Post-Module Assessment 1A:
- Replies: 3
- Views: 414
Re: From the Post-Module Assessment 1A:
To be honest I am not too sure about this exactly but from my understanding there is not much of a difference between the first two things that you quoted. I am not exactly sure about the third.
- Tue Nov 14, 2017 11:29 pm
- Forum: Hybridization
- Topic: Purpose of hybridization [ENDORSED]
- Replies: 5
- Views: 5663
Re: Purpose of hybridization [ENDORSED]
The purpose of hybridization is to see the types of bonds that the atoms share with each other, whether it be sigma or pi bonds. The different types of bonds allow different properties, like how pi bonds do not allow rotation whereas sigma bonds are rotational.
- Tue Nov 14, 2017 11:26 pm
- Forum: Hybridization
- Topic: Diapole
- Replies: 4
- Views: 707
Re: Diapole
Dipole moments occur in covalent bonds where electrons are not shared equally. The difference in electronegativity creates a charge difference and dipole moments is the measure of this charge difference. A dipole moment is the charge times the distance between the atoms.
- Mon Nov 06, 2017 12:23 am
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 10
- Views: 1054
Re: Lewis Structures
If the question asks for resonance structures you should draw all of them. We only drew 3 because those molecules only had 3 resonance structures. I hope this helped!
- Mon Nov 06, 2017 12:10 am
- Forum: Lewis Structures
- Topic: When to use a double bond or triple bond [ENDORSED]
- Replies: 6
- Views: 47335
Re: When to use a double bond or triple bond [ENDORSED]
It depends on the context! Priority wise you would want to use double bonds to match the number of electrons with the total amount you are supposed to have. Then comes the necessity to have formal charges of zero for each atom. Hope this helps!
- Fri Oct 27, 2017 1:46 am
- Forum: Ionic & Covalent Bonds
- Topic: Cations and Anions [ENDORSED]
- Replies: 12
- Views: 2046
Re: Cations and Anions [ENDORSED]
Cations are atoms or molecules with a total positive charge (usually through losing electrons), while an anions are those with a total negative charge (usually through losing electrons).
- Fri Oct 27, 2017 1:41 am
- Forum: Ionic & Covalent Bonds
- Topic: Chemical formula?
- Replies: 5
- Views: 683
Re: Chemical formula?
The chemical formula of compounds can be created using rules that can be generalized used on patterns. These rules can be found in the fundamentals part of the textbook (section D). The two things you ask of, however, are cations and perhaps you mean to ask how to find the charges for them. For tran...
- Fri Oct 20, 2017 2:49 am
- Forum: Photoelectric Effect
- Topic: Rydberg
- Replies: 11
- Views: 1621
Re: Rydberg
n(initial)-n(final) gives me a negative frequency. Is this right? You should get a negative number because you are going from a higher energy state to a lower energy state. Quantitatively, you would be subtracting a not as negative number from a negative number. The negative result from this indica...
- Fri Oct 20, 2017 2:44 am
- Forum: Photoelectric Effect
- Topic: Energy of Photon [ENDORSED]
- Replies: 9
- Views: 2402
Re: Energy of Photon [ENDORSED]
If the energy of the photon is exactly equal to threshold energy, or "the energy [required] to remove an electron" as you put it, then the electron is ejected. However, because all of the energy was consumed as work, there is no more energy to translate into kinetic energy, thus the veloci...
- Fri Oct 13, 2017 2:21 am
- Forum: Properties of Light
- Topic: Question 1.9
- Replies: 3
- Views: 493
Re: Question 1.9
Hello Michael,
You are absolutely correct. However, microwaves are not one specific wavelength but rather a range from 1m to 1mm. I hope this answered your question~
You are absolutely correct. However, microwaves are not one specific wavelength but rather a range from 1m to 1mm. I hope this answered your question~
- Fri Oct 13, 2017 2:12 am
- Forum: Properties of Light
- Topic: Relationship between the frequency of electromagnetic radiation and electrical field
- Replies: 2
- Views: 463
Re: Relationship between the frequency of electromagnetic radiation and electrical field
I am not too sure, but I will try to explain with my reasoning. If the frequency decreases, then the wave broadens which is correlated to the smaller amplitude and thus less intensity. Because less photons are hitting the metal, then less e- are ejected creating a smaller potential difference in the...
- Fri Oct 06, 2017 11:48 am
- Forum: SI Units, Unit Conversions
- Topic: Derived Units
- Replies: 4
- Views: 681
Re: Derived Units
I think I remember Dr. Lavelle saying although it is good to use dimensional analysis of units to check if we were doing the problem correct and arriving at the correct units of measurement, it is not necessary as long as the final units of measurement are correct (assumed to be in SI units).
- Fri Oct 06, 2017 11:38 am
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Calculations [ENDORSED]
- Replies: 3
- Views: 1566
Re: Limiting Reactant Calculations [ENDORSED]
Yeah it seems like you know the general direction to go! You would first find the molar mass of NH3 and the molar mass of O2. Then use the MM you calculated to find the number of moles of each respective reactant. Then, pick a reactant and calculate the needed amount of the other using the ratio fro...