Search found 30 matches
- Thu Dec 06, 2018 7:21 pm
- Forum: Naming
- Topic: oxidation number
- Replies: 4
- Views: 486
Re: oxidation number
A formula used in the textbook is (# metal atoms)(oxidation number of the metal)+(# of each ligand)(charge of each ligand)=charge of the ion, let x be the oxidation number to be determined.
- Thu Dec 06, 2018 7:13 pm
- Forum: Bronsted Acids & Bases
- Topic: How to tell if it is an acid or base?
- Replies: 4
- Views: 17135
How to tell if it is an acid or base?
The 7th edition textbook problem Fundamental J 1, identify which is a Bronsted Acid or Base: NH3, HBR, KOH, H2SO3, Ca(OH)2. How do we know which one is a Bronsted acid or base?
- Thu Dec 06, 2018 7:01 pm
- Forum: Bronsted Acids & Bases
- Topic: Identifying the difference
- Replies: 6
- Views: 637
Re: Identifying the difference
Bronsted Acids is a proton donor, while Bronsted Bases is a proton acceptor. On the other hand, Lewis bases is a electron donor while Lewis acids accept electrons.
- Wed Nov 28, 2018 5:25 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis acid and base
- Replies: 5
- Views: 482
Re: Lewis acid and base
When given an example we would probably need to identify if it is an acid or base like in lecture he told us BF3 and H+ are lewis acids. But that can be found with basic information about acid and bases.
- Wed Nov 28, 2018 5:23 pm
- Forum: Bronsted Acids & Bases
- Topic: bronstead vs lewis
- Replies: 2
- Views: 441
Re: bronstead vs lewis
I agree, to summarize the bronsted acid/base are used for protons as either a donor or acceptor. Lewis acid/bases are used for electrons as either a donor or acceptor.
Naming
When naming a coordination compound, how do we find the roman numeral used? Like in the example in class: Cobalt (II)
- Tue Nov 20, 2018 2:23 pm
- Forum: Hybridization
- Topic: Bond Angles
- Replies: 4
- Views: 459
Re: Bond Angles
I agree with the comments, drawing the the molecular shape is the best way of figuring out the bond angle. It is also a good idea to think of the model in 3D so that the bond angles are easy to figure out.
- Tue Nov 20, 2018 2:04 pm
- Forum: Hybridization
- Topic: Molecular Shape & Hybridization
- Replies: 4
- Views: 356
Re: Molecular Shape & Hybridization
I agree, whenever there is electron density there should be Hybridization. Making each molecular geometry having electron density.
- Tue Nov 20, 2018 1:59 pm
- Forum: Hybridization
- Topic: Pi and Sigma Bonds
- Replies: 4
- Views: 470
Re: Pi and Sigma Bonds
Also, Pi bonds are present with bonds greater than single bonds. Sigma bonds are present in single bonds and also double and triple bonds.
- Wed Nov 14, 2018 11:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 366
Re: Molecular Shape
Like the previous comments said it is due to the angles formed by the structure. It is sometimes easier to think of the structure in 3D, the octahedral structure becomes more apparent.
- Wed Nov 14, 2018 11:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing structures
- Replies: 4
- Views: 388
Re: Drawing structures
I agree with the other replies, just to add the lone pair would cause the structure to be Trigonal Pyramidal. When looking at the structure in 3D we can see that the structure looks different than the Tetrahedral structure due to the lone pair.
- Wed Nov 14, 2018 11:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Bond Angles
- Replies: 1
- Views: 231
Determining Bond Angles
In Lecture sometimes we would divide the number of bonds by 360, but sometimes that does not work. I was wondering if we have to memorize the association between bond angles and their geometry or is there some other way to determine bond angles?
- Wed Nov 07, 2018 8:38 pm
- Forum: Bond Lengths & Energies
- Topic: Triple Bonds Shorter than Double Bonds
- Replies: 4
- Views: 3201
Re: Triple Bonds Shorter than Double Bonds
I agree, and to add triple bonds are shorter than double bonds due to the pull from the nucleus. Double bonds have a longer bond length due to the large distance and have a weaker pull.
- Wed Nov 07, 2018 8:34 pm
- Forum: Bond Lengths & Energies
- Topic: Interaction Potential Energy equation
- Replies: 2
- Views: 376
Interaction Potential Energy equation
Just reading over the notes and wondering how to use the Interaction potential energy equation, how do you find the polarizability and distance.
- Wed Nov 07, 2018 8:31 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 6
- Views: 578
Re: Bond Lengths
To expand on what others have said, another way to determine bond lengths is if it is a larger atom there is a larger distance causing it to have a weak bond but longer bond length.
- Wed Oct 31, 2018 6:37 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 7255
Re: Formal charge purpose
I agree with the responses, the goal is to get the formal charge to a minimum amount or 0. This is when the structure is most stable.
- Wed Oct 31, 2018 6:29 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 928
Re: Central Atom
As most people said, to find the central atom is the lowest ionization energy. Carbon would be the central atom since Hydrogen is never the central atom.
- Wed Oct 31, 2018 4:42 pm
- Forum: Lewis Structures
- Topic: Periodic Table Trends
- Replies: 2
- Views: 242
Periodic Table Trends
For Lewis Structures it is important to know the ionization energies on the periodic table. I was wondering if someone could explain the important periodic table trends (like ionization energy) needed to create a Lewis structure.
- Wed Oct 24, 2018 10:02 pm
- Forum: Einstein Equation
- Topic: λ=h/p vs λ=hc/E
- Replies: 6
- Views: 3848
Re: λ=h/p vs λ=hc/E
As the previous replies said, λ=h/p debroglie wave equation when the momentum or (m*v) is given. λ=hc/E is used when Energy (J) is given.
- Wed Oct 24, 2018 9:59 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Value of Delta X
- Replies: 9
- Views: 1109
Re: Value of Delta X
I agree with the previous replies, delta x is usually in meters (m). Delta x describes the position, sometimes the problem gives it as a radius which is the same thing as the position.
- Wed Oct 24, 2018 9:53 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Calculate orbitals and subshells
- Replies: 3
- Views: 272
Re: Calculate orbitals and subshells
I agree with the previous comment, do not forget that it starts with 0. So the S-orbital would be 0, P-orbital would be 1, D-orbital would be 2, and the F-orbital would be 3.
- Thu Oct 18, 2018 11:14 am
- Forum: Einstein Equation
- Topic: Numbers to memorize [ENDORSED]
- Replies: 37
- Views: 4247
Re: Numbers to memorize [ENDORSED]
I agree with the replies most of the equations and constants are given on the sheet. It was recommended that we memorize the constants and the basic equations to go through the test faster.
- Thu Oct 18, 2018 11:09 am
- Forum: Properties of Electrons
- Topic: Rydberg formula
- Replies: 5
- Views: 467
Re: Rydberg formula
I agree with the previous replies, just plug in n=4 and n=2 to find the energy at each level. subtract the final and initial energy and plug in to find wavelength.
- Thu Oct 18, 2018 10:59 am
- Forum: Properties of Light
- Topic: Sig Figs in Problem 1.13 (6th Edition)
- Replies: 5
- Views: 472
Re: Sig Figs in Problem 1.13 (6th Edition)
I agree with the other replies, don't worry too much on the significant figures on that problem. In most cases you should go to the lowest significant figure, but in that problem I would just go with three significant figures.
- Thu Oct 11, 2018 2:42 pm
- Forum: Einstein Equation
- Topic: Units
- Replies: 5
- Views: 1040
Re: Units
Frequency is represented by Hz (or 1/s) when doing the calculations the h units cancel with the seconds and J is left. Which shows the units for energy is J, as said before in the other replies.
- Thu Oct 11, 2018 2:37 pm
- Forum: Einstein Equation
- Topic: Units for v(frequency)
- Replies: 11
- Views: 1259
Units for v(frequency)
Was doing the homework and noticed that for some of the problems they would use s^-1, while in others they would use Hz. Does it matter what units we use for frequency? or should they match with the rest of the calculations by using s^-1.
- Thu Oct 11, 2018 2:27 pm
- Forum: Properties of Light
- Topic: Wavelength
- Replies: 10
- Views: 514
Re: Wavelength
As everyone has said it is important to keep units in the calculation. It is important for the answer, but also for me personally it is easier to understand the equations used by seeing the units in the problem. SI units should be used during the calculations and then convert at the very end (if spe...
- Fri Oct 05, 2018 12:38 am
- Forum: Balancing Chemical Reactions
- Topic: Mole Coefficients in Chemical Equations
- Replies: 6
- Views: 744
Re: Mole Coefficients in Chemical Equations
It is true that the moles coefficients are not "equal" on both sides. But, the process of balancing the equation is trying to make sure the atoms/elements are the same.
- Fri Oct 05, 2018 12:23 am
- Forum: Empirical & Molecular Formulas
- Topic: Rounding in Mole Ratios for Empirical Formulas
- Replies: 2
- Views: 1336
Re: Rounding in Mole Ratios for Empirical Formulas
I agree with Ethan, making the decimal points easy to work with can make the multiplication easier. I usually find a number that satisfies most of the ratios and try to round off near the end.
- Thu Oct 04, 2018 5:44 pm
- Forum: Significant Figures
- Topic: SIG FIGS in ratios
- Replies: 4
- Views: 2355
Re: SIG FIGS in ratios
I agree with Krisdylle, it would be most helpful to use significant figures in calculations. Applying significant figures to the ratios will probably not change the answer significantly. The ratios in the problem should eventually be in whole numbers so using significant figures would probably help ...