## Search found 30 matches

Thu Dec 06, 2018 7:21 pm
Forum: Naming
Topic: oxidation number
Replies: 4
Views: 150

### 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: 239

### 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: 200

### 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: 198

### 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
Replies: 2
Views: 222

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.
Wed Nov 28, 2018 5:14 pm
Forum: Naming
Topic: Naming
Replies: 1
Views: 89

### 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: 167

### 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: 166

### 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: 176

### 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: 155

### 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: 123

### 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: 96

### 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: 623

### 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: 139

### 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: 228

### 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: 2616

### 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: 348

### 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: 91

### 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: 863

### 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: 517

### 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: 144

### 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: 1733

### 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: 217

### 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: 196

### 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: 256

### 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: 293

### 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: 141

### 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: 493

### 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: 210

### 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: 605

### 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 ...