Search found 32 matches

by Daniel Rivas 3L
Mon Dec 04, 2017 10:01 pm
Forum: Calculating the pH of Salt Solutions
Topic: Salt + Water?
Replies: 2
Views: 294

Salt + Water?

I want to make sure and ask in advance. When you mix an acid and a base, do you always get a salt and water as the products?
by Daniel Rivas 3L
Mon Dec 04, 2017 9:59 pm
Forum: Conjugate Acids & Bases
Topic: How to tell what the conjugate is easily?
Replies: 1
Views: 150

How to tell what the conjugate is easily?

While I was doing the homework I was having trouble identifying the conjugates for acids and bases. Then I noticed that the conjugate is the molecule that had its proton removed if it's an acid and the molecule that had a proton added if it's a base. Is this a quick way to tell conjugates all the ti...
by Daniel Rivas 3L
Mon Dec 04, 2017 9:55 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Are pH and pOH opposites?
Replies: 2
Views: 189

Are pH and pOH opposites?

I know that pH and pOH can be calculated if you know one or the other. And that you can subtract one from 14 to get the other for the same acid or base. So does this mean that they are opposites in that regard? Will there sometimes be situations where you can't find one even if you have the other?
by Daniel Rivas 3L
Tue Nov 28, 2017 4:26 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted and Lewis acid definitions?
Replies: 3
Views: 249

Bronsted and Lewis acid definitions?

So in high school I learned to call Bronsted and Lewis acids strong and weak acids respectively. Are they the same thing? Also what differentiates a Bronsted (strong) and Lewis (weak) acid?
by Daniel Rivas 3L
Tue Nov 28, 2017 4:20 pm
Forum: Sigma & Pi Bonds
Topic: When do Sigma and Pi bonds occur?
Replies: 4
Views: 327

When do Sigma and Pi bonds occur?

I am a little confused as to when sigma and pi bonds occur. I know that we always have a sigma bond first. But are pi bonds always after a sigma bond? Or do sigma bonds sometimes occur after another sigma bond? What differentiates them?
by Daniel Rivas 3L
Mon Nov 20, 2017 10:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Constant Calculation
Replies: 2
Views: 148

Constant Calculation

So as I noticed in lecture, when you are calculating the equilibrium constant for the opposite side of the equation, you can calculate it by taking the reciprocal of the constant of the first side. Is this always the case? Or was it only for the equation in lecture?
by Daniel Rivas 3L
Mon Nov 20, 2017 10:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction arrows
Replies: 3
Views: 203

Reaction arrows

So in all the chemical equilibrium equations, there is a double arrow symbol that points both ways of the equation. Does this mean that the reaction is happening both ways at the same time? For example, are the reactants turning into products and products turning into reactants at the same time? Or ...
by Daniel Rivas 3L
Thu Nov 16, 2017 2:16 pm
Forum: Hybridization
Topic: Polar/nonpolar [ENDORSED]
Replies: 14
Views: 1427

Re: Polar/nonpolar [ENDORSED]

Yeah basically of there is an unequal sharing of electrons, it it polar. If there isn't, it is nonpolar.
by Daniel Rivas 3L
Thu Nov 16, 2017 2:15 pm
Forum: Hybridization
Topic: Notation
Replies: 6
Views: 300

Re: Notation

When you are writing out the electron configuration of an element, you only need to know that notation to make it more precise. But really, you don't need to worry about it too much.
by Daniel Rivas 3L
Thu Nov 16, 2017 2:10 pm
Forum: Hybridization
Topic: What is a hybrid orbital?
Replies: 2
Views: 181

What is a hybrid orbital?

I am having trouble understanding what a hybrid orbital is and how it forms. I also don't understand the 4 equations given by the book.
by Daniel Rivas 3L
Thu Nov 16, 2017 2:05 pm
Forum: Hybridization
Topic: Difference between sigma and pi bonds?
Replies: 6
Views: 733

Difference between sigma and pi bonds?

I am a little confused on what the difference is and how each of them forms. Does it have to do with shape or with how the electrons interact when bonded?
by Daniel Rivas 3L
Mon Nov 06, 2017 10:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Xenon Tetrafluoride?
Replies: 4
Views: 415

Xenon Tetrafluoride?

So today in class Dr. Lavelle showed us the shape of a Xenon Tetrafluoride molecule. But how does this molecule exist? From what I understand, molecules with the noble gases can only be made in a lab so it isn't natural right? And I also think it doesn't last very long. Should I memorize what it is?
by Daniel Rivas 3L
Mon Nov 06, 2017 10:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hybridization of Central Atom? [ENDORSED]
Replies: 2
Views: 155

Hybridization of Central Atom? [ENDORSED]

I have been seeing this phrase a lot and I don't know what it means. Can someone explain what a hybridization of a central atom is?
by Daniel Rivas 3L
Mon Nov 06, 2017 10:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structures
Replies: 6
Views: 286

Re: Lewis Structures

I think it is an actual representation of it. I think we can see molecule shapes through electron microscopes or some other microscope.
by Daniel Rivas 3L
Mon Nov 06, 2017 10:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Spin Quantum Number [ENDORSED]
Replies: 12
Views: 826

Re: Electron Spin Quantum Number [ENDORSED]

It can be either 1/2 or -1/2.
by Daniel Rivas 3L
Thu Nov 02, 2017 4:17 pm
Forum: Lewis Structures
Topic: Lewis Structures for Ions?
Replies: 1
Views: 152

Lewis Structures for Ions?

One thing I struggle with is writing Lewis structures for Ions. So am I supposed to pretend like the central atom has extra electrons depending on the charge of the ion? And then write the charge of the ion on the outside of it? I think that's how you do it from what I have observed so far.
by Daniel Rivas 3L
Thu Nov 02, 2017 4:09 pm
Forum: Lewis Structures
Topic: electron configuration
Replies: 6
Views: 323

Re: electron configuration

I asked my TA about this. She says that either way is correct, but that Dr. Lavelle has a specific reason for listing off the 3d10 before the 4s2 and 4p6 orbitals. So yeah just do it the way Dr. Lavelle has been doing it.
by Daniel Rivas 3L
Thu Nov 02, 2017 4:06 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 3.11
Replies: 2
Views: 229

Re: Homework 3.11

Yeah that's the way you do it I think. And it also works the same way for 3.9. But 3.9 is easier since it asks for M^2+ ions and that means you put them in the s shell only.
by Daniel Rivas 3L
Thu Nov 02, 2017 4:01 pm
Forum: Ionic & Covalent Bonds
Topic: How to easily tell between Ionic and Covalent bonds?
Replies: 8
Views: 460

How to easily tell between Ionic and Covalent bonds?

When I was in high school, one easy way I learned to easily tell if a compound was ionic or covalent was the placements of the elements on the periodic table. For example if the elements were far apart from each other like sodium and chlorine, then they form the ionic compound sodium chloride. And i...
by Daniel Rivas 3L
Tue Oct 24, 2017 8:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: No f- orbital questions? [ENDORSED]
Replies: 4
Views: 293

No f- orbital questions? [ENDORSED]

I know that Dr. Lavelle said that we aren't going to be concerned with elements that have f- orbitals because many are radioactive. So does this mean that we don't have to worry about learning anything about their electron configuration? Or is there something we at least have to know?
by Daniel Rivas 3L
Tue Oct 24, 2017 8:42 pm
Forum: Trends in The Periodic Table
Topic: Are Trends always consistent?
Replies: 1
Views: 135

Are Trends always consistent?

I am wondering if trends in the periodic table are always consistent. I am wondering because I know from high school that even though reactivity tends to decrease as you go across the table, the halogens next to the noble gases are very reactive. And there are also many other examples where an eleme...
by Daniel Rivas 3L
Tue Oct 24, 2017 8:33 pm
Forum: Trends in The Periodic Table
Topic: Size of Atomic Radii
Replies: 3
Views: 244

Re: Size of Atomic Radii

I also like to think of the atomic radii of the elements gettting smaller as you go across because there are more electrons in the shells. This would make the atom of the elements as you go across want to get rid of their electrons less. Meanwhile the atoms of elements on the left of each row want t...
by Daniel Rivas 3L
Tue Oct 24, 2017 8:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Px, Py, Pz
Replies: 10
Views: 548

Re: Px, Py, Pz

Yeah I was wondering myself about this since he said it was more proper to write Px, Py, and Pz instead of like P3. But i guess it doesn't matter too much.
by Daniel Rivas 3L
Wed Oct 18, 2017 10:29 pm
Forum: *Shrodinger Equation
Topic: What is a node?
Replies: 5
Views: 348

What is a node?

One thing that is confusing me about the Schrodinger equation section is the node definition. What exactly is a node? And also what does it mean by the wavefunction passing 0?
by Daniel Rivas 3L
Wed Oct 18, 2017 10:27 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Equation
Replies: 7
Views: 378

Re: Heisenberg Uncertainty Equation

Yeah I was wondering about this too and though that maybe I was missing something important. But I guess it isn't something I can realize yet but maybe in the future I will.
by Daniel Rivas 3L
Wed Oct 18, 2017 10:24 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Questions that are due Friday?
Replies: 1
Views: 148

Questions that are due Friday?

So I want to do the homework for Friday and have noticed that Lavelle hasn't posted what sections of questions we can do for this Friday's homework. Is it just the questions that are covered in sections 1.6 and 1.7? Because that is all that Lavelle has covered in lecture.
by Daniel Rivas 3L
Wed Oct 18, 2017 10:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Schrodinger's Equation gives shape of orbitals?
Replies: 1
Views: 229

Schrodinger's Equation gives shape of orbitals?

So I was wondering about Schrodinger's equation after today's lecture. Does it tell us the shape of an orbital? Because the textbook says that Schrodinger's equation gives us the wave function for any particle. Or is there something I am missing?
by Daniel Rivas 3L
Thu Oct 12, 2017 5:16 pm
Forum: Properties of Light
Topic: Structure of Test #2? [ENDORSED]
Replies: 1
Views: 208

Structure of Test #2? [ENDORSED]

I was just wondering about how Test # 2 will be structured. Is it going to be the same as test #1? I am just wondering because I didn't do as well as I hoped on the first test and want to know if it will be structured the same way.
by Daniel Rivas 3L
Thu Oct 12, 2017 5:11 pm
Forum: *Black Body Radiation
Topic: Black Body? [ENDORSED]
Replies: 13
Views: 1212

Black Body? [ENDORSED]

I was just wondering if someone can explain what a black body is to me? Like is it just a thing that is extremely hot? And why is it called a black body if it is usually a glowing white object?
by Daniel Rivas 3L
Thu Oct 12, 2017 5:02 pm
Forum: Photoelectric Effect
Topic: Energy in kj or j when solving a problem?
Replies: 10
Views: 574

Re: Energy in kj or j when solving a problem?

If we have kg or km should we convert to g and m? I think it depends on the problem. Sometimes it asks you for specific units to end up with. In that case, you should leave it in the desired units the question asks for. However if the question doesn't ask, then I think you can leave it in whatever ...
by Daniel Rivas 3L
Fri Oct 06, 2017 12:43 am
Forum: Molarity, Solutions, Dilutions
Topic: Molarity unit [ENDORSED]
Replies: 11
Views: 802

Molarity unit [ENDORSED]

So I was working on a lot of molarity questions recently and I was wondering. does Molarity always have the unit of mol/L? Or can it sometimes equal mol/ml if you keep it the same? or is it a different unit altogether? I'm just a little confused about it.
by Daniel Rivas 3L
Mon Oct 02, 2017 4:48 pm
Forum: Empirical & Molecular Formulas
Topic: How to tell if Empirical and Molecular Formula are the same? [ENDORSED]
Replies: 2
Views: 267

How to tell if Empirical and Molecular Formula are the same? [ENDORSED]

So I have been wondering about this for a while. But is there an easy way to tell if the empirical and molecular formula of a substance are the same? I know some substances like water have the same empirical and molecular formula but is thre a way to easily know before you do the problem? I'm just c...

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