CHEMISTRY COMMUNITY

Gabriel Ordonez 2K

Can someone walk through a second order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?

Gabriel Ordonez 2K

Can someone walk through a first order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?

Gabriel Ordonez 2K

Can someone walk through a zero order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?

Gabriel Ordonez 2K

How do we solve for different state variables with given rates laws and values?

Gabriel Ordonez 2K

What are the different rate laws, their concepts, and types? What do we need to succeed in this class?

Gabriel Ordonez 2K

What are the primary conceptual and mathematical differences between kinetics and thermodynamics? Can you explain through example and application?

Gabriel Ordonez 2K

As also a student of LS 7A, I can see the connection between thermodynamics and biological application. But for the purposes of excelling in the course, what are the ideal chemical concepts that we need to know to ace the final?

Gabriel Ordonez 2K

What is the definition of the Third Law of Thermodynamics, its essential concepts, and primary applications?

Gabriel Ordonez 2K

What are example problems we'll encounter that could link together Gibbs Free Energy and Alternative Fuels? What are the main concepts needed to solve said problem?

Gabriel Ordonez 2K

What are the different, but essential, equations for gibbs free energy in thermodynamics? How can we manipulate the Gibbs Free energy equation with the R constant?

Gabriel Ordonez 2K

What are the different ways in which we can manipulate the equation? What are the primary applications of this formula?

Gabriel Ordonez 2K

How do rechargeable batteries differ from normal ones? Do said rechargeable batteries differ greatly in products like phones or vehicles?

Gabriel Ordonez 2K

What are the different ways in which we manipulate the Gibbs Free Energy Equation for Electrochemistry and/or combine/separate the equation with other appropriate equations for this unit? Can someone provide a list and example?

Gabriel Ordonez 2K

How do we solve for either the anode or cathode when we're given the K of either one and other necessary values to complete the question? Can someone provide an example of said case?

Gabriel Ordonez 2K

When are the instances that we have to add an inert solid to either end of the cell diagram? Is it always one or two ends of it?

Gabriel Ordonez 2K

I understand how to approach an acidic redox reaction, but what are the steps to balance a chemical reaction in a basic solution?

Gabriel Ordonez 2K

With the conclusion of the midterm, does anyone know how the final question should've been approached, calculated and solved? What were the types of concepts that were in play in this specific assessment?

Gabriel Ordonez 2K

What are the different types of heat capacities we should take into account for this class?

Gabriel Ordonez 2K

How do open, closed, and isolated system conditions affect a reaction?

Gabriel Ordonez 2K

Isobaric is constant pressure, isochoric is constant volume, and isothermal is constant temperature. With these conditions, you'll need to match up the right equations with each one. There are reversible and irreversible equations.

Gabriel Ordonez 2K

How does entropy change with adjusting pressure, volume, temperature, heat, etc?

Gabriel Ordonez 2K

Why do some molecules have no enthalpies (e.g. zero enthalpy) and other do?

Gabriel Ordonez 2K

What's the difference in the work equations with their corresponding Delta S equations when one path is reversible and when the other is irreversible?

Gabriel Ordonez 2K

You'll need to get the overall change in enthalpy for each equation used. If you're adding equations together to calculate the overall reactionary enthalpy, you'll need to scale and/or flip your equations with the calculated enthalpies to find the final answer.

Gabriel Ordonez 2K

How do we calculate bond enthalpies if we are given a chemical equation showing only the molecules and their number of bonds/atoms?

Gabriel Ordonez 2K

What is the difference between Delta S, Delta S (total), and Delta S (surroundings)? How do we apply these concepts on an examination / question?

Gabriel Ordonez 2K

The first law is about conservation. Everything has an origin and cannot be created out of nowhere. The second law talks about how the universe continues to move towards a state of disorder and higher entropy.

Gabriel Ordonez 2K

The UA’s will have a very helpful study guide for both the final and midterm. Usually, Lyndon completes them and announces it it chem community. Just stay posted. His review session on the study guide is extremely helpful by the way.

Gabriel Ordonez 2K

I would like to add a question on top of that. Could someone define “work” and its relationship to volume.

Gabriel Ordonez 2K

Honestly, your homework can be anything not completed up to this week. Of course, I wouldn’t go back to do week 1 questions, but I would try doing anything recent or applicable.

Gabriel Ordonez 2K

Lavelle does not post any lecture slides or material. I would just find someone who went to lecture and ask them if they could send you their notes.

Gabriel Ordonez 2K

Like last week, test 1 will have 5-7 questions assessing the topics just learned. Test 1 and 2 are not cumulative. The midterm, around 120 points, will be made by Lavelle as with the Final.

Gabriel Ordonez 2K

For Lavelle’s class, you just have to ensure that you know the foundational topics and complete the homework problems when possible. Go to the review sessions, and Lyndon’s LA sessions are pretty helpful.

Gabriel Ordonez 2K

All Hess’s Law is that you balance all of the chemical equations and cancel when possible to ultimately add all of their delta H’s.

Gabriel Ordonez 2K

Thank you for the response. Could someone show me an example of this problem in action. How would I use pH and pOH in an acid/base equilibrium problem?

Gabriel Ordonez 2K

Thank you for the reply, this clarifies a lot for the shift changes. In terms of Q, this makes sense, how about for all the different Le Chatellier’s Principles.

Gabriel Ordonez 2K

You need to balance the equation because the coefficients will be your concentration exponents in the equilibrium constant. Without the balanced equation, your constant is wrong. Also, without balancing the chemical equation, you are breaking the laws of conservation highlighted in chem 14a.

Gabriel Ordonez 2K

You need to balance the equation because the coefficients will be your concentration exponents in the equilibrium constant. Without the balanced equation, your constant is wrong. Also, without balancing the chemical equation, you are breaking the laws of conservation highlighted in chem 14a.

Gabriel Ordonez 2K

Your grades will be given back to you in your upcoming discussion section. The test will be returned, and it would be your chance to contest for any more points. Slim chance that it happens but it’s possible.

Gabriel Ordonez 2K

Pressure and volume are inversely related. An increase in volume decreases pressure and decrease in volume increases pressure, so think of them this way when approaching equilibrium shifts. The side with more moles of gas will shift to the other reactionary side with an increase in pressure or decre...

Gabriel Ordonez 2K

Kw=ka x kb

Kw=10^-14=(1.0x10^-7)(1.0x10^-7)

Gabriel Ordonez 2K

If the Kc, Ka, or Kb is smaller than 10^-3, then you can assume to remove the -x because it is small relative to the other number.

Gabriel Ordonez 2K

Can someone list all the required shift change rule scenarios that Lavelle would want us to know?

Gabriel Ordonez 2K

What is the 5% deal that Lavelle talks about in equilibrium oriented questions. How do we get to that point?

Gabriel Ordonez 2K

The box is a visual aspect that allows us to work towards creating the equilibrium constant easily.

Gabriel Ordonez 2K

It can be both if I remember right. It depends on the LA, but they use a variety of problem examples.

Gabriel Ordonez 2K

The removal of the -x occurs because it is extremely small relative to the chemical equilibrium. We don’t say it is 0 because the numerator would be affected. We say it is small relative to the rest of the equilibrium allowing it to be ignored.

Gabriel Ordonez 2K

An endothermic reaction shifts it towards the products and an exothermic reaction shifts it towards the reactants. Chemical equilibrium changes only when temperature is manipulated.

Gabriel Ordonez 2K

How do pH and pOH play into chemical equilibrium?

Gabriel Ordonez 2K

Any time when there is the presence of forward and reverse reactions, an equilibrium sign will be used. The rate presented should be equivalent in both directions of the chemical reaction.

Gabriel Ordonez 2K

Can someone please explain the importance of the reaction quotient and what on earth it is? I have a general idea, but I tend to confuse it with the likes of Kc and Kp. Thank you!

Gabriel Ordonez 2K

There’s Kc and Kp. Kc concerns the use of the equilibrium constant in reference to concentrations. Kp concerns the use of the equilibrium constant in reference to partial pressures. Solution vs. gas.

Gabriel Ordonez 2K

Are we allowed to interchange the use of Kc and Kp if the question doesn’t specify which type to use?

Gabriel Ordonez 2K

What makes this law ideal, and what differentiates it from a realistic gas? Also, what type of gas is in the atmosphere?

Gabriel Ordonez 2K

What are the types of gas laws that we should know for Chem 14B?

Gabriel Ordonez 2K

What does the R in the Ideal Gas Equation represent? Also, what are the types of values that can be instituted into R?

Gabriel Ordonez 2K

How does a base become stronger and what becomes stronger exactly?

Gabriel Ordonez 2K

A strong acid fully disassociates in a solution while a weak acid partially disassociates in a solution.

Gabriel Ordonez 2K

As Dr. Lavelle explained, the soapy feeling is attributed to the soft salts already present in the water.

Gabriel Ordonez 2K

What is the definition and purpose of conjugate acids and bases?

Gabriel Ordonez 2K

What is the definition of a Bronsted Acid and Base that Dr. Lavelle wants us to know?

Gabriel Ordonez 2K

What is the definition of a Lewis Acid and Base that Dr. Lavelle wants?

Gabriel Ordonez 2K

Is T Shape a subcategory under the trigonal bypyramidal geometry? Also, it has three bonded pairs and two lone pairs correct? Lastly, is the notation the following the following: AX3E2?

Gabriel Ordonez 2K

What do we need to know from bond order, diamagnetism, and paramagnetism for the class and test?

Gabriel Ordonez 2K

Can someone explain to me the basics and purposes of hybridization? Lavelle was quite ambigious when he explained it, so a refresher on the concepts and notes would be very helpful. Thank you!

Gabriel Ordonez 2K

What is exactly contained in the coordination sphere, what is it, and what is the overall purpose?

Gabriel Ordonez 2K

What exactly is a ligand, and what is its purpose relative to our class and tests?

Gabriel Ordonez 2K

VSEPR is meant to describe the structural geometry of molecules in a 3 dimensional plane. It also shows regions of electron density.

Gabriel Ordonez 2K

What does Lavelle mean by VSEPER Notation?

Gabriel Ordonez 2K

Will Chem 14A have a curve? I’ve been reviewing other chemistry community posts, and many say that Lavelle will adjust range percentages accordingly. Can someone explain this? Also, if a student needs at least 50% to get a C-, what are the percent ranges for each letter grade above C-? Thank you in ...

Gabriel Ordonez 2K

In VSEPR, double and triple bonds would still be represented as “single” bonds demonstrably. Lavelle even said that we should think of these spaces as possible spots of electron density where said density of electrons is highest. This is for VSPER models specifically.

Gabriel Ordonez 2K

Do lone pairs weaken bonded electrons, and what other effects do lone pairs have on overall shape and structure?

Gabriel Ordonez 2K

The wedge and dash aren’t necessarily needed for Lewis structures. Lavelle even said that himself. We can still draw the Lewis structures as normal. The wedge and dash were supposed to help students visualize the overall 3d shape in a 2d illustration.

Gabriel Ordonez 2K

What are the VSEPR molecular shapes that we should know, plus their bond angles, for the test and final?

Gabriel Ordonez 2K

Test 2 starts off with materials covered after the midterm. I remember the lecture that did not count for the midterm included the topics of dipole dipole moments and polarization. Every topic after that moment will possibly be on the second test up to sigma and pi bonds that is supposed to be cover...

Gabriel Ordonez 2K

How do we solve for the principal quantum number if we are given values such as velocity and the type of subatomic particle being dealt with?

Gabriel Ordonez 2K

What is the difference between intermolecular forces and intramolecular forces?

Gabriel Ordonez 2K

What is the difference between polarizability and polarizing?

Gabriel Ordonez 2K

Are neon gases included in electronegativity? And if so, does xenon have a higher electronegativity that fluorine?

Gabriel Ordonez 2K

What are the various bonds that will be discussed, and can someone rank their strengths from weakest to strongest?

Gabriel Ordonez 2K

How do we represent dipole moments of varying strengths in a visual, such as a Lewis Structure or anything else?

Gabriel Ordonez 2K

Thank you so much!

Gabriel Ordonez 2K

What is the difference between pi and sigma bonds?

Gabriel Ordonez 2K

I don't really understand the concept behind a coordinate covalent bond. Professor Lavelle skimmed through it during my lecture. Could someone explain this concept to a greater extent and apply it through an example? Thank you!

Gabriel Ordonez 2K

Does the central atom need to be the lowest ionization energy? And in regards to the formal charge, is it the central atom the one that requires a 0 formal charge or the sum of the entire Lewis Structure? Thank you!

Gabriel Ordonez 2K

Can someone please help me review the difference between n, l, and m...? I keep mistaking the three of them, and I am not exactly certain what m and its various subscripts represent. Can someone demonstrate this through an example problem? Thank you!

Gabriel Ordonez 2K

There as a bit of confusion in my study group in regards to ranking F, O, N, Cl, S, P by the following periodic trends: 1) electronegativity 2) atomic radius 3) electron affinity 4) Ionization Energies. Can you help me sort them out correctly? Thank you! 1) Electronegativity? 2) Atomic Radius? 3) El...

Gabriel Ordonez 2K

Hi, I'm doing a review on electron configuration, but I seem to have forgotten the pattern or order behind determining configuration. So if I randomly picked an element on the periodic table, what steps would I need to take to determine its electron configuration and noble gas configuration? Let's d...

Gabriel Ordonez 2K

For s and p block elements, start at the metal side and count up from 1 - 8. That's the basic pattern for determining the number of valence electrons. It's slightly different for d-block elements.

Gabriel Ordonez 2K

Does the transition from n = 5 to n = 3 involve greater energy than one from n = 4 to n = 2?

And does the transition from n = 4 to n = 2 emit radiation of longer wavelength than the transition from n = 5 to n = 1?

Thank you!

Gabriel Ordonez 2K

How do we determine the most ideal Lewis Structure if any polyatomic structure has multiple resonance structures? How do we calculate it? Thank you!

Gabriel Ordonez 2K

29. In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. How many photons of infrared radiation does the lamp generate in 1.0 s? How do we complete the dimensional analysis, like watts to joules if that is even right? I'm reviewing this for the m...

Gabriel Ordonez 2K

When we are calculating the formal charge of an atomic structure, I have a few questions in regards to counting. When we are counting for the number of bonded and lone electrons, do we count in pairs or in electrons individually? This will help me prevent silly mathematical errors. Thank you!

Gabriel Ordonez 2K

How do we know if a specific polyatomic figure has a resonance structure and which would be the most ideal one? For example, could you use the sulfate ion for a demonstration?

Gabriel Ordonez 2K

Can someone please explain the concept behind the Schrodinger equation? Second, can someone demonstrate its application in real-life chemistry situations? Thank you!

Gabriel Ordonez 2K

To write in short hand, find the specific element that you will use. Let’s use S for this example. Find the preceding noble gas first, which is in group 18 in the preceding period. In S’s case, it is Ne. You would write Ne in brackets first at the beginning of the configuration then finish it off no...

Gabriel Ordonez 2K

Dr. Lavelle talked about Black Body Radiation, but he did not really explain it in a detailed manner. What is it, and is this information vital to the course later down the line? Thank You!

Gabriel Ordonez 2K

Can someone please explain to a greater depth the following: Hund’s Rule, Pauli Exclusion Principle, and Aufbau Principle? Thank you in advance.

Gabriel Ordonez 2K

During one of the lectures early last week, Dr. Lavelle discussed the idea of ejecting electrons from the host atom. However, he made a clarification stating that higher intensity does not guarantee the ejection of the electron. So if that’s not what is responsible, then what is? Dr. Lavelle glanced...

Gabriel Ordonez 2K

For this unit specifically, what are all of the chemistry equations and expressions that will be used, from the beginning high school level ones to the advanced ones near the end of this unit? Also, how do we know when to use specific chemistry equations, like the two chemistry equations that both e...

Search found 113 matches