CHEMISTRY COMMUNITY

MTanikella_1K

I think we will need to know molecularity conceptually and be able to identify a given reaction's molecularity.

MTanikella_1K

The final will be submitted via CCLE.

MTanikella_1K

Yes the final exam is timed and we will have three and a half hours to complete six questions.

MTanikella_1K · Re: Final time Yes the final will be from 11:15AM to 2:45 PM.

Yes the final will be from 11:15AM to 2:45 PM.

MTanikella_1K

The final will be online so we will not need to print anything out.

MTanikella_1K

There are probably worksheets given out during the workshop sessions or by TAs but homework problems are a great resource for practice.

MTanikella_1K

I would recommend going back through the the textbook and reading the breakdown of steps for each type of problem. You can also try working backwards and look at the work written in the solutions manual.

MTanikella_1K

Test 2 will cover sections 5G and 5J from outline four and 6K-6O from outline five.

MTanikella_1K

Test 2 will cover the second page of thermodynamics and all of outline five.

MTanikella_1K

Homework from electrochemistry or kinetics should be fine!

MTanikella_1K

I think we will be given our tests back next week during discussion section.

MTanikella_1K

Congrats Rachana!

MTanikella_1K

Test 2 will cover material that we have gone over after the midterm, including the second page of outline 4 and outline 5. I would assume Test 2 will more closely resemble the structure of Test 1 as they are both not cumulative in nature.

MTanikella_1K

In an acidic solution, use H2O and H+ to balance the reaction.

MTanikella_1K

Problems from 5G and 5J will be covered on test 2.

MTanikella_1K

Homework problems, review sessions, lecture notes and online videos are great resources to use when studying for this class!

MTanikella_1K

As mentioned above, I don't think there are official study guides for this course but the topic outlines and homework problems should be a good representation of what topics to know and what to expect on the test.

MTanikella_1K

Test 2 will cover the second page of outline 4 and all of outline 5, but it will not be covering chemical kinetics.

MTanikella_1K

Yes, Test 2 has been moved to week 9.

MTanikella_1K

I believe Test 2 will cover the rest of thermodynamics (second page of outline 4) and all of electrochemistry (outline 5).

MTanikella_1K

I don't believe there are any extra credit opportunities in this class.

MTanikella_1K

The general set up of the midterm is eight questions and the test is out of 120 points.

MTanikella_1K

Homework problems from outlines 4 and 5 should be accepted!

MTanikella_1K

Test 2 will not be cumulative. Instead, it will focus on topics we cover after the midterm.

MTanikella_1K

There will be midterm and final review sessions held by the TAs and UAs which will usually be supplemented with worksheets. Other than homework, Sapling Learning and online module questions, I don't believe there are official study guides for this class.

MTanikella_1K

5 posts are due every Sunday and the easiest way to keep track of the number of posts is to subtract your total from 50!

MTanikella_1K

There is no class on the day of the midterm but there are small q&a sessions during class times.

MTanikella_1K

The midterm is from 6-8PM.

MTanikella_1K

Most equations are given to us on the equation sheet, but make sure you know what the variables represent.

MTanikella_1K

Homework 5 can be from the later parts of outline 3 or outline 4.

MTanikella_1K

Dr. Lavelle posted a document on his website with all information regarding the midterm! The midterm will cover through outline 4 except any topics from chapter 5.

MTanikella_1K

Yes, the midterm will cover content from 4J.

MTanikella_1K

The midterm will be cumulative of topics through thermodynamics. Dr. Lavelle made clear during lecture that the midterm will not cover any topics from Chapter 5 in Outline 4.

MTanikella_1K

It should be fine to do problems from outline two for homework three as long as you complete five problems!

MTanikella_1K

Kp is used when all products and reactants in the equation are gases. Another indication to use Kp is if the question uses units like bar or atm. Kc is used when the molarity of the products and reactants is given, even though the products and reactants involved in the reaction are gases.

MTanikella_1K

Review sessions dedicated to the midterm might have helpful worksheets which replicate problems we can expect on the midterm but other than that, Sapling learning, textbook problems and online module post assessments are the best resources for practice.

MTanikella_1K

Sig figs count on test 1 and for pH, the numbers after the decimal point are counted for sig figs. Dr. Lavelle has a document on his website regarding sig figs rules which will be helpful!

MTanikella_1K

Lower pKb indicates a stronger base. We know that pKb is the -log(Kb) so if the value of Kb is large, pKb will be lower. The greater the value of Kb, the lower the value of pKb (stronger base).

MTanikella_1K

The midterm will cover content from outlines 1-3 and part of outline 4.

MTanikella_1K

Based on the syllabus, I do not believe there are any extra credit opportunities in this class.

MTanikella_1K

It is a fair question to expect on Test 1. If a reaction is exothermic, delta H will be negative as heat is released while a reaction that is endothermic will have a positive delta H as heat is needed.

MTanikella_1K

You don’t need to memorize specific values but it will be very helpful to know common equations we have gone over in class!

MTanikella_1K

Test 1 covers outline 1 and 2 which are chemical equilibrium and acids and bases.

MTanikella_1K

It is best to keep solids and liquids out of the ice table as they are not used to calculate K.

MTanikella_1K

Outline 1 and 2 will be covered on Test 1!

MTanikella_1K

Khan academy and organic chemistry tutor videos are very helpful!

MTanikella_1K

No you do not include liquids or solids in ICE tables.

MTanikella_1K

The midterm and final are cumulative of the topics we cover in class and connect multiple concepts while tests are condensed versions, covering less material.

MTanikella_1K

I don't think there are any practice tests Lavelle provides but homework problems, post assessments from the online modules and Sapling Learning are all great resources for preparation!

MTanikella_1K

To calculate Q and K, your equation should be balanced.

MTanikella_1K

I believe that Dr. Lavelle mentioned Test 1 will cover outline 1 and outline 2

MTanikella_1K

Numbers after the decimal point count as significant figures for pH.

MTanikella_1K

This depends on each reaction, but if the reaction is moving in the forward direction, reactants in the ice table will have a change of -x and products in the ice table will have a change of +x.

MTanikella_1K

Test 1 will most likely cover the entirety of chemical equilibrium and part of outline 2.

MTanikella_1K

Memorizing the amphoteric oxides is really helpful!

MTanikella_1K

Dr. Lavelle didn’t really emphasize or focus on bond order so I don’t think we will be expected to know this concept for the final.

MTanikella_1K

There is a table in the textbook and Dr. Lavelle also mentioned them during lecture! Strong acids are HI, H2SO4, HCl, HBr, HNO3, HClO4 and strong bases are group 1 and group 2 oxides and hydroxides excluding magnesium.

MTanikella_1K

Lyndon’s review session helped with clarifying concepts covered in his packet which was just as effective as practice tests!

MTanikella_1K

As everyone has mentioned, youtube has some really useful videos for understanding the concepts we cover during lecture. Exposing yourself to as many problems as you can will be very beneficial because it will solidify your understanding of the topics. In addition, I think that reworking problems ca...

MTanikella_1K

In lecture, Lavelle recommended going through the acid rain problems in the textbook so I think we should be familiar with the biological applications of what we learned in the context of acid rain and air pollution.

MTanikella_1K

I would definitely recommend reworking all the assigned homework problems and making sure you know the concepts behind these questions. The midterm is also a valuable resource to review again!

MTanikella_1K

A Bronsted acid is a proton donor and a Bronsted base is a proton acceptor. A Lewis acid is an electron pair acceptor while a Lewis base is an electron pair donor.

MTanikella_1K

It does not make a difference because both (OH2) and (H2O) represent the same molecule; (OH2) simply highlights the interaction between the lone pair on the oxygen and the central metal atom.

MTanikella_1K

The melting point would most likely decrease.

MTanikella_1K

Hybridization is determined using the VSEPR theory and considering the molecular shape of the molecule. Based on this, BeCl2 has an sp hybridization. BH3 has an sp2 hybridization. BH42 has an sp3 hybridization and SiF4 has an sp3 hybridization.

MTanikella_1K

Yes a triple bond consists of one sigma bond and two pi bonds

MTanikella_1K

Order does not matter as long as you state that there is one sigma and two pi bonds

MTanikella_1K

The final is cumulative!

MTanikella_1K

If there's only one X and E, the subscript of one is unnecessary.

MTanikella_1K

Sigma and pi bonds will be covered on Monday during lecture and they will be on test 2!

MTanikella_1K

There are no specific rules pertaining to radicals in VSEPR theory. This means that one lone electron would be considered the same as one lone pair (in terms of regions) when determining the total regions of electron density.

MTanikella_1K

The strength of repulsion is as follows: lone pair-lone pair>lone pair- bonding pair> bonding pair- bonding pair. This allows us to conclude that lone pairs have the highest repulsion and therefore affect the bond angles, usually resulting in a slight decrease in the angles overall.

MTanikella_1K

Test 2 covers Outline 4 and pulls from concepts covered in Outline 3, specifically 3F.

MTanikella_1K

A double bond stabilizes the structure by bringing the formal charge closer to or equal to 0. A Lewis structure is most stable when the central atom has a formal charge of 0 and in some cases, a double bond is needed to achieve this.

MTanikella_1K

Although test 2 may not focus on periodic trends specifically, it is useful to know these trends as they are helpful in determining the behavior, structure and overall polarity of molecules.

MTanikella_1K

I believe he will be releasing the average during lecture at some point this coming week.

MTanikella_1K

Electronegativity increases as you go across a period and decreases down a group. It is the measure of how strongly atoms attract bonding electrons to themselves.

MTanikella_1K

Electronegativity does follow the same trend as ionization energy and electron affinity. Make sure to remember that there are a few exceptions to the ionization energy trend, but other than that these three properties all share the same trend (increasing across the period and decreasing down a group).

MTanikella_1K

Oxygen is an exception to the trend because it is easier for oxygen to give up an electron to have a more stable configuration than it is for nitrogen to give up an electron. This is because nitrogen has three electrons in the p orbital, which is relatively more stable than the four electrons oxygen...

MTanikella_1K

Polarizability applies to anions and shows that a larger radius (heavier element) correlates with a high polarizability. This is because a larger radius means more electrons and the valence electrons experience a weaker pull from the nucleus. Since it is easier to distort this electron cloud, the po...

MTanikella_1K

Khan Academy and Bozeman Science are also great channels for reference!

MTanikella_1K

Aufbau's principle shows the order in which orbitals should be filled while Hund's rule describes that every orbital in a subshell should be occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

MTanikella_1K

I don't think it will be necessary to know this concept for the midterm even though it was briefly mentioned in lecture.

MTanikella_1K

Formal charge compares the number of electrons around a "neutral atom" with the number of electrons around an atom in a molecule. It plays a key role in creating relatively stable lewis structures.

MTanikella_1K

The midterm will mostly be open ended questions but I think there may be some multiple choice questions as well!

MTanikella_1K

Atomic size decreases across the period and increases down the group while electronegativity increases across the period and decreases down the group.

MTanikella_1K

Based on what Dr. Lavelle has said in class, I don't think there is any extra credit opportunity as of now.

MTanikella_1K

This equation shows the inverse relationship of the uncertainty of momentum and position, therefore proving that it is impossible to be certain of both values at the same time. Essentially, the more precise the momentum is, the less precise position is and vice versa.

MTanikella_1K

Electronegativity is a property of an atom that isn't necessarily measurable while electron affinity is a value that can be measured. Both properties have the same periodic trend.

MTanikella_1K

For any doubts I have with fundamental concepts, khan academy is a great resource! I definitely think that reviewing my lecture notes after class is a really useful way of solidifying the material Dr. Lavelle teaches.

MTanikella_1K

I think the midterm will cover the material Dr. Lavelle talked about in the first few lectures of Chemical Bonding.

MTanikella_1K

Reading the relevant chapters, taking notes on the video modules and reviewing the homework problems are all great ways to prepare for the week and get better with the material.

MTanikella_1K

All equations will be provided but it will be helpful to familiarize yourself with problems dealing with these equations and the constants involved, such as Planck's constant, the mass of protons, neutrons, electrons, etc.

MTanikella_1K

Yes the speed of light is a constant and you can use 2.998*10^8 or 3.0*10^8 for its value.

MTanikella_1K

ml is the third quantum number.

MTanikella_1K

As mentioned in the previous post, the de broglie equation should be used for this problem. The calculations will show that there is no difference in the first three significant figures of the wavelength.

MTanikella_1K

Electron mass is very negligible as mentioned in the posts above, but it is good to know this value just in case!

MTanikella_1K

The video modules are another great resource for review!

MTanikella_1K

Sig figs should only be taken into consideration when you have calculated the final answer. In the steps leading up to the final answer, use the entirety of the values to get an accurate answer. As mentioned, applying the rules of sig figs in between calculations can lead to extremely rounded final ...

MTanikella_1K

The best way to approach a unit conversion question is convert the units given to an SI unit and then use dimensional analysis to get to the desired unit-- in this case, you can convert Angstroms to meters.

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