CHEMISTRY COMMUNITY

Kiara Phillips 3L

I am having quite a bit of trouble on this problem. I understand that I may have to set up an equilibrium constant expression and subsequent quadratic equation and solve for x, plug x back in to the equilibrium and add because the total pressure is the sum of the partial pressures but I am still stu...

Kiara Phillips 3L

From my understanding they are inversely proportional. In other words as one increases the other decreases.

Kiara Phillips 3L

Kc vs Kp Fro my understanding they both have to do with the equilibrium constant it is just that Kp is when you are dealing with pressure and gas and Kc is everything that does not fit into that category.

Kiara Phillips 3L

From my understanding its best to imagine the relationship like this: <------|------------|-------------|-----------> -------Q ---------->K<------------Q If Q is less than K the reaction will shift to the right If Q is greater than K the reaction will shift left If Q=K the reaction is at equilibrium...

Kiara Phillips 3L

When you remove the product you disturb the equilibrium and to counteract that the reaction will produce more products to "stabilize" the reaction again. I put reaction in quotes because a reaction is never truly stable the products and reactants are moving back and forth but at equal rate...

Kiara Phillips 3L

From what I have seen usually questions will provide us with the temperature in Celsius and we are expected to covert it to Kelvin.

Kiara Phillips 3L

The way that I approached the question was to assign values for the concentrations of HCl in solution, as long as the values met the criteria. I began with 1.0 M HCl in a 1L solution, which would yield 1.0 mol of HCl. Since the dilution reduced the HCl to 12% of its initial value, there would be 1....

Kiara Phillips 3L

The question asks: The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the difference in the pH values of the two solutions? Can someone walk through how they would go about solving this question? What information do I need to know before I...

Kiara Phillips 3L

I don't think we have to know Arrhenius acids and bases in-depth, especially because Dr. Lavelle didn't go over them. I think I remember from one of the UA review sessions that your definition would be enough in terms of just knowing what they are for the final. However, I think we don't really nee...

Kiara Phillips 3L

Although these are not experiments I would add that you might want to be familiar with the ideas behind the DeBroglie equation, Heisenberg’s indeterminacy equation, and Bronsted and Lewis acids and bases. As far as experiments I believe you covered them all!

Kiara Phillips 3L

In addition to Lewis and Bronsted acids and bases do we have to study in depth about Arrhenius acids and bases? If so, is it enough to know that Arrhenius acids produce hydrogen ions and Arrhenius bases contain hydroxide ions?

Kiara Phillips 3L

I would also remember henderson hasselbalch equation and be able to use it to solve for Ka [A-] and [HA].

Kiara Phillips 3L

Honestly I think its best to memorize them and the trends associated with them so you can identify them quickly on the exam. Acids usually start with H and some end in COOH. Strong bases that we are interested in contain OH and weak bases of our interest typically contain N.

Kiara Phillips 3L

Someone wrote that when pKa is less than pH the acid will give off proton(s) and become negatively charged. So my question is does this mean that when pKa is greater than pH the acid gains protons and becomes positively charged? Or does not reaction happen at all because we are only looking at wheth...

Kiara Phillips 3L

From my understanding, the angles mark the distance between one oxygen, back to the sodium molecule and back out to the next oxygen. I believe that the reason the distance does not add up to 360 degrees is because the oxygen molecules themselves occupy space within the "circle" of the comp...

Kiara Phillips 3L

Because NH3 only has 1 lone pair of electrons it is considered a weak base so then would HBr be considered a strong base because it has 3 lone pairs? This topic is a little cloudy for me still...

Kiara Phillips 3L

To add to what Akshata mentioned, I think it is also important to note that when a Brønsted acid dissociates, it increases the concentration of H+ ions in the solution; conversely, Brønsted bases dissociate by taking a proton Fromm the solvent (water) to generate [OH-]. It is also important to under...

Kiara Phillips 3L

I believe the bond angle would increase. Based on the fact that in the sp hybrid, 1 of the 2 orbitals are s. Where as in the sp2 hybrid, 1 out of the 3 orbitals are s. Looking at them as fractions helps me with this concept.

Kiara Phillips 3L

I understand that when naming a coordination compound the cation comes first and then the ligands in the complex ion are next in alphabetical order, next is the metal atom or ion before the ligands in the chemical formula but I am still a tad bit confused. Does anyone have any tips that they utilize...

Kiara Phillips 3L

Just remember when looking at the first row that they each have unique biological functions and you should be fine.

Kiara Phillips 3L

Is is sufficient enough to know that if an atom has one bond it is a sigma bond, and double and triple bonds contain sigma and pi bonds with double bonds having one each and triple bonds having one sigma and 2 pi bonds? I feel like that could be enough info but I just want to be sure I understand it...

Kiara Phillips 3L

From my understanding, any molecule can be a coordination compound as long as it poses one or more metal centers that is bound to ligands or anything that donates electrons to the metal.

Kiara Phillips 3L

I understand exactly how you feel, the most troubling part is that I really practiced and studied for it too. Hopefully we all hit it out of the park on the final!

Kiara Phillips 3L

From my understanding, dipole moments tell you how polar a bond is. So first find the most polar bond, or bond with the greatest difference in electronegativity.

Kiara Phillips 3L

Thank you so much you are too kind!

Kiara Phillips 3L

Another thing that is important to at-least be familiar with is that the formation of radicals sometimes involves the breaking of covalent bonds, and that process can requires significant amounts of energy.

Kiara Phillips 3L

Honestly, what helps me is watching videos on the topic and writing. To memorize things I write using pencil and paper over and over again until it becomes muscle memory. Then, when its time for the exam you will have practiced it so many times you will be able to recreate the table in real time to ...

Kiara Phillips 3L

Yes elements there can have an expanded octet. As long as the element meets the criteria of having d-orbitals and are located in the third period it can happen.

Kiara Phillips 3L

From my understanding, a high vapor pressure leads to a low boiling point.

Kiara Phillips 3L

You are correct in assuming that!

Kiara Phillips 3L

MCalcagnie_ 2H wrote:Clearly I didn't fully understand this concept haha thanks for clarifying everyone!

Literally! This forum helps me so much!

Kiara Phillips 3L

Yes because the two are almost one in the same, a H bond is a type of dipole-dipole interaction!

Kiara Phillips 3L

From my understanding, O has lower ionization enthalpy than N because N has a half-filled electron configuration. The lower ionization enthalpy of O is less than F because of the higher electronegativity and high effective nuclear charge of F. Hope this helps!

Kiara Phillips 3L

I know that to find bond length we have to refer to the trends of ionic/atomic radii. I would just compare each atom and as long as things align with the rules of the trend you should be fine.

Kiara Phillips 3L

You are right larger atoms do have weaker bonds, it's just that boiling also weakens bonds. Sometimes the two relate to each other sometimes they do not it depends from situation to situation.

Kiara Phillips 3L

You almost have it! Like it has already been said, covalent bond multiplicity has to do with bond order, atomic radius is the distance between atoms, and unpaired e- refers to the lone pairs of neighboring atoms. More unpaired electrons means that it is more likely that you are dealing with a weaker...

Kiara Phillips 3L

I understand where we apply the principles of electronegativity but how does the trend of atomic radius relate to physical effects on the elements that we can use to study them?

Kiara Phillips 3L

I think Ba is correct because Ba has a lower electronegativity and therefore a lower covalent character so by association Ba is more soluble in water than Mg.

Kiara Phillips 3L

The biggest thing that helps me is looking at polarity. First, I knew that choice E was correct because there is no electronegativity difference between the Br atoms (only can have London dispersion forces). Next, I looked for hydrocarbons (choice A). They are not polar, and can only have London di...

Kiara Phillips 3L

I noticed that too and honestly I suggest you use the trends on the periodic table to guide you those can point you in the general direction for the types of problems we are doing right now. There are other tables provided in the textbook but I doubt we will be able to use those on an exam. If anyon...

Kiara Phillips 3L

Hello
Yes, because salts are help together by ionic bonds and contain cations and anions and molecules are held together by covalent bonds.

Kiara Phillips 3L

I suggest being extremely through, writing out every step with its corresponding units, maybe even a sentence on the side describing what you did during that step before moving on.

Kiara Phillips 3L

Use whatever one you prefer, they are interchangeable!

Kiara Phillips 3L

Increases across a period and increases as you move up/decreases down a group.

Kiara Phillips 3L

I know that hydrogen, beryllium, and boron are electron deficient and because of that they have too few electrons to form an octet. There may be more exceptions though.

Kiara Phillips 3L

Hope this helps!https://www.google.com/url?sa=i&url=https%3A%2F%2Fsciencenotes.org%2Fperiodic-table-trends%2F&psig=AOvVaw2v0EJsqqKxlzaPmHpmDnSu&ust=1604695153829000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCOiVsreh7OwCFQAAAAAdAAAAABAD If you are a visual learner like me I hope y...

Kiara Phillips 3L

The particle model!

Kiara Phillips 3L

Partial points will be afforded but from what I have heard so far there will not be a curve on this exam or in the class in general.

Kiara Phillips 3L

I suggest studying in intervals of 25 minutes and taking a 5 minute break before returning. This prevents burnout and gives you time to recenter yourself!

Kiara Phillips 3L

Recently I found that having cup of tea or water by my side helps me. I suggest tea because the smell might calm you even if you do not stop for a drink.

Kiara Phillips 3L

The best way I can explain it is that sub-shells are a part of shells and each sub-shell contains at least one orbital and orbitals can hold 2 electrons (maximum).

Kiara Phillips 3L

No not at all just understand how to read it and you will be just fine!

Kiara Phillips 3L

If you are dealing with mass or velocity this formula is the best.

Kiara Phillips 3L

In this case they would be asking you to find the work function/threshold energy.

Kiara Phillips 3L

No, unfortunately there is not any fun chemistry there it just passes through the material.

Kiara Phillips 3L

You may need to convert grams to kilograms, good luck!

Kiara Phillips 3L

Jordanmjones13 wrote:Do you know if the problems will specifically tell us how many significant figures to use?

No, and because this is a useful tool for chemistry in general it is best that we learn the rules although they are tasking at times. Good luck!

Kiara Phillips 3L

You are suppose to use E=hv with protons because they do not have mass thus the m is missing from the equation. While for E=1/2mv^2 is used for electrons or anything else that has mass and most of the time in the problem they either give you the velocity or the mass which is a huge giveaway to whic...

Kiara Phillips 3L

For our purposes, yes. Speed will always be C or 3*10^8 :).

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