CHEMISTRY COMMUNITY

805295074

Thank you Dr. Lavelle! You're positive and energetic attitude made zoom university better!

805295074

Hey! I'm apart of YMAA (youth movement against Alzheimer's) and MEDLIFE EAch are a lot of fun and MEDLIFE has trip every year to Peru to help the communities there!

805295074

I try to take a few hours before my classes to eat, shower, and relax. After classes, I work hard until midnight to make sure I feel productive. Usually, I take one day out of the week and do whatever I want as a reward.

805295074

I think it has to do something entropy. The universe prefers disorder so it will make it very difficult to organize reactant molecules into orderly compounds so it has a higher EA. The universe prefers the reverse of an endothermic because it releases energy and increases disorder so it has a lower ...

805295074

Here is a way to think about it: a relay team running a race will have the fastest time as their slowest runner. You can also think about it in terms of limiting reagents because the reaction can only produce so much product as there are limiting reactants.

805295074

To find the rate constant you must find the order of all the reactants and plug in the values from the table.

805295074

To use this the cell has to be in standard conditions.

805295074

I believe that the reaction rate for reactants will always be negative because they are converted to products.

805295074

When I burnout it is pretty hard to get back into work mode. So, I promise myself that I will take one day out of the week where I do whatever I want. This usually motivates to continue working during the week.

805295074

One thing I remember is that to calculate the overall order of multiple reactants, you add their exponents together. He goes over this towards the end of the lecture on Friday. You can also take a look at the unique average rate for a reaction.

805295074

I believe it will be 60% new material and the rest is old. At least that's how it is for my other classes.

805295074

The book says: "Increasing the concentration of that species, usually a product, slows down the reaction because the species participates in a reverse reaction." Does this have to do with equilibrium? if there is an increase in products, the reaction rate of products will slow down and the...

805295074

How do you know when a reaction is spontaneous based on E?

805295074

When do you add a neutral metal to the end of a cathode or anode in a cell diagram? For example, why does the cathode in |Hg|Hg2+||No3-, H_| NO| Pt(s) only have the platinum?

805295074

When we are given a reaction such as H+ + OH- --> H2O how do we write the balanced half reactions? Does H+ not have the same charge in each reaction?

805295074

How do we know what kind of galvanic cell to make if it tells us to make one under "solubility equilibirum" or "Bronsted neutralization reaction"? What does it mean?

805295074

How do we calculate the number of moles in a cell given a reaction to plug into ΔG?

805295074

I'm pretty sure in about 3 days, at the most, a week.

805295074

To measure a volt, you use a voltmeter and that has two nodes attached to two ends of the circuit. The difference between those two nodes is the voltage.

805295074

I remember it by looking at the charges: if the charge decreased, then I know it gained electrons because they have a negative charge.

805295074

I don't have a favorite food but my favorite meal is pancakes, bacon, and scrambled eggs.

805295074

The purpose of the salt bridge is to keep the solutions neutrally charged.

805295074

Congrats! We only have a few more weeks ahead of us! Finish strong!

805295074

State functions depend on final and initial states.

805295074

How do we determine entropy based on molecular structures? I know degeneracy depends on the number of molecules and the states that they form.

805295074

Another helpful idea I learned is that entropy is "the chaos in the universe" and we do work (exerting energy) to put it back in order.

805295074

The problem will specify what conditions the reaction occurs and that tells us when to use cp or cv.

805295074

I'm taking chem 14BL right now and it's not too bad. Most of the material we have not gone over in class, however, you should some of this stuff from high school chemistry. Similarly, the professors are very helpful and post explanation of the concepts that we may have not learned.

805295074

it's going to be an exciting game. I'm rooting for the buccaneers.

805295074

The internal energy doesn't change because initial and final states are the same. (state function)

805295074

We learned this in our first lecture discussing Thermodynamics. Usually, you use this equation to find heat capacity, specific heat, moles, or the change in temperature. It is good to remember the q system = -q surroundings and delta U = q + w.

805295074

You have to find the heat capacity of the calorimeter and then multiply by the delta T of the second compound.

805295074

Steam is still heating up after it is evaporated. It still has potential for the molecules to heat up more and disperse farther into the universe.

805295074

Reversible expansion is theoretical because the theory is that all heat can be converted to work, which is not true.

805295074

Steam is still heating up when it is released as vapor, therefore, it is hotter than boiling water.

805295074

Benzene is more stable and less reactive than would be predicted from its Kekulé structures. Use the data in Table 4E.3 to calculate the lowering in molar energy when resonance is allowed between the Kekulé structures of benzene.

How would you solve this problem? What are they asking for?

805295074

How would you solve for N2O5?
Calculate the standard enthalpy of formation of dinitrogen pentoxide from the following data:
2NO(g)+O2(g)→2NO2(g). ΔHo=−114.1kJ
4NO2(g)+O2(g)→2N2O5(g)ΔHo=−110.2kJ
and from the standard enthalpy of formation of nitric oxide, NO = +90.25

805295074

They want to make it clear for us that mixing water and ClO- gives an conjugate acid and base.

805295074

It depends if you are given the initial concentration of the reactants or products: if you're given the concentration of reactants, then products are "+x" and reactants are "-x" and vice versa.

805295074

What is the general steps to solving polyprotic acid problems?

805295074

If we are given the initial concentration of HA, do we use an ICE box to solve the problem? As in the problem 6D.13: Rank the following solutions in order of increasing pH: (a) 1.0 ×10−5 M HCl(aq);(b) 0.20 MCH3NH3Cl(aq);(c) 0.20 M CH3COOH(aq);(d) 0.20 M C6H5NH2(aq). Justify your ranking.

805295074

How do you know when an acid is strong from its Ka and pKa? Same thing for a base.

805295074

Why does a reaction shift towards the reactants when there is an increase in pressure? Is it because they are not dissociated? I read on a website that in a response to an increase in pressure, the reaction will shift to the side with the least amount of moles.

805295074

It seems like the homework is due every other week.

805295074

Are we supposed to know thermodynamics in equilibrium even though he didn't cover it in lecture?

805295074

A reaction mixture that consisted of 0.400 mol H2 and 1.60 mol I2 was introduced into a flask of volume 3.00 L and heated. At equilibrium, 60.0% of the hydrogen gas had reacted. What is the equilibrium constant K for the reaction H2(g)+I2g)⇌2HI(g)at this temperature?' How do I solve the problem? Do ...

805295074

How do you use thermodynamics to conclude that a reaction is stable?

805295074

Use the information in Table 5G.2 to determine the value of K at 300 K for the reaction 2BrCl(g)+H2(g)⇌Br2(g)+2HCl(g).

Can someone help me with this problem?

805295074

I'm confused on how to solve this problem:

At a certain temperature, 0.660 mol SO3 is placed in a 1.50 L container.

2SO3(g) <--> 2SO2(g)+O2(g)

At equilibrium, 0.120 mol O2 is present. Calculate K.

If anyone can help, I would appreciate it.

805295074

I believe he wrote the equilibrium constant equal to the activity in the first lecture.

805295074

Temperature is considered a constant because it is directly proportional to pressure.

805295074

I don't have access to the homework yet but I can try and help. For part B, you use the new coefficients in the for equilibrium constant. I believe you should get either the same or a multiple of the original ratio.

805295074

Hey! As far as I understand, the conditions are as follows: at constant temperature and pressure, the volume of the gas is proportional to the number of moles. I searched it up to double check and I posted the link.https://www.westfield.ma.edu/PersonalPages/cmasi/gen_chem1/Gases/ideal%20gas%20law/pv...

Search found 53 matches