CHEMISTRY COMMUNITY

sophiebillings1E

you may also be given the half-life and asked to calculate k from that, but just use the equation sheet and see what variables are given.

sophiebillings1E

The second equation can only be used at room temperature 298 K.

sophiebillings1E

It would still appear on either side of the equation as well when it comes to rate laws.

sophiebillings1E

You should see which reactants affect the rate most of the time it will only be the slowest step, but it could also entail other steps.

sophiebillings1E

There's no real units for k it's based off what the problem entails whether given concentration or partial pressure.

sophiebillings1E

I'm pretty sure its the percent of successful collisions.

sophiebillings1E

Non-spontaneous reactions because they are adding energy to perform the reaction

sophiebillings1E

The most common form of Electrolytic cell is the rechargeable battery. While the battery is being used in the device it is a galvanic cell function (using the redox energy to produce electricity). While the battery is charging it is an electrolytic cell function (using outside electricity to reverse...

sophiebillings1E

delta G0 is used at equilibrium

sophiebillings1E

Graphite is what allows the electrons to flow from one solution to the next, it connects the two and it was conducts the electron transfer.

sophiebillings1E

Ions are always aqueous and it just makes sense because they are donation or accepting an electron.

sophiebillings1E

If there's a single reactant, how do you know which part is the reducing agent and which is the oxidizing agent?

sophiebillings1E

Constant temperature and pressure provide the opportunity for max work

sophiebillings1E

When K=1 delta g=0
When k<1 delta g is positive
when k>1 delta g is negative

sophiebillings1E

I think it describes the overall spontaneity of the system and whether it is achieved through the delta s or delta h.

sophiebillings1E

It is essentially saying that q and w are equal but opposite

sophiebillings1E

The heat given off or absorbed when a reaction is run at constant pressure is equal to the change in the enthalpy of the system.

sophiebillings1E

It tells you if the reaction is favorable which is based on spontaneity

sophiebillings1E

Last quarter he taught new material until two lectures before the midterm, so I assume that everything stated on the syllabus will be covered.

sophiebillings1E

delta h is the change in enthalpy of the system and q is the heat given off or absorbed in the system

sophiebillings1E

If you remember the diagrams Dr. Lavelle presented to display AxD is equal to the volume since it is the area of the section of the cylinder multiplied by the distance it traveled and in this cause that represents the change in volume.

sophiebillings1E

But if you do disregard x make sure to double check that it is under 5% because if not the solution is incorrect.

sophiebillings1E

Correct because it dissociates completely you assume all of the reactant is used to form the products.

sophiebillings1E

If an inert gas is added to the system the reaction does not shift one way or the other

sophiebillings1E

when Kb is larger than Ka it means that the base is stronger than its conjugate acid. Or that the acid is weaker than its conjugate base.

sophiebillings1E

Just to be safe and check your work you should check to see which way the reaction will move if possible.

sophiebillings1E

Partial pressures change when product or reactant are removed or added to the system.

sophiebillings1E

Charles' Law shows the relationship between the Temperature and Volume of a gas. Temperature and volume have a direct relationship, so if the volume goes up then the temperature goes up and if the temperature goes down then the volume goes down (and vice versa).

sophiebillings1E

In the example,
B(g) + C(g)<-->A(s)
If volume is decreased, would I say the reaction favors products because mole ratio is (2:0)?

sophiebillings1E

I believe since solids and liquids are considered 1 in the equation K=1

sophiebillings1E

My TA said to just memorize the amphoteric metal oxides to make your life easier.

sophiebillings1E

On the final we will just need to apply equilibrium constants to determine the strength of an acid or base correct.

sophiebillings1E

Will we have to compare hydronium ion concentrations for the final? For example, knowing that a pH of 3 has a hydronium concentration 100 times greater than a pH of 5.

sophiebillings1E

You can always check the test bank that has past exam questions. That really helped me on the midterm!

sophiebillings1E

The Bronsted definition: an acid is a proton (H+ ion) donor, and a base is a proton acceptor;
The Lewis definition: an acid is an electron acceptor, and a base is an electron donor.

sophiebillings1E

If there is more than one lone pair they are located so that they are farthest away from other areas of electron density since they have the greatest repulsion.

sophiebillings1E

Also every molecular shape has a specific hybridization, so you can memorize what hybridization matches to a specific molecular shape.

sophiebillings1E

The easiest thing to look at is the molecules symmetry. Most of the time if it's symmetrical it will be non polar, but other than symmetry you have to determine the polarity between each bond and then observe the whole molecule.

sophiebillings1E

It depends on the sig fig in the problem stay true to that.

sophiebillings1E

I think usually it will specify if it's important, however, the arrangement does affect the polarity, so I think it depends on what the question is asking.

sophiebillings1E

Is there any time that a pi bond can rotate or does it break when it begins to rotate?

sophiebillings1E

Does each molecular shape i.e. trigonal planar, tetrahedral always have the same hybridization model?

sophiebillings1E

Bond length is given unless there is resonance then you must calculate it.

sophiebillings1E

How would I go about predicting the polarizability of Anions and the polarizing power of Cations? Is there a periodic trend which can be used to predict such things, or another way?

sophiebillings1E

When drawing the Lewis structure of a trigonal planar model does it matter if the spacing is 120 degrees or can you draw it how we did previously then specify that the angle is 120 degrees.

sophiebillings1E

The more negative the electron affinity value, the higher an atom's affinity for electrons. So the elements in the top corner (chlorine, fluorine) have a more negative value than lower down the column or left. It is more negative because the they give off energy to form an anion exothermic process.

sophiebillings1E

Remember the exceptions to expanding the octet rule begin in period three because that period has the d block only then can the octet rule be altered. However, elements like B and Al can be a part of Lewis acid-base reactions and may only have 6 valence electrons.

sophiebillings1E

It's asking for the short hand configuration where you use the noble gas and then show the valence electrons

sophiebillings1E

Unless it specifies which atom (usually carbon atom) the double or triple bond is on it shouldn't matter.

sophiebillings1E

I don't think it matters however if you are representing it next to another molecule that it could bond with I would put the unpaired one at that side for representation purposes.

sophiebillings1E

It also depends on the orbitals so the d orbital has 10 slots for electrons however if it is 3d^6 only one set of electrons are paired and the other 4 are not paired.

sophiebillings1E

As Dr. Lavelle explained in class only p, d, & f orbitals have nodes, thus they have nodal planes in which the orbitals orient themselves. Since the s orbitals are similar to a sphere they do not contain nodes. Nodes come from the math function that give us each of the orbital shapes which we to...

sophiebillings1E

I normally do problems from the topics we cover that week. i.e. quantum numbers since we just went over that and then a review question from the previous section like a Heisenberg problem.

sophiebillings1E

In class Dr. Lavelle explained in his example that the velocity we calculated using the uncertainty equation must be incorrect because it was greater than the speed of light. I understand the upper bound to determining if a velocity value is realistic is the speed of light, but I was wondering if th...

sophiebillings1E

My TA mentioned that even if you get the wrong answer write all the equations you're using down so that you can receive partial credit and they can see where you go wrong.

sophiebillings1E

I assume like the last test we get all the constants and equations necessary on the cover page and would just have to derive the equations not given.

sophiebillings1E

Essentially the wavelength cannot be measured when it is smaller than 10^-18 thus it is used as the cut off point

sophiebillings1E

There is only one limiting reactant in a single step chemical reaction. If the moles are the same for all reactants none of them are limiting the others' potential to create more product. Thus, there is a perfect amount of reactant to fully react with the others in order to form product.

sophiebillings1E

The implementation of heat basically describes the properties of the reaction further to show if its an endothermic or exothermic reaction which comes into play later with thermodynamics.

sophiebillings1E

The best way to determine what zeros are included is to put the number in scientific notion and from there you will be able to determine the correct sig figs with the zeros. i.e. 0.000500 --> 5.00*10^-4 Thus, in my example there are 3 sig figs which is clear in scientific notation.

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