CHEMISTRY COMMUNITY

Vinita Saxena 2I

I line up the consonants and the vowels: Reduced + Cathode, Oxidized + Anion

Vinita Saxena 2I

PDTVHUGS:
If you're feeling under Pressure or Depressed, all you want to do is watch TV and get HUGS. Good luck!

Vinita Saxena 2I

It'll be up Sunday at the same final time, 11:30.

Vinita Saxena 2I

Yes, it can change if the temperature changes, that is the only way it can change

Vinita Saxena 2I

Only count the moles of gas, those are the ones most affected by a change in pressure

Vinita Saxena 2I

It depends on what information you're given!

Vinita Saxena 2I

Use Ka or Kb when using ICE tables

Vinita Saxena 2I

We just have to wait for emails from Lavelle and TAs telling us what they're planning.

Vinita Saxena 2I

That's right, catalysts are present at the start and end of the reaction.

Vinita Saxena 2I

All of the review sessions are now posted on the website!

Vinita Saxena 2I

Electrons travel from cathode to anode, so cathode>anode means work is done.

Vinita Saxena 2I

Adding electrons is the very last step, once you add the H+ for acidic or OH-/H2O for basic you add electrons to balance out charge. When adding the half reactions together make sure to multiply the reactions if needed so the electrons are equal.

Vinita Saxena 2I

It works the same! You can add carbon (gr) instead of platinum.

Vinita Saxena 2I

That's right

Vinita Saxena 2I

Yup, cathode is reduced and anode is oxidized!

Vinita Saxena 2I

Put the solids on the outsides, but other than that there is no convention for the order when there is a comma

Vinita Saxena 2I

Typically the anode is on the left and the cathode is on the right. The anode is the oxidized side and the cathode is the reduced side.

Vinita Saxena 2I

It doesn't matter, but usually biologists use the log version of the equation

Vinita Saxena 2I

Here you can pretty much measure delta G instead of using delta H, delta S, etc to calculate it.

Vinita Saxena 2I

Use pKa to get the concentration of H3O+ (using an ice table) and then use the concentration of H3O+ to get the pH

Vinita Saxena 2I

Convention is to write anion (oxidation) on the left and cation (reduction) on the right. Therefore left to right means anion to cation.

Vinita Saxena 2I

The cell potential is different at each time after you flip the switch because the battery is slowly dying/reaching equilibrium. Because of this, it is not at max potential anymore. Max potential is right before you flip the switch because the battery is building up, and then once you flip the switc...

Vinita Saxena 2I

They show how the two beakers are connected (through a salt bridge and with a conductor) and where they are separate. It's a tool to help you visualize what's going on.

Vinita Saxena 2I

Since it's only 50 minutes long and worth 50 points, it will be similar to Test 1 but since we have more topics for Test 2 it will most likely be harder

Vinita Saxena 2I

The big thing is the number of electrons on each side have to be the same, so multiply each half reaction by a number to get the same total electrons on each side. Other than that it's pretty much the same!

Vinita Saxena 2I

when using the specific heat capacity of a gas, they'll specify if it's under constant pressure or constant volume. That'll tell you which to use.

Vinita Saxena 2I

Gibbs free energy is usually a delta, so final minus initial. When delta G is negative the products have less gibbs free energy, making the reation spontaneous

Vinita Saxena 2I

Irreversible is when the system changes all at once and reversible is when the system changes a tiny bit at a time so the surroundings and the system are always equal to each other at every partial change.

Vinita Saxena 2I

No video outlines, the only ones he has are chemical equilibrium.

Vinita Saxena 2I

Just count the coefficients since the subscripts are part of the molecule, not separate molecules.

Vinita Saxena 2I

Sunday at 11:59pm and Lavelle has a system that counts it up at the end of the quarter I believe

Vinita Saxena 2I

When delta G is 0 there is no preference to products or reactants, so it is at equilibrium.

Vinita Saxena 2I

Yes, because there are more possible states and arrangements of the 5 moles of H2O compared to 2 moles H2O.

Vinita Saxena 2I

In a vacuum there is no external pressure, so there is nothing to push back against, meaning w=0

Vinita Saxena 2I

In this case, specific heat capacity uses grams, but if he had used the molar heat capacity then he would have needed to convert to moles using the concentrations.

Vinita Saxena 2I

Micah3J wrote:Does anyone have a list of the formulas we should be familiar with for this midterm?

The formula sheet is the same one we got for Test 1

Vinita Saxena 2I

You need at least 250 points to pass the class and Lavelle curves the final grade distributions after the final has been graded

Vinita Saxena 2I

the pizza rolls worksheet has the same concepts and questions that will be on the midterm but it is not formatted the same way as the midterm.

Vinita Saxena 2I

Heat energy, like all energy, can't be created or destroyed, also known as conservation of matter.

Vinita Saxena 2I

If we need to know this you'll be given the graph, just use the graph to figure out the different cutoffs to calculate the reaction changes.

Vinita Saxena 2I

Yes, constant external pressure

Vinita Saxena 2I

The volume of a closed system can change if there is a piston, especially when gases are involved.

Vinita Saxena 2I

Since Lavelle put it in his math help, I believe we will need to use it if needed.

Vinita Saxena 2I

Adding on, steam can be any temperature above 100, while water can be 100 degrees max. So when steam hits your skin it condenses from a higher temperature, releasing a lot of heat in the phase change, which causes severe burns.

Vinita Saxena 2I

They are zero because the most stable form is the form they are found, which means it takes energy to change its form. This gives a baseline to start with, like how Lavelle gave the example of sea level being 0 for airplanes.

Vinita Saxena 2I

There is no formula, so they will give us the values

Vinita Saxena 2I

When steam touches your skin it has to change state, so it releases a lot of energy into your skin. Water is already a liquid so there is no phase change, which means less heat is released

Vinita Saxena 2I

You don't need to know that

Vinita Saxena 2I

K is Kc if you are using concentrations, but you can convert Kc to Kp using PV=nRT since n/V is concentration(molarity).

Vinita Saxena 2I

There will be no change in equilibrium, even if there is a change in pressure.

Vinita Saxena 2I

Solids don't react in solution and liquids don't dissociate enough to change the reaction, so they don't count in the k equations

Vinita Saxena 2I

An inert gas doesn't react with the reactants so it does not change the concentration or the reaction in any way since it also does not change the volume.

Vinita Saxena 2I

Yes, the only inert gases are noble gases

Vinita Saxena 2I

It is mostly graded on completeness, check with your TA for how they specifically grade it.

Vinita Saxena 2I

By adding an inert gas you aren't changing the concentration of the reactants or products, they are the same amount in the same volume, so since the concentration is the same there is no reaction.

Vinita Saxena 2I

The values will not be the same but they will be equal to the same thing after some converting.

Vinita Saxena 2I

If it is greater than 10^-3 but less than 1 it slightly favors the reactants, but not strongly.

Vinita Saxena 2I

Q changes based on where the reaction is, whereas K does not change except when temperature changes.

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