CHEMISTRY COMMUNITY

Tony Chung 2I

n is just the number of balanced electrons

Tony Chung 2I

Oxidation loses electrons and reduction gains electrons.

Tony Chung 2I

There are certain elements that have specific charges. You need to know these to properly balance the redox equation.

Tony Chung 2I

You do not need to add them to the cell diagram (-:

Tony Chung 2I

you can ignore x when youre approximating. this is when your k value is less than or equal to 10^-3

Tony Chung 2I

You can use pv=nrt to find one of the constants like n,t,p,or v.

Tony Chung 2I

Balance the entire equation first, and then omit the liquids and solids. This will reduce the chance of you making an error.

Tony Chung 2I

It can change which way the reaction proceeds.

Tony Chung 2I

The system is the thing that you're observing/looking at, while the surrounding is everything else.

Tony Chung 2I

You use the quadratic equation when you can't approximate because of how large the K value is. If the K value is greater than 10^-3, then you would have to use the quadratic formula.

Tony Chung 2I

They should give you the value of k or they'll give you the correct values to solve for k.

Tony Chung 2I

You can do this when your equilibrium constant value is less than 10^-3 because this value is extremely small.

Tony Chung 2I

Le Chatelier's Principle for pressure: if the pressure increases, the reaction will proceed towards the side with less moles of gas. if the pressure is decreased, the reaction will proceed towards the side with more moles of gas.

Tony Chung 2I

The reverse reaction is the inverse. so it would would 1/k

Tony Chung 2I

It's typically for moles, concentration (M), and pressure. You can also start off with moles and then convert it to molarity after. Just make sure that your units are consistent all throughout the ice table.

Tony Chung 2I

it should be mol/L or M. This is the case when they are asking for the concentration.

Tony Chung 2I

That depends on the units that you are given and are working with.

Tony Chung 2I

yes, it is a thing. This will happen when system does work on the surrounding.

Tony Chung 2I

Endothermic: When energy is absorbed from its surroundings. delta H>0
Exothermic: When energy is released. delta H<0

Tony Chung 2I

The values are usually given for the uncommon ones. Highly recommend to memorize the common ones though just to be safe!

Tony Chung 2I

Heat capacity: amount of heat needed to raise the Temp. by 1 degree Celsius
Molar heat capacity: amount of heat needed to raise the Temp. of 1 mole of that certain substance by 1 degree Celsius

Tony Chung 2I

You should also memorize the strong acids and bases that we had to use in 14A

Tony Chung 2I

when they give you the initial value of a weak acid.

Tony Chung 2I

Yes, only if the temperature of the water is at a constant temperature of 25 degrees celsius.

Tony Chung 2I

You can do this by increasing the temperature.

Tony Chung 2I

Water can be a solid, liquid, or gas. However, it cannot be an aqueous solution.

Tony Chung 2I

It's rare because it's not common to have an equal amount of products and reactants.

Tony Chung 2I

The unit for T in this case is always in Kelvin (K)

Tony Chung 2I

you should memorize and the units just in case

Tony Chung 2I

both of the formulas for Q and K are the same!

Tony Chung 2I

I believe so. I recall my TA saying something about it during our discussion

Tony Chung 2I

Based off of what the person above me said, the longer the bond length, the weaker it is

Tony Chung 2I

This is normally given to you in the problem as a molarity

Tony Chung 2I

you typically want the formal charge to be 0

Tony Chung 2I

having a formal charge of 0

Tony Chung 2I

it has a stronger IMF, resulting in a higher melting point

Tony Chung 2I

lone pairs affect the shape

Tony Chung 2I

You can take the average of the two

Tony Chung 2I

I think that the probability of finding that is very low or close to 0

Tony Chung 2I

Drawing the structure is highly recommended when determining the bond angle.

Tony Chung 2I

This is because the lone pairs push away the other atoms resulting in a larger bond angle.

Tony Chung 2I

Electronegativity and electron affinity are different. Electronegativity is how well the electrons are attracted to an atom, and electron affinity is the amount of energy needed to release an electron.

Tony Chung 2I

You cannot determine an element/compound just by using formal charge alone. The formal charge does not have to be zero. If it is zero, that means that it is at its most stable point.

Tony Chung 2I

That is correct. Helium has the highest ionization energy.

Tony Chung 2I

It is because of resonance. Resonance tells us that there is more than one lewis structure for a specific compound.

Tony Chung 2I

Cu and Cr are special cases which means that they have different electron configurations.

Tony Chung 2I

Double bonds are stronger that single bonds. This means that double bonds have a stronger pull, resulting in a shorter length.

Tony Chung 2I

It doesn't matter as long as you put the right amount of dots and bonds.

Tony Chung 2I

It'll be very helpful to go over Lavelle's "outline 2" document on his website.

Tony Chung 2I

I believe I heard during lecture that it is final - initial.

Tony Chung 2I

Always use the amount of sig figs that they give you in the question.

Tony Chung 2I

The Heisenberg uncertainty equation is used to find a particles position and momentum.

Tony Chung 2I

E gives the energy of one photon, v is frequency, and h is planck's constant.

Tony Chung 2I

You can see the similarities through the wave-particle duality. Light has very similar qualities of both wave and particles.

Tony Chung 2I

The equation tells us that E is the energy of light, which is also called a photon.

Tony Chung 2I

It'll probably fall in between the colors blue and green, giving it a cyan color.

Tony Chung 2I

Thank you for giving me the advice that I needed!

Tony Chung 2I

Picture an archer doing target practice. If the archer is relatively hitting the same spot on the target, that would be considered as precise. If the archer is constantly hitting the bullseye, that would be considered as accurate.

Tony Chung 2I

Writing out the units will definitely save you from making mistakes. As the problems get more detailed, writing the units down will be much more beneficial to you.

Tony Chung 2I

I think that it's based off of personal preference. It should not matter which format you write your answer in, unless the question specifically asks you to write it a certain way.

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