CHEMISTRY COMMUNITY

Gisselle Sainz 2F

Water is not included in a cell diagram

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A more positive Ecell is more spontaneous and, therefore, more favorable.

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At constant pressure

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Usually a problem will explicitly mention something as an ideal gas so we most likely won't need to identify it on our own.

Gisselle Sainz 2F

Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel:
Fe - Fe
/ \
Fe Fe
\ /
Fe - Fe

Gisselle Sainz 2F

Do you have mole problems? If so, call Avogadro at 602-1023

Gisselle Sainz 2F

Did you hear oxygen went on a date with potassium?
It went OK.

Gisselle Sainz 2F

A proton and a neutron were walking down the street. The proton says, "Stop, I dropped an electron. Help me look for it." The neutron asks, "Are you sure?" The proton replies, "Yes, I'm positive."

Gisselle Sainz 2F

Why was the mole of oxygen molecules excited when he left the singles bar? He got Avogadro's number!

Gisselle Sainz 2F

A neutron walks into a shop and says,"I"d like a coke."
The shopkeeper serves up the coke.
"How much will that be?" asks the neutron.
The shopkeeper replies, "For you? No charge."

Gisselle Sainz 2F

When work is done on the system, work is positive.
When the system does work, work is negative.

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A HUG without "U" would be toxic

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Probably Wednesday

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Every dipole has its moment

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What is a cation afraid of? A dogion.

Gisselle Sainz 2F

Thank you

Gisselle Sainz 2F

Is 101.325 J/ (L. atm) used to convert L.atm to Joules? Where did this proprotion come from?

Gisselle Sainz 2F

Any variable that can be measured by subtracting the amount of its initial state from the amount of its final state

Gisselle Sainz 2F

Thank you

Gisselle Sainz 2F

How can we identify whether something is a salt?

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Will we be tested on salts this week?

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I think so..

Gisselle Sainz 2F

The order of the pages are accidently reverse on my post. The last photo is the first page of notes and so on..

Gisselle Sainz 2F · Re: Lecture notes These are the notes from Friday 01/18/19

These are the notes from Friday 01/18/19

Gisselle Sainz 2F

Did you hear about oxygen’s date with potassium?
It went OK.

Gisselle Sainz 2F

Did you hear the one about cobalt, radon, and yttrium?
It was CoRnY.

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Q: What do you call a wheel made of iron?
A: A ferrous wheel.

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Q: Why do chemists enjoy working with ammonia?
A: Because it's pretty basic stuff.

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Q: What do you call a tooth in a glass of water?
A: One molar solution.

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Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe

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Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" -- and he died.

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I got 0.00192 atm, 0.0137 atm, and 0.0237 atm as my answers but they're aren't exactly any of the answer choices listed. Why would my answers be two decimal points off?

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How do you solve for the partial pressures in this problem?

Gisselle Sainz 2F

I personally like to go to the UA sessions, AAP peer learning sessions, watch the online modules, and assigned problems from the textbook

Gisselle Sainz 2F

Wanna hear a joke about potassium? K.

Gisselle Sainz 2F

Since Kc is always constant at the same temperature, considering how K is equal to the concentration of products over the concentration of reactants, if we increase [P] then [R] is also increased naturally in order to maintain the same equilibrium constant.

Gisselle Sainz 2F

After doubling the molarity, I still didn't get the right answer.

Molarity= (.550/.21)= 2.62 x 2 = 5.24

and 14 minus the negative log of that doesn't result in the correct answer. I'm not sure what's wrong.

Gisselle Sainz 2F

How do we write the formulas for conjugate acids and bases?

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How do we determine by looking at the pictures which isomers form chelates?

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Why is the interaction energy between ions and molecules always written as a negative value??

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After drawing our molecular models how do we determine its three-dimensional shape?

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I don't quite understand how to determine whether there must be, may be, or cannot be lone pairs in a central atom by being given its angle. Can someone explain?

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I was adivised in the past if no significant figures are given within the problems to just use three sig figs in the answer.

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Intensity contributes to the # of electrons removed ONLY if the light source has reached the threshold energy. The overall idea is that increasing intensity of light does not increase the energy of emitted electronics.

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I believe electron affinity is the amount of energy released or used when an electron is added to an atom.

Gisselle Sainz 2F

When n=2 l= 0, 1 ml= -1,0,1 The # of ml values are used to represent how many orientations or # of orbitals there can exist. Since there are 3 ml values, this tells us that there are 3 orientations in which the p-orbitals exists. This is denoted by px, py, and pz. Px intersects the x-axis of a three...

Gisselle Sainz 2F

You can add a double bond to the NO structure to stabilize the formal charge, but this wouldn't be resonant to the single bond structure b/c a double would transform the structure completely.

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The type of orbital (s, p, d, f for instance) will let you know how many orbitals there are within different subshells.
There is 1 orbital for s
3 for p
5 for d
7 for f

Gisselle Sainz 2F

Why exactly can't heisenberg's principle be applied to everyday objects?

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Has the link for the practice midterm been posted yet?

Gisselle Sainz 2F

Yes everything has a wavelength, but wave properties can only be detected for microscopic particles. The wavelengths of macroscopic objects do exist, but they are regarded to be very small and negligible according to De Broglie's equation. In De Broglie's equation, if you divide Planck's constant by...

Gisselle Sainz 2F

How exactly do we attach images to posts here on chemistry community?

Gisselle Sainz 2F

Essentially, the coefficients that are used in electron configurations are meant to represent the energy level of the orbitals containing the specific number of electrons within a unique periodic element. In this case, The number 4 would indicate the electrons' energy level (n=4) location. The perio...

Gisselle Sainz 2F

For this problem would we consider the ultraviolet's energy level of n=1 (Lyman's series) as the final energy level (n, final) or as the initial energy level (n, initial)?

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This may seem like an odd question, but why exactly don't macroscopic objects have wavelike properties? What is it about microscopic particles that enables them to have this distinct quality?

Gisselle Sainz 2F

multiply (m) by 10^9 to get (nm)

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You would need to use DeBroglie's Equation (wavelength= h/(mass x velocity)) 1) Convert 5.15 ounces to grams (which will be the mass to plug into the equation) 2) Convert mph to meters per second (which will be the velocity to plug into the equation) 3) Plug in all converted variables into Debroglie...

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I believe the test will cover up to section 1.5, if I'm not mistaken. Basically, all of the quantum material we've learned up until DeBroglie's Equation.

Gisselle Sainz 2F

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 1015 s-1 before it can emit an electron from its surface. I

f molybdenum is irradiated with 194 nm light, what is the maximum possible kinetic energy of the emitted electrons?

How do we solve for this?

Gisselle Sainz 2F

The textbook states, "If the energy of the photon is LESS THAN the energy required to remove an electron from the metal, then an electron will not be ejected, regardless of the intensity of the radiation" (pg 12) and "[electrons will be ejected when the photon energy is greater than t...

Gisselle Sainz 2F

When finding the energy PER MOLE of photons, why does it make sense to multiply by avogadro's number?

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If idealistically no true black bodies exist in nature, what is the significance of learning about them?

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If idealistically no true black bodies exist in nature, what is the significance of learning about them?

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This could be an interesting question to ask for the next lecture since we just barely touched upon this topic.

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Either format is fine. They all mean the same thing.

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To go from molecular to empirical formula you divide the subscripts of the molecular formula by the greatest common divisor to get the most reduced form of the formula which is essentially the empirical formula.

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Whether you choose to round or not you should still end up with an answer relatively close to what is correct. I do not think it matters all too much.

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Hertz is number of cycles per second

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If I'm not mistaken, I believe the chemical equation should be
Cu(NO3)2 + 2 NaOH ---> Cu(OH)2 + 2 NaNO3

Gisselle Sainz 2F

Epsom salts consist of magnesium sulfate heptahydrate.
a) how many atoms of oxygen are in 5.15 g of Epsom salts?

How do we solve this?

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