CHEMISTRY COMMUNITY

rachana_korapati3C

Can we find equilibrium composition for a set of reactions using Gibbs minimization method?

rachana_korapati3C

why do strong acids not have equilibrium constants? is it because the acid dissociates completely?

rachana_korapati3C

do salts affect the pH of a solution? how can we identify them as salts?

rachana_korapati3C

They're not included because they do not affect the reactant amount at equilibrium in the reaction, so they are disregarded and kept at 1.

rachana_korapati3C

Unless it says otherwise, we should be using Kelvin, and converting other units into Kelvin

rachana_korapati3C

I don't think you can tell whether a reaction is exothermic or endothermic by the equation alone. You have to either measure the heating to cooling or know enough about similar types of reactions.

rachana_korapati3C

rachana_korapati3C

I know that we get our physical tests back in the second week of winter quarter

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rachana_korapati3C

As electron density of the O—H bond decreases, the bond becomes more polar. As the O—H becomes more polar, the oxoacid more readily dissolves in water. Therefore, acid strength increases as the number of oxygen attached to the central atom increases.

rachana_korapati3C

The polarizability of an atom increases the bigger the anion it is. The polarizing power of an atom increases the smaller the cation it is.

rachana_korapati3C

I'm pretty sure we don't use a prefix to identify one molecule. I'm pretty sure the first prefix we use is bis-.

rachana_korapati3C

The ligand is also the same as the Lewis base in any given molecule, and the central atom is almost always the Lewis acid

rachana_korapati3C

VSEPR theory states that the electron pairs in the valence shell of an atom arrange themselves in such a way that repulsions among them are minimized and this arrangement of the electron pairs determines the shape of a particular molecule. Hybridization is the intermixing of a particular number of a...

rachana_korapati3C

Are A-H bonds stronger than AO-H bonds?

rachana_korapati3C

Q: Why shouldn't you believe anything alcohol says?
A: 'Cause alkyl ha-lide

rachana_korapati3C

Q: What did the pregnant scientist say at the end of her electrolysis experiment?
A: "My water broke."

rachana_korapati3C

What is inductive effect? And how does it relate to electronegativity?

rachana_korapati3C

dipole moments refer to the distribution of electrons between two bonded atoms, normally between a polar and nonpolar bond. molecules with a net dipole moment are polar molecules. if the net dipole moment is zero or very small, the bond and molecule are considered to be nonpolar. atoms that have sim...

rachana_korapati3C

Q: did you know proton's have mass?
A: i didn't even know they were catholic...

rachana_korapati3C

I would tell another chemistry joke...
... but all the good ones Argon

rachana_korapati3C

The different bonds all essentially represent the same thing all they show is the 3D model of the molecule and how the atoms are all in different planes.

rachana_korapati3C

You would need to first draw the lewis structure for the compound, and then see how many bonds the molecule has and how many lone pairs the central atom as. Depending on that final number, you can determine the shape and the corresponding bond angle.

rachana_korapati3C

math is an enforced co requisite so you would have to take a 3B, 31B, or LS30B the quarter before you take 14B or at the same time you take 14B

rachana_korapati3C

How would you define a radical?

rachana_korapati3C

From counting up all the lone pairs and bonds, you can calculate the total number of valence electrons for the compound. In this case, there are 32 VE. The diagram shows you how many Cl and O atoms are in the compound, so using that you can calculate the number of VE that come from those two atoms. ...

rachana_korapati3C

I heard they're all going to be the same so it won't necessarily matter which lecture you decide to go to. You could always ask friends in other lectures for their notes as well if it's different!

rachana_korapati3C

The number of protons is the same as the number of electrons if the atom is neutral and not charged. The number of valence electrons is based off of the group number the element is in.

rachana_korapati3C

Electrons gain energy and become less stable as they move away from the nucleus. As it quantum number increases, the electron gains/absorbs energy from surroundings, which is also known as absorption of energy.

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Sulfur is one of the exceptions to the octet rule. Sulfur is able to hold more than eight electrons due to its bonding. It's also a third period element which means the d sub level exists, and it has five d orbitals. Therefore, the additional d orbitals can accommodate for more electrons.

rachana_korapati3C

lavelle mentioned that we will not be asked to draw the orbital shapes on our tests

rachana_korapati3C

No, percentages do not count at sig figs.

rachana_korapati3C

The main difference between the two is their energy levels. Molecular spectroscopy looks at the interactions between electrons in the outer valence shell and electromagnetic waves, which change based off of the structure and composition of the molecule. Atomic spectroscopy is only concerned with the...

rachana_korapati3C

to solve for minimum uncertainty you would use the uncertainty principle which is x=1/2(h/mv). the final answer should be x = 1.3 x 10^-36 m

rachana_korapati3C

a) 5d, five
b) 1s, one
c) 6f, seven
d) 2p, three

rachana_korapati3C

if i remember correctly on the first day of class he said he doesn't bruin cast his lectures unfortunately

rachana_korapati3C

The compound XCl2(NH3)2 can be formed by reacting XCl4 with NH3. Suppose that 3.571 g of XCl4 reacts with excess NH3 to give Cl2 and 3.180 g of XCl2(NH3)2. What is the element X?

I've been having trouble balancing the equation and identifying the mass of X?

rachana_korapati3C

the final balanced equation should be Fe3Br8 + 4Na2CO3 --> 8NaBr + 4CO2 + Fe3O4

rachana_korapati3C

the rule states that if there is an Absence of a decimal point, you start counting from the right side of the number, and if there is a Presence of a decimal point you start counting from the left side of the number to determine how many significant figures there are overall.

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