CHEMISTRY COMMUNITY

Isabel Jabara 1C

What makes BaO basic?

Isabel Jabara 1C

Yes, we will be given the values.

Isabel Jabara 1C

I believe angular is the same thing as bent.

Isabel Jabara 1C

When written this way, the first atom is the element that is bonded to the central metal. The other two after that are bonded to that first atom.

Isabel Jabara 1C

All bonds have one sigma bond. Double bonds have one sigma bond and one pi bond. Triple bonds have one sigma bond and 2 pi bonds.

Isabel Jabara 1C

I think we just need to know if they are considered basic or acidic, but not the exact pH.

Isabel Jabara 1C

We do not need to memorize these.

Isabel Jabara 1C

How do you determine the VSEPR formula with 2 central atoms? For example, in 4.21 D how would you find the VSEPR formula for N2H4?

Isabel Jabara 1C

I believe radicals are not made stable.

Isabel Jabara 1C

ICl4-1 has 36 valence electrons, but if you fill up all the octets there are still 4 left over. I is an exception to the octet rule so you can add lone pairs to it.

Isabel Jabara 1C

If they have the same formal charge overall, choose the one with the smallest individual formal charges. For example, if one of them has -2 and 2, so the formal charge is 0, and the other has all 0's, the one with all 0's is ranked higher.

Isabel Jabara 1C

Yes, we have to draw lewis structures for test 3.

Isabel Jabara 1C

When drawing lewis structures with a central atom that is an exception to the octet rule, how do you know whether to add a double bond or an extra lone pair onto the central atom?

Isabel Jabara 1C

Yes. The overall formal charge for all of them are zero, so you have to look at the formal charges for each individual atom. Then choose the one that has formal charges closest to zero because that one is the most stable.

Isabel Jabara 1C

Write the complete Lewis structure for each of the following compounds: (a) ammonium chloride
I understand how to get the Lewis structure from the chemical formula, but I do not understand how to get the chemical formula of ammonium chloride.

Isabel Jabara 1C

However, although ionization energy and electron affinity are different things, they both follow the same periodic table trends.

Isabel Jabara 1C

Br has 7 valence electrons and O has 6. 7+6=13, add 1 because of the (-) so your total is 14 valence electrons. Br and O share a pair of electrons, so there are 2 dots between Br and O. then there are 2 more dots on each side of Br and O so that the total is 14 dots. Then you put brackets around the...

Isabel Jabara 1C

What is a monatomic ion as in question 3.25?

Isabel Jabara 1C

I think E infinity = 0 is meant to show that the highest energy level is 0, and as you approach n=1 you keep releasing energy, and if you are releasing energy from a value of 0 it must be negative.

Isabel Jabara 1C

On one of the UA's practice tests (Lyndon's), question 7a asked "An excited hydrogen atom undergoes an electronic transition from n=3 to n=1. Calculate the frequency of the photon emitted." Since the question only contains numbers with 1 significant figure, should we answer with only one?

Isabel Jabara 1C

It doesn't matter if you convert mL to L before you solve the problem or after you solve it, as long as you use the same unit the whole time you are solving the problem. Answers are usually given in L, but the UA gave the answer in mL.

Isabel Jabara 1C

A nodal plane is a plane where the probability of finding an electron is zero.

Isabel Jabara 1C

QuincyH1G wrote:whats the opposite?

The opposite, when the peak of one wave corresponds with the peak of another or when the trough of one wave corresponds with another, is called constructive interference.

Isabel Jabara 1C

UV light is used in the Lyman series.

Isabel Jabara 1C

λ = h/p
since p is given and h is a constant, you can solve for λ with that equation. Then you can solve for frequency using λc=v because you know λ and c is a constant.

Isabel Jabara 1C

Someone said this in another answer and I thought it was really helpful:
"An individual light particle is called a "photon." The flow of photons moves in a wave and have wave characteristics light wavelength and frequency."

Isabel Jabara 1C

My TA said that there will be no material from test 1 repeated on test 2.

Isabel Jabara 1C

In example 1.5 in the textbook part c, we are told to set Ek to 0 to find the longest wavelength or radiation that is able to eject an electron, so hv=phi. They then concluded that lambda=ch/phi. How did they get to this conclusion?

Isabel Jabara 1C

Once you calculate the moles of each reactant you have, given that the problem gave you two masses to begin with, you compare the ratios of those moles to the molar ratio provided by a balanced chemical equation. (The molar ratio is given by the stoichiometric coefficients). For example, if the rat...

Isabel Jabara 1C

Usually in the textbook the question does not explicitly state that it should be a limiting reactant calculation. You are expected to know how to interpret the information given to you to find out that it is a limiting reactant calculation. I suggest doing the textbook problems without looking at wh...

Isabel Jabara 1C

Mass percentages should always add up to 100%. If yours don't, maybe you calculated something wrong, or maybe the question did not explicitly give you all the information. For example, if it is a combustion problem, the question might not have given you information about the O2 that is in the reacta...

Isabel Jabara 1C

If you are giving the answer in mL, make sure you label it, but it is usually better to give your answer in Liters.

Isabel Jabara 1C

Could someone explain in more detail the "comparing" part of these steps? I do not understand what you do after you have the two different ratios, how do you compare them to know which is your limiting reagent? Using Allen's example, if you have .349 mol of Na, and the ratio of Na to Cl2 ...

Isabel Jabara 1C

After finding the limiting reactant, you must look at the ratio of the limiting reactant to the product. Since the ratio is 1 mol CaC2 to 1 mol CaC2, the maximum yield of 1.56 mol CaC2 is 1.56 mol C2H2. Then you multiply this by the molar mass of C2H2 which is 26.038 g/mol. 1.56 mol x 26.038 g/mol =...

CHEMISTRY COMMUNITY

Search found 34 matches

BaO [ENDORSED]

Re: 12.49

Re: Bent/angular [ENDORSED]

Re: ligand bonds

Re: pi bonds and sigma bonds [ENDORSED]

Re: pH

Re: Do we need to memorize table 12.2 and 12.3? [ENDORSED]

VSEPR formula with 2 central atoms

Re: Single electron

Re: 3.61

Re: ranking

Re: Test 3

When to use lone pairs or bonds

Re: 3.53

Homework 3.39

Re: Ionization Energy vs. Electron Affinity

Re: BrO- Lewis Structure

monatomic ion

Re: midterm Q.7b [ENDORSED]

How many significant figures? [ENDORSED]

Re: #9 on Midterm Practice Review (unicorn)

Re: Nodal Planes- what are they exactly? [ENDORSED]

Re: Module Question [ENDORSED]

Re: Lyman Series

Re: finding frequency from Einstein's equation [ENDORSED]

Re: Wave and Particle

Re: Test 2 Material

Example 1.5 c

Re: Limiting Reactant

Re: Knowing if it's Limiting Reactions

Re: Mass percentage

Re: Units - L or mL? [ENDORSED]

Re: Limiting Reactant

Re: Limiting Reactant Problems