CHEMISTRY COMMUNITY

WUng_1D

I doubt we need to know the formula for formic acid, Lavelle will most likely give us the formula for it

WUng_1D

Can someone explain how to the part where it has us identify the composition of each bond. In the image I don't understand why one oxygen's hybridization is 2sp2 while another is just sp3. Why does the 2 disappear? https://imgur.com/a/eqjr8LV Edit: Not sure how to upload pictures so here is the link...

WUng_1D

When doing the marshmallow problems it asked us to name a compound with cyanide in it. They used cyano though instead of cyanido, which method is the correct way to name it on the test.

WUng_1D

What is the difference between nitrito and nitro? Looking at Lavelle's ligand names sheet both of them are called nitrito using the new IUPAC name convention. Except one has a -kN suffix and the other has a -kO suffix. Overall how do I recognize the difference between the two even though they are th...

WUng_1D

For question 6C.19 it asks between HF or HCl, which is the stronger acid. I've already checked the answer and see that HCl is the stronger acid, but conceptually I do not understand why. Their explanation is that due to HCl having a weaker bond strength than HF, it is the stronger acid. Can someone ...

WUng_1D

Hybridization state of coordination compounds is based on the coordination number. Coordination numbers are number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbors in a complex or coordination compound. For example, if the coordination number is 4 then your hybr...

WUng_1D

Wendy Perez 3A wrote:In a neutralization reaction, acids and bases always produce salt and water.

Where does the water come from in the reaction between ammonia and phosphoric acid then?

WUng_1D

I went about this question mainly looking at the periodic table. You just need to recognize that metals generally form basic oxides, nonmetals form acidic oxides, and metalloids form amphoteric oxides. So in this problem sulfur is a nonmetal and therefore would form an acidic oxide. As for arsenic, ...

WUng_1D

Yes, zinc would be the conjugate base. Although we are not familiar with the compound, I think Lavelle just wants us to understand the formation of salts. We don't need to memorize all of the bases and acids because that would be absurd. Just recognize which would be the conjugate acid or base and a...

WUng_1D

Do acid and base reactions, a neutralization reaction, always produce water?

I am looking at the reaction between ammonia and phosphoric acid and I am not sure where the water would come from (Question J.9 part B)

WUng_1D

You can compare the strengths of acids and bases by how much a molecule is protonated or deprotanated.

WUng_1D

I think it depends on the reaction because we can tell something is an acid if they are a proton donor while a base is a proton acceptor. Knowing this you would have to see whether the salt is giving away its proton or accepting it.

WUng_1D

Weak acids and weak bases only ionize partially. Therefore, when they are mixed, it generally results in a reversible reaction with the formation of a conjugate acid and a conjugate base as products.

WUng_1D

If the complex has an overall negative charge, an anionic complex, the suffix -ate is added to the stem of the metal's name. Additionally, if the symbol of the metal originates from a Latin name,then the Latin stem is used.

WUng_1D

Why does cyanide turn into cyano instead of cyanido?

WUng_1D

It goes to the oxygen because it is more electronegative, the radical thus ends up on the carbon which has a formal charge of 0 with a single lone electron.

WUng_1D

For question 6B.5 it states... Calculate the pH and pOH of each of the following aqueous solutions of a strong acid or base: (a) 0.0146 m HNO3(aq); (b) 0.11 mHCl(aq); (c) 0.0092 m Ba(OH)2(aq); (d) 2.00 mL of 0.175 m KOH(aq) after dilution to 0.500 L; (e) 13.6 mg of NaOH dissolved in 0.350 L of solut...

WUng_1D

How can you tell if an oxide is basic, acidic, or amphoteric

The problem i'm working on is 6A.17
State whether the following oxides are acidic, basic, or amphoteric: (a) BaO; (b) SO3; (c) As2O3; (d) Bi2O3-.

WUng_1D

Hybridization is the idea that atomic orbitals fuse to form newly hybridized orbitals, which in turn, influences molecular geometry and bonding properties. Hybridization is also an expansion of the valence bond theory.

WUng_1D

I would think it is because Aufbau principle applies still where electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels.

WUng_1D

A polar molecule is a molecule with a nonzero dipole moment while a nonpolar molecule is a molecule that has no electric dipole moment.

Simply look for dipole moments and see which way they go, depending on the molecule they will either cancel each other out or won't.

WUng_1D

There are two lewis structures for N2O, the first one has N as the central atom and a triple bond connecting it to the other N molecule and a single bond connecting the oxygen molecule. As for the second lewis structure, N is the central atom again but there are double bonds connecting both the seco...

WUng_1D

How do radicals affect bond shapes, is it considered another region of electron density?

WUng_1D

For questions 2E.1 part b it asks...
Below are ball-and-stick models of two molecules. In each case, indicate whether there must be, may be, or cannot be one or more lone pairs of electrons on the central atom.

How is it possible for a linear molecule to have lone pairs?

WUng_1D

If the difference in electronegativity for the atoms in a bond is greater than 0.4, we consider the bond polar. If the difference in electronegativity is less than 0.4, the bond is essentially nonpolar. If there are no polar bonds, the molecule is nonpolar. When drawing just look for the dipoles and...

WUng_1D

Account for the following observations in terms of the type and strength of intermolecular forces. (a) The melting point of solid xenon is -112 C and that of solid argon is 2189 C. (b) The vapor pressure of diethyl ether (C2H5OC2H5) is greater than that of water. (c) The boiling point of pentane, CH...

WUng_1D

Which of the following molecules are likely to form hydrogen bonds: (a) PH3; (b) HBr; (c) C2H4; (d) HNO2?

How can I tell which molecules are more likely to form hydrogen bonds.

WUng_1D

I like to think of it as oxygen is more willing to give up its electrons in order to attain a half full shell of electrons which is why it will require less energy to remove the electron.

WUng_1D

If a molecule is completely symmetric, then the dipole moment vectors on each molecule will cancel each other out, making the molecule nonpolar

WUng_1D

Generally atoms with polarizing power are the ones that cause large distortions in highly polarizable atoms ions. Atoms/ions that are able to do this are small cations since they want electrons and additionally due to their small size are able to hold on to their electrons more strongly. So when loo...

WUng_1D

Metallic elements generally have properties intermediate between those of metals and nonmetals such as silicon and boron. Nonmetals on the other hand do not exhibit metallic properties. They are gases located generally in the upper right hand corner of the periodic table.

WUng_1D

Yes you should use the energy of photon formula, so for part A you would convert the given wavelength to meters in order to plug it into the equation E=hc/lambda. Then for part B you convert the mass of the sodium atoms into atoms of sodium through dimensional analysis. You would turn the mg to gram...

WUng_1D

I know that the most ideal structures are the ones with minimal formal charges. How do I recognize if there is a more stable structure while drawing the lewis structures. Additionally if asked to draw a lewis structure, would I get points marked off if I don't draw the most stable one.

WUng_1D

I understand that when a transition is in the Lyman series or Balmer series, n will equal either 1 or 2. In the problem I was working on (1A.15) we know it is the Lyman series so n should equal 1. How do I know whether this n is the inital or final energy level though? I'm not sure if I solved it ri...

WUng_1D

I was doing a problem where it asked for the amount of valence electrons in each ion, in this case the ion was Co^3+. I originally was taught the first shell can have 2 electrons, the second shell can have 8 electrons, then the third shell can have 8 electrons. When I looked up the amount of valence...

WUng_1D

When drawing the arrows for the orbitals, why do we have the draw the arrows going up first and then the arrows going down after

WUng_1D

In terms of e- config, it does not change. Atoms bond to try to achieve full octets (full orbital shells). When atoms bond they instead reconfigure their orbital shells into hybrid orbitals sp3 sp2 sp to create bonds.

WUng_1D

For this question I was wondering how the charges on the elements of this question affect ionic radium. Will the extra electrons influence the radium at all?

Place the following ions in order of increasing ionic radius: S^2-, Cl^-, P^3-

WUng_1D

Hi can someone explain to me how to start, thank you! (part d is omitted)

For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will be removed to form the 1 1 ion: (a) Zn; (b) Cl; (c) Al; (d) Cu.

WUng_1D

Can someone explain to me why an element such as Scandium ([Ar]3d14s2) has the 3d orbital come before the 4s orbital?

WUng_1D

You would first have to use Heisenberg's Indeterminacy Equation which is... Delta p * Delta > or = to h/(4pi) We can plug in 350 pm as our delta X, uncertainty in position, since it is given to us, we would first change it to 3.50 x 10^-10 m in order to get the proper units. Now we solve for delta p...

WUng_1D

I believe as long as you work on any questions from the Quantum World unit, it won't matter which questions you do. You just can't work on previous units despite having an earlier discussion.

WUng_1D

From my understanding constructive interference is when two waves of the same wave length interact to create a bigger wave than the original. While destructive interference is when waves are not perfectly aligned, the resulting combined wave will have crests shorter than the original wave. In regard...

WUng_1D

A lamp rated at 32 W (1 W = 1 J*s^-1) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

I'm having difficulty starting this problem, I'm not sure which formula I should use.

WUng_1D

For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will be removed to form the 1+ ion: (a) Ge; (b) Mn; (c) Ba; (d) Au. Does removing an electron from the element bring the element down an entire unit, or can it stay in the same orb...

WUng_1D

They are diatomic because they always exist in this form in real life, you will never find oxygen or any of the other diatomic elements.

WUng_1D

I doubt there would be a situation where there is no given number making it impossible to calculate the amount of sig figs, however you can use real life logic to figure out the amount of sig figs. For example if we were dealing with people then you would not be using any decimals.

WUng_1D

Percent yield is actual yield/theoretical yield, actual yield will always be given because it the real life results of an experiment while theoretical yield is what we find using stoichiometry.

WUng_1D

Most times the states of matter will just be given to you however, certain factors can indicate the state such as the type of reaction (combustion reaction) would need oxygen which is always a gas.

WUng_1D

When balancing an equation do the states of matter affect how balancing equations occur? For example in a combustion reaction there are ashes or smoke that is released so, are those taken into account when writing out equations?

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