CHEMISTRY COMMUNITY

FizaBaloch1J

ramayyala1G wrote:I'm pretty sure a proton was transferred around since the hydrogen's are being moved around. What problem is this?

12.9C!

FizaBaloch1J

How do I know there's no proton transferred in this equation? I'm lost because I thought there were protons moving around to different components of the equation?

CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l)

FizaBaloch1J

Chem_Mod wrote:No, for example square planar has 4 atoms attached and 2 lone pairs, but it is nonpolar if all the attachments are the same.

Ah, makes sense! Thank you!

FizaBaloch1J

Will we have to do any calculation problems regarding ACIDS/BASES on the final? Such as calculating pH?

FizaBaloch1J

How do you determine the oxidation state of a coordinate complex?

EX: Na2(PtBr4)

FizaBaloch1J

What does "as the s-character of a hybrid orbital increases, the bond angle increases" mean? Because sp2 = trigonal planar so bond angle is 120, and then when you go up to sp3= tetrahedral so bond angle decreases to 109.5 So my question is what does s-character mean exactly?? Does s-charac...

FizaBaloch1J

If a lewis structure has a lone pair on central atom, does that automatically make the structure polar?

FizaBaloch1J

Lone pairs are counted as 2 electrons, while a single bond is counted as one valence electron when determining formal charge.

FizaBaloch1J

For Hw question 4.5 when drawing the lewis structure for ClO2+ the answer says the arrangement is trigonal planar, but I thought it would be bent because their are 3 "things" connected to the central atom of Cl, one being a lone pair and 2 bonds. So I am confused to how the solution says i...

FizaBaloch1J

When drawing the tetrahedral structure do we have to draw the black triangle or a dashed triangle to represent hydrogen bonds to a central atom for example as showed in some of the solutions in the solutions book (EX: 4.3) or can I just normally draw a straight line as the bond?

FizaBaloch1J

remember, the smaller the atom, the shorter the bond, the stronger the bond.

FizaBaloch1J

According to a UA session, the UA said to know

Cisplatin
- chemotherapy drugs: stops cancer/cell growth
- forms coordination compounds with DNA to stop cell division

Hemoglobin
- transports oxygen in blood
- 4 Myoglobins to bind 4 Oxygen molecules

FizaBaloch1J

Basically, hybridization results from orbital overlap. To figure out the hybridization of an atom, you basically count the "things" (atoms and lone pairs only) surrounding an atom-- not including the central atom. So if there are 2 things surrounding a central atom then its sp. 3 things- s...

FizaBaloch1J

For example, 3.25 A asks to write the chemical formula for magensium arsenide.

For this, how exactly does one go about solving it. Do I look at the individual elements charge separately at first and then balance them? I'm pretty confused.

FizaBaloch1J

Yes, all three of those names can be interchanged with one another since they mean the same thing.

FizaBaloch1J

Isoelectronic means that two or more elements have the same numbers of electrons or the same electronic structure.

FizaBaloch1J

This is because you are trying to find the most stable lewis structure for a molecular formula, and to do this you need to determine the formal charges of each resonance.

FizaBaloch1J

Exactly what the above comment said. Half full and full shells are more stable than ones that are not. Thus, Cr and Cu since they are one away from being half full or full, we go ahead and put their d shell as 3d5 and 3d10 and then take away an electron from their 4s2 to make it 4s1.

FizaBaloch1J

I too like to explain the concepts to people or find pneumonics that can help me try to remember trends for example and why those trends exist

FizaBaloch1J

Which element of each of the following pairs has the higher electron affinity: (a) oxygen or fluorine; (b) nitrogen or carbon; (c) chlorine or bromine; (d) lithium or sodium? Are the trends for electron affinity the same as ionization energy? Decreases down a group, increases across a period (from l...

FizaBaloch1J

Which member of each pair has the smaller first ionization energy: (a) Ca or Mg; (b) Mg or Na; (c) Al or Na? Is this determined by simply looking at the ionization trends? Which is that ionization energy decreases down a group, and increases across a period, so for ... a) because Ca is below Mg, Cal...

FizaBaloch1J

What are all of the electron configuration exceptions we need to be familiar with?

Cu, Cr, and Ag? Are there anymore?

Also, I'm still a little confused on how to do these exceptions, do we just memorize the way they are supposed to be written?

FizaBaloch1J

How do we know how many subshells there are when we are given an n value? For example, "How many subshells are there in the shell with n=4?" Hi, I use this method: subshells are the L (orbital angular momentum), to figure out the L: look at them as levels. Start at 0 and continue writing ...

FizaBaloch1J

Try using the equation KE=1/2 mv^2 You should get the kinetic energy for one hydrogen atom. From there you can use dimensional analysis to calculate the kinetic energy per mole of electrons/hydrogen atoms. How do we "calculate the kinetic energy per mole of electrons/hydrogen atoms" becau...

FizaBaloch1J

I also had a question on how to go about solving this Heisenberg Uncertainty problem. The problem reads... The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in the speed of ...

FizaBaloch1J

I have a question which might be really simple but I am making it more confusing I guess. Under the Heisenberg Uncertainty Online Assessments, if it says the uncertainty in speed is one hundredth the speed of light, what does that look like? (1/100)(3 x 10^8)?

FizaBaloch1J

Was wondering the same thing! ^^^

FizaBaloch1J

^ I have this same question as well.

FizaBaloch1J

When I did this problem to find wavelength I used wavelength= ch/E instead.

FizaBaloch1J

Can someone explain this?

Which of the following increase when the electron in a
hydrogen atom undergoes a transition from the 2s-orbital to a
2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value
of l. (d) Radius of the atom.

FizaBaloch1J

It is the minimum threshold needed to eject an electron from the metal.

FizaBaloch1J

Yeah, just try practicing 8 problems in 40 minutes so you can get a feel for it.

FizaBaloch1J

Yes, that is correct!

FizaBaloch1J

How do you solve this question in the Photoelectric Module? What exactly is the Work function? Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Answer the following three questions. What is the kinetic ene...

FizaBaloch1J

Kuldeep Gill 1H wrote:Hi, I was just wanted to know... to what extent should we know chemical formulas?

For the first test, I am sure he will give us the formula itself so we shouldn't worry too much about that!

FizaBaloch1J

Alondra Juarez section 1E wrote:In Mondays lecture Dr. Lavelle demonstrated the figure of the electric field and described what a wavelength was considered however, I am still confused as to what does amplitude mean in this context is it the height of the wavelength or...?

Amplitude is the height of the wave!

FizaBaloch1J

Had another question regarding question 5 in chapter 1 as well.

Arrange the following types of photons of electromagnetic
radiation in order of increasing energy: -rays, visible light,
ultraviolet radiation, microwaves, x-rays.

How are we supposed to know this? just from the readings?

FizaBaloch1J

Had a question regarding example 3 in chapter 1 as well? Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the elec...

FizaBaloch1J

Does someone have any tips how to balance complicated chemical equations? Some of the ones on the test were not ones you could figure out the numbers for right away. So I was wondering if someone has a helpful method to solve equations like those ones. I would start with looking at the element that...

FizaBaloch1J

Naqiyah Qadir 1I wrote:They are all the same but M (molarity) is given in moles/Liter, correct?

Yes, that is correct!

FizaBaloch1J

Hello! I had a quick question for L1 in the fundamentals section outline.

Without using a calculator, estimate what amount of Br2
(in moles) can be obtained from 0.30 mol ClO2 in the reaction
6 ClO21g2 2 BrF31l2 S 6 ClO2F1s2 Br21l2.

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