CHEMISTRY COMMUNITY

Johana Jeon 1A

State whether the following oxides are acidic, basic, or amphoteric:
a) BaO
b) SO3
c) As2O3
d) Bi2O3

Can someone walk me through this problem?
I know that amphoteric means it can act as both acid / base, but I'm confused on how to solve this question
Thank you!

Johana Jeon 1A

Draw the Lewis structure for each of the following species and identify each as a Lewis acid or Lewis base:
a) NH3
b) BF3
c) Ag+
d) F-
e) H-

How do we determine whether it's acid / base, based on Lewis structure?

Johana Jeon 1A

In 12.9: Which of the following reactions can be classified as reactions between Brosted acids and bases? For those that can be so classified, identify the acid and the base. a) NH4I(aq) + H2O(l) --> NH3(aq) + H3O(aq) + I-(aq) b) NH3I(s) --> NH3(g) + HI(g) c) CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) +...

Johana Jeon 1A

Aqueous is included
Only solid + liquid NOT included

Johana Jeon 1A

The reason why the answer is 1/PBCl3^2 is because as stated in page 133 in the course reader, molar concentration of a pure substance (solid or liquid) does not change in a reaction This means that solid + liquid are not included in K expression As you can see in problem A, 2 BCl3(g) + 2 Hg (l) --> ...

Johana Jeon 1A

Thank you so much this was so helpful and cute!

Johana Jeon 1A

https://www.youtube.com/watch?v=Wvkx-S_xR-E

Tetrahedral has a bond angle of 109.5

Johana Jeon 1A

Ch 4 has a lot of molecular orbital theory problems, but Dr Lavelle said we won't go over them since there's not enough time!

Johana Jeon 1A

Here is a link that I found helpful when drawing lewis structures!
Hope it helps

http://myweb.astate.edu/mdraganj/LewisDotanswers.html

Johana Jeon 1A

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

Why is Zn and Cu in the 4s orbital?

Johana Jeon 1A

"In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. What is the energy per photon of light emitted? How many photons of infrared radiation does the lamp generate in 1.0 s?" Can someone walk me through this problem please? I think I go...

Johana Jeon 1A

In the course reader page 65, I'm still not 100% sure as to why e- configuration of chromium is, Cr: [Ar] 3d^5 4s^1 and copper is, Cu: [Ar] 3d^10 4s^1
Why is it not 3d^5 4s^2?
Also when writing e- configurations, what's the oder of orbitals? Is it f-orbital, d-orbital, p-orbital, and then s-orbital?

Johana Jeon 1A

How do we differentiate b/w polar and nonpolar bonds?
Also, do we look at the periodic table and go based off of that?
Thank you in advance!

Johana Jeon 1A

https://www.youtube.com/watch?v=wnLcJH-Heyo This is a short clip explaining quantum numbers, hope it helps!! a) 6 This is because when n=2, l=1 it's a p orbital and we know that p orbitals can hold 6 electrons b) 2 It's 2 electrons b/c the numbers are describing each orbitals and each orbitals can h...

Johana Jeon 1A

It's 8 because n = 2 is s & p orbitals
s can hold 2 + p can hold 6 = 8

Johana Jeon 1A

When you do 1/0.112 it's 8.928571429 which is roughly about 9
Square root of that would be 3

Johana Jeon 1A

When we are not given a molar mass, we can assume there are 100g of the sample. However, since the molar mass was given we can use that to find the actual amounts. Then how come for F.17 we don't need to do it that way? The question is: Osmium forms a molecular compound with mass percentage composi...

Johana Jeon 1A

When we are not given a molar mass, we can assume there are 100g of the sample. However, since the molar mass was given we can use that to find the actual amounts. Then how come for F.17 we don't need to do it that way? The question is: Osmium forms a molecular compound with mass percentage composi...

Johana Jeon 1A

Dr. Lavelle said it's okay to write it as 1s^1 2s^2 2p^3!

Johana Jeon 1A

In 2.67: 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 For b, why isn't nitrogen higher? Doesn't electron affinity increases upward for the groups and from left to right across pe...

Johana Jeon 1A

Yes this is what my TA said, "Although I strongly suggest students use pen, I do allow the use of pencil on tests within certain restrictions. Specifically if a test is is written in pencil then this removes the possibility of an exam regrade if a student feels that the test has been graded in ...

Johana Jeon 1A

I agree with Ben - you need to be able to pace yourself during the exam b/c 50 minutes feels really limiting (esp if there are a lot of parts to each questions) That's why when I study Dr. Lavelle's practice exams / do the work problems from the book, I set the timer to 45 minutes and pretend like I...

Johana Jeon 1A

Thank you guys :)

Johana Jeon 1A

What does it mean for an electron configuration to represent a ground state or an excited state of an atom?
Is it talking about the opposite / same spin?

In 2.39: Determine whether each of the following electron configurations represents the ground state or an excited state of the atom given.

Johana Jeon 1A

In M.21: A compound found in the nucleus of a human cell was found to be composed of carbon, hydrogen, oxygen, and nitrogen. A combustion analysis of 1.35g of the compound produced 2.20g of CO2 and 0.901g of H2O. When a separate 0.500-g sample of the compound was analyzed for nitrogen, 0.130g of N2 ...

Johana Jeon 1A

During his office hour, Dr. Lavelle said mass of electron is always (9.10938 x 10^-31 kg) and this formula will be given in the tests On the first problem, we used 1.50 x 10^3 kg as our mass because it is given in the problem Lastly, we want SI units in m because SI unit for Joules is: kg * m^2 * s^...

Johana Jeon 1A

In 1.37: Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 x 10^5 ms^-1 in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. In 1.41: What is the veloc...

Johana Jeon 1A

Thank you!!

Johana Jeon 1A

In 1.15: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. Question: after getting 0.112, how do we know that n2^2 = 9; n2 = 3?

Johana Jeon 1A

For Exercise 2.29 (Chapter 2 The Quantum Mechanics in Action: Atoms)
How many electrons can have the following quantum numbers in an atom:
a) n = 2, l = 1
b) n = 4, l = 2, ml = -2
c) n = 2
d) n = 3, l = 2, ml = +1

Does anyone know how to solve this problem?
Thank you in advance

CHEMISTRY COMMUNITY

Search found 30 matches

HW: 12.17

HW: 12.13

HW: 12.9

Re: Question 11.13

Re: Question 11.13

Re: Covalent Bonds (video)

Re: Chapter 4 Hw , 4.15A

Re: HW Problem 4.77

More Lewis Structure Problems

Exercise 3.13

Exam 1 - Q4A

Writing e- configurations of atoms

Polar vs. nonpolar

Re: question on hw 2.29

Re: Text Book Problem 2.29 (d)

Re: Exercise 1.15 (Ch 1 : The Quantum World)

Re: Limiting Reactants?

Re: Limiting Reactants?

Re: Electron Configuration

Exercise 2.67

Re: Thoughts after Test 1?

Re: Thoughts after Test 1?

Re: Ground state vs. excited state

Ground state vs. excited state

Exercise M.21

Re: Class Lecture Work Example Question [ENDORSED]

Protons & neutrons

Re: Exercise 1.15 (Ch 1 : The Quantum World)

Exercise 1.15 (Ch 1 : The Quantum World)

Exercise 2.29