Search found 29 matches

by Maya Khoury
Wed Jun 13, 2018 12:15 pm
Forum: Bronsted Acids & Bases
Topic: HW J.5
Replies: 1
Views: 166

HW J.5

For J.5 (a), why is HF in the reactants not broken down into its separate ions H+ and F-?

and for (b) can someone explain how the product becomes (CH3)3NHO3?
by Maya Khoury
Wed Jun 13, 2018 10:56 am
Forum: Dipole Moments
Topic: 6.19c [ENDORSED]
Replies: 1
Views: 129

6.19c [ENDORSED]

what does the surface area of a molecule have to do with the boiling point and therefore the intermolecular attractive forces on that molecule?
by Maya Khoury
Wed Jun 13, 2018 10:40 am
Forum: Dipole Moments
Topic: london forces
Replies: 7
Views: 291

london forces

based on homework problem 6.1, every substance had london forces. Is this true for essentially any substance we'd encounter?
by Maya Khoury
Sat Jun 02, 2018 2:18 pm
Forum: Dipole Moments
Topic: Dipoles [ENDORSED]
Replies: 2
Views: 206

Re: Dipoles [ENDORSED]

could someone remind me the rules of what dictates something as ionic, covalent, polar, and non polar? And how do we identify molecules as each without knowing their exact electronegative values?
by Maya Khoury
Sat Jun 02, 2018 2:09 pm
Forum: Dipole Moments
Topic: 6.1 and 6.19 question
Replies: 3
Views: 173

Re: 6.1 and 6.19 question

so how can you tell which has a greater london force? Is it solely based on the mass of the molecule? could someone explain the logic behind the answer for 6.19 (b)?
by Maya Khoury
Sat Jun 02, 2018 1:50 pm
Forum: Dipole Moments
Topic: HW 6.1
Replies: 3
Views: 171

HW 6.1

Why is (b) CBr4 classified as only having london forces?
by Maya Khoury
Sun May 27, 2018 9:51 pm
Forum: Lewis Structures
Topic: Central atom and octet rule?
Replies: 12
Views: 498

Re: Central atom and octet rule?

central atoms can have an expanded octet, less than an octet, or an odd number of electrons! an example of the exception with odd number of electrons would be the molecule nitrous oxide (NO) which has 11 total electrons. oxygen would have 6 lone pair electrons plus the single bond electrons, while n...
by Maya Khoury
Sun May 27, 2018 9:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: HW 3.57 [ENDORSED]
Replies: 2
Views: 219

Re: HW 3.57 [ENDORSED]

the most electronegative element is going to have the negative charge. I found this online: The more electronegative atom has a partial negative charge, d-, because the electrons spend more time closer to that atom, while the less electronegative atom has a partial positive charge, d+, because the e...
by Maya Khoury
Sun May 27, 2018 9:38 pm
Forum: Lewis Structures
Topic: HW 3.39
Replies: 3
Views: 138

Re: HW 3.39

okay this makes a lot of sense! could someone explain how by looking at the periodic table you know what elements are generally anions or cations? and how can you tell if they're 1+ or 3+ for example?
by Maya Khoury
Sun May 20, 2018 4:03 pm
Forum: Bond Lengths & Energies
Topic: Test 3
Replies: 8
Views: 237

Re: Test 3

I guess my main question is up until what lecture do we have to know for test 3? like does that include may 14th and 18th's content?
by Maya Khoury
Sun May 20, 2018 3:09 pm
Forum: Bond Lengths & Energies
Topic: Test 3
Replies: 8
Views: 237

Test 3

Hi, does anyone know if we need to know Covalent Bond Lengths and Strengths for Test #3? This is the part of the homework that's 3.85-3.92

thank you!!
by Maya Khoury
Sat May 19, 2018 3:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: HW 3.57 [ENDORSED]
Replies: 2
Views: 219

HW 3.57 [ENDORSED]

We did this problem in my section, and my TA said the most electronegative would have the negative charge, and I just wanted to clarify this concept. so for perchlorate ion ClO₄- if you calculated Cl to have a negative charge you would know that is wrong because Oxygen is more electronegative correct?
by Maya Khoury
Sat May 19, 2018 3:52 pm
Forum: Lewis Structures
Topic: HW 3.39
Replies: 3
Views: 138

HW 3.39

3.39 asks you to draw the lewis structures for (a) ammonium chloride, (b) potassium phosphide, and (c) sodium hyphoclorite My first question is will we be expected to know the empirical formula for these on our own? And secondly, for part a for example, why in the lewis structure does NH₄ have a pos...
by Maya Khoury
Sat May 19, 2018 3:08 pm
Forum: Lewis Structures
Topic: HW 3.37
Replies: 2
Views: 102

HW 3.37

The answer in the solutions manual says "Therefore, E must be a member of the nitrogen family and since it is a third period element, E must be phosphorous". Can someone explain this to me?
by Maya Khoury
Sun May 06, 2018 1:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.39
Replies: 2
Views: 93

HW 2.39

So could someone just explain to me for homework problem 2. 39 how by looking at the electron configurations, you can tell if the atom is in ground state or an excited state?
by Maya Khoury
Sun May 06, 2018 1:00 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.31 [ENDORSED]
Replies: 5
Views: 192

Re: HW 2.31 [ENDORSED]

okay I get it now, so this might be a really silly follow up and I don't know if this will make sense but stick with me here lol

so the f block, extends out from the d block right? So if d starts at n= 3 (like 3d¹⁰), does f start at n= 5 and can either be 5f or 6f?
by Maya Khoury
Sun May 06, 2018 12:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.29 [ENDORSED]
Replies: 4
Views: 206

HW 2.29 [ENDORSED]

2.29 asks 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 So I understand that for (a) there can be 6 electrons and for (c) there can be 8 electrons, but I don't fully understand why there can be 2 e...
by Maya Khoury
Sun Apr 29, 2018 1:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: n, l, ml (relates to 2.19)
Replies: 2
Views: 96

n, l, ml (relates to 2.19)

So I understand that n is related to the size and energy of the orbital, l is related to the orbital's shape, and ml is related to its orientation in space, but how are they related? Like how would I have information on one of these quantum numbers and know the other quantum number values? Like take...
by Maya Khoury
Sun Apr 29, 2018 1:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.31 [ENDORSED]
Replies: 5
Views: 192

HW 2.31 [ENDORSED]

2.31 asks which of the following subshells cannot exist in an atom: (a) 2d cannot exist (b) 4d exists (c) 4g cannot exist (d) 6f exists

First off, I don't really understand this.
Second, for c, does a g orbital even exist??

okay that's all thank you
by Maya Khoury
Sun Apr 29, 2018 12:55 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.19
Replies: 2
Views: 124

HW 2.19

2.9 (a) How many values of the quantum number l are possible when n=7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with n=4? I only understand part a, can...
by Maya Khoury
Sun Apr 22, 2018 3:00 pm
Forum: DeBroglie Equation
Topic: Post-Assessment #34 [ENDORSED]
Replies: 5
Views: 171

Re: Post-Assessment #34 [ENDORSED]

I attached a picture below of me trying to find the speed for this problem but for some reason i always end up with a ridiculously large number. Can someone tell me what I'm doing wrong? I'm sure it's a stupid mistake lol

thank you !
by Maya Khoury
Sun Apr 22, 2018 2:42 pm
Forum: DeBroglie Equation
Topic: 1.39 and 1.23
Replies: 3
Views: 129

1.39 and 1.23

For 1.39 in regard to test #2, will we be expected to use dimensional analysis and convert mph to meters per second? And also in regard to the test, for 1.23, will we have to know how to convert eV to joules on our own? also the masses of electrons, neutrons, and protons would be given if we needed ...
by Maya Khoury
Sun Apr 22, 2018 2:23 pm
Forum: DeBroglie Equation
Topic: HW 1.33
Replies: 12
Views: 418

Re: HW 1.33

Where does the value for the frequency come from? I tried finding the frequency using the c = Λv but I don't seem to get the value 2.5 x 10¹⁶s⁻¹
by Maya Khoury
Sun Apr 15, 2018 3:51 pm
Forum: Properties of Light
Topic: 1.11
Replies: 2
Views: 95

Re: 1.11

What groups these spectral lines together is their lower energy level. An energy level is a permitted value of the energy in a quantized system such as an atom or a molecule. For example, the Balmer series is a set of lines in the visible light region of the electromagnetic radiation spectrum with t...
by Maya Khoury
Sun Apr 15, 2018 3:32 pm
Forum: Properties of Light
Topic: HW 1.23
Replies: 2
Views: 102

HW 1.23

For problem 23, you have to convert eV to joules, where does the number 1.6022 x 10⁻¹⁹ J*eV⁻¹ come from ?

thank you!
by Maya Khoury
Sun Apr 15, 2018 3:28 pm
Forum: Properties of Light
Topic: HW 1.7 (using nm vs pm)
Replies: 8
Views: 253

HW 1.7 (using nm vs pm)

For problem 1.5, why does the answer manual show that part a is answered in nanometers but part b is answered in picometers? And how would I know when to use which?
by Maya Khoury
Sun Apr 08, 2018 3:25 pm
Forum: Balancing Chemical Reactions
Topic: H. 21
Replies: 4
Views: 231

H. 21

Problem H.21 took me a while to figure out; It asks you to balance the equation of C₁₀H₁₅N + O₂ --> CO₂ + H₂O + CH₄N₂O How would you suggest we start the problem? Is it that we should begin with the element that appears the least frequent in the equation, for example with Nitrogen, and then move up ...
by Maya Khoury
Sun Apr 08, 2018 2:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E. 35
Replies: 1
Views: 147

E. 35

Can someone explain why, when calculating the percentage by which the conversion of hydroxyapatite to fluorapatite increases the mass of the enamel, you divide by the molarity mass of the latter and not the former (fluorapatite)?

Thank you!
by Maya Khoury
Sun Apr 08, 2018 2:30 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.23
Replies: 1
Views: 131

E.23

Can someone explain why in Problem E. 23 part (a) after dividing 3.00 grams by 223.35 g, you multiply by (1 mol Cu²⁺/1 mol CuBr₂)? The question asks for the amount (in moles) of Cu²⁺ ions in 3.00 g of CuBr₂.

Thank you!

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