Search found 39 matches
- Wed Jun 13, 2018 2:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Worksheet 9 #1
- Replies: 1
- Views: 394
Worksheet 9 #1
why is the answer in the key the most stable lewis structure for NO2, wouldn't having another double bond between N and the other O make all of its formal charges 0 hence more stable?
- Wed Jun 13, 2018 1:41 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: French Toast #25 [ENDORSED]
- Replies: 1
- Views: 395
French Toast #25 [ENDORSED]
How do we find the oxidation state for platinum in [Pt(Cl)2(NH3)2]?
- Sun Jun 10, 2018 9:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating complex
- Replies: 7
- Views: 683
Re: Chelating complex
yes like if its a long string of atoms coming out of two sides of the central atom, you can imagine it would bend and make a chelate if a metal comes and connects each end
- Sun Jun 10, 2018 9:23 pm
- Forum: Properties of Electrons
- Topic: Wave-like Properties of Electron
- Replies: 5
- Views: 651
Re: Wave-like Properties of Electron
where did that number come from, is it just something to know or is there a reason behind it?
- Sun Jun 10, 2018 9:23 pm
- Forum: Octet Exceptions
- Topic: expanded octet
- Replies: 12
- Views: 2655
Re: expanded octet
I know for sure non-metals have expanded octets so definitely not only transition metals. In the review today the TA said anything group 3 and lower can have an expanded octet so I think that's the most important thing to know.
- Sun Jun 03, 2018 10:58 pm
- Forum: Naming
- Topic: Naming on Final
- Replies: 8
- Views: 1096
Re: Naming on Final
no we don't need to know names of molecules, the professor mentioned this in the last class and he said just to ignore that part of book problems, but you're talking about naming molecules right?
- Sun Jun 03, 2018 10:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular vs. VSEPR shape
- Replies: 3
- Views: 346
Re: Molecular vs. VSEPR shape
What do you mean, like the lewis structure?
- Sun Jun 03, 2018 1:14 pm
- Forum: Lewis Structures
- Topic: Test Q.8 [ENDORSED]
- Replies: 7
- Views: 897
Re: Test Q.8 [ENDORSED]
sorry I'm still a little confused about this, can anyone further explain what resonance structures mean for the bond lengths
- Wed May 23, 2018 10:59 pm
- Forum: Lewis Structures
- Topic: Homework Problem 3.59
- Replies: 2
- Views: 295
Re: Homework Problem 3.59
got it!
- Wed May 23, 2018 8:11 pm
- Forum: Lewis Structures
- Topic: Homework Problem 3.59
- Replies: 2
- Views: 295
Homework Problem 3.59
in part a, how do you know that in the lewis structure for ClO, Cl has one lone electron and not O? or does it not matter?
- Wed May 23, 2018 8:01 pm
- Forum: Lewis Structures
- Topic: Homework Problem 3.65
- Replies: 3
- Views: 418
Homework Problem 3.65
i understand the problem, but how are we supposed to know the oxygens get double bonded in the lewis structures?
- Wed May 23, 2018 11:48 am
- Forum: Lewis Structures
- Topic: Homework 3.39 part b
- Replies: 2
- Views: 391
Homework 3.39 part b
b) write the complete lewis structure for the compound potassium phosphide
could somebody explain their work on this question please, I'm having trouble with it
could somebody explain their work on this question please, I'm having trouble with it
- Sun May 20, 2018 10:53 pm
- Forum: Bond Lengths & Energies
- Topic: 3.87
- Replies: 5
- Views: 632
Re: 3.87
can someone also explain how to fully do this question!
- Sun May 20, 2018 10:46 pm
- Forum: Ionic & Covalent Bonds
- Topic: Test 3 [ENDORSED]
- Replies: 7
- Views: 1013
Re: Test 3 [ENDORSED]
i think it'll be clearly stated in the question
- Sun May 20, 2018 10:17 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 557
Re: Sig Figs
basically you can only give an answer with the same amount of sig figs as the number you used in your calculations with the lowest sig figs, this is because if you have a less precise number you can't report a more precise result an example is if you used 4.000(4sf) and 5.0000(5sf) in your calculati...
- Sun May 20, 2018 9:57 pm
- Forum: Lewis Structures
- Topic: Formal Charge
- Replies: 4
- Views: 644
Re: Formal Charge
what works for me is just doing valence electrons - nonbonding electrons - bonding electrons/2
i just try to remember the total you have is the valence, then you remove the lone electrons you used, then the bonding electrons divided by 2 because they're shared
i just try to remember the total you have is the valence, then you remove the lone electrons you used, then the bonding electrons divided by 2 because they're shared
- Tue May 08, 2018 8:25 pm
- Forum: DeBroglie Equation
- Topic: test 2, question5
- Replies: 5
- Views: 792
Re: test 2, question5
I'm not sure, but I got 1.550 x 10^-10m and I got that from (6.626x10^-34Js)/(3.818x10^-26kg)(112ms^-1)
I got 3.818x10^-26kg by multiplying 22.99g Na/1mol Na x 1mol Na/6.022x10^23 x 1kg/1000g
Not 100% I'm right though
Can anyone validate this?
I got 3.818x10^-26kg by multiplying 22.99g Na/1mol Na x 1mol Na/6.022x10^23 x 1kg/1000g
Not 100% I'm right though
Can anyone validate this?
- Tue May 08, 2018 2:53 pm
- Forum: Trends in The Periodic Table
- Topic: 2.81
- Replies: 3
- Views: 483
Re: 2.81
So although the trend is increasing from left to right and down to up for ionization energy, atoms that are stable, meaning either they have all unpaired electrons in their shells or all paired, have a higher ionization energy because when it is stable, it's harder to remove an electron meaning it h...
- Tue May 08, 2018 2:38 pm
- Forum: Trends in The Periodic Table
- Topic: Does Sulfur or Phosphorus have a larger ionization energy?
- Replies: 3
- Views: 13843
Re: Does Sulfur or Phosphorus have a larger ionization energy?
I think phosphorus does have a higher ionization energy because when you look at the shells filled up, sulfur has one pair of electrons and phosphorus has all unpaired electrons. Either all unpaired or all paired makes it stable, so if phosphorus is all unpaired it take more energy to remove an elec...
- Sun May 06, 2018 12:11 pm
- Forum: Limiting Reactant Calculations
- Topic: Test #1 Q. 5
- Replies: 2
- Views: 443
Re: Test #1 Q. 5
I had a different version, but I'm pretty sure the way to do this problem is: 10.0g malrotriose x 1 mol maltotriose/504.437g maltotriose x 18mol O2/1 mol maltotriose x 32g O2/1 mol O2 = 11.42g O2 each denominator for the fractions cancels out the numerator of the previous fraction, so you're left wi...
- Sun May 06, 2018 11:13 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Midterm Review Q5 part f [ENDORSED]
- Replies: 2
- Views: 375
Re: Midterm Review Q5 part f [ENDORSED]
got it thanks!
- Sat May 05, 2018 12:44 pm
- Forum: Photoelectric Effect
- Topic: Midterm Review Q4
- Replies: 2
- Views: 405
Re: Midterm Review Q4
thank you!! (: def helps
- Sat May 05, 2018 12:42 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Midterm Review Q5 part f [ENDORSED]
- Replies: 2
- Views: 375
Midterm Review Q5 part f [ENDORSED]
5. f) How many electrons can have the quantum numbers n=3, l=1?
Why is the answer to this 6?
Why is the answer to this 6?
- Sat May 05, 2018 9:25 am
- Forum: Photoelectric Effect
- Topic: Midterm Review Q4
- Replies: 2
- Views: 405
Midterm Review Q4
4. a) Write an equation using words only that captures the conservation of energy in the photoelectric effect. Describe the conceptual change that arose from the photoelectric experiment and discuss how intensity plays a role. I got the equation, but how do you describe the conceptual change and how...
- Sat May 05, 2018 8:25 am
- Forum: Limiting Reactant Calculations
- Topic: Midterm Review Q2
- Replies: 8
- Views: 4315
Midterm Review Q2
2. Ammonia (NH3) reacts with oxygen (O2) to form air pollutant nitrogen oxide (NO) and water. Determine the theoretical yield of NO if 21.1 g NH3 is reacted with 42.2 g O2.
I missed the first part of the review session, is the answer to this 7.9g NO?
I missed the first part of the review session, is the answer to this 7.9g NO?
- Sat May 05, 2018 7:54 am
- Forum: Limiting Reactant Calculations
- Topic: Homework M12
- Replies: 3
- Views: 550
Homework M12
For part c on homework problem M12, do we find the excess amount of reactant by subtracting the original amount of Al by the amount of Al we get when we convert Fe0 to grams of Al since FeO was the limiting reactant? If this works, are there other ways to find the excess reactant leftover?
- Sun Apr 29, 2018 1:26 pm
- Forum: Photoelectric Effect
- Topic: What is work function? [ENDORSED]
- Replies: 15
- Views: 5632
Re: What is work function? [ENDORSED]
i was confused about this too, so it's just that equation?
- Sun Apr 29, 2018 1:18 pm
- Forum: DeBroglie Equation
- Topic: Test #2: Q5 [ENDORSED]
- Replies: 9
- Views: 1273
Re: Test #2: Q5 [ENDORSED]
looks right to me!
- Sat Apr 28, 2018 11:23 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Why does the 4s orbital come before the 3d?
- Replies: 7
- Views: 1853
Re: Why does the 4s orbital come before the 3d?
the 4s orbitals have lower energy than the 3d orbitals not the other way around, some things online say that s-orbitals are more penetrating than d-orbitals so i think that may be why
- Sun Apr 22, 2018 10:09 pm
- Forum: Balancing Chemical Reactions
- Topic: Q4
- Replies: 3
- Views: 553
Q4
How do you do question 4 on test 1? Writing a balanced equation for the combustion of fluorene.
- Sun Apr 22, 2018 10:02 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1.43
- Replies: 1
- Views: 160
1.43
What is the minimum uncertainty in the speed of an electron confined to within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom.
How do you do this problem i'm having some trouble?
How do you do this problem i'm having some trouble?
- Sun Apr 22, 2018 9:39 pm
- Forum: Balancing Chemical Reactions
- Topic: Help with homework problem L.39 [ENDORSED]
- Replies: 2
- Views: 469
Re: Help with homework problem L.39 [ENDORSED]
got it thanks!!
- Wed Apr 18, 2018 11:49 pm
- Forum: DeBroglie Equation
- Topic: 1.41 [ENDORSED]
- Replies: 3
- Views: 558
Re: 1.41 [ENDORSED]
thanks guys this helped! (:
- Sun Apr 15, 2018 9:01 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Empirical and Molecular Formula [ENDORSED]
- Replies: 6
- Views: 945
Re: Finding Empirical and Molecular Formula [ENDORSED]
I think you count how many of each atom you have for the molecular formula and then simplify that by it's least common denominator.
- Sun Apr 15, 2018 8:16 pm
- Forum: Properties of Light
- Topic: HW chapter 1 question 3
- Replies: 5
- Views: 575
Re: HW chapter 1 question 3
The question asks: Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. a) the speed of radiation decreases b) the wavelength of the radiation decreases c) the extent of the change in the electrical field at a given point decreases d) the ...
- Sun Apr 15, 2018 8:06 pm
- Forum: SI Units, Unit Conversions
- Topic: Avogadro's Number [ENDORSED]
- Replies: 11
- Views: 1337
Re: Avogadro's Number [ENDORSED]
Yes it can be used for both and it does depend on the basic units of the substance.
- Sun Apr 15, 2018 8:03 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Molecular X
- Replies: 9
- Views: 957
Re: Finding Molecular X
What do you mean exactly, could you provide an example?
- Sun Apr 15, 2018 8:01 pm
- Forum: DeBroglie Equation
- Topic: 1.41 [ENDORSED]
- Replies: 3
- Views: 558
1.41 [ENDORSED]
What is the velocity of a neutron of wavelength 100.pm?
Do we have enough info to answer this question?
Do we have enough info to answer this question?
- Sun Apr 15, 2018 7:43 pm
- Forum: Balancing Chemical Reactions
- Topic: Help with homework problem L.39 [ENDORSED]
- Replies: 2
- Views: 469
Help with homework problem L.39 [ENDORSED]
A 1.50g of metallic tin was placed in 26.46g crucible and heated until all of the tin had reacted with the oxygen in air to form an oxide. The crucible and product together were found to weigh 28.35g. a) what is the empirical formula of the oxide? b) write the name of the oxide. I'm pretty confused ...