Search found 33 matches
- Thu Jun 07, 2018 10:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.21 partc
- Replies: 1
- Views: 329
4.21 partc
For this question, the shape is tetrahedral, yet the bond angles are not 109.5 but 103 degrees. It said this had something to do with the double bond between phosphorous and oxygen. Can someone please explain this further to me. Thanks!
- Thu Jun 07, 2018 9:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.21 a
- Replies: 1
- Views: 324
4.21 a
Why is the answer trigonal planar with 120 degree angles when there are 5 regions of electron density?
- Thu Jun 07, 2018 9:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.19 d
- Replies: 1
- Views: 305
4.19 d
So for 4.19 part d, it says that the shape is trigonal planar with bond angles of 95 degrees. I though that trigonal planar had bond angles of 120 degrees. I know this has something to do with the lone pairs but I don't really understand why. Thanks!
- Sun Jun 03, 2018 10:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular vs. VSEPR shape
- Replies: 3
- Views: 346
Molecular vs. VSEPR shape
In my discussion the molecular shape was discussed and the VSEPR shape. What is the difference? Does it have to do something with the lone pairs?
- Sun Jun 03, 2018 10:38 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate
- Replies: 2
- Views: 477
Chelate
What is a chelate? what does it have to do with ligands?
- Sun Jun 03, 2018 10:37 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand terms
- Replies: 2
- Views: 378
Ligand terms
Can someone please explain to me the significance of what monodentates, bidentates, tridentates, and hexodentates are?
- Sun May 27, 2018 10:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Most covalent or ionic character
- Replies: 3
- Views: 1687
Most covalent or ionic character
What does it mean when something has the most covalent character? most ionic character?
- Sun May 27, 2018 10:16 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid deposition
- Replies: 2
- Views: 914
Re: Acid deposition
This is what I found. Hope it helps. Acid deposition aka Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and ...
- Mon May 21, 2018 9:01 pm
- Forum: Lewis Structures
- Topic: 3.41 part c
- Replies: 4
- Views: 562
3.41 part c
It asks to create the lewis structure of H2C(NH2)COOH. Where would I start? How would I set this up?
- Sun May 20, 2018 10:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Stable lewis structures
- Replies: 2
- Views: 385
Stable lewis structures
So my TA mentioned something about when there is a formal charge of a -1 and a +1, a bond can be added to "even it out". Can someone explain to me why this is? Also Im not sure if I remembered this correctly so sorry if what I said is inaccurate.
- Sun May 20, 2018 10:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Stable Lewis structures
- Replies: 4
- Views: 587
Stable Lewis structures
How do I know when I have found the most stable Lewis structure?
- Sun May 20, 2018 10:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: Significance to the different interactions [ENDORSED]
- Replies: 1
- Views: 302
Significance to the different interactions [ENDORSED]
What is the significance of ion-ion, ion-dipole, dipole-dipole, and dipole-induced dipole? What makes these so important? A quick summary would be very helpful as I am pretty confused. Thanks!
- Wed May 09, 2018 11:28 am
- Forum: Molarity, Solutions, Dilutions
- Topic: question 8 week 5
- Replies: 1
- Views: 419
question 8 week 5
Anhydrous calcium chloride, CaCl2, is a salt which is sued increasing water hardness in swimming pools. A solution of CaCl2 is prepared by dissolving 4.00g of salt to 1.00L water. a) what is the concentration of chloride ions for the above solution? b) The above solution diluted with 1.00L of 0.400M...
- Wed May 09, 2018 11:22 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Question 7 week 5
- Replies: 1
- Views: 603
Question 7 week 5
To prepare a nutrient solution, a nurse dilutes 1.0L of 0.30 M C6H12O6(aq) by adding 4.0L of water. The nurse then adds 100. ml of the diluted solution to an intravenous bag. How many moles of carbon atoms will the IV bag contain?
- Wed May 09, 2018 9:01 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Question 5 from week 5 review
- Replies: 1
- Views: 332
Question 5 from week 5 review
How many orbitals have l=2 and n=3?
Would I just need to find Ml? so would the answer be 5 since Ml= (-2,-1,0,1,2)?
Would I just need to find Ml? so would the answer be 5 since Ml= (-2,-1,0,1,2)?
- Fri May 04, 2018 11:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration for P^3- [ENDORSED]
- Replies: 2
- Views: 383
Electron configuration for P^3- [ENDORSED]
I understand if for something like P^3+ you would need to remove three electrons from the configuration of neutral P, but what do you do when it is P^3- instead of P^3+?
- Mon Apr 30, 2018 9:18 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1.55 part c
- Replies: 1
- Views: 270
1.55 part c
How much energy would be absorbed by 1.00 mol of molecules absorbing at 3600 cm^-1?
For this question you have to multiple the energy of absorption found in part b of the question, to Avogadro's number. Why do I have to do this?
For this question you have to multiple the energy of absorption found in part b of the question, to Avogadro's number. Why do I have to do this?
- Mon Apr 30, 2018 9:14 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1.55 part b
- Replies: 2
- Views: 320
1.55 part b
In this question it is given that absorption occurs at 3600 cm^-1 and asks: what is the energy, in joules, that corresponds to that absorption?
It shows that the equation used is E = (c)(h)(v).
Im just curious as to where this equation came from?
It shows that the equation used is E = (c)(h)(v).
Im just curious as to where this equation came from?
- Tue Apr 24, 2018 4:16 pm
- Forum: Photoelectric Effect
- Topic: homework 1.25 part b
- Replies: 3
- Views: 363
homework 1.25 part b
sodium vapor lamps emit yellow light wavelength 589 nm. How much energy is emitted by 5.00 mg of sodium atoms emitting light at this wavelength The solution to this problem says to convert 5 mg of Na to moles, then use that number and convert to Joules. But how would I know to do this by reading the...
- Tue Apr 24, 2018 3:53 pm
- Forum: Einstein Equation
- Topic: converting from keV to joules
- Replies: 7
- Views: 832
converting from keV to joules
In problem 1.23 we have to convert 140.511keV to joules. Should we worry about memorizing this conversion for the test?
- Sun Apr 22, 2018 7:40 pm
- Forum: Properties of Light
- Topic: week 3 discussion, question 11
- Replies: 2
- Views: 299
week 3 discussion, question 11
There are many other experiments that helped us understand the subatomic world. Describe and explain the implications of: Thompson's cathode ray tube experiments, Milikan's oil drop experiment, Rutherford's platinum foil experiment, and the double slit experiment.
- Sun Apr 22, 2018 7:31 pm
- Forum: Photoelectric Effect
- Topic: Week 3 discussion, question 10
- Replies: 2
- Views: 314
Week 3 discussion, question 10
How did the discovery of photoelectric effect the world's understanding of the physics of quantum scale objects?
- Sun Apr 22, 2018 7:27 pm
- Forum: DeBroglie Equation
- Topic: Week 3 discussion, question 6 [ENDORSED]
- Replies: 2
- Views: 395
Week 3 discussion, question 6 [ENDORSED]
I need help answering this problem:
The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.5x10^3 km/s?
The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.5x10^3 km/s?
- Thu Apr 12, 2018 11:44 pm
- Forum: Properties of Light
- Topic: Speed in vacuum
- Replies: 3
- Views: 767
Speed in vacuum
We were given the equation c= 3.00x10^8m.s^-1 for speed in vacuum. Can someone explain to me what this equation means and what it is for?
- Thu Apr 12, 2018 11:42 pm
- Forum: Properties of Light
- Topic: Frequency and wavelength [ENDORSED]
- Replies: 4
- Views: 511
Frequency and wavelength [ENDORSED]
Does frequency and wavelength have an inverse relationship? and if so, why?
- Thu Apr 12, 2018 11:33 pm
- Forum: Limiting Reactant Calculations
- Topic: actual vs. theoretical yield [ENDORSED]
- Replies: 6
- Views: 1523
actual vs. theoretical yield [ENDORSED]
What is the difference?
- Thu Apr 12, 2018 9:40 pm
- Forum: Significant Figures
- Topic: Sig fifs in 750 [ENDORSED]
- Replies: 6
- Views: 1336
Sig fifs in 750 [ENDORSED]
Does the number 750 have two sig figs? And would the number 750.01 have 5?
- Thu Apr 12, 2018 9:33 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Review worksheet week 1: question 9 [ENDORSED]
- Replies: 4
- Views: 2326
Review worksheet week 1: question 9 [ENDORSED]
What mass of CO is required to react completely with 25.13 g of Fe2O3 according to the equation:
Fe2O3 + 3CO ----> 2Fe + 3CO2
Fe2O3 + 3CO ----> 2Fe + 3CO2
- Thu Apr 12, 2018 9:30 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Review worksheet from week 1, question 8 [ENDORSED]
- Replies: 1
- Views: 1008
Review worksheet from week 1, question 8 [ENDORSED]
What mass of oxygen gas, O2, from the air is consumed in the combustion of 702g of octane, C8H18, one of the principal components of gasoline?
2C8H18 + 25O2 ----> 16CO2 + 18H20
2C8H18 + 25O2 ----> 16CO2 + 18H20
- Sun Oct 15, 2017 8:50 pm
- Forum: Properties of Light
- Topic: Planck's Constant
- Replies: 10
- Views: 1236
Planck's Constant
When would I need to use Planck's constant?
- Sun Oct 15, 2017 8:47 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric effect [ENDORSED]
- Replies: 4
- Views: 605
Photoelectric effect [ENDORSED]
Hi can someone please give me a simple summary on the significance of the photoelectric effect?
- Sun Oct 08, 2017 8:08 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 9
- Views: 2968
Limiting Reactant
Hi can someone please explain what ratios have to do with finding the limiting reactant. Thanks!
- Sun Oct 08, 2017 7:58 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Sig Figs [ENDORSED]
- Replies: 4
- Views: 748
Re: Sig Figs [ENDORSED]
Ok so the rules of sig figs are: 1. Non-zero digits are always significant. (so 3.23 would have 3 sig figs) 2. Any zeros between two significant digits are significant. (202 would have 3 sig figs) 3. A final zero or trailing zeros in the decimal portion only are significant (0.00500 would have only ...