Search found 33 matches

by Husnia Safi - 1K
Thu Jun 07, 2018 10:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.21 partc
Replies: 1
Views: 78

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!
by Husnia Safi - 1K
Thu Jun 07, 2018 9:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.21 a
Replies: 1
Views: 80

4.21 a

Why is the answer trigonal planar with 120 degree angles when there are 5 regions of electron density?
by Husnia Safi - 1K
Thu Jun 07, 2018 9:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.19 d
Replies: 1
Views: 86

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!
by Husnia Safi - 1K
Sun Jun 03, 2018 10:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular vs. VSEPR shape
Replies: 3
Views: 76

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?
by Husnia Safi - 1K
Sun Jun 03, 2018 10:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 2
Views: 121

Chelate

What is a chelate? what does it have to do with ligands?
by Husnia Safi - 1K
Sun Jun 03, 2018 10:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand terms
Replies: 2
Views: 107

Ligand terms

Can someone please explain to me the significance of what monodentates, bidentates, tridentates, and hexodentates are?
by Husnia Safi - 1K
Sun May 27, 2018 10:21 pm
Forum: Ionic & Covalent Bonds
Topic: Most covalent or ionic character
Replies: 3
Views: 365

Most covalent or ionic character

What does it mean when something has the most covalent character? most ionic character?
by Husnia Safi - 1K
Sun May 27, 2018 10:16 pm
Forum: Air Pollution & Acid Rain
Topic: Acid deposition
Replies: 2
Views: 358

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 ...
by Husnia Safi - 1K
Mon May 21, 2018 9:01 pm
Forum: Lewis Structures
Topic: 3.41 part c
Replies: 4
Views: 144

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?
by Husnia Safi - 1K
Sun May 20, 2018 10:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Stable lewis structures
Replies: 2
Views: 129

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.
by Husnia Safi - 1K
Sun May 20, 2018 10:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Stable Lewis structures
Replies: 4
Views: 140

Stable Lewis structures

How do I know when I have found the most stable Lewis structure?
by Husnia Safi - 1K
Sun May 20, 2018 10:54 pm
Forum: Ionic & Covalent Bonds
Topic: Significance to the different interactions [ENDORSED]
Replies: 1
Views: 93

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!
by Husnia Safi - 1K
Wed May 09, 2018 11:28 am
Forum: Molarity, Solutions, Dilutions
Topic: question 8 week 5
Replies: 1
Views: 185

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...
by Husnia Safi - 1K
Wed May 09, 2018 11:22 am
Forum: Molarity, Solutions, Dilutions
Topic: Question 7 week 5
Replies: 1
Views: 178

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?
by Husnia Safi - 1K
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: 142

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)?
by Husnia Safi - 1K
Fri May 04, 2018 11:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for P^3- [ENDORSED]
Replies: 2
Views: 115

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+?
by Husnia Safi - 1K
Mon Apr 30, 2018 9:18 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.55 part c
Replies: 1
Views: 67

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?
by Husnia Safi - 1K
Mon Apr 30, 2018 9:14 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1.55 part b
Replies: 2
Views: 98

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?
by Husnia Safi - 1K
Tue Apr 24, 2018 4:16 pm
Forum: Photoelectric Effect
Topic: homework 1.25 part b
Replies: 3
Views: 109

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...
by Husnia Safi - 1K
Tue Apr 24, 2018 3:53 pm
Forum: Einstein Equation
Topic: converting from keV to joules
Replies: 7
Views: 290

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?
by Husnia Safi - 1K
Sun Apr 22, 2018 7:40 pm
Forum: Properties of Light
Topic: week 3 discussion, question 11
Replies: 2
Views: 91

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.
by Husnia Safi - 1K
Sun Apr 22, 2018 7:31 pm
Forum: Photoelectric Effect
Topic: Week 3 discussion, question 10
Replies: 2
Views: 95

Week 3 discussion, question 10

How did the discovery of photoelectric effect the world's understanding of the physics of quantum scale objects?
by Husnia Safi - 1K
Sun Apr 22, 2018 7:27 pm
Forum: DeBroglie Equation
Topic: Week 3 discussion, question 6 [ENDORSED]
Replies: 2
Views: 119

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?
by Husnia Safi - 1K
Thu Apr 12, 2018 11:44 pm
Forum: Properties of Light
Topic: Speed in vacuum
Replies: 3
Views: 111

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?
by Husnia Safi - 1K
Thu Apr 12, 2018 11:42 pm
Forum: Properties of Light
Topic: Frequency and wavelength [ENDORSED]
Replies: 4
Views: 148

Frequency and wavelength [ENDORSED]

Does frequency and wavelength have an inverse relationship? and if so, why?
by Husnia Safi - 1K
Thu Apr 12, 2018 11:33 pm
Forum: Limiting Reactant Calculations
Topic: actual vs. theoretical yield [ENDORSED]
Replies: 6
Views: 377

actual vs. theoretical yield [ENDORSED]

What is the difference?
by Husnia Safi - 1K
Thu Apr 12, 2018 9:40 pm
Forum: Significant Figures
Topic: Sig fifs in 750 [ENDORSED]
Replies: 6
Views: 379

Sig fifs in 750 [ENDORSED]

Does the number 750 have two sig figs? And would the number 750.01 have 5?
by Husnia Safi - 1K
Thu Apr 12, 2018 9:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review worksheet week 1: question 9 [ENDORSED]
Replies: 4
Views: 236

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
by Husnia Safi - 1K
Thu Apr 12, 2018 9:30 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review worksheet from week 1, question 8 [ENDORSED]
Replies: 1
Views: 175

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
by Husnia Safi - 1K
Sun Oct 15, 2017 8:50 pm
Forum: Properties of Light
Topic: Planck's Constant
Replies: 10
Views: 484

Planck's Constant

When would I need to use Planck's constant?
by Husnia Safi - 1K
Sun Oct 15, 2017 8:47 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect [ENDORSED]
Replies: 4
Views: 207

Photoelectric effect [ENDORSED]

Hi can someone please give me a simple summary on the significance of the photoelectric effect?
by Husnia Safi - 1K
Sun Oct 08, 2017 8:08 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 9
Views: 448

Limiting Reactant

Hi can someone please explain what ratios have to do with finding the limiting reactant. Thanks!
by Husnia Safi - 1K
Sun Oct 08, 2017 7:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Sig Figs [ENDORSED]
Replies: 4
Views: 390

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 ...

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