## Search found 20 matches

Wed Aug 02, 2017 9:00 am
Forum: Calculating the pH of Salt Solutions
Topic: Writing out Chemical Equation
Replies: 2
Views: 469

### Re: Writing out Chemical Equation

Thank you.
Tue Aug 01, 2017 10:22 pm
Forum: Calculating the pH of Salt Solutions
Topic: Writing out Chemical Equation
Replies: 2
Views: 469

### Writing out Chemical Equation

Will we need to write out the chemical equation when calculating the pH of salt solutions or will the chemical equation be given to us?
Tue Aug 01, 2017 5:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.49
Replies: 1
Views: 299

### Re: 11.49

To find the equilibrium concentrations of NH3 and H2S, first write out the equilibrium constant expression: Kc= [NH3]*[H2S] / 1 -I placed a one in the denominator because the concentration of a solid, which in this case is NH4HS, is 1 then make a table to find the missing values: initial concentrati...
Mon Jul 31, 2017 2:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial pressure definition
Replies: 3
Views: 378

### Re: Partial pressure definition

I found the definition of partial pressure in the textbook, it is "the pressure that a gas in a mixture would exert if it alone occupied the container." I think "partial" is mentioned because we are considering a combination of gases in a reaction and each gas is a part of the wh...
Wed Jul 12, 2017 9:03 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 2.47
Replies: 3
Views: 585

### Re: Problem 2.47

Write the electron configuration of each and typically the last orbital will not be completely filled, so that will be the orbital the electron will be removed from.
Tue Jul 11, 2017 10:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 4
Views: 493

### Electron Configurations

I using this list to write electron configurations

1s,2s,2p,3s,3p3d,4s,4p,4d,5s,5p,4f,5d,6s,6p,5f,6d,7s,7p

Does anyone else use this list? What are your methods for writing electron configurations?
Tue Jul 11, 2017 6:54 pm
Forum: DeBroglie Equation
Topic: question on how to determine if something has wavelike properties.
Replies: 6
Views: 1226

### Re: question on how to determine if something has wavelike properties.

Converting the wavelength to nanometers, the wavelength becomes 5.03*10^-26, this is a very small wavelength, therefore we cannot see the wavelike characteristics of the ball. The De Broglie equation relates all matter has wavelike properties. Wavelike properties were discovered by diffraction (the ...
Tue Jul 11, 2017 4:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Chapter 2, Question 31
Replies: 1
Views: 333

### Chapter 2, Question 31

Why can a 6f orbital exist?
Mon Jul 10, 2017 7:24 pm
Forum: Empirical & Molecular Formulas
Topic: Limiting Reactants?
Replies: 5
Views: 987

### Re: Limiting Reactants?

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...
Mon Jul 10, 2017 6:12 pm
Forum: Empirical & Molecular Formulas
Topic: Limiting Reactants?
Replies: 5
Views: 987

### Re: Limiting Reactants?

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.
Mon Jul 10, 2017 12:18 am
Forum: DeBroglie Equation
Topic: Exercise 1.39 [ENDORSED]
Replies: 4
Views: 947

### Re: Exercise 1.39[ENDORSED]

1) convert 5.15 oz to grams, and 92mph to meters per second

2) once converted, use the De Broglie equation: wavelength=(h)/(mass*velocity)

3) then you will get your answer in meters, convert to nanometers just in case
Sat Jul 08, 2017 12:54 pm
Forum: Photoelectric Effect
Topic: Chapter 1, problem 33
Replies: 2
Views: 423

### Re: Chapter 1, problem 33

I figured out how you guys got 1.66* 10^-17, (0.5*9.109*10^-31)(3.6*10^3)^2=(6.626*10^-34)(2.50*10^16)-workfunction.

I used (3.6*10^3*10^3) to convert the speed from km/s to m/s, and the equation above just keeps the km/s unit.
Sat Jul 08, 2017 1:07 am
Forum: Photoelectric Effect
Topic: Chapter 1, problem 33
Replies: 2
Views: 423

### Chapter 1, problem 33

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6*10^3 km/s. a) What is the wavelength of the ejected electron? b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50* 10^16 Hz. How much energy is required to r...
Fri Jul 07, 2017 11:00 pm
Forum: Properties of Light
Topic: Chapter 1, problem 3 [ENDORSED]
Replies: 10
Views: 941

### Re: Chapter 1, problem 3[ENDORSED]

I think this question is referring to light and not particles, so I think we are on track.
Fri Jul 07, 2017 9:37 pm
Forum: Properties of Light
Topic: Homework 1.21
Replies: 1
Views: 278

### Re: Homework 1.21

The black-body radiation lead Planck to propose his hypothesis that matter and radiation exchange energy in quanta (packets of energy), essentially Planck proposed the idea of particles properties in light. Planck conducted more experiments, which led to the photoelectric effect, to prove his hypoth...
Fri Jul 07, 2017 7:04 pm
Forum: Properties of Light
Topic: Chapter 1, problem 3 [ENDORSED]
Replies: 10
Views: 941

### Chapter 1, problem 3[ENDORSED]

If the frequency of electromagnetic radiation decreases, will the speed of electromagnetic radiation also decrease?
I was thinking the speed will not decrease because the speed of light is constant (c= wavelength*frequency), are there other reasons?
Fri Jul 07, 2017 6:07 pm
Forum: Student Social/Study Group
Topic: Thoughts after Test 1?
Replies: 13
Views: 1292

### Re: Thoughts after Test 1?

Yeah, I think it would be best to look at all the exam questions instead of answering them in order to see which question would be more time consuming.
Mon Jul 03, 2017 1:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Topics Covered on Test 1?
Replies: 1
Views: 251

### Topics Covered on Test 1?

Will test 1 just cover the fundamentals and quantum world?
Wed Jun 28, 2017 6:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question on Problem E.1 in textbook [ENDORSED]
Replies: 2
Views: 343

### Re: Question on Problem E.1 in textbook[ENDORSED]

Oh right, thank you!
Wed Jun 28, 2017 3:58 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question on Problem E.1 in textbook [ENDORSED]
Replies: 2
Views: 343

### Question on Problem E.1 in textbook[ENDORSED]

"Suppose you were able to string together 1.00 mol Ag atoms. each of radius 144pm, into one of these fibers by encapsulating them in carbon nanotubes. How long would the fiber extend?" In the solution manual the radius, 144pm, is multiplied by two to find the diameter of the atom which is ...