## Search found 11 matches

Sat Nov 03, 2018 10:17 pm
Forum: Properties of Light
Topic: Practice Midterm 8b
Replies: 3
Views: 152

### Practice Midterm 8b

A newly designed laser pointed with a certain frequency is pointed at a sodium metal surface. An electron is ejected from the metal surface with wavelength 1.10nm. What is the frequency of the light from the laser pointer? The work function of sodium is 150.6kJmol-1. I'm not too sure which equations...
Sat Nov 03, 2018 8:09 pm
Forum: Empirical & Molecular Formulas
Topic: Midterm Practice Problem #1
Replies: 2
Views: 121

### Midterm Practice Problem #1

Isopropyl alcohol, used in rubbing alcohol, is a compound containing only C, H, and O. What is the empirical formula of isopropyl alcohol if you find that 0.255 g of the compound gives 0.561g of CO2 and 0.306 g of H2O when burned completely in excess oxygen?
Sat Nov 03, 2018 8:06 pm
Forum: DeBroglie Equation
Topic: Practice Midterm 6a
Replies: 1
Views: 162

### Practice Midterm 6a

6a) A new element GarBreadium is discovered to have molar mass 3.157g.mol-1. The GarBreadium atom travels at an average speed of 1.35x10^3m.s-1 at room temperature. What is the average wavelength of the GarBreadium atom at room temperature? Would I use the DeBroglie formula for this question? If so,...
Tue Oct 23, 2018 9:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.19 (b)
Replies: 3
Views: 69

### Re: 2.19 (b)

which version of textbook do you have? I have the 6th edition and 2.19b asks for "How many values of m are allowed for an electron in a 6d-subshell?" to which the answer would be m= -2, -1, 0, 1, 2 since l=3 as the electron is in a d-orbital. ahhh oki i see where i went wrong! yes, i have...
Tue Oct 23, 2018 8:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.19 (b)
Replies: 3
Views: 69

### 2.19 (b)

(b) How many values of m are allowed for an electron in a 5f-subshell? I got: n = 5 (from the "5" in 5f) l = 0, 1, 2, 3, 4 (0, 1, ... n-1) m = 4, 3, 2, 1, 0, -1, -2, -3, -4 However, the solutions manual says that m has 5 values: -2, -1, 0, 1, 2. Would someone please explain to me where I w...
Sat Oct 20, 2018 11:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.31
Replies: 2
Views: 74

### 2.31

2.31 Which of the following subshells cannot exist in an atom: (a) 2d; (b) 4d; (c) 4g; (d) 6f?
Sat Oct 20, 2018 9:16 pm
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 338

### Re: Do I have to memorize the spectrum?

I don't think so!
Sat Oct 20, 2018 9:15 pm
Forum: Properties of Light
Replies: 7
Views: 141

Grades should be on myucla by the end of the quarter, I think!
Sat Oct 13, 2018 9:40 pm
Forum: Empirical & Molecular Formulas
Topic: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
Replies: 8
Views: 287

### Re: Is it possible for the Empirical and Molecular formula to be the same?[ENDORSED]

Yes it's possible!
Sat Oct 13, 2018 9:37 pm
Forum: Properties of Electrons
Topic: Quantum World 1.33
Replies: 4
Views: 97

### Quantum World 1.33

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 " 103 kms1.
(a) What is the wavelength of the ejected electron?
Sat Oct 13, 2018 9:35 pm
Forum: Properties of Electrons
Topic: Quantum World 1.43
Replies: 2
Views: 61

### Quantum World 1.43

Hoping someone could help me with this problem! Thanks.

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.