## Search found 30 matches

Sun Jun 03, 2018 10:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER MODEL FOR IODINE TRICHLORIDE
Replies: 2
Views: 283

### VSPER MODEL FOR IODINE TRICHLORIDE

Hi all,

This is a problem I had from a Peer Learning session. For the VSEPR formula I got Ax2E6 and I double checked to make sure all the bond and valence electrons added up.. which molecular geometric shape would this fall under? Help please and thanks
Mon May 28, 2018 12:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER MODEL
Replies: 3
Views: 208

### VSPER MODEL

When determining what kind of shape an element has how do we know which resonance structure is used?
Sun May 20, 2018 11:50 pm
Forum: Lewis Structures
Topic: Where to put double bonds? [ENDORSED]
Replies: 3
Views: 202

### Re: Where to put double bonds?[ENDORSED]

Double bonds usually go where they are needed to create the lowest formal charge possible.
Sun May 20, 2018 11:48 pm
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 7
Views: 551

### Re: Octet Exception

Exceptions to the octet rule fall into one of three categories: (1) an incomplete octet, (2) odd-electron molecules, and (3) an expanded octet.
Sun May 20, 2018 11:45 pm
Forum: Resonance Structures
Topic: COVALENT VS IONIC LEWIS STRUCTURES [ENDORSED]
Replies: 1
Views: 192

### COVALENT VS IONIC LEWIS STRUCTURES[ENDORSED]

Can someone help explain to me the process of drawing out the lewis structure for a covalent bond? For example ammonium chloride (problem 3.39)
Sun May 13, 2018 10:56 pm
Forum: Octet Exceptions
Topic: OCTET RULE [ENDORSED]
Replies: 10
Views: 506

### Re: OCTET RULE[ENDORSED]

okay so the octet rule fully applies when we are trying to stabalize an atom?
Sun May 13, 2018 10:54 pm
Forum: Lewis Structures
Topic: EXAMPLE 3.3 Counting electron pairs
Replies: 2
Views: 109

### Re: EXAMPLE 3.3 Counting electron pairs

okay, i'm starting to understand this more! So on the lewis structure for h20 there are 2 lone pair electrons outside of the oxygen atom and 4 electron pairs in total because of the two lone pairs + the 2 electrons that bond the hydrogen and oxygen together, right?
Sun May 13, 2018 10:48 pm
Forum: Lewis Structures
Topic: EXAMPLE 3.3 Counting electron pairs
Replies: 2
Views: 109

### EXAMPLE 3.3 Counting electron pairs

In example 3.3, it is stated that H2o has 4 electron pairs and im having trouble understanding how. For the configurations of each element I got: (hydrogen) 1s1, (hydrogen) 1s1, and (oxygen) 2s2 2p4 and counted 2 electron pairs instead of 4. Can anyone help me out?
Sun May 13, 2018 10:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: FORMAL CHARGE
Replies: 9
Views: 486

### Re: FORMAL CHARGE

Okay, sorry i'm getting used to the terms for this chapter. So, the lone pair electrons would be the electrons not shared with another atom (on the lewis structure it would be the dots on the outside of the element letters right)?
Sun May 13, 2018 10:27 pm
Forum: Octet Exceptions
Topic: OCTET RULE [ENDORSED]
Replies: 10
Views: 506

### OCTET RULE[ENDORSED]

What exactly does the octet rule mean? When forming ions does there have to be 8 electrons available after removing/adding an electron?
Sun May 13, 2018 10:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: FORMAL CHARGE
Replies: 9
Views: 486

### FORMAL CHARGE

When trying to figure out the formal charge of a bond, how do we know the amount of loan pair electrons?
Sun May 13, 2018 10:09 pm
Forum: Ionic & Covalent Bonds
Topic: VALENCE ELECTRONS [ENDORSED]
Replies: 16
Views: 932

### VALENCE ELECTRONS[ENDORSED]

Hi all, I'm still having a hard time understanding how to know how many valence electrons a specific element has. Can anyone help me out?
Sun Apr 29, 2018 11:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HELP hw problem 2.17 [ENDORSED]
Replies: 5
Views: 170

### Re: HELP hw problem 2.17[ENDORSED]

okay yay I actually understand now! Thank you guys!!!!
Sun Apr 29, 2018 11:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HOMEWORK PROBLEM 2.19 [ENDORSED]
Replies: 1
Views: 124

### HOMEWORK PROBLEM 2.19[ENDORSED]

2.19 (a) How many values of the quantum number l are possible when n  7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with n  4? Im not fully understandi...
Sun Apr 29, 2018 11:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HOMEWORK PROBLEM 2.19
Replies: 3
Views: 255

### HOMEWORK PROBLEM 2.19

2.19 (a) How many values of the quantum number l are possible when n  7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with n  4? Im not fully understandi...
Sun Apr 29, 2018 10:42 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HELP hw problem 2.17 [ENDORSED]
Replies: 5
Views: 170

### HELP hw problem 2.17[ENDORSED]

2.17 How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3? I saw a previous response for this question and i'm not fully understanding the concept. i know that when l=0, m must equal 0.... but how do we know that when l=2 it'll have 5 orbitals?? can someone please help me un...
Sun Apr 29, 2018 10:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: PROBLEM 2.21
Replies: 2
Views: 151

### Re: PROBLEM 2.21

okay. Thank you so much!!
Sun Apr 29, 2018 10:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: PROBLEM 2.21
Replies: 2
Views: 151

### PROBLEM 2.21

2.21 What are the principal and orbital angular momentum
quantum numbers for each of the following orbitals: (a) 6p;
(b) 3d; (c) 2p; (d) 5f?

I'm having a hard time understanding where to start with this problem. can anyone help me please?
Sun Apr 29, 2018 10:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: PROBLEM 2.1
Replies: 4
Views: 230

### PROBLEM 2.1

2.1 Which of the following increase when the electron in a hydrogen atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom. Can anyone please explain the difference between a 1s orbital and 2p orbital? Im st...
Mon Apr 23, 2018 4:00 pm
Forum: Einstein Equation
Topic: HOMEWORK PROBLME 1.9 [ENDORSED]
Replies: 5
Views: 358

### Re: HOMEWORK PROBLME 1.9[ENDORSED]

Oh okay I understand now! Thank you!
Mon Apr 23, 2018 1:16 pm
Forum: Einstein Equation
Topic: HOMEWORK PROBLME 1.9 [ENDORSED]
Replies: 5
Views: 358

### Re: HOMEWORK PROBLME 1.9[ENDORSED]

For example, on problem 1.33c I got an answer of wavelength 1.2 x 10^-8 meters.. how can I better identify which region on the EM spectrum this falls under (especially when the answer I get is in scientific notation?
Sun Apr 22, 2018 7:19 pm
Forum: Einstein Equation
Topic: HOMEWORK PROBLME 1.9 [ENDORSED]
Replies: 5
Views: 358

### HOMEWORK PROBLME 1.9[ENDORSED]

So in this problem there is a chart with various given info (energy, wavelength, frequency) and you find the missing pieces with what has been given. I was able to complete the chart but I'm having a hard time understanding which region on the electromagnetic spectrum certain photons are on given a ...
Sun Apr 22, 2018 7:13 pm
Forum: Properties of Electrons
Topic: problem 1.21)
Replies: 1
Views: 137

### problem 1.21)

Can someone please explain how the photoelectric effect best supports the idea that electromagnetic radiation has the properties of particles?
Wed Apr 18, 2018 3:47 pm
Forum: Properties of Light
Topic: 1.23
Replies: 3
Views: 170

### Re: 1.23

Okay. First things first. Identify what has been GIVEN in the equation and what it is that we are looking for.... GIVEN: energy of the photon 140.511keV ... WHAT WE'RE LOOKING FOR: the wavelength of the y-rays= ? Next, in order to even use the given information (GIVEN: energy of the photon 140.511ke...
Wed Apr 11, 2018 9:28 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework problem G13
Replies: 1
Views: 158

### Homework problem G13

To prepare a fertilizer solution, a fl orist dilutes 1.0 L of 0.20 m NH4NO3(aq) by adding 3.0 L of water. The fl orist then adds 100. mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive? Solve this exercise without using a calculator. I have no idea how...
Wed Apr 11, 2018 9:22 am
Forum: Molarity, Solutions, Dilutions
Topic: STEPS to figuring out solutions/ molarity quesitons
Replies: 2
Views: 182

### STEPS to figuring out solutions/ molarity quesitons

Can anyone help to give me just like a basic outline of the kinds of questions pertaining to solutions and molarity. I have such a hard time evaluating the questions. For example with mole problems I know their either going to be asking me to find the moles, find the grams, or find the mass comp., o...
Wed Apr 11, 2018 9:15 am
Forum: Molarity, Solutions, Dilutions
Topic: Review Question [ENDORSED]
Replies: 3
Views: 343

### Re: Review Question[ENDORSED]

So in order to solve this problem, you have to first think about what it is that the question is asking you to find. The question is asking you to compare the molarity that indicates hard water (5.30 x 10 -3) with the given information. This means that you need to figure out the molarity with the gi...
Wed Apr 11, 2018 9:03 am
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals problem G7
Replies: 2
Views: 158

### Fundamentals problem G7

You need to prepare 510. g of an aqueous solution containing 5.45% KNO3 by mass. Describe how you would prepare the solution and what mass of each component you would use. In this question when they ask how would you prepare are they referring to the amount of L or ml used when using this mass of so...
Wed Apr 11, 2018 8:58 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Help with homework problem section E
Replies: 1
Views: 247

### Help with homework problem section E

A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl24H2O. (b) How many moles of Cl ions are present in the sample? (c) How many H2O molecules are present in the sample? (d) What fraction of the total mass of the sample was due to oxygen? I understand that to find the moles of Cl ...
Mon Apr 09, 2018 6:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 9
Views: 632

### Re: Molar Mass

Atomic mass is measured via mass spectrometry. Molar mass is computed from the atomic weight. There are no units of measurement for atomic masses because these are relative masses meaning these are “unitless.” So the atomic mass is measured by calculating the mass of protons and neutrons. Whereas th...