Search found 21 matches

by sandraabdelmalak1D
Tue Aug 01, 2017 1:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: question help
Replies: 1
Views: 213

Re: question help

Never mind! Got it.
by sandraabdelmalak1D
Tue Aug 01, 2017 12:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: question help
Replies: 1
Views: 213

question help

I'm not sure if I am just calculating this wrong but can someone walk me through this problem? You are studying the following unbalanced reaction at high temperatures: NH3 (g) ⇌ N2 (g) + H2 (g) In one of your experiments at 500K the measured partial pressures are: NH3 0.887 bar H2 0.168 bar N2 0.056...
by sandraabdelmalak1D
Mon Jul 24, 2017 5:41 pm
Forum: Coordinate Covalent Bonds
Topic: chapter 3 problem 27C help
Replies: 2
Views: 397

chapter 3 problem 27C help

The problem asks:
On the basis of the expected charges of the monatomic ions, give the chemical formula of each of the following:
c) manganese(IV) oxide.
I don't really understand how to handle this/what the (IV) means.
by sandraabdelmalak1D
Mon Jul 24, 2017 10:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular VS Bent
Replies: 3
Views: 339

Re: Angular VS Bent

I believe that angular and bent mean the same thing.
by sandraabdelmalak1D
Sun Jul 23, 2017 10:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Self-Test 2 Problem 4
Replies: 2
Views: 305

Re: Self-Test 2 Problem 4

I am not sure about the oxidation portion of the question either, but i also got that the coordination number is 4.
by sandraabdelmalak1D
Sun Jul 23, 2017 10:17 pm
Forum: Octet Exceptions
Topic: lewis structures
Replies: 2
Views: 211

lewis structures

ok so just to clarify, is there a certain rule to abide by when seeing if an element can exceed the octet rule? I know that the rule of thumb is if it equals n=3 or above but if someone can explain in more detail that'd be awesome.
by sandraabdelmalak1D
Fri Jul 21, 2017 7:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: angular v. linear
Replies: 1
Views: 144

angular v. linear

can someone explain to me how i can tell if the shape of a molecule will be angular/bent or linear? I know it has something to do with lone pairs but I need a little bit more help.
by sandraabdelmalak1D
Tue Jul 11, 2017 10:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: question on hw 2.29
Replies: 2
Views: 193

question on hw 2.29

For part C, it asks how many electrons can have the following quantum numbers in an atom and it gives us n=4, l=2, ml= -2. The answer in the book is 2 electrons, can someone please walk me through it? Thank you.
by sandraabdelmalak1D
Tue Jul 11, 2017 8:19 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: problem help
Replies: 5
Views: 692

problem help

You are caught in a radar trap and hope to show that the speed measured by the radar gun is in error due to the Heisenberg uncertainty principle. If you assume that the uncertainty in your position was +/- 5 m when your speed was measured, and that the car has a mass of 2150 kg, what is your calcula...
by sandraabdelmalak1D
Tue Jul 11, 2017 7:25 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: question on post module
Replies: 1
Views: 196

question on post module

The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in the speed of the electron using the Heisenberg uncertainty principle. Comment on your value obtained. Can someone walk m...
by sandraabdelmalak1D
Tue Jul 11, 2017 6:21 pm
Forum: DeBroglie Equation
Topic: question on how to determine if something has wavelike properties.
Replies: 6
Views: 777

question on how to determine if something has wavelike properties.

Calculate the de Broglie wavelength of a 0.155 kg ball travelling at 85.0 m.s-1. Can we detect this wavelength or observe the wavelike characteristics of this ball?

I got that the answer is 5.03 x 10^-35 m. I just don't understand how to determine whether something has wavelike properties or not?
by sandraabdelmalak1D
Mon Jul 10, 2017 9:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: atomic spectroscopy question
Replies: 1
Views: 232

atomic spectroscopy question

In the above spectroscopic experiment what is the most unique characteristic of the observed results? Hint: What does a typical spectrum look like? A. All wavelengths of light are absorbed or emitted. Spectrum consists of lines. B. No wavelengths of light are absorbed or emitted. Spectrum consists o...
by sandraabdelmalak1D
Mon Jul 10, 2017 9:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: HW Ch2. 19 (d)
Replies: 2
Views: 224

Re: HW Ch2. 19 (d)

There are 3 subshells in the shell where n=3.
The number of types of subshells is the same as the shell number.
The first shell has one type of subshell (s)
The second shell has two types of subshells (s, p)
The third shell has three types of subshells (s, p, d).
by sandraabdelmalak1D
Wed Jul 05, 2017 9:09 pm
Forum: Limiting Reactant Calculations
Topic: help with question
Replies: 2
Views: 435

help with question

According to the following equation, 0.750 g of C6H9Cl3 is mixed with 1.000 kg of AgNO3 in a flask of water. A white solid, AgCl, completely precipitates out. What is the mass of AgCl produced? C6H9Cl3 + 3AgNO3 ---> AgCl + C6H9(NO3)3. Molar Mass: C6H9Cl3 (187.50 g/mol), 3AgNO3 (169.88 g/mol), AgCl (...
by sandraabdelmalak1D
Sun Jul 02, 2017 6:47 pm
Forum: Properties of Electrons
Topic: About the holiday in Tuesday
Replies: 2
Views: 242

Re: About the holiday in Tuesday

There are no discussion sections or office hours on Tuesday I believe, Professor Lavelle said so in class on Friday.
by sandraabdelmalak1D
Sun Jul 02, 2017 6:11 pm
Forum: Molarity, Solutions, Dilutions
Topic: problem g13 help
Replies: 3
Views: 367

problem g13 help

To prepare a fertilizer solution, a florist dilutes 1.0L of 0.20 M NH4NO3 (aq) by adding 3.0L of water. The nurse then adds 100.0 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. Can someone walk me th...
by sandraabdelmalak1D
Sun Jul 02, 2017 6:09 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron configurations
Replies: 3
Views: 267

Re: Electron configurations

Using the electron configuration of another element in brackets and then containing the configuration is just a shorthand way of writing the entire thing out. I don't think there's any particular reason other than that it is shorter, but I might be wrong.
by sandraabdelmalak1D
Sun Jul 02, 2017 4:51 pm
Forum: SI Units, Unit Conversions
Topic: Test 1 [ENDORSED]
Replies: 3
Views: 434

Re: Test 1 [ENDORSED]

Not sure that this entirely answers your question, but on the syllabus it says it will cover material reviewed up till July 5th.
by sandraabdelmalak1D
Fri Jun 30, 2017 7:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: question on molarity calculations
Replies: 1
Views: 164

question on molarity calculations

A student prepared a solution of sodium carbonate by adding 2.111g of the solid to a 250.0mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain a) 2.15 mmol Na+; b) 4.98mmol CO3^-...
by sandraabdelmalak1D
Wed Jun 28, 2017 7:35 pm
Forum: Limiting Reactant Calculations
Topic: limiting reactant question [ENDORSED]
Replies: 6
Views: 630

limiting reactant question [ENDORSED]

For the following equation, determine the limiting reagent if 21.4 g NH3 is reacted with 42.5 g of O2. 4NH3(g) + 5O2(g) ---> 4NO(g) + 6H2O(g) I understand how to do this problem until I get to the part where I compare the calculated moles with the required moles in the balanced equation. How do I us...
by sandraabdelmalak1D
Wed Jun 28, 2017 7:01 pm
Forum: Limiting Reactant Calculations
Topic: Question on limiting reactant calculations
Replies: 2
Views: 230

Question on limiting reactant calculations

Can the mass of a product (or products) be greater than the total mass of reactant (or reactants)?

I'm just not sure about this one and wanted a definitive answer. Thank you!

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