Search found 37 matches

by Jessica Urzua-1H
Thu Jun 07, 2018 8:35 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 5
Views: 113

Re: Polydentate

A polydentate is able to bind to a metal at several different locations (elements/lone pairs) while a monodentate can only bind to a metal one element/lone pair at time. Cyanide is not a polydentate, because the metal can only bind to one of the lone pairs in the structure at a time, therefore makin...
by Jessica Urzua-1H
Wed Jun 06, 2018 9:37 pm
Forum: General Science Questions
Topic: Notes Needed!!
Replies: 3
Views: 179

Re: Notes Needed!!

Thank you so much!!
by Jessica Urzua-1H
Wed Jun 06, 2018 6:17 pm
Forum: General Science Questions
Topic: Notes Needed!!
Replies: 3
Views: 179

Notes Needed!!

I was not able to make it to class last Friday (6/1/18) and this past Monday (6/4/18) due to a family emergency, and I was not able to get the notes from anyone. If anyone could possibly attach the notes to this post, it would appreciated! Thanks!!
by Jessica Urzua-1H
Wed Jun 06, 2018 6:12 pm
Forum: Lewis Acids & Bases
Topic: Ka
Replies: 5
Views: 196

Re: Ka

Ka is an acid dissociation constant that is a quantitative measure of the strength of an acid in solution.
by Jessica Urzua-1H
Wed Jun 06, 2018 6:10 pm
Forum: Conjugate Acids & Bases
Topic: pKa [ENDORSED]
Replies: 3
Views: 198

Re: pKa [ENDORSED]

You would have to do research in order to figure out the pKa of a molecule. It cannot simply be figured out just by looking at the molecule.
by Jessica Urzua-1H
Wed Jun 06, 2018 6:09 pm
Forum: Bond Lengths & Energies
Topic: unit box
Replies: 3
Views: 155

Re: unit box

I believe you are referring to a conversion box, which is used to convert from one unit into another. For example, if you are given a value in kg, then you can use a conversion box to convert kg to g.
by Jessica Urzua-1H
Sun Jun 03, 2018 10:54 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE formula
Replies: 18
Views: 536

Re: AXE formula

It is possible. The AXE formula tells you how many regions of electron density there are, which ones are specifically bonding pairs, and which ones are lone pairs. This is all that is needed to determine molecular shape.
by Jessica Urzua-1H
Sun Jun 03, 2018 10:46 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Atom Distance, repulsion?
Replies: 6
Views: 172

Re: Atom Distance, repulsion?

The overall structure of the molecule is most stable when electrons are as far from each other as possible, which occurs because their negative charges are repelling each other.
by Jessica Urzua-1H
Wed May 30, 2018 8:13 pm
Forum: Lewis Structures
Topic: Corbon Monoxide
Replies: 5
Views: 181

Re: Corbon Monoxide

It is best to fulfill the octet rule for elements that need it and then minimize the formal charge of each element in the molecule as much as possible.
by Jessica Urzua-1H
Wed May 30, 2018 3:27 pm
Forum: Lewis Structures
Topic: Lewis Structures with Transition Metals
Replies: 2
Views: 123

Lewis Structures with Transition Metals

On Test 3, there was a question involving drawing the most stable Lewis structure for a molecule that contained a transition metal. I was really confused as to how to figure out how many valence electrons are in each different transition metal. Any help is appreciated!!
by Jessica Urzua-1H
Wed May 30, 2018 3:20 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.25 [ENDORSED]
Replies: 3
Views: 135

Re: Help on 3.25 [ENDORSED]

To figure out the chemical formula, I usually pay attention to the suffixes and the Roman numerals of the compounds being named.
b) indium(III) sulfide = In2S3
d) hydrogen telluride = H2Te
e) bismuth(III) floride = BiF3
by Jessica Urzua-1H
Wed May 23, 2018 6:57 pm
Forum: Resonance Structures
Topic: HW 4.7
Replies: 3
Views: 147

Re: HW 4.7

Yes, the angles would be 109.5 degrees for this specific molecule, however, molecules with trigonal pyramidal shapes have angles that differ based on the atoms involved in the molecule. For example, the ion SO3^2- is trigonal pyramidal, but the angles are actually 106 degrees and not the expected 10...
by Jessica Urzua-1H
Tue May 22, 2018 6:49 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge vs Oxidation Numbers
Replies: 2
Views: 150

Re: Formal Charge vs Oxidation Numbers

I found this video online that makes a comparison between the two, which I found very helpful. I hope this helps!!

https://www.khanacademy.org/science/org ... ion-states
by Jessica Urzua-1H
Tue May 22, 2018 6:46 pm
Forum: Resonance Structures
Topic: HW 4.7
Replies: 3
Views: 147

Re: HW 4.7

I believe different bond angles refer to how many different degree types are found in the molecule, such as 90 degrees, 120 degrees, 180 degrees, etc. The follow up question just refers to the values of the of such degrees in the molecule. I hope this helps!!
by Jessica Urzua-1H
Tue May 22, 2018 6:42 pm
Forum: Electronegativity
Topic: Electronegativity Caluclations
Replies: 4
Views: 186

Re: Electronegativity Caluclations

I am pretty sure the electronegativity would be given, because research would have to be done to obtain such values.
by Jessica Urzua-1H
Mon May 14, 2018 6:49 pm
Forum: Significant Figures
Topic: what part of the probem to apply sig fig rules
Replies: 2
Views: 130

Re: what part of the probem to apply sig fig rules

Only apply significant figures to the last step of a problem to get the most accurate answer.
by Jessica Urzua-1H
Mon May 14, 2018 6:47 pm
Forum: Resonance Structures
Topic: Number of Resonance Strucutres
Replies: 3
Views: 120

Re: Number of Resonance Strucutres

I found this website that describes how to identify resonance structures from Lewis structures and what they should consist of. I found it very helpful.

http://shimizu-uofsc.net/orgo/Chem_333/1c.i.html
by Jessica Urzua-1H
Mon May 14, 2018 6:38 pm
Forum: Lewis Structures
Topic: Corbon Monoxide
Replies: 5
Views: 181

Re: Corbon Monoxide

Usually, the most stable Lewis structure for any molecule involves atoms with a formal charge of 0 if possible. When a formal charge of 0 is not possible for each atom in the molecule, values close to 0, such as +1 and -1, would result in the most stable structure.
by Jessica Urzua-1H
Tue May 08, 2018 7:51 pm
Forum: Properties of Electrons
Topic: Protons vs. Electrons
Replies: 4
Views: 221

Re: Protons vs. Electrons

Lyndonium is said to have a De Broglie longer wavelength, because when you manipulate the De Broglie wavelength equation, you can conclude that the wavelength = h/mv. This equation tells you that the wavelength size is dependent on the mass of the element, because the problem is telling you that Hel...
by Jessica Urzua-1H
Tue May 08, 2018 3:54 pm
Forum: Properties of Electrons
Topic: Protons vs. Electrons
Replies: 4
Views: 221

Re: Protons vs. Electrons

An electron travels faster than a proton because of its mass. If you rearrange the De Broglie equation, the total velocity is dependent on the mass of the particle, and electrons happens to be lighter than protons. I hope this helps!!
by Jessica Urzua-1H
Tue May 08, 2018 3:47 pm
Forum: Lewis Structures
Topic: Octet
Replies: 3
Views: 121

Re: Octet

These are exceptions to the octet rule, because these elements have too few valence electrons to form an octet. The orbitals that these elements can fulfill (which are only in the s-state) do not allow for an octet. For example, the p-state has 3 orbitals, which has a maximum of 6 electrons, and the...
by Jessica Urzua-1H
Wed May 02, 2018 8:59 pm
Forum: Trends in The Periodic Table
Topic: Periodic Table Trends on the Midterm
Replies: 4
Views: 145

Periodic Table Trends on the Midterm

For the midterm, are we going to be expected to be able to apply the periodic table trends we learned in lecture in some way on the exam and/or future exams, or do we just need to know the trends? Any help is appreciated!!
by Jessica Urzua-1H
Wed May 02, 2018 8:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d block electron configuration
Replies: 5
Views: 186

Re: d block electron configuration

I did some research because your question made me curious as well. The d-block is believed to start with 3d even though it is in the 4th period, because it deals with different amounts of energy. For example, scandium's (Sc) electron configuration is written as [Ar] 3d^1 4s^2 because the 3d state is...
by Jessica Urzua-1H
Wed May 02, 2018 8:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Scandium
Replies: 1
Views: 91

Re: Electron Configuration of Scandium

On the periodic table, the s-block comes before the d-block, so the d-orbitals appear to have higher energy than s-orbitals. However, when it comes to multi-electron atoms after the atomic number 20, the 4s state is higher than the 3d state. It is just an exception that is known for electron configu...
by Jessica Urzua-1H
Wed May 02, 2018 1:26 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper Electron Configurations
Replies: 2
Views: 419

Chromium and Copper Electron Configurations

For the ground state electron configurations for chromium and copper, we are supposed to put them in the form of d^5 and d^10. If we were finding electron configurations of ions, would we still try to complete a half full or full shell? How would the electron configuration look? More specifically, w...
by Jessica Urzua-1H
Sat Apr 28, 2018 6:26 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 7
Views: 260

Shrodinger Equation

I understand each of the parts that make up the Shrodinger equation, but I cannot seem to find out how to apply it. What types of problems would you apply this equation to? More specifically, what key words should we look for in problems that involve the use of this equation? What exactly would we u...
by Jessica Urzua-1H
Sat Apr 28, 2018 6:13 pm
Forum: Quantum Numbers and The H-Atom
Topic: Four Different Quantum Numbers
Replies: 7
Views: 183

Four Different Quantum Numbers

It is known that two electrons cannot have the same four quantum numbers, and I just wanted to know more specifically why that is. Any clarification would be great!
by Jessica Urzua-1H
Sat Apr 28, 2018 6:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau Principle Diagrams [ENDORSED]
Replies: 2
Views: 97

Aufbau Principle Diagrams [ENDORSED]

Can someone explain the reasoning behind the different spacing between each orbital in Aufbau Principle diagrams? More specifically, why are the s-orbitals closer than the p-orbitals, and so on? Also, why is 1s farther than 2s in the diagrams? Any help is appreciated!!
by Jessica Urzua-1H
Thu Apr 19, 2018 6:42 pm
Forum: Empirical & Molecular Formulas
Topic: Test #1 Question
Replies: 7
Views: 309

Test #1 Question

On Test #1, we were asked to find the empirical and molecular formula from chemical structures. Can someone please explain their process on figuring this out based solely on the structure? Any help is appreciated!!
by Jessica Urzua-1H
Thu Apr 19, 2018 6:34 pm
Forum: Properties of Electrons
Topic: Example from Lecture #8 [ENDORSED]
Replies: 2
Views: 161

Example from Lecture #8 [ENDORSED]

I had a question about the last image we saw in lecture, more specifically the quantum mechanical model of the atom. The only thing I understand about the model is that the circular wave around the nucleus represents electrons. Can anyone explain each part of the image and why it is different for al...
by Jessica Urzua-1H
Thu Apr 19, 2018 6:17 pm
Forum: Properties of Light
Topic: Homework Problem 1.5
Replies: 2
Views: 90

Homework Problem 1.5

Problem 1.5 asks us to arrange the types of photons of electromagnetic radiation in order of increasing energy. I just wanted to confirm that the correct order was microwaves, visible light, ultraviolet radiation, x-rays, and then gamma rays. If this is the correct order, can anyone explain exactly ...
by Jessica Urzua-1H
Wed Apr 11, 2018 12:36 am
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations Online Module Assessment
Replies: 1
Views: 121

Re: Balancing Chemical Equations Online Module Assessment

The amount of moles of each compound are actually not the same because they represent the molar ratios, in other words, the coefficients. The purpose of balancing chemical equations is to make sure you have the same number of elements on both sides. In the example, there are 16 carbons on the left a...
by Jessica Urzua-1H
Wed Apr 11, 2018 12:16 am
Forum: Limiting Reactant Calculations
Topic: Mass of Products VS. Mass of Reactants- Class Assessment
Replies: 5
Views: 161

Re: Mass of Products VS. Mass of Reactants- Class Assessment

The Law of Conservation of Mass states that matter cannot be created or destroyed. You can conclude that the answer is no, because the mass must be the same for both the reactants and the products no matter what the reactants and products are, including oxygen. It can be tricky because it is sometim...
by Jessica Urzua-1H
Wed Apr 11, 2018 12:01 am
Forum: SI Units, Unit Conversions
Topic: Units for Answer
Replies: 10
Views: 374

Re: Units for Answer

The best way to decide what units should be in the answer should be based on what the problem asks for specifically. For example, if the problem asks for the answer in kg specifically, then you should convert g back to kg. If you happen to come across problem that requires you to convert kg to g to ...
by Jessica Urzua-1H
Sat Apr 07, 2018 11:11 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Problem F9
Replies: 2
Views: 117

Homework Problem F9

The homework problem F9 asks: In what atom ratios are the atoms present in vanillin? I am pretty sure that the problem is asking for the empirical formula, but I just wanted to make sure. Any clarification would be helpful.
by Jessica Urzua-1H
Fri Apr 06, 2018 1:20 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Dimensional Analysis Help [ENDORSED]
Replies: 6
Views: 241

Re: Dimensional Analysis Help [ENDORSED]

I would say dimensional analysis is needed in all chemistry problems, unless certain measurements are the same and the question does not specifically ask for one type of measurement. For example, if you have a problem that involves mL/mol instead of L/mol, it is okay to keep your answer in mL/mol as...
by Jessica Urzua-1H
Fri Apr 06, 2018 1:08 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Which mass of oxygen should be used? [ENDORSED]
Replies: 23
Views: 806

Which mass of oxygen should be used? [ENDORSED]

When finding empirical formula/molecular formula or in general for chemistry, does it matter whether we use 15.99 grams/mole or 16.00 grams/mole for the mass of oxygen? I tried doing the same calculations with both numbers and I get a slightly different answer each time. The result is not off by muc...

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