Search found 39 matches

by MichaelMendozaD1F
Mon Nov 16, 2020 8:52 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures When Given Name of Compound
Replies: 1
Views: 33

Drawing Lewis Structures When Given Name of Compound

Will we be expected to know or compose a lewis structures when given the name of the compound, such as "periodate ion" etc., on Midterm 2?
by MichaelMendozaD1F
Mon Nov 16, 2020 8:35 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v. Covalent Bonding
Replies: 16
Views: 84

Re: Ionic v. Covalent Bonding

Along with what everyone else has already said, a rough guideline for finding out if a bond is ionic or covalent is to find the difference in electronegativity between the two molecules. If the difference is greater than 2 then the bond is ionic, whereas if the difference is less than 1.5, the bond...
by MichaelMendozaD1F
Mon Nov 16, 2020 8:34 pm
Forum: Lewis Structures
Topic: Lewis acids and Bases
Replies: 20
Views: 73

Re: Lewis acids and Bases

How do you classify if a compound is a Lewis acid or base when given the chemical formula? Hi Michael! I had the same issue that you had in classifying the compounds, especially in Sapling. However, a quick note that might make it easier for you is that lewis acids are atoms that accept or take ele...
by MichaelMendozaD1F
Sun Nov 15, 2020 5:27 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v. Covalent Bonding
Replies: 16
Views: 84

Re: Ionic v. Covalent Bonding

how do we arrange bonds according to length? I believe this was in the sampling hw Q11. Bond length depends on the type of bond (single, double, triple) and the sizes of the atoms involved in the bond. Triple bonds are shorter than double bonds which are shorter than single bonds, given the bonds b...
by MichaelMendozaD1F
Sun Nov 15, 2020 5:04 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v. Covalent Bonding
Replies: 16
Views: 84

Re: Ionic v. Covalent Bonding

how do we arrange bonds according to length?
I believe this was in the sampling hw Q11.
by MichaelMendozaD1F
Sun Nov 15, 2020 5:03 pm
Forum: Resonance Structures
Topic: Sapling Week 6 Number 9
Replies: 5
Views: 41

Re: Sapling Week 6 Number 9

later in this problem it asks us for the oxidation number of chlorine, how do we find this? Hi, the sum of the oxidation numbers of the atoms in ion must equal the charge on the ion, -1. When oxygen is bonded to a nonmetal other than F, it has an oxidation number of -2. This is since there are four...
by MichaelMendozaD1F
Sun Nov 15, 2020 5:01 pm
Forum: Ionic & Covalent Bonds
Topic: Homework due date
Replies: 40
Views: 186

Re: Homework due date

which sections of hw will be on the midterm? I do not recall if it is cumulative or not... I'm pretty sure I remember my TA say in discussion that the midterms are not cumulative, so the next midterm should be based on the end of the week 2/3/4 homework on the quantum realm and the week 5/6 homewor...
by MichaelMendozaD1F
Sun Nov 15, 2020 4:46 pm
Forum: Resonance Structures
Topic: bond length
Replies: 37
Views: 74

Re: bond length

so how are we able to see which bonds are longer or smaller? like in Q11 of the sapling week 5 and 6 HW?
by MichaelMendozaD1F
Sun Nov 15, 2020 4:44 pm
Forum: Resonance Structures
Topic: Sapling Week 6 Number 9
Replies: 5
Views: 41

Re: Sapling Week 6 Number 9

later in this problem it asks us for the oxidation number of chlorine, how do we find this?
by MichaelMendozaD1F
Sun Nov 15, 2020 4:40 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v. Covalent Bonding
Replies: 16
Views: 84

Re: Ionic v. Covalent Bonding

Along with what everyone else has already said, a rough guideline for finding out if a bond is ionic or covalent is to find the difference in electronegativity between the two molecules. If the difference is greater than 2 then the bond is ionic, whereas if the difference is less than 1.5, the bond...
by MichaelMendozaD1F
Sun Nov 15, 2020 4:21 pm
Forum: Lewis Structures
Topic: Lewis acids and Bases
Replies: 20
Views: 73

Lewis acids and Bases

How do you classify if a compound is a Lewis acid or base when given the chemical formula?
by MichaelMendozaD1F
Sun Nov 15, 2020 4:19 pm
Forum: Lewis Structures
Topic: Nitrite vs Nitrate
Replies: 17
Views: 78

Re: Nitrite vs Nitrate

Will we be expected to differentiate between compounds like this on the midterm?
by MichaelMendozaD1F
Fri Nov 06, 2020 5:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm grades
Replies: 19
Views: 169

Re: Midterm grades

Anh Trinh 1B wrote:
MichaelMendozaD1F wrote:when will the answers be reviewed or released?


Dr. Lavelle will not release the answers, but in his email he said that he'll be going over the problems that students had the most difficulty during his upcoming final exam review sessions in Week 10!


thank you!
by MichaelMendozaD1F
Fri Nov 06, 2020 4:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 291
Views: 135736

Re: Saying Thank You to Dr. Lavelle

thank you for being so positive even when we are low on energy for faith in ourselves
by MichaelMendozaD1F
Fri Nov 06, 2020 4:32 pm
Forum: General Science Questions
Topic: Midterm 2
Replies: 4
Views: 69

Re: Midterm 2

so this midterm will be more conceptual ?
by MichaelMendozaD1F
Fri Nov 06, 2020 4:31 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 178
Views: 34293

Re: Final Jitters

essential oil on the neck and temples helps
by MichaelMendozaD1F
Fri Nov 06, 2020 4:27 pm
Forum: Ionic & Covalent Bonds
Topic: Homework due date
Replies: 40
Views: 186

Re: Homework due date

which sections of hw will be on the midterm? I do not recall if it is cumulative or not...
by MichaelMendozaD1F
Fri Nov 06, 2020 4:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm grades
Replies: 19
Views: 169

Re: Midterm grades

when will the answers be reviewed or released?
by MichaelMendozaD1F
Sun Nov 01, 2020 11:33 pm
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 341

Re: Test Scored for Midterm 1

I am under the impression they will be released next week?
by MichaelMendozaD1F
Sun Nov 01, 2020 11:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Scores
Replies: 28
Views: 237

Midterm Scores

When will our scores be released?
by MichaelMendozaD1F
Sun Nov 01, 2020 11:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 885

Re: Participation Points [ENDORSED]

How are the points recorded?
by MichaelMendozaD1F
Sat Oct 24, 2020 5:11 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Maximum Mass
Replies: 3
Views: 63

Re: Calculating Maximum Mass

hi, I finished this problem, but I had a question regarding the Na in the sodium hydroxide, where did it go? did we not include it in the ionic equation because it does not contain elements that formed the precipitate ? the products do not contain any Na molecules so I was curious as to where they w...
by MichaelMendozaD1F
Fri Oct 23, 2020 12:46 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm 1
Replies: 18
Views: 189

Re: Midterm 1

Hey, I believe Heisenberg will be there since it was covered on the modules. Things to know related to this: 1) There is an indeterminacy in smaller objects as their momentum and velocity is unknown when interacting with light. For an object like a baseball, we can determine their position and mome...
by MichaelMendozaD1F
Fri Oct 23, 2020 12:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Nomenclature
Replies: 3
Views: 37

Re: Midterm Nomenclature

thank you! I was wondering the same thing since certain compounds are very tricky based on their placement and state of matter.
by MichaelMendozaD1F
Fri Oct 23, 2020 12:38 pm
Forum: Student Social/Study Group
Topic: Midterm Practice
Replies: 5
Views: 46

Re: Midterm Practice

based off feedback from my TA and Lavelle, the best review will come from the fundamental problems in the syllabus. However, his modules should also help as they are audio visual with a assessment portion that will count as even further review. Good luck!
by MichaelMendozaD1F
Fri Oct 23, 2020 12:34 pm
Forum: Balancing Chemical Reactions
Topic: L.3 Fundamental Question
Replies: 3
Views: 34

L.3 Fundamental Question

Compounds that can be used to store hydrogen in vehicles are being actively sought. One reaction being studied for hydrogen storage is Li3N(s) 1 2 H2(g) S LiNH2(s) 1 2 LiH(s). (a) What amount (in moles) of H2 is needed to react with 1.5 mg of Li3N? (b) Calculate the mass of Li3N that will produce 0....
by MichaelMendozaD1F
Fri Oct 23, 2020 12:32 pm
Forum: Balancing Chemical Reactions
Topic: L.1 Fundamental Question
Replies: 2
Views: 34

L.1 Fundamental Question

Without using a calculator, estimate what amount of Br2 (in moles) can be obtained from 0.30 mol ClO2 in the reaction 6 ClO2(g) 1 2 BrF3(l) S 6 ClO2F(s) 1 Br2(l).
by MichaelMendozaD1F
Mon Oct 19, 2020 10:31 am
Forum: DeBroglie Equation
Topic: De Broglie Equation cut off
Replies: 6
Views: 52

De Broglie Equation cut off

What is considered too small to calculate? 10^-38 and 10^-34 are too small to be measured yet 10^-10 is measurable. What is the cut off for detection?
by MichaelMendozaD1F
Mon Oct 19, 2020 10:07 am
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 75
Views: 48896

Re: How to find my posts

I had trouble with this as well, as I submit all of my posts in one day, but today my posts had way less recorded. I hope this error will be fixed.
by MichaelMendozaD1F
Mon Oct 19, 2020 10:05 am
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 476

Re: What is Black Body?

I believe this concept will not be fully addressed until a more advanced chem lesson, however, I do recall him mentioning it being all consuming. I expect it to be in Chem 14B or further.
by MichaelMendozaD1F
Mon Oct 19, 2020 10:04 am
Forum: Molarity, Solutions, Dilutions
Topic: Photoelectric Effect
Replies: 6
Views: 103

Re: Photoelectric Effect

I am also struggling with this topic in photoelectric effect, is there more review in the book? or is the sapling homework a better resource?
by MichaelMendozaD1F
Mon Oct 19, 2020 10:02 am
Forum: Administrative Questions and Class Announcements
Topic: Built-in webcams/Equipment request [ENDORSED]
Replies: 22
Views: 698

Re: Built-in webcams/Equipment request [ENDORSED]

has there been an update about this requirement?
by MichaelMendozaD1F
Thu Oct 15, 2020 3:05 pm
Forum: SI Units, Unit Conversions
Topic: Webcam
Replies: 11
Views: 107

Webcam

Is the requirement of a webcam determined by our TA? or is it mandated by DR. Lavelle?
by MichaelMendozaD1F
Mon Oct 12, 2020 10:21 am
Forum: Properties of Light
Topic: Quanta and Photons
Replies: 19
Views: 158

Quanta and Photons

what exactly does "transferable" unit mean in the statement "However very sensitive experiment would show smallest 'transferable' unit is one (discrete) H20 molecule".
by MichaelMendozaD1F
Thu Oct 08, 2020 9:06 pm
Forum: Balancing Chemical Reactions
Topic: Fundamental Question E.17
Replies: 3
Views: 37

Fundamental Question E.17

E.17 Which sample in each of the following pairs contains the greater number of moles of atoms? (a) 75 g of indium or 80 g of tellurium; (b) 15.0 g of P or 15.0 g of S; (c) 7.36 3 1027 atoms of Ru or 7.36 3 1027 atoms of Fe.
(C in particular is becoming an issue for me)
by MichaelMendozaD1F
Thu Oct 08, 2020 9:03 pm
Forum: Balancing Chemical Reactions
Topic: Periodic Table
Replies: 50
Views: 405

Re: Periodic Table

I believe we will be provided a periodic table, or allowed one, for every midterm or exam in Chem 40A :) hope you are well!
by MichaelMendozaD1F
Thu Oct 08, 2020 9:01 pm
Forum: Balancing Chemical Reactions
Topic: Fundamental Question E.23
Replies: 3
Views: 82

Fundamental Question E.23

E.23 Calculate the amount (in moles) of (a) Cu21 ions in 3.00 g of
CuBr;(b)SO moleculesin7.003102 mgofSO;(c)F2 ionsin 233
25.2 kg of UF6; (d) H2O in 2.00 g of Na2CO3?10H2O.
(I am confused as to why there are ions and what to convert them to if need be)
by MichaelMendozaD1F
Thu Oct 08, 2020 8:58 pm
Forum: Balancing Chemical Reactions
Topic: butane balancing equation question
Replies: 6
Views: 90

Re: butane balancing equation question

I was able to calculate the net moles of gas by adding the stoichiometric coefficients of the "reactants" side of the equation, which will be 30, and then did the same to the "products" side of the equation to get 36. I then got a difference of 6 by subtracting moles of reactant ...
by MichaelMendozaD1F
Thu Oct 08, 2020 8:51 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental Question E.9
Replies: 4
Views: 54

Fundamental Question E.9

E.9 Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. (a) How many atoms of oxygen are in 5.15 g of Epsom salts? (b) How many formula units of the compound are present in 5.15 g? (c) How many moles of water molecules are in 5.15 g of Epsom salts? (most difficulty is stemming ...

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