Search found 69 matches

by Gerardo Ortega 2F
Sat Jan 16, 2021 7:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Finding Equilibrium Concentrations
Replies: 5
Views: 22

Re: Finding Equilibrium Concentrations

If you are given nonzero initial concentrations for all of the reactants and products, you would be able to find the Q of the reaction. Then, you would be able to compare your Q to the given equilibrium constant K. If Q<K, then the reaction will shift towards the products and if Q>K, the reaction wi...
by Gerardo Ortega 2F
Sat Jan 16, 2021 7:16 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle with Temperature
Replies: 7
Views: 27

Re: Le Chatelier's Principle with Temperature

Exothermic is negative because the reaction releases energy whereas endothermic is positive because it absorbs energy. I like to think of heat as a product in an exothermic reaction (exothermic releases heat) and heat as a reactant in an endothermic reaction (endothermic requires heat). Increasing t...
by Gerardo Ortega 2F
Sat Jan 16, 2021 7:03 pm
Forum: Polyprotic Acids & Bases
Topic: What Does Monoprotic Mean?
Replies: 8
Views: 27

Re: What Does Monoprotic Mean?

Monoprotic acids can only donate one H+ ion, hence the "mono" in the name. Other acids that can donate more than H+ ion, such as H2SO4, are polyprotic acids
by Gerardo Ortega 2F
Sat Jan 16, 2021 7:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw constant
Replies: 25
Views: 50

Re: Kw constant

[H2O] is left out if water is the solvent. As Dr. Lavelle mentioned in yesterday's lecture, any other solvent such as ethanol would be left out of the equilibrium constant as well.
by Gerardo Ortega 2F
Sat Jan 16, 2021 6:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Using the ICE table
Replies: 32
Views: 79

Re: Using the ICE table

Yes, the ICE table can be used to find equilibrium concentrations of a reaction as well as the equilibrium partial pressures.
by Gerardo Ortega 2F
Thu Jan 07, 2021 7:00 pm
Forum: Ideal Gases
Topic: Ideal Gas Law Question
Replies: 11
Views: 52

Re: Ideal Gas Law Question

We consider T to be a constant when the question states that a particular chemical reaction occurs at a constant temperature.
by Gerardo Ortega 2F
Thu Jan 07, 2021 6:58 pm
Forum: Ideal Gases
Topic: Partial Pressure Gas Question
Replies: 4
Views: 23

Re: Partial Pressure Gas Question

That is the equation I used as well. If you apply the given concentrations as n/V and 312 K as the temperature, you should be able to get one of the answers listed.
by Gerardo Ortega 2F
Thu Jan 07, 2021 6:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Assignments
Replies: 26
Views: 133

Re: Sapling Assignments

Those assignments are optional. The only assignments that are due for credit are the weekly Sapling assignments and the 5 weekly chemistry community posts.
by Gerardo Ortega 2F
Mon Jan 04, 2021 10:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Dr. Lavelle's Disc Link
Replies: 3
Views: 23

Re: Dr. Lavelle's Disc Link

I tried looking for the link and couldn't find it either
by Gerardo Ortega 2F
Mon Jan 04, 2021 9:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Question
Replies: 3
Views: 31

Re: Sapling Question

I think it's because most students bought the multi-term access $72 textbook in chem 14A last quarter, which grants access for more than one quarter. If you won't be needing the textbook beyond this class the cheaper option should be fine.
by Gerardo Ortega 2F
Wed Dec 16, 2020 11:28 am
Forum: Student Social/Study Group
Topic: Anxiety
Replies: 38
Views: 226

Re: Anxiety

I try looking towards the future. Since this was my first quarter at UCLA, I hope to learn from my mistakes and improve my study habits so that I can do better in 14B.
by Gerardo Ortega 2F
Wed Dec 16, 2020 11:24 am
Forum: *Titrations & Titration Calculations
Topic: Is this a 14B topic? [ENDORSED]
Replies: 8
Views: 78

Re: Is this a 14B topic? [ENDORSED]

Yes, 14B goes more in depth about weak acids and bases. I recall using variables to calculate weak acid/base concentration when taking AP Chemistry in high school.
by Gerardo Ortega 2F
Wed Dec 16, 2020 11:21 am
Forum: Student Social/Study Group
Topic: Winter Break
Replies: 44
Views: 248

Re: Winter Break

I would just skim my lecture notes to refresh my memory on essential 14A topics.
by Gerardo Ortega 2F
Wed Dec 16, 2020 11:19 am
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 97
Views: 452

Re: Plans for Relaxing After Finals

I'm looking forward to learning how to play the guitar with all of the free time I will have!
by Gerardo Ortega 2F
Sat Dec 12, 2020 9:29 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating ligands
Replies: 4
Views: 34

Re: Chelating ligands

I think in general outline 5 topics will not be covered extensively on the final because we did not spend much time on those topics.
by Gerardo Ortega 2F
Sun Dec 06, 2020 1:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 21
Views: 135

Re: Final

Yes the final will be conducted similar to the midterms. The main difference for the final is that everyone will take the exam at the same time (except for international students who have an alternative time to accommodate their distance).
by Gerardo Ortega 2F
Sun Dec 06, 2020 1:01 pm
Forum: Naming
Topic: Naming Practice
Replies: 4
Views: 39

Re: Naming Practice

Thank you for the resources! I definitely need to practice naming coordination compounds.
by Gerardo Ortega 2F
Sun Dec 06, 2020 12:10 pm
Forum: Bronsted Acids & Bases
Topic: What makes a molecule an acid?
Replies: 3
Views: 22

Re: What makes a molecule an acid?

Malakai Espinosa 3D wrote:It's not necessarily that the HBr molecule is the lewis acid itself, but it is providing the Lewis acid which is the H+.


You're right I got a bit mixed up in my original reply thanks for clearing up the confusion for the OP!
by Gerardo Ortega 2F
Sun Dec 06, 2020 12:05 pm
Forum: Bronsted Acids & Bases
Topic: What makes a molecule an acid?
Replies: 3
Views: 22

Re: What makes a molecule an acid?

In this particular case, when HBr donates its H+ ion to a Bronsted base, Br keeps the electron pair of the hydrogen, thus fulfilling the Lewis acid definition of accepting a pair of nonbonding electrons.
by Gerardo Ortega 2F
Sun Dec 06, 2020 12:02 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and pOH
Replies: 6
Views: 45

Re: pH and pOH

pH is the negative logarithm of [H+] while pOH is the negative logarithm of [OH-]. We typically use pH instead of pOH.
by Gerardo Ortega 2F
Fri Nov 27, 2020 10:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Outlines for the Final
Replies: 11
Views: 107

Re: Outlines for the Final

They will be covered before the final exam. Outline 5 should not take too long to finish, and there should be enough time to cover everything from Outline 6 by the end of week 10.
by Gerardo Ortega 2F
Fri Nov 27, 2020 10:39 pm
Forum: Sigma & Pi Bonds
Topic: Sapling Learning Week 7 and 8 Homework Question 16
Replies: 4
Views: 22

Re: Sapling Learning Week 7 and 8 Homework Question 16

What I did when solving this problem was write out the possible Lewis structures for each molecule. For the molecules that have more than one possible Lewis structure, I came to the conclusion that they were resonance structures and have delocalized pi bonds.
by Gerardo Ortega 2F
Fri Nov 27, 2020 10:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ring Structures
Replies: 9
Views: 54

Re: Ring Structures

I would practice drawing ring structures just in case they show up on the final exam.
by Gerardo Ortega 2F
Fri Nov 27, 2020 10:22 pm
Forum: Hybridization
Topic: Single Bonds and Sigma Bonds
Replies: 23
Views: 111

Re: Single Bonds and Sigma Bonds

Every covalent bond has one sigma bond and a certain number of pi bonds. Single bonds have 1 sigma and 0 pi bonds, double bonds have 1 sigma and 1 pi bond, and triple bonds have 1 sigma and 2 pi bonds.
by Gerardo Ortega 2F
Fri Nov 27, 2020 10:16 pm
Forum: Student Social/Study Group
Topic: Sampling Give Up Option
Replies: 12
Views: 98

Re: Sampling Give Up Option

You lose points because sapling will no longer let you give a response to that question you gave up on.
by Gerardo Ortega 2F
Sun Nov 22, 2020 2:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Theory
Replies: 5
Views: 54

Re: VSEPR Theory

Thanks for clarifying. I was confused about this as well. To go off topic, but if the VSEPR theory is used to described electron pairs, how would it work in terms of radicals such as CH3? Radicals are highly reactive, so they will have a higher chance of reacting with another atom to form another c...
by Gerardo Ortega 2F
Sun Nov 22, 2020 1:58 pm
Forum: Trends in The Periodic Table
Topic: Ionic Character
Replies: 11
Views: 92

Re: Ionic Character

When determining covalent character in an ion, you want to focus on the polarizing power of the cation and the polarizability of the anion. The smaller, more positively charged a cation is, the more polarizing power it has. The larger an anion is, the more polarizable it is because the larger electr...
by Gerardo Ortega 2F
Sun Nov 22, 2020 1:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Week 7 Sapling: #5
Replies: 4
Views: 26

Re: Week 7 Sapling: #5

Adding to previous replies, the way I like to think of it - this is how the Sapling homework described it to me after I checked my solution - is that axial atoms are lined up vertically like the North and South pole while equatorial atoms are lined up horizontally like the Earth's equator.
by Gerardo Ortega 2F
Sun Nov 22, 2020 1:46 pm
Forum: General Science Questions
Topic: # of chem posts
Replies: 27
Views: 323

Re: # of chem posts

Giselle_zamora_3E wrote:hi so does this mean that if we missed a couple of posts some weeks, we cannot make them up by posting more in following weeks ?


Unfortunately I don't think you can make those points up because Dr. Lavelle said that there must be a minimum of 5 posts per week to get the full points for that week.
by Gerardo Ortega 2F
Sun Nov 22, 2020 1:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Overlapping Orbitals
Replies: 3
Views: 18

Re: Overlapping Orbitals

To add to the previous replies, there can only be one sigma bond per orbital overlap.
by Gerardo Ortega 2F
Sun Nov 15, 2020 11:34 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity difference
Replies: 12
Views: 89

Re: Electronegativity difference

I don't think the midterm will require us to do any calculations involving electronegativity difference unless the electronegativity values of the involved elements are provided.
by Gerardo Ortega 2F
Sun Nov 15, 2020 11:29 am
Forum: Dipole Moments
Topic: Sapling number 17
Replies: 10
Views: 78

Re: Sapling number 17

CH4 is a nonpolar molecule because the 4 C-H bond dipoles cancel each other out and there are no lone pairs present in the central atom to bend the molecule. Nonpolar molecules only experience London dispersion forces and not other intermolecular forces like dipole-dipole that polar molecules can ex...
by Gerardo Ortega 2F
Sun Nov 15, 2020 11:24 am
Forum: Resonance Structures
Topic: Resonance
Replies: 19
Views: 100

Re: Resonance

Adding to the previous comments, an optimal resonance structure tends to have a negative charge on the most electronegative atom in the molecule.
by Gerardo Ortega 2F
Sun Nov 15, 2020 11:18 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 9
Views: 76

Re: Writing Electron Configurations

The electron configuration was organized that way because 5s (n=5) is in a higher energy level than 4d (n=4). 5s electrons are removed easier than 4d electrons.
by Gerardo Ortega 2F
Sun Nov 15, 2020 11:15 am
Forum: Administrative Questions and Class Announcements
Topic: #Questions on Midterm 2
Replies: 6
Views: 52

Re: #Questions on Midterm 2

I think there will definitely be more questions this time around since it was easy to lose points on the last midterm because there were only 12 questions.
by Gerardo Ortega 2F
Sun Nov 08, 2020 2:03 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of the Same Element
Replies: 15
Views: 60

Re: Formal Charge of the Same Element

The formal charge can be different in some cases. For example, in Dr. Lavelle's lecture 14, he adds 2 more covalent bonds to the central atom S in SO4(2-). Adding more covalent bonds to the central atom made the formal charge of 2 Oxygen atoms 0 while the other 2 remained -1.
by Gerardo Ortega 2F
Sun Nov 08, 2020 1:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Electronegativity & Formal Charge
Replies: 3
Views: 24

Re: Electronegativity & Formal Charge

The central atom should not have a charge because it is more stable when its formal charge is 0. Sometimes the formal charge of the central atom may be negative or positive, in which case you add more covalent bonds to the central atom.
by Gerardo Ortega 2F
Sun Nov 08, 2020 1:55 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Study Group
Replies: 25
Views: 152

Re: Midterm 2 Study Group

Sounds good, see you on GroupMe!
by Gerardo Ortega 2F
Sun Nov 08, 2020 1:54 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 110
Views: 1171

Re: grade worries

I am just worried about how difficult the next exams might be and how they will impact my grade.
by Gerardo Ortega 2F
Sun Nov 08, 2020 1:51 pm
Forum: Lewis Structures
Topic: Oxidation Numbers
Replies: 7
Views: 30

Re: Oxidation Numbers

I don't see it on the outline for chemical bonds so it might have been a mistake.
by Gerardo Ortega 2F
Sun Nov 01, 2020 12:11 am
Forum: Trends in The Periodic Table
Topic: Sapling HW #30
Replies: 6
Views: 64

Re: Sapling HW #30

Hello, to add to the replies before me, the way I like to think of it is through electron-electron repulsion and coulombic attraction. Rb+ would have the smallest ionic radius because there are less inner electrons shielding the outer electrons from coulombic attraction with the protons in the nucle...
by Gerardo Ortega 2F
Sun Nov 01, 2020 12:01 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity #23
Replies: 4
Views: 24

Re: Electron Affinity #23

I used 4 sig figs for both my first answer and my second answer
by Gerardo Ortega 2F
Sat Oct 31, 2020 11:58 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity #23
Replies: 4
Views: 24

Re: Electron Affinity #23

Your setup is the same way I solved it and I ended up getting it right. Maybe it's the number of sig figs?
by Gerardo Ortega 2F
Sat Oct 31, 2020 11:56 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 595

Re: How to relax

I like to distract myself with relaxing music while laying down. The music can range from video game music (one song I like to listen to is "Dearly Beloved" from Kingdom Hearts) to classical music.
by Gerardo Ortega 2F
Tue Oct 27, 2020 7:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 1014

Re: Participation Points [ENDORSED]

Awesome, thank you for clarifying!
by Gerardo Ortega 2F
Tue Oct 27, 2020 6:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 1014

Re: Participation Points [ENDORSED]

To add to this question, if we post more than 5 times in a week, will the extra posts count for points as well or is it limited to 5 points per week?
by Gerardo Ortega 2F
Sat Oct 24, 2020 10:48 am
Forum: Einstein Equation
Topic: Homework Problem 1A.3
Replies: 4
Views: 46

Re: Homework Problem 1A.3

Adding to the previous reply, another way of thinking about it is that the electromagnetic waves become wider when frequency decreases, thus making the peaks and troughs of the waves smaller.
by Gerardo Ortega 2F
Sat Oct 24, 2020 10:42 am
Forum: Molarity, Solutions, Dilutions
Topic: molar mass and g/mol
Replies: 2
Views: 43

Re: molar mass and g/mol

Yes, you should use g/mol unless the question says otherwise.
by Gerardo Ortega 2F
Thu Oct 22, 2020 10:04 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 441

Re: m vs nm

Wavelength values are usually given in nm but if the question says to give the answer in m then you should give it in m.
by Gerardo Ortega 2F
Thu Oct 22, 2020 9:54 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: post module assessment #44
Replies: 2
Views: 21

Re: post module assessment #44

I did the same thing as you, using the equation En=-hR/n^2 and subtracting final - initial. When I got the energy difference, I used the equation E = hc/lambda to solve for the wavelength. My final answer was 9.73*10^-8 m. Maybe there was just a calculation error?
by Gerardo Ortega 2F
Wed Oct 21, 2020 9:03 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 3
Views: 33

Re: Schrodinger's Equation

Schrodinger's Equation is used to identify the probability of finding an electron (electron density). This probability is represented by Ψ^2. One thing to keep in mind is that nodes have zero probability density.
by Gerardo Ortega 2F
Wed Oct 21, 2020 8:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 1D.13
Replies: 4
Views: 24

Re: Problem 1D.13

For (a) 1.D.13 the answer sheet actually says that the answer is 7. This is because when n=7, the possible l values are 0,1,2,3,4,5, and 6.
by Gerardo Ortega 2F
Tue Oct 20, 2020 10:02 pm
Forum: Properties of Light
Topic: Relationship between intensity and amplitude
Replies: 3
Views: 47

Re: Relationship between intensity and amplitude

If I recall the professor did mention this relationship during one of his lectures. The intensity of a wave is the square of its amplitude. I think it's a good idea to keep this relationship in mind but I'm not entirely sure if it will be important in the coming weeks of the course.
by Gerardo Ortega 2F
Sat Oct 17, 2020 7:29 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Photon Frequency and Energy Between Ground States
Replies: 3
Views: 13

Re: Photon Frequency and Energy Between Ground States

If a photon has a frequency that exceeds the energy difference between different energy levels, the electron would not move from one energy level to another because electrons in an atom have discrete energies, meaning that any photon that does not have energy equal to the energy difference between e...
by Gerardo Ortega 2F
Sat Oct 17, 2020 7:15 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 6
Views: 53

Re: Wave Properties of Electrons

When the electrons passed through the crystal, they displayed a diffraction pattern, which is a wave-like property.
by Gerardo Ortega 2F
Sat Oct 17, 2020 7:10 pm
Forum: Properties of Light
Topic: Atomic Spectra Module Question #28
Replies: 4
Views: 52

Re: Atomic Spectra Module Question #28

The order of longest to shortest region wavelengths in the electromagnetic spectrum are: radio waves, microwaves, infrared, visible light, ultraviolet, x rays, and gamma rays. Radio waves typically range from 1 m to 1,000 m Microwaves range from 1 mm to 1 m Infrared waves range from 700 nm to 1 mm V...
by Gerardo Ortega 2F
Wed Oct 14, 2020 4:50 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post module #19
Replies: 2
Views: 29

Re: Post module #19

So you start off with Heisenberg's uncertainty principle: (delta x) * (delta p) >/= h/4pi . The question gives you the value of delta x (uncertainty in position), so you substitute it to solve for delta p. H is Planck's constant: 6.626*10^-34 J*s. Once you find your delta p value (uncertainty in mom...
by Gerardo Ortega 2F
Wed Oct 14, 2020 4:38 pm
Forum: Properties of Light
Topic: intensity, photons, and frequency
Replies: 7
Views: 58

Re: intensity, photons, and frequency

So intensity is proportional to the number of photons, which is proportional to the number of electrons ejected. However, the number of photons is not proportional to frequency. If the energy of the photons does not meet the work function (minimum energy required to eject an electron), then no elect...
by Gerardo Ortega 2F
Wed Oct 14, 2020 4:32 pm
Forum: DeBroglie Equation
Topic: Wavelengths and DeBroglie
Replies: 7
Views: 87

Re: Wavelengths and DeBroglie

Objects that exhibit wavelike properties have a small mass and high velocity. In the case of a baseball, since it has a large mass and short wavelength, it does not exhibit wavelike properties.
by Gerardo Ortega 2F
Mon Oct 12, 2020 3:40 pm
Forum: Properties of Light
Topic: Question about amount of energy needed to emit electrons
Replies: 6
Views: 45

Re: Question about amount of energy needed to emit electrons

The energy of a photon can be equal to the work function (energy required to remove an electron) because the work function is the minimum amount required. Any excess energy resulting from E(photon) - E(energy to remove e-) does not correlate to excess electrons, but rather the kinetic energy of each...
by Gerardo Ortega 2F
Sat Oct 10, 2020 7:49 pm
Forum: SI Units, Unit Conversions
Topic: Rounding
Replies: 20
Views: 160

Re: Rounding

If the problem has multiple steps, you should leave the values you get after each step in your calculator and round at the very end to ensure that your final answer is as accurate as possible.
by Gerardo Ortega 2F
Fri Oct 09, 2020 11:39 pm
Forum: Properties of Light
Topic: Electromagnetic fields
Replies: 1
Views: 21

Re: Electromagnetic fields

So basically the number of electron dense areas in a molecule dictate its shape. For example, if a molecule has 3 areas of electron density, it will have a trigonal planar shape. I'm sure we'll go more into detail about molecular shape and structure later on in the course but this is a simple explan...
by Gerardo Ortega 2F
Fri Oct 09, 2020 11:27 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Heisenberg Uncertainty Principles
Replies: 1
Views: 30

Re: Heisenberg Uncertainty Principles

So what I did for this question was multiply the estimated radius of the Hydrogen atom 0.05 nm by 0.01 (1% accuracy) to find delta x (uncertainty in position). Since we know that the mass of an electron is 9.11*10^-31 kg and momentum (p) = mass (m) * velocity (v), we can substitute the m and delta x...
by Gerardo Ortega 2F
Fri Oct 09, 2020 11:20 pm
Forum: Limiting Reactant Calculations
Topic: Best way to find limiting reactant
Replies: 5
Views: 97

Re: Best way to find limiting reactant

This is my personal preference but I find myself using method #2 more often than method #1. Method #2 is especially convenient when there are more than 2 reactants present. When there are 3+ reactants, using the molar ratios between each reactant and one of the products is less confusing than compar...
by Gerardo Ortega 2F
Wed Oct 07, 2020 11:35 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.9
Replies: 3
Views: 35

Re: E.9

Formula units refers to an ionic compound's molar mass, in this case MgSO4. You are measuring the compound's mass per mole of its formula units. To find this value, you use Avogadro's number to cancel the number of moles, similar to part A when finding the number of atoms.
by Gerardo Ortega 2F
Wed Oct 07, 2020 11:15 am
Forum: Empirical & Molecular Formulas
Topic: Fundamentals Section F.19
Replies: 5
Views: 46

Re: Fundamentals Section F.19

I think you may have accidentally been looking at F.18 for the H percentage. The H percentage for F.19 is actually 5.19, not 6.02.
by Gerardo Ortega 2F
Wed Oct 07, 2020 11:08 am
Forum: Significant Figures
Topic: How man Sig Figs to use in the Textbook Problems
Replies: 7
Views: 80

Re: How man Sig Figs to use in the Textbook Problems

If the question has given values, you go off of the value with the least amount of sig figs to determine how many sig figs your final answer should have. However, when the problem does not have given values, determining the number of sig figs your answer should have becomes tricky.
by Gerardo Ortega 2F
Mon Oct 05, 2020 12:06 pm
Forum: Balancing Chemical Reactions
Topic: L.35
Replies: 9
Views: 113

Re: L.35

Selena Quispe 2G wrote:Hi! There was a typo for this problem. It should have been typed Fe3Br8 + 4Na2CO3 --> 8NaBr+ 4CO2 + Fe3O4.

Thank you!
by Gerardo Ortega 2F
Mon Oct 05, 2020 12:04 pm
Forum: Balancing Chemical Reactions
Topic: L.35
Replies: 9
Views: 113

Re: L.35

I was having trouble with this problem too. No matter what I tried, the O's didn't add up on both sides.

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