Search found 66 matches

by Brianne Conway 1D
Wed Jan 20, 2021 8:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find textbook answers
Replies: 4
Views: 20

Re: Where to find textbook answers

you can find it on Sapling under Resources. It is a PDF called "Atkins 7e SSM".
by Brianne Conway 1D
Wed Jan 20, 2021 8:49 pm
Forum: Phase Changes & Related Calculations
Topic: bonds and energy
Replies: 11
Views: 32

Re: bonds and energy

a vapor becoming a liquid does not need energy to form bonds; forming bonds always gives off energy. this isn't necessarily related to your question, but it might help clarify: an endothermic reaction doesn't mean that it requires energy to form the bonds, it means that the energy required to break ...
by Brianne Conway 1D
Thu Jan 14, 2021 10:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in Partial Pressure
Replies: 2
Views: 24

Change in Partial Pressure

Just to clarify, if a question says a reaction is at equilibrium and then asks about the effect of changing the partial pressure of one of the products/reactants, would that not affect the overall pressure of the reaction vessel? For example, question 5J.9 in the textbook gives the equation 3NH3 + 5...
by Brianne Conway 1D
Thu Jan 14, 2021 7:14 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 9
Views: 60

Re: Gas constant

Yeah, so the R is used in the ideal gas law equation PV=nRT, because while PV is proportional to nT, it is the R value that makes the whole ideal gas equation true and helpful for calculations. Now the units for R can be many different things such as J/K·mol, L·atm/K·mol, L·bar/K·mol, and L·Torr/K·...
by Brianne Conway 1D
Wed Jan 13, 2021 6:06 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 9
Views: 60

Gas constant

I noticed that on the equations and constant sheet, there are two values of the gas constant, 8.314 J mol-1 K-1 and 0.08205 L atm mol-1 K-1. I was confused about how to know which one to use because in my discussion section the TA used the first one but with the units of the second one. I thought yo...
by Brianne Conway 1D
Wed Jan 13, 2021 5:58 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 212
Views: 142748

Re: Rusty on High School Chem [ENDORSED]

I'm a first year and I hadn't taken a chem class since junior year of high school either. For me personally, Khan Academy is a good way to learn and review chemistry topics. That's what helped me get through AP chem haha.
by Brianne Conway 1D
Wed Jan 13, 2021 5:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8520
Views: 1472216

Re: Post All Chemistry Jokes Here

Why did the white bear dissolve in water? Because it was polar!
by Brianne Conway 1D
Wed Jan 13, 2021 5:50 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8520
Views: 1472216

Re: Post All Chemistry Jokes Here

Why does a hamburger have less energy than steak? Because it's in the ground state!
by Brianne Conway 1D
Wed Jan 13, 2021 5:49 pm
Forum: Student Social/Study Group
Topic: New Joke Chain
Replies: 32
Views: 98

Re: New Joke Chain

Why does a hamburger have less energy than steak? Because it's in the ground state!
by Brianne Conway 1D
Fri Jan 08, 2021 3:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in pressure = same volume
Replies: 3
Views: 26

Re: Change in pressure = same volume

To add on to what Mikayla said, the concentrations of the gases that were already in the container stay the same, but altogether there will be more moles of gas in the container since an inert gas was added. That's why the pressure increases even when the volume stays the same, because if you look a...
by Brianne Conway 1D
Fri Jan 08, 2021 3:14 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 596

Re: How to relax

I like to watch Netflix, cuddle with my cat, and read. I also play the piano every once in a while or do cross-stitching or knitting, but unfortunately I haven't had a lot of time to do those things recently.
by Brianne Conway 1D
Fri Jan 08, 2021 3:13 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 596

Re: How to relax

I like to watch Netflix, cuddle with my cat, and read. I also play the piano every once in a while or do cross-stitching or knitting, but unfortunately I haven't had a lot of time to do those things recently.
by Brianne Conway 1D
Fri Jan 08, 2021 3:12 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 596

Re: How to relax

I like to watch Netflix, cuddle with my cat, and read. I also play the piano every once in a while or do cross-stitching or knitting, but unfortunately I haven't had a lot of time to do those things recently.
by Brianne Conway 1D
Fri Jan 08, 2021 3:09 pm
Forum: Student Social/Study Group
Topic: Final Exam Study Tips
Replies: 48
Views: 244

Re: Final Exam Study Tips

I definitely learned from my mistakes in 14A and have changed my study habits for this quarter. Going to the UA workshops and step up sessions are super helpful and it's something I totally regret not starting earlier last quarter!! Same, I never went to any of the sessions last quarter but I'm gon...
by Brianne Conway 1D
Fri Jan 08, 2021 3:09 pm
Forum: Student Social/Study Group
Topic: Final Exam Study Tips
Replies: 48
Views: 244

Re: Final Exam Study Tips

I definitely learned from my mistakes in 14A and have changed my study habits for this quarter. Going to the UA workshops and step up sessions are super helpful and it's something I totally regret not starting earlier last quarter!! Same, I never went to any of the sessions last quarter but I'm gon...
by Brianne Conway 1D
Fri Jan 08, 2021 3:06 pm
Forum: Student Social/Study Group
Topic: Final Exam Study Tips
Replies: 48
Views: 244

Re: Final Exam Study Tips

Hi! I was wondering how everyone will be studying for the final. Since it will be cumulative I don't know where to start studying. Does anyone have any tips? Thank you in advance! Hi, personally, I didn't study incredibly well last quarter and did worse than I wanted to, so this quarter I'm trying ...
by Brianne Conway 1D
Sat Dec 12, 2020 9:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate Ligands
Replies: 5
Views: 64

Re: Polydentate Ligands

For those textbook problems, I drew out the Lewis structures and looked for atoms that had lone pairs. For example, for water, the oxygen has lone pairs, so it can be a monodentate ligand (it's not a bidentate ligand because the two lone pairs are on the same bonding site). At the UA session earlie...
by Brianne Conway 1D
Fri Dec 11, 2020 5:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 6
Views: 37

Re: Bond Angles

As others have said, lone pairs are spread out more since they are not held between two positively charged nuclei. So if an atom has a lone pair the bond angles will be slightly less than the normal angles for that shape. You don't need to know the exact angle, just that it will be slightly less due...
by Brianne Conway 1D
Fri Dec 11, 2020 5:15 pm
Forum: Lewis Structures
Topic: Tips on drawing Lewis structures
Replies: 20
Views: 144

Re: Tips on drawing Lewis structures

Hi! So I like to calculate how many valence electrons I should have and then count the electrons again to make sure that I have drawn the lewis structure correctly. Also calculate the formal charges and remember you want the most stable/less charged structure. However, if you do have a charge like ...
by Brianne Conway 1D
Fri Dec 11, 2020 5:10 pm
Forum: Calculating the pH of Salt Solutions
Topic: Hard Water vs. Soft Water
Replies: 9
Views: 63

Re: Hard Water vs. Soft Water

I thought Dr. Lavelle said soft water is more alkaline and that's why it feels soapy, but when I looked it up it says hard water is more alkaline because it has more minerals in it, so I'm really not sure anymore.
by Brianne Conway 1D
Fri Dec 11, 2020 5:06 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative Acidity
Replies: 7
Views: 58

Re: Relative Acidity

Steph Du 2B wrote:If the bond being broken for the compounds you are comparing is different, you compare bond length (ex. HCl and HBr). If the bond being broken is the same, then you compare electronegativity (ex. CCl3COOH and CH3COOH).


Thanks for that explanation, it really clears everything up nicely.
by Brianne Conway 1D
Fri Dec 11, 2020 4:56 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: angular and radial nodes
Replies: 2
Views: 18

Re: angular and radial nodes

I was wondering this as well and here is what I found online: "Radial node is a spherical surface where the probability of finding an electron is zero. The number of radial nodes increases with the principal quantum number (n). Angular node is also called a nodal plane. It is a plane that passe...
by Brianne Conway 1D
Tue Dec 01, 2020 10:22 pm
Forum: Student Social/Study Group
Topic: Happy Thanksgiving!
Replies: 38
Views: 285

Re: Happy Thanksgiving!

Happy late Thanksgiving! Our family doesn't really have a special tradition other than eating dinner together with my grandparents and watching football, but that's good enough for me :)
by Brianne Conway 1D
Tue Dec 01, 2020 10:17 pm
Forum: Naming
Topic: order of ligands [ENDORSED]
Replies: 6
Views: 106

Re: order of ligands [ENDORSED]

I was wondering about this too, but I don't think it matters too much since you're still able to determine the formula of the molecule.
by Brianne Conway 1D
Tue Dec 01, 2020 10:05 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate Ligands
Replies: 5
Views: 64

Polydentate Ligands

To determine if a ligand is polydentate and to specifically find how many places it can bind, do you have to draw the Lewis structure or is there some other intuitive way of knowing how many lone pairs it has? Asking because textbook exercise 9C.5 lists ligands and asks to identify which can be poly...
by Brianne Conway 1D
Thu Nov 26, 2020 12:54 pm
Forum: Hybridization
Topic: Sp3d or dsp3
Replies: 22
Views: 863

Re: Sp3d or dsp3

Dr. Lavelle said in his lecture that you can write it either way.
by Brianne Conway 1D
Thu Nov 26, 2020 12:51 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 867

Re: Big Sad: Midterm 2

I did slightly better on this midterm than the last. When I was looking at my grade for the second midterm though, I realized that the grade shown in the Grades tab on CCLE was the number of points out of 110 rather than the percentage, meaning I actually did worse on both midterms than I initially ...
by Brianne Conway 1D
Thu Nov 26, 2020 12:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 87

Re: coordination number

Yes, the coordination number is the number of bonds.
by Brianne Conway 1D
Mon Nov 16, 2020 2:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook problems 2A9 and 2A11
Replies: 3
Views: 21

Re: Textbook problems 2A9 and 2A11

It's asking for exactly what it says, M is an unknown metal whose ground-state electron configuration is given and we need to figure out what element M is. So you basically need to work backwards from how you normally would write an element's electron configuration. Just count the number of electron...
by Brianne Conway 1D
Mon Nov 16, 2020 2:35 pm
Forum: Electronegativity
Topic: Sapling #20
Replies: 2
Views: 38

Re: Sapling #20

1 is incorrect because fluorine actually has a smaller atomic radius; atomic radius decreases across a period due to higher effective nuclear charge. 4 is incorrect because oxygen and fluorine both have the 1s and 2s orbitals filled, so the 2p orbitals in both of them experience the same amount of s...
by Brianne Conway 1D
Mon Nov 16, 2020 2:23 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Textbook 2D.9
Replies: 4
Views: 45

Re: Textbook 2D.9

The bigger the atom is the more polarizing power it has, because it has more protons pulling on the electrons. Hence, Be would be the smallest and lowest, then Rb, then Sr. This means polarizing power goes up across a period and increases as u go down a group. It's true that a cation with a higher ...
by Brianne Conway 1D
Mon Nov 16, 2020 2:13 pm
Forum: Ionic & Covalent Bonds
Topic: hydrogen bonds
Replies: 4
Views: 44

Re: hydrogen bonds

Hydrogen bonds form between a hydrogen attached to a highly electronegative atom (N, O, or F) and another N, O, or F on another molecule.
by Brianne Conway 1D
Mon Nov 16, 2020 2:11 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Quantum number ms
Replies: 3
Views: 35

Re: Quantum number ms

I don't think we actually need to be able to determine if an electron is spin-up or spin-down; we just need to know +1/2 is spin up and -1/2 is spin down and that two electrons in the same orbital can't have the same spin state.
by Brianne Conway 1D
Mon Nov 16, 2020 2:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Updating Respondus Lockdown Browser
Replies: 8
Views: 219

Re: Updating Respondus Lockdown Browser

Open the LockDown Browser and in the upper left corner there's a button that has an i in a circle. Press on that and a box will pop up with a button in the middle that says "Check for newer version". Press on that and it'll say get newer version or something like that; press on that button...
by Brianne Conway 1D
Wed Nov 11, 2020 8:09 pm
Forum: Dipole Moments
Topic: Induced Dipole in Non Polar Molecules
Replies: 2
Views: 13

Re: Induced Dipole in Non Polar Molecules

Induced dipole induced dipole interactions occur in all molecules whether they are polar or nonpolar because induced dipole induced dipole refers to temporary fluctuations in electron density that cause dipoles to form. Thus, induced dipole induced dipole interactions occur in all molecules since al...
by Brianne Conway 1D
Wed Nov 11, 2020 8:05 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1292

Re: How are you studying?

I personally don't have any significant studying techniques. I just take notes on stuff mentioned in lecture that is new to me and/or that seems important. Additionally, I just make sure to do the homework and all of the textbook problems for practice and obviously go over problems I miss and try to...
by Brianne Conway 1D
Wed Nov 11, 2020 8:01 pm
Forum: Dipole Moments
Topic: Induced dipole interactions and H bonds
Replies: 2
Views: 12

Re: Induced dipole interactions and H bonds

Yes, that is correct. That's why in his lecture Dr. Lavelle showed examples of how molecules with the same molecular formula but different shapes can have different boiling points, since molecules of certain shapes have stronger induced dipole induced dipole interactions than others (which would inc...
by Brianne Conway 1D
Wed Nov 11, 2020 7:55 pm
Forum: Bond Lengths & Energies
Topic: Van der Waals
Replies: 7
Views: 92

Re: Van der Waals

Van der Waals interactions are induced dipole induced dipoles. They are just temporary fluctuations in electron density that can cause dipoles to form, leading different molecules to be attracted to each other.
by Brianne Conway 1D
Wed Nov 11, 2020 7:53 pm
Forum: Dipole Moments
Topic: Induced dipole vs permanent dipole
Replies: 3
Views: 20

Re: Induced dipole vs permanent dipole

Just as you said, permanent dipoles are from two atoms having different electronegativities (thus one atom will always be partially positive and the other partially negative). On the other hand, induced dipoles are temporary fluctuations in electron density that randomly cause dipoles to form.
by Brianne Conway 1D
Sat Nov 07, 2020 6:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Reviewing Answers for Midterm 1
Replies: 13
Views: 133

Re: Reviewing Answers for Midterm 1

I was about to ask this too, unfortunately I guess we can't review them. :/
by Brianne Conway 1D
Sat Nov 07, 2020 6:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 1014

Re: Participation Points [ENDORSED]

I was wondering this too and couldn't figure out where I'm supposed to click on my name, but I noticed that if you look at one of your posts, on the right hand side it says how many posts you've made, so as long as you have 5 posts per week you should get full credit.
by Brianne Conway 1D
Sat Nov 07, 2020 6:10 pm
Forum: Quantum Numbers and The H-Atom
Topic: 4th quantum number
Replies: 8
Views: 45

Re: 4th quantum number

I don't think we need to actually "determine" any of the quantum numbers, we just need to know what they mean. So you just need to know that +1/2 is spin-up and -1/2 is spin-down.
by Brianne Conway 1D
Sat Nov 07, 2020 6:08 pm
Forum: Electronegativity
Topic: Confusion between electronegativity and electron affinity
Replies: 15
Views: 109

Re: Confusion between electronegativity and electron affinity

I was also wondering about this because I remember learning about electronegativity but not electron affinity when discussing periodicity in high school chem, but now we only talked about electron affinity and not electronegativity. Also, they sound pretty similar, but I am not sure if they are the ...
by Brianne Conway 1D
Sat Nov 07, 2020 5:59 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Can you have the same 3 quantem number but not the 4 same quantem numbers
Replies: 12
Views: 63

Re: Can you have the same 3 quantem number but not the 4 same quantem numbers

Yes you can have the same 3 quantum numbers since each orbital can hold two electrons. Thus, two electrons in the same orbital would have the same first three quantum numbers but have a different spin state.
by Brianne Conway 1D
Wed Oct 28, 2020 9:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 9
Views: 67

Re: Rydberg Equation

n2 represents the excited state the electron is in, while n1 represents the energy level that the electron returns to. n2 is always greater than n1. I may be wrong, but that's the way I think about the Rydberg Equation. Yeah, that's what I realized is probably the case as I thought about it more, w...
by Brianne Conway 1D
Wed Oct 28, 2020 9:16 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 9
Views: 67

Rydberg Equation

I'm kind of confused about the Rydberg equation v=R[1/n1^2 - 1/n2^2]. When doing problems involving emission spectrums, my TA did 1/nfinal - 1/ninitial, but the n1 and n2 make it seem like you would subtract the final energy level from the initial energy level. Are you just supposed to subtract the ...
by Brianne Conway 1D
Wed Oct 28, 2020 12:20 am
Forum: SI Units, Unit Conversions
Topic: Angstrom
Replies: 6
Views: 66

Re: Angstrom

You're right in that 6.001 x 10^-7 m converts to 6001 angstroms. You shouldn't be multiplying by 10^-10 though since you're not actually converting between different units. They're both in meters, just in different forms of scientific notation, if that makes sense. Basically all you need to do is th...
by Brianne Conway 1D
Wed Oct 28, 2020 12:07 am
Forum: Photoelectric Effect
Topic: Sapling Week 2,3,4 Q 9
Replies: 4
Views: 56

Re: Sapling Week 2,3,4 Q 9

Since the problem asks for the maximum wavelength that will reject electrons, KE=0, so the work function is equal to the energy of the photon. Therefore, you can set 4.810 x 10^-19 J equal to hv. Since we want to find wavelength, you can make v=c/lambda, making the equation 4.810 x 10^-19 J=hc/lamb...
by Brianne Conway 1D
Tue Oct 27, 2020 11:56 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Sapling hw #19
Replies: 4
Views: 95

Re: Sapling hw #19

Like Mohamed said, for questions like this that ask for the minimum uncertainty of something (whether it be position or velocity), you just need to know how to rearrange the ΔxΔp ≥ h/4π equation to solve for what you need. For questions that ask about an electron, a proton, or a neutron, the mass is...
by Brianne Conway 1D
Tue Oct 27, 2020 11:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 4
Views: 29

Re: Electron Configuration

I think on a test it might be considered wrong since Lavelle explicitly stated it is written the second way since it shows that the 3d orbital is lower in energy than the 4s orbital once the 4s orbital is full.
by Brianne Conway 1D
Tue Oct 27, 2020 11:36 pm
Forum: Properties of Light
Topic: rydberg's constant
Replies: 11
Views: 95

Re: rydberg's constant

"The value of the Rydberg constant R∞ is 1.0973731568508 × 10^7 per metre. When used in this form in the mathematical description of series of spectral lines, the result is the number of waves per unit length, or the wave numbers. Multiplication by the speed of light yields the frequencies of t...
by Brianne Conway 1D
Fri Oct 23, 2020 3:48 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin Magnetic Quantum Number
Replies: 6
Views: 45

Re: Spin Magnetic Quantum Number

I don't think we need to know how to actually determine it; I'm pretty sure that has to do with Schrodinger's equation. We just need to know which number signifies which spin.
by Brianne Conway 1D
Fri Oct 23, 2020 3:15 pm
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Numbers
Replies: 6
Views: 36

Re: Magnetic Quantum Numbers

Like Rose said, m sub l ranges from l to -l. That way, there are enough different values of m sub l to signify each configuration for each type of orbital. For example, for an s-orbital (l=o), m sub l can only be 0, signifying the only configuration for the s-orbital. For a p-orbital (l=1), which ha...
by Brianne Conway 1D
Fri Oct 23, 2020 3:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electrons in Orbitals
Replies: 5
Views: 58

Re: Electrons in Orbitals

I don't know why the first electron in an orbital is specifically spin-up, but I'm pretty sure they occupy different orbitals before filling them up because of the repulsion forces between them, so they'd want to be as far away as possible and thus occupy different orbitals.
by Brianne Conway 1D
Fri Oct 23, 2020 3:04 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin States
Replies: 4
Views: 37

Re: Spin States

I'm pretty sure if a problem asked for the quantum numbers of an electron it would tell us whether it was spin-up or spin-down. +1/2 signifies spin-up, while -1/2 signifies spin-down.
by Brianne Conway 1D
Mon Oct 19, 2020 1:43 pm
Forum: Properties of Light
Topic: Photoelectric Experiment
Replies: 3
Views: 10

Re: Photoelectric Experiment

In the photoelectric experiment, they had initially assumed that light acted as a wave, so when electrons were not initially ejected, they expected that increasing the intensity of the light would cause electrons to be ejected since increasing the intensity would increase the energy of the light if ...
by Brianne Conway 1D
Fri Oct 16, 2020 10:33 pm
Forum: *Particle in a Box
Topic: Textbook example 1C.1
Replies: 1
Views: 46

Re: Textbook example 1C.1

If you go up to Figure 1C.4, there is a paragraph above that figure and then an equation above that paragraph. That is Equation 4, the equation they're talking about in step 1. Equation 4 is simply derived from Equation 3, which you'll find if you go up a little more; it's right above the green subt...
by Brianne Conway 1D
Fri Oct 16, 2020 10:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Finding the amount of molecules in compounds using mole conversions
Replies: 3
Views: 45

Re: Finding the amount of molecules in compounds using mole conversions

6.022x10^23 is a constant that can apply to anything, it's just an easier way of describing quantities of atoms or molecules without having to work with big, complicated numbers. Pretty much how kilo- means 1000 of whatever it is you're working with (grams, meters, etc.), a mole is just 6.022x10^23 ...
by Brianne Conway 1D
Fri Oct 16, 2020 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Multiple Choice Format
Replies: 6
Views: 76

Re: Midterm Multiple Choice Format

I might be wrong, but I think I remember my TA saying that partial credit would be available; however, if the midterm actually is going to be multiple choice I'm not sure how that would work. You should ask your TA.
by Brianne Conway 1D
Fri Oct 16, 2020 9:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Webcam application, Zoom Session, and Midterm
Replies: 2
Views: 53

Re: Webcam application, Zoom Session, and Midterm

We're supposed to have our webcam pointing down at our work and have our hands in view at all times. So to do this you can either have an external webcam that you can point down toward your desk while being able to still see your screen (if you're using a laptop). Or, you can use a separate monitor ...
by Brianne Conway 1D
Fri Oct 16, 2020 9:13 pm
Forum: Einstein Equation
Topic: Lecture Example 10/16/20
Replies: 4
Views: 46

Re: Lecture Example 10/16/20

If you're talking about how he switched the -4.09x10^(-19) to 4.09x10^19 I'm pretty sure it's because the negative represents the energy the electron lost, meaning that the electron would release a photon with that amount of energy (a positive value) because of the law of conservation of energy. So ...
by Brianne Conway 1D
Wed Oct 07, 2020 4:22 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: precision for molar masses
Replies: 14
Views: 112

Re: precision for molar masses

I always wait to round till the very end and make sure I'm using correct significant figures for my end answer. Dr. Lavelle may have another method but this is what I was taught in high school. Regarding different numbers on the periodic table, I'd use the periodic table in the book considering it ...
by Brianne Conway 1D
Wed Oct 07, 2020 4:18 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding EF to Integers
Replies: 6
Views: 62

Re: Rounding EF to Integers

As everyone else said, I think it would be easier to just convert it to integers, but if you like to leave it with decimals you probably can as long as the question doesn't actually ask for the empirical formula.
by Brianne Conway 1D
Wed Oct 07, 2020 4:13 pm
Forum: Significant Figures
Topic: Clarification on Significant Figures
Replies: 9
Views: 67

Re: Clarification on Significant Figures

I could possibly be wrong here, but I think that leading zeros are the zeros that do not count. For instance, 0.034 would have only 2 sig figs, whereas 0.304 would have 3 sig figs since the zero second zero is in the middle and not leading. However, I am a bit rusty on sig fig rules, so feel free t...
by Brianne Conway 1D
Wed Oct 07, 2020 4:06 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants
Replies: 9
Views: 55

Re: Limiting Reactants

I'm pretty sure there can only be one limiting reactant because either one reactant will limit the other(s) or the reactants will all be present in proportionate amounts according to the chemical equation in which case they would not limit each other. The only case I can think of where there might b...
by Brianne Conway 1D
Wed Oct 07, 2020 3:52 pm
Forum: Significant Figures
Topic: Tips for counting sig figs?
Replies: 9
Views: 86

Re: Tips for counting sig figs?

I think it's easiest to summarize the sig fig rules into 3 simple steps that determines whether the number is significant or not: 1. If the number is nonzero (3, 6, 8, etc.), then it is a significant figure . 2. If the number zero is in between two non zero numbers (606, 802, etc.), then it is a si...

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