Search found 76 matches

by Robin Cadd 1D
Mon Jan 20, 2020 4:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K value at a specific temp
Replies: 6
Views: 26

Re: Activity

AKatukota wrote:What should we know about the activity of a reaction?

We talk about activities when we talk about K. When we use partial pressures and concentrations to calculate K, we're actually using approximations. In reality, K is calculated by using activities.
by Robin Cadd 1D
Mon Jan 20, 2020 3:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6B 9
Replies: 3
Views: 17

Re: 6B 9

Although rare, what you have described is entirely possible. I think they're called superbases or superacids.
by Robin Cadd 1D
Mon Jan 20, 2020 3:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Van’t Hoff Equation
Replies: 4
Views: 19

Re: Van’t Hoff Equation

We will not cover the Van't Hoff Equation for this section of the course, and we're not expected to know it for any exams. Beyond it being useful to solve problems involving ICE boxes and chemical equilibrium, I'm not entirely sure what it's used for either. It relates changes in temperature to chan...
by Robin Cadd 1D
Mon Jan 20, 2020 3:48 pm
Forum: Ideal Gases
Topic: R constant for PV=nRT
Replies: 7
Views: 22

Re: R constant for PV=nRT

Look at the units of pressure to differentiate between the R constants. Whichever R constant contains the same units of pressure as the data you have is the one you should choose to make further calculations.
by Robin Cadd 1D
Mon Jan 20, 2020 3:45 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kc vs K
Replies: 7
Views: 13

Re: Kc vs K

K refers to the equilibrium constant. Kc is the equilibrium constant calculated by using concentrations. Basically, Kc is a subset of K.
by Robin Cadd 1D
Tue Jan 14, 2020 9:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constants table
Replies: 4
Views: 18

Re: Equilibrium constants table

In addition to what everyone else has mentioned, make sure the temperatures you are comparing to those listed in the equilibrium constant table are in Kelvin.
by Robin Cadd 1D
Tue Jan 14, 2020 8:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K cutoff
Replies: 5
Views: 20

Re: K cutoff

If K is smaller than 10^-4, you can use the shortcut.
by Robin Cadd 1D
Tue Jan 14, 2020 8:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 8
Views: 28

Re: Autoprotolysis

ELu 1J wrote:It occurs naturally and emphasizes the amphoteric nature of water (the ability to both give and accept a proton).

One important point to add: autoprotolysis can occur between molecules other than water.
by Robin Cadd 1D
Tue Jan 14, 2020 8:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases
Replies: 6
Views: 28

Re: Acids and Bases

If I understand your question correctly, the answer is no. Like any other chemical reaction, there will be times when a given acid-base reaction is at equilibrium and times when the reaction is not at equilibrium.
by Robin Cadd 1D
Tue Jan 14, 2020 8:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Lyndon Bui Workshops
Replies: 3
Views: 45

Re: Lyndon Bui Workshops

Lyndon doesn’t post his worksheets. Your best bet is to get photos of them from a friend or fellow classmate.
by Robin Cadd 1D
Tue Jan 14, 2020 8:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 8
Views: 38

Re: ICE Table

Yes. In sum, you can use partial pressures, moles, or concentrations in your ICE box.
by Robin Cadd 1D
Tue Jan 14, 2020 8:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium concentration with gases
Replies: 7
Views: 31

Re: equilibrium concentration with gases

Yes, because what you’re given corresponds to solving for Kc.
by Robin Cadd 1D
Tue Jan 07, 2020 11:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Very Large K
Replies: 12
Views: 64

Re: Very Large K

In addition to what everyone else has already mentioned, it means that the products are much more stable than the reactants in the chemical equation provided.
by Robin Cadd 1D
Tue Jan 07, 2020 11:10 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units in Bars
Replies: 4
Views: 33

Re: Units in Bars

Bars are pressure units. For the purposes of this class, we assume 1 bar = 1 atm. This is an approximation.
by Robin Cadd 1D
Tue Jan 07, 2020 11:08 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Heterogenous vs. Homogenous equations
Replies: 6
Views: 31

Re: Heterogenous vs. Homogenous equations

A homogenous equation includes substances where all of the phases are the same, for example all gases, and a heterogenous equation has a mixture of different phases. Here's a couple of examples that I think illustrate this well: homogeneous: N2 (g) +3 H2 (g) -> 2 NH3 (g) heterogeneous: CaCO3 (s) ->...
by Robin Cadd 1D
Tue Jan 07, 2020 11:02 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc versus K
Replies: 4
Views: 31

Kc versus K

Could someone please explain the difference between Kc and K to me? I read about it in the textbook but I'm still a bit confused. Thanks!
by Robin Cadd 1D
Tue Jan 07, 2020 8:27 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using the "ICE" box
Replies: 8
Views: 55

Using the "ICE" box

Do we include data concerning solids and liquids in our "ICE" box calculations? I know such data is excluded from calculations of the equilibrium constant, so is it also omitted from our "ICE" box calculations?
by Robin Cadd 1D
Mon Dec 02, 2019 9:06 am
Forum: Bronsted Acids & Bases
Topic: For J. 9., when do we separate H+ from the acid?
Replies: 2
Views: 41

Re: For J. 9., when do we separate H+ from the acid?

I don't have the textbook on me at the moment, but I'd assume it probably has something to do with the strength of the acid.
by Robin Cadd 1D
Mon Dec 02, 2019 9:01 am
Forum: Calculating the pH of Salt Solutions
Topic: konstant?
Replies: 5
Views: 204

Re: konstant?

Eesha Sohail 1J wrote:Will we have to deal with any questions about Q vs K and le Chatelier's principle on the final?


No - I believe Dr. Lavelle said we would not be doing any calculations with the equilibrium equation.
by Robin Cadd 1D
Mon Dec 02, 2019 8:59 am
Forum: Amphoteric Compounds
Topic: Identifying Amphoteric Compounds
Replies: 5
Views: 28

Re: Identifying Amphoteric Compounds

If the compound can act as both an acid and a base, the compound is amphoteric. The most common example is H2O. It can gain a proton to become a hydronium ion (H3O+) or lose a proton to become a hydroxide ion (OH-).
by Robin Cadd 1D
Mon Dec 02, 2019 8:54 am
Forum: Naming
Topic: Oxidation States
Replies: 3
Views: 24

Re: Oxidation States

Here's a video that will give you the basics on how to determine oxidation states/numbers. Hope this helps!
https://youtu.be/-a2ckxhfDjQ
by Robin Cadd 1D
Mon Dec 02, 2019 8:52 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Weak acids & pH
Replies: 4
Views: 49

Re: Weak acids & pH

Depending on the solvent, the amount of dissociation will differ. Since pH depends on the concentration of H+ in a solution, the identity of the solvent will play an important role in the pH.
by Robin Cadd 1D
Mon Nov 25, 2019 11:59 am
Forum: Naming
Topic: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
Replies: 11
Views: 57

Re: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-

Megan_1F wrote:What is the order of naming coordination compounds?

1) ligands first, then metal ion or atom
2) ligands are named in alphabetical order, disregarding their prefixes
by Robin Cadd 1D
Mon Nov 25, 2019 11:56 am
Forum: Naming
Topic: 9C #9c/d
Replies: 3
Views: 20

Re: 9C #9c/d

Those are abbreviations for ligands. Their chemical formulas can be found in the textbook.
by Robin Cadd 1D
Mon Nov 25, 2019 11:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polarity
Replies: 10
Views: 68

Re: Determining Polarity

This isn't comprehensive, but may help you:
- tetrahedral, trigonal planar, octahedral: non-polar if all atoms surrounding central atom are the same; polar if different atoms surround the central atom
by Robin Cadd 1D
Mon Nov 25, 2019 11:42 am
Forum: Naming
Topic: 9C #5
Replies: 3
Views: 40

Re: 9C #5

A polydentate ligand is a ligand that can attach to multiple bonding sites. They're asking which of the ligands can attach to multiple bonding sites.
by Robin Cadd 1D
Mon Nov 25, 2019 11:36 am
Forum: Naming
Topic: Roman numerals
Replies: 6
Views: 31

Re: Roman numerals

When it is common for an element to have more than one possible charge (i.e. it's common that Fe has either a charge of 2+ or 3+), Roman numerals are used. These Roman numerals help to identify the compound.
by Robin Cadd 1D
Mon Nov 25, 2019 11:28 am
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 131

Re: Week 9 and Week 10 HW?

Angeline 3E wrote:
alex_4C wrote:Does that mean that our discussions are cancelled this week?


Discussions aren't canceled for the week.
by Robin Cadd 1D
Mon Nov 18, 2019 10:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining polarity 2E 25 pt d
Replies: 3
Views: 20

Re: Determining polarity 2E 25 pt d

As others have said, the answer to your first question is yes. A molecule is non-polar when the dipole moments of the molecule cancel out. A molecule is polar when the dipole moments of that molecule do not cancel out.
by Robin Cadd 1D
Mon Nov 18, 2019 9:57 am
Forum: General Science Questions
Topic: Chem BL
Replies: 7
Views: 57

Re: Chem BL

Based on previous threads I've seen on Chemistry Community, people generally advise to take Chem 14B before taking Chem 14BL. There's no rule, but it may make your workload and studying a bit easier to manage!
by Robin Cadd 1D
Mon Nov 18, 2019 9:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE notation
Replies: 10
Views: 47

Re: AXE notation

It is a way of expressing the number of lone pairs and bonding pairs surrounding the central atom of a molecule.
by Robin Cadd 1D
Mon Nov 18, 2019 9:23 am
Forum: Student Social/Study Group
Topic: Test 2
Replies: 5
Views: 38

Re: Test 2

In Friday's lecture Lavelle said that only the first slide's material on Monday would be tested on the exam. Anything after that point would not be.
by Robin Cadd 1D
Mon Nov 18, 2019 9:21 am
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pair shape
Replies: 3
Views: 27

Re: lone pair shape

One lone pair is first placed in one of the three equatorial positions surrounding an atom in a trigonal bipyramidal electron arrangement because the lone pair will cause the least repulsion there. If placed in an axial position, the lone pair will repel the three equatorial atoms strongly, as oppos...
by Robin Cadd 1D
Mon Nov 11, 2019 8:56 pm
Forum: Ionic & Covalent Bonds
Topic: Exam 2 & Homework
Replies: 5
Views: 43

Re: Exam 2 & Homework

I'm pretty sure it's okay to turn in homework relating to chemical bonds.
by Robin Cadd 1D
Mon Nov 11, 2019 8:54 pm
Forum: Ionic & Covalent Bonds
Topic: Homework for week 7
Replies: 5
Views: 39

Re: Homework for week 7

I think you should be fine if you submit homework on chemical bonds.
by Robin Cadd 1D
Mon Nov 11, 2019 8:53 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Test 2
Replies: 6
Views: 59

Re: Test 2

I assume it will be everything covered on the midterm + whatever additional material is covered before the date of the test.
by Robin Cadd 1D
Mon Nov 11, 2019 8:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Induced dipole-induced dipole interactions
Replies: 2
Views: 13

Re: Induced dipole-induced dipole interactions

In short, as polarizability increases, induced dipole-induced dipole interactions grow stronger. Polarizability can be described as how much an electron cloud can be distorted; therefore, greater electron cloud distortion should correlate with stronger dipole interactions.
by Robin Cadd 1D
Mon Nov 04, 2019 10:04 am
Forum: Resonance Structures
Topic: Unequal Contribution
Replies: 3
Views: 54

Re: Unequal Contribution

Are you referring to unequal electron contribution? I'm pretty sure they're drawn like any other resonance structure.
by Robin Cadd 1D
Mon Nov 04, 2019 9:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: aufbau principle
Replies: 4
Views: 47

Re: aufbau principle

Anything past the 3d block we don't need to know.
by Robin Cadd 1D
Mon Nov 04, 2019 9:56 am
Forum: Properties of Light
Topic: Finding Frequency
Replies: 3
Views: 55

Re: Finding Frequency

Use de Broglie's Equation.
by Robin Cadd 1D
Mon Nov 04, 2019 9:39 am
Forum: Octet Exceptions
Topic: elements in 3p block
Replies: 8
Views: 95

Re: elements in 3p block

They do have a 3d subshell, it's just not filled.
by Robin Cadd 1D
Mon Nov 04, 2019 9:37 am
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 11
Views: 104

Re: octet exceptions

The only elements that hold stead-fast to the octet rule are C, N, O, F, and Ne. Hydrogen and helium will always have less than an octet (precisely, 2 electrons) because of the number of electrons their orbitals are able to accommodate. As a general rule, elements in the p-block with shell n=3 or gr...
by Robin Cadd 1D
Mon Oct 28, 2019 8:53 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 2
Views: 38

Re: Midterm

I'm not 100% sure, but if I remember correctly, I think my TA said that it would be both multiple choice and free response.
by Robin Cadd 1D
Mon Oct 28, 2019 7:59 am
Forum: Octet Exceptions
Topic: expanded octet?
Replies: 9
Views: 68

Re: expanded octet?

Also, an important conceptual point to add: the possibility of an expanded octet continues for the atoms below Cl, P, and S within the p-block.
by Robin Cadd 1D
Mon Oct 28, 2019 7:54 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: HW question 1B.25
Replies: 3
Views: 49

Re: HW question 1B.25

A good starting point is to recognize that the diameter of 350 pm is your delta x in Heisenburg's indeterminacy equation.
by Robin Cadd 1D
Mon Oct 28, 2019 7:51 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge equation?
Replies: 5
Views: 42

Re: Formal Charge equation?

I think your TA just used the textbook's equations. B stands for the number of bonding electrons on the atom.
by Robin Cadd 1D
Mon Oct 28, 2019 7:47 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 5
Views: 65

Re: Midterm

I'm pretty sure bonding will also be on the midterm.
by Robin Cadd 1D
Mon Oct 21, 2019 10:14 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Short Hand or Normal Way?
Replies: 3
Views: 35

Re: Short Hand or Normal Way?

Considering that Lavelle tends to write noble gas electron configurations and that the solutions manual of the textbook writes solutions with noble gas configurations, I think shorthand notation should be fine. Like others have said, I'm sure he will specify which type of electron configuration he w...
by Robin Cadd 1D
Mon Oct 21, 2019 10:06 am
Forum: Properties of Electrons
Topic: QM Description of Atoms - Electron standing wave
Replies: 2
Views: 37

Re: QM Description of Atoms - Electron standing wave

The concept of a "standing wave" addresses the wave-like properties of an electron. Basically, it's just saying that an electron behaves somewhat like a wave. This property of an electron affects the electron's movement within an atom.
by Robin Cadd 1D
Mon Oct 21, 2019 10:02 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Spin
Replies: 5
Views: 48

Re: Electron Spin

There are only two electron spins, denoted as +1/2 or -1/2 (qualitatively, "spin up" or "spin down"). I don't believe you'll ever see atoms that have multiple electron spins, unless you're talking about "spin up" or "spin down". I hope this answers your questi...
by Robin Cadd 1D
Mon Oct 21, 2019 9:23 am
Forum: Properties of Light
Topic: Chemistry Community Posts
Replies: 10
Views: 113

Re: Chemistry Community Posts

We're supposed to post five times a week by Sunday. I don't believe your posts roll over.
by Robin Cadd 1D
Mon Oct 21, 2019 9:14 am
Forum: Properties of Light
Topic: Chemistry Community Posts
Replies: 10
Views: 113

Re: Chemistry Community Posts

We're supposed to post five times a week by Sunday. I don't believe your posts roll over.
by Robin Cadd 1D
Mon Oct 21, 2019 9:08 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions in Electron Configurations
Replies: 5
Views: 38

Re: Exceptions in Electron Configurations

The only reason why these configurations do not follow the original rules is that if they did, the energy would not be distributed symmetrically. The d subshell has 5 orbitals that hold 2 electrons each. It helps to think about it visually. Draw out the 5 orbitals for the d shell and fill it in and...
by Robin Cadd 1D
Mon Oct 14, 2019 11:14 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition??
Replies: 3
Views: 29

Re: Bohr Frequency Condition??

It could be used in either of the situations that you described. I don't have a definitive answer for your last question, but I'd assume we should know how to answer problems pertaining to both situations.
by Robin Cadd 1D
Mon Oct 14, 2019 11:02 am
Forum: Properties of Electrons
Topic: Two Kinds of Properties
Replies: 3
Views: 35

Re: Two Kinds of Properties

It means that light can behave like a wave, or light can behave like a particle. Depending upon the situation, one of these behaviors may emerge more prominently than the other. This is illustrated by Justin's experimental examples.
by Robin Cadd 1D
Mon Oct 14, 2019 10:51 am
Forum: Properties of Light
Topic: MidTerms and Finals
Replies: 11
Views: 85

Re: MidTerms and Finals

I'm almost certain finals will not occur where our discussion happens, but the study list says the official location of the final is TBD.
by Robin Cadd 1D
Mon Oct 14, 2019 10:48 am
Forum: Administrative Questions and Class Announcements
Topic: Where are the problems for Quantum World?
Replies: 2
Views: 19

Re: Where are the problems for Quantum World?

I'm not sure if it's because you're using the sixth edition, but the problems should just be at the end of the reading section for 1A. If it helps, the problems for section 1A mainly cover atomic spectra and electromagnetic radiation.
by Robin Cadd 1D
Wed Oct 09, 2019 11:45 am
Forum: Photoelectric Effect
Topic: Quantum
Replies: 5
Views: 59

Re: Quantum

The following link may be helpful in answering your question: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=2ahUKEwjm9fDx6Y_lAhVTMH0KHZZnA5YQFjACegQIDRAG&url=http%3A%2F%2Fonlinestatbook.com%2Fglossary%2Fdiscrete_variables.html&...
by Robin Cadd 1D
Wed Oct 09, 2019 11:34 am
Forum: Limiting Reactant Calculations
Topic: M.9 hw prob
Replies: 4
Views: 55

Re: M.9 hw prob

The net ionic equation would look like this: Cu+2 + 2OH- = Cu(OH)2 I hope this helps Just a bit of clarification that I thought might be useful - the OH comes from NaOH; the Cu2+ comes from the copper (II) nitrate. Therefore, if you have 2 moles of OH- in your net ionic equation, you will have 2 mo...
by Robin Cadd 1D
Wed Oct 09, 2019 11:22 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: sig figs
Replies: 20
Views: 155

Re: sig figs

Adding/Subtracting --> round to the least precise # (i.e. 4.23+4.542 = ? ; Your answer should have 2 decimal points)
v.
Mutiplying/Dividing --> # of sig figs in answer = least # of sig figs in whatever you're multiplying (i.e. 4.0*2 =8)
by Robin Cadd 1D
Wed Oct 09, 2019 11:15 am
Forum: Significant Figures
Topic: Are we allowed to round when showing work?
Replies: 7
Views: 51

Re: Are we allowed to round when showing work?

Yes, that's fine.
by Robin Cadd 1D
Tue Oct 08, 2019 6:11 pm
Forum: SI Units, Unit Conversions
Topic: Test #1-Bruincard
Replies: 4
Views: 76

Test #1-Bruincard

Do we need our Bruincard to be able to take the test this week?
by Robin Cadd 1D
Mon Oct 07, 2019 9:48 pm
Forum: Significant Figures
Topic: Significant Figures and Molar Masses
Replies: 5
Views: 79

Significant Figures and Molar Masses

Do molar masses contribute to your calculation of significant digits? For instance, if part of your calculation(i.e. grams of C) has 3 significant figures, and the molar mass has 2 significant figures, and I use both to come up with my answer, should my answer have 2 significant figures?
by Robin Cadd 1D
Thu Oct 03, 2019 4:16 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reagent Ratios
Replies: 4
Views: 54

Re: Limiting Reagent Ratios

If given information on two reactants, you can also compare how much product each reactant will form if completely used up. The reactant that theoretically produces a lesser amount of product will be your limiting reactant. Hope this helps!
by Robin Cadd 1D
Thu Oct 03, 2019 4:08 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 6
Views: 83

Re: Sig Figs

In addition to what has already been mentioned, it may be helpful to consider the following points:
1) Does the zero act as a place holder? If it does, it's not going to be a significant digit.
2) Is the zero between two significant figures? If it is, it the zero will be a significant digit.
by Robin Cadd 1D
Thu Oct 03, 2019 4:03 pm
Forum: Empirical & Molecular Formulas
Topic: Tips for Finding Which Number to Multiply a Decimal By to Get a Whole Number
Replies: 10
Views: 114

Re: Tips for Finding Which Number to Multiply a Decimal By to Get a Whole Number

I don't know if this method is faster per se, but I find it helpful to visualize the decimal in its fraction form when trying to determine what number to multiply by.
by Robin Cadd 1D
Thu Oct 03, 2019 3:59 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E: Moles and Molar Mass Question #23
Replies: 2
Views: 62

Re: Fundamentals E: Moles and Molar Mass Question #23

What are the steps in solving question E.23 from Fundamentals E: Moles and Molar Mass? Example: Calculate the amount (in moles) of: (a) Cu2+ ions in 3.00 g of CuBr2 (b) SO3 Molecules in 7.00 x 10^2 mg of SO3 (c) F^-1 ions in 25.2 kg of UF6 (d) H20 in 2.00 g of (Na2CO3)(10H20) The steps for solving ...
by Robin Cadd 1D
Thu Oct 03, 2019 3:44 pm
Forum: SI Units, Unit Conversions
Topic: Slide Show Notes
Replies: 5
Views: 104

Re: Slide Show Notes

No, he does not post his lecture slides.
by Robin Cadd 1D
Sat Sep 28, 2019 11:23 pm
Forum: Significant Figures
Topic: How does Significant Figures work? [ENDORSED]
Replies: 12
Views: 135

Re: How does Significant Figures work? [ENDORSED]

Claire Lo 3C wrote:In inter-problem calculations, how many sig figs do u keep? Same as the question or one more?

As a general rule of thumb, I think you’d keep the same amount of sig figs as the question.
by Robin Cadd 1D
Sat Sep 28, 2019 11:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 2964

Re: Advice from a Medical Student - Part II [ENDORSED]

As someone aspiring to follow a career pathway similar to your own, I thoroughly enjoyed reading your post. Good luck in your future endeavors!
by Robin Cadd 1D
Sat Sep 28, 2019 11:12 pm
Forum: Significant Figures
Topic: Sig Figs on Molar Masses
Replies: 4
Views: 74

Re: Sig Figs on Molar Masses

In regards to your second question, you may want to check Lavelle’s Chem 14A page. On the class website, he has a list of errors found in the solutions manual.
by Robin Cadd 1D
Sat Sep 28, 2019 7:22 pm
Forum: Empirical & Molecular Formulas
Topic: HW Problem F15
Replies: 2
Views: 48

HW Problem F15

For reference, this is the textbook question: Diazepam has the mass percentage composition 67.94% C, 12.49% Cl, 9.84% N, and 5.62% O. What is the empirical formula of the compound? My question isn't specific to only problem F15 but can be applied to practically the entire section. I understand how t...
by Robin Cadd 1D
Fri Sep 27, 2019 6:47 pm
Forum: Significant Figures
Topic: How does Significant Figures work? [ENDORSED]
Replies: 12
Views: 135

Re: How does Significant Figures work? [ENDORSED]

When you multiply or divide, the number with the fewest significant figures tells you how many significant figures your answer should have. In the example you provided, 1.25 has 3 significant figures and 3.1 has 2 significant figures. 2<3, so your answer should have 2 significant figures. Hope this ...
by Robin Cadd 1D
Fri Sep 27, 2019 6:04 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 393

Re: Ionic vs Covalent

Generally speaking, ionic bonds are stronger than covalent bonds.

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