## Search found 103 matches

Thu Mar 12, 2020 7:10 pm
Forum: Student Social/Study Group
Replies: 44
Views: 2060

Is it possible to get a lower letter grade after the curve? For example, if I have a 450/500 (90%), is it possible that I'll get a B+ because the class average is too high?
Tue Mar 10, 2020 6:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka Kb
Replies: 11
Views: 146

### Re: Ka Kb

Usually, you would need Ka or Kb when the question gives you a concentration of a weak acid/base and asks for the pH or pOH of the solution.
Tue Mar 10, 2020 6:39 pm
Forum: General Rate Laws
Topic: orders
Replies: 6
Views: 90

### Re: orders

You first have to determine the orders of the individual reactants by comparing the reaction rate and concentration. For the reaction order, you would add the orders of the reactants together. For 17, it would be 1 (A) + 2 (B) + 2 (C) = 5.
Tue Mar 10, 2020 6:35 pm
Forum: Student Social/Study Group
Topic: Midterm Question 3
Replies: 1
Views: 110

### Midterm Question 3

Where would we find in the textbook how to do problems like 3B,C, and D? I don't think I ever came across it while doing Outline 2.
Tue Mar 10, 2020 6:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D.15 part b
Replies: 2
Views: 47

### Re: 6D.15 part b

Prasanna Padmanabham 4I wrote:What edition textbook are you using? Part b on 6D.15 for me is asking about AlCl3...

Yeah it's the same question. I'm just referring to it without the Cl ions since they're not part of the equation. The answer manual uses Al(H2O)6 as the acid to calculate concentration/pH.
Tue Mar 10, 2020 4:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D.15 part b
Replies: 2
Views: 47

### 6D.15 part b

How do you get the Ka for Al(H2O)6? I don't think it's on either table 6C.1 or 2.
Mon Mar 09, 2020 10:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: exothermic reaction
Replies: 4
Views: 76

### Re: exothermic reaction

In an exothermic reaction, heat is one of the products. For an endothermic reaction, heat is required, so it can be seen as part of the reactants.
Thu Mar 05, 2020 9:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.11
Replies: 4
Views: 102

### 6M.11

When writing the cell diagram, how do you know which phase to write?
Thu Mar 05, 2020 4:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.9
Replies: 2
Views: 49

### 6L.9

How do you get the two half reactions for the solution? Where does K and Cl go?
Thu Mar 05, 2020 4:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram Order
Replies: 8
Views: 92

### Cell Diagram Order

Does order matter when drawing cell diagrams? For example: Au(s)|Au3+(aq)|| or Au3+(aq)|Au(s)||
Thu Mar 05, 2020 3:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.3 part d
Replies: 1
Views: 63

### 6L.3 part d

How do you get the half reaction for the anode? Shouldn't O2 and H+ be on different sides of the equation?
Thu Mar 05, 2020 3:46 pm
Forum: Balancing Redox Reactions
Topic: 6K.5 part d
Replies: 3
Views: 69

### 6K.5 part d

How are you supposed to balance out P4 -> PH3?
Thu Mar 05, 2020 3:17 pm
Forum: Balancing Redox Reactions
Topic: 6K.5 part a
Replies: 1
Views: 52

### 6K.5 part a

How are we supposed to balance out H2O? Can someone walk me through the steps/reasoning?
Thu Mar 05, 2020 12:39 am
Forum: Van't Hoff Equation
Topic: Van't Hoff equation
Replies: 10
Views: 227

### Re: Van't Hoff equation

I heard from my TA that you need to know how to derive it for the final. She said points could be given based on deriving it.
Wed Mar 04, 2020 7:33 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 4
Views: 68

### Cell Diagram

When do you use a comma and when do you use | in a cell diagram?
Wed Mar 04, 2020 2:51 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 3
Views: 74

### Cell Diagram

How do you know when to add Pt to the cell diagram?
Wed Mar 04, 2020 2:15 am
Forum: Balancing Redox Reactions
Topic: 6K.3 part d
Replies: 1
Views: 33

### 6K.3 part d

Why is the half equation Cl2 +2e- -> 2Cl- when in the equation, it's Cl2 -> Cl2?
Wed Mar 04, 2020 1:38 am
Forum: Balancing Redox Reactions
Topic: Oxidation Number
Replies: 2
Views: 51

### Oxidation Number

Can someone give a general outline of how to find oxidation number?
Wed Mar 04, 2020 12:36 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.17
Replies: 1
Views: 42

### 5G.17

Why is I labeled as the reactant instead of I2? Isn't it supposed to be the opposite?
Wed Mar 04, 2020 12:29 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free and Direction of Reaction
Replies: 3
Views: 50

### Gibbs Free and Direction of Reaction

If Gibbs is positive and spontaneous, why does it mean that it will produce more reactants?
Tue Mar 03, 2020 8:04 pm
Forum: General Science Questions
Topic: Test 2
Replies: 12
Views: 285

### Re: Test 2

Would there be any conceptual ideas that we should know before the test?
Sun Feb 16, 2020 9:48 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated versus closed
Replies: 7
Views: 162

### Re: Isolated versus closed

Isolated systems cannot exchange matter or energy. But a closed system can exchange energy.
Sun Feb 16, 2020 9:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: endo/exo and temp
Replies: 12
Views: 437

### Re: endo/exo and temp

Exothermic reactions produce heat. When the temperature is raised, there is more heat (product) so the system shifts to the reactants to maintain the equilibrium.
Sun Feb 16, 2020 9:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: S = 0
Replies: 18
Views: 270

### Re: S = 0

S, or entropy, is zero in an isothermal reversible system since it it always at equilibrium.
Sun Feb 16, 2020 9:45 pm
Forum: Administrative Questions and Class Announcements
Topic: HW7
Replies: 14
Views: 129

### Re: HW7

My TA mentioned that she would accept homework problems we did on midterm topics.
Sun Feb 16, 2020 9:44 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isochoric
Replies: 8
Views: 148

### Re: Isochoric

Isochoric means a constant volume.
Sun Feb 16, 2020 9:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 11
Views: 139

### Re: Test 2

Similar to what is was last quarter, I don't think test 2 is cumulative. It should cover the topics we learn after the midterm.
Sun Feb 16, 2020 9:43 pm
Forum: General Science Questions
Topic: Studying
Replies: 19
Views: 255

### Re: Studying

For me, the workshops are really helpful since they give you extra problems to work on. If you have questions, I suggest going to the TA office hours or the step-ups/ drop-ins.
Wed Feb 12, 2020 3:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4D.23
Replies: 2
Views: 62

### 4D.23

Why do you need to subtract twice the enthalpy of formation of NO to get the total reaction enthalpy?
Wed Feb 12, 2020 3:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Question 4J.7
Replies: 5
Views: 89

### Re: Question 4J.7

Jordan Young 2J wrote:Enthalpy of formation of O2 is zero because it's in its most stable form of oxygen

How would you know that it's the most stable form? Would you have to memorize it?
Tue Feb 11, 2020 8:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Question 4J.7
Replies: 5
Views: 89

### Question 4J.7

When calculating the enthalpy, why are only some reactants/products used to calculate it? For example, for part (a), you only use the enthalpy of formation of H2O and H2O2, and don't include O2.
Tue Feb 11, 2020 7:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa and pKb
Replies: 4
Views: 68

### Re: pKa and pKb

The equation is pKa = -log Ka. Due to the math, a larger Ka will mean a smaller pKa.
Wed Jan 29, 2020 11:39 am
Forum: Phase Changes & Related Calculations
Topic: Phase change and temp
Replies: 8
Views: 86

### Re: Phase change and temp

Energy is used for the phase change, so there is no increase/decrease in temperature.
Wed Jan 29, 2020 11:37 am
Forum: Ideal Gases
Topic: non ideal gases
Replies: 8
Views: 88

### Re: non ideal gases

Most gases are non ideal. Any gas that has intermolecular forces and take up volume are non ideal.
Wed Jan 29, 2020 11:37 am
Forum: Ideal Gases
Topic: Inert Gas
Replies: 12
Views: 164

### Re: Inert Gas

An inert gas does not react. Noble gases are the elements of the rightmost column of the periodic table. Noble gases are part of inert gases, but they are not used interchangeably.
Wed Jan 29, 2020 11:35 am
Forum: Ideal Gases
Topic: ideal gases
Replies: 13
Views: 285

### Re: ideal gases

Ideal gases must follow the gas laws. They have no interaction and take up no volume.
Wed Jan 29, 2020 11:19 am
Forum: Ideal Gases
Topic: density
Replies: 5
Views: 168

### Re: density

Since density is mass over volume, you can substitute the mass in n and the volume in v in the equation pv = nrt. Once this is done, the equation can be rewritten as molar mass = dRT/P.
Wed Jan 29, 2020 11:16 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Volume and Pressure
Replies: 8
Views: 101

### Re: Volume and Pressure

Volume and pressure have an inverse relationship. If the volume decreases, the air particles crash more frequently within the smaller area, increasing pressure. The opposite occurs when volume increases.
Wed Jan 29, 2020 11:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants
Replies: 2
Views: 34

### Re: Equilibrium Constants

It is also important to note that ka * kb = kw, which is equal to 1.0*10^-14.
Wed Jan 29, 2020 11:13 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 6
Views: 91

### Re: Temperature

Heat is part of the products in an exothermic reaction. If the temperature is raised, there is more heat and the reaction is driven back to maintain equilibrium.
Wed Jan 29, 2020 11:12 am
Forum: Lewis Acids & Bases
Topic: Lewis acid and bases
Replies: 5
Views: 121

### Re: Lewis acid and bases

Lewis acids accept an electron pair while lewis bases donate an electron pair. If a molecule has unbonded electron pairs, it can be a lewis base by donating an electron. If a molecule's valence shells are not filled, it can accept an electron and act as a lewis acid.
Thu Jan 23, 2020 10:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.35
Replies: 1
Views: 37

### 5.35

In problem 5.35, how would you figure out the balanced chemical equation just from the partial pressures?
Fri Jan 17, 2020 6:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong or weak acid?
Replies: 5
Views: 52

### Re: Strong or weak acid?

I think memorizing the strong acids and bases will help since there aren't many of them to begin with. Just assume everything else is weak.
Fri Jan 17, 2020 6:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Product Yield
Replies: 6
Views: 57

### Re: Product Yield

If the product is removed, the reaction will immediately favor the forward reaction, producing more product.
Fri Jan 17, 2020 6:22 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH for weak acids
Replies: 5
Views: 235

### Re: pH for weak acids

Lower pH means a higher acidity and more H+ in the solutions. Stronger acids have a higher acidity and they also dissociate completely, meaning more H+.
Fri Jan 17, 2020 6:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Change
Replies: 9
Views: 181

### Re: Temperature Change

Since the reaction is endothermic, when the temperature is raised the reaction favors the products since it shifts to the right due to the reaction using up the heat to produce more products.
Fri Jan 17, 2020 4:46 pm
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 180

### Re: Test 1[ENDORSED]

Test 1 starts in discussion sections next week. It will cover the first two units: chemical equilibrium and acids and bases.
Sun Jan 12, 2020 2:21 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different K's
Replies: 5
Views: 81

### Re: Different K's

The c in Kc stands for concentration while the p in Kp stands for pressure. It just depends on which you are using to determine the K.
Sun Jan 12, 2020 2:20 am
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 160

### Re: PV = nRT

P is pressure, v is volume, n is the number of moles, R is the Ideal Gas Constant (8.314 J / mol·K), and T is the temperature in K.
Sun Jan 12, 2020 2:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Significant Figures
Replies: 8
Views: 93

### Re: Significant Figures

You would have to take into consideration all the numbers you used in the calculation of the k value. Just use the numbers given to you in the question to determine your sig figs.
Sun Jan 12, 2020 2:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Changes in pressure
Replies: 3
Views: 44

### Re: Changes in pressure

Volume has a direct relationship with pressure, so if one increased, the other would also increase and vise versa.
Sun Jan 12, 2020 2:16 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial pressure
Replies: 4
Views: 44

### Re: Partial pressure

In a mixture of gas, each gas is responsible for a partial pressure. In comparison, the total pressure is just the sum of these partial pressures.
Sun Dec 08, 2019 8:46 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate
Replies: 4
Views: 158

### Re: polydentate

Is a molecule polydentate as long as it has a lone pair to bind?
Sun Dec 08, 2019 8:45 am
Forum: Biological Examples
Topic: Hemoglobin and Myoglobin
Replies: 4
Views: 175

### Hemoglobin and Myoglobin

What do we need to know about Hemoglobin and Myoglobin? How would they be tested?
Sun Dec 08, 2019 2:41 am
Forum: Lewis Acids & Bases
Topic: Lewis Structure
Replies: 2
Views: 89

### Lewis Structure

How can you tell if a compound is a lewis acid or base by looking at their lewis structure?
Sun Dec 08, 2019 2:39 am
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 7
Views: 201

### Re: Lewis vs Bronsted

How are some molecules Lewis acids but not Bronsted acids?
Sat Dec 07, 2019 10:11 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic
Replies: 7
Views: 153

### Re: Amphiprotic

A amphiprotic molecule can both act as a proton acceptor and donator. It has both the characteristics of an acid and a base.
Mon Dec 02, 2019 12:37 am
Forum: Conjugate Acids & Bases
Topic: Definition
Replies: 7
Views: 95

### Re: Definition

Based on the Brønsted–Lowry acid–base theory, a conjugate acid is formed by a base receiving a proton. A conjugate base is the opposite - it is the base formed when the acid donates a proton.
Mon Dec 02, 2019 12:35 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Difference between inorganic and organic
Replies: 4
Views: 169

### Re: Difference between inorganic and organic

Simply put, organic compounds that acts as a base are called organic bases. They are usually proton acceptors and contain nitrogen since it can be easily protonated.
Mon Dec 02, 2019 12:33 am
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 369

### Re: Sigma vs. Pi

Sigma bonds are significantly stronger than pi bonds because of an overlap in orbitals.
Mon Dec 02, 2019 12:32 am
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shape
Replies: 21
Views: 378

### Re: T-shape

A t-shaped molecular geometry has 3 ligands attached to a central atom. The bonds form a 90 degrees and the attachments form a t-shape.
Mon Dec 02, 2019 12:30 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: seesaw
Replies: 4
Views: 85

### Re: seesaw

It is relevant in describing conjugate acids or bases that define a Brønsted-Lowry acid-base reaction.
Sat Nov 23, 2019 4:12 pm
Forum: Hybridization
Topic: 2F15
Replies: 4
Views: 102

### Re: 2F15

To give an example, sp hybridization has a bond angle of 180 while sp2 has a bond angle of 120. The s-characteristic of the sp hybridization is larger and has a larger bond angle.
Sat Nov 23, 2019 4:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Break
Replies: 4
Views: 92

### Re: Thanksgiving Break

Does anyone know if there's discussion on Wednesday?
Sat Nov 23, 2019 4:08 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: Hydrogen Bonding Rules
Replies: 6
Views: 85

### Re: Hydrogen Bonding Rules

There are two nitrogen atoms with a lone pair each, so it makes sense for there to be two hydrogen bonding sites.
Sat Nov 23, 2019 4:07 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 6
Views: 96

### Re: Sigma and Pi Bonds

The orbitals that form sigma bonds overlap more than the orbitals forming the pi bonds so they are much stronger.
Wed Nov 20, 2019 12:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 8
Views: 154

### Lone Pairs

What does it mean to "explain why lone pairs are more likely to found in certain locations around a central atom and
how and why they affect the bond angles in a molecule, cation, or anion"?
Sun Nov 17, 2019 11:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electronegativity
Replies: 6
Views: 62

### Re: electronegativity

Look up the electronegativity on the table and subtract the smaller electronegativity from the larger one.
Sun Nov 17, 2019 11:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER
Replies: 7
Views: 179

### Re: VSPER

Valence-shell electron-pair repulsion (VSEPR) is a model used to predict the 3d geometry of molecules based on the electron pairs and bonds.
Sun Nov 17, 2019 11:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance and VSEPR
Replies: 9
Views: 102

### Re: Resonance and VSEPR

Resonance structures do not affect vsepr structures - they only explain molecular shape.
Sun Nov 17, 2019 11:43 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 7
Views: 115

### Re: test 2

Are there any review worksheets being posted?
Tue Nov 12, 2019 11:42 pm
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 226

### Re: Week 7 Homework

Are we allowed to do 3F questions as well?
Fri Nov 08, 2019 9:34 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge
Replies: 9
Views: 734

### Re: Formal Charge

What's the equation for the formal charge?
Fri Nov 08, 2019 9:33 am
Forum: Lewis Structures
Replies: 26
Views: 461

Does anyone know if we'll get the actual midterm back? Or is it only our grades?
Fri Nov 08, 2019 9:32 am
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 252

### Re: Test 2

No, it should only cover new topics covered after the midterm.
Wed Nov 06, 2019 4:21 pm
Forum: Administrative Questions and Class Announcements
Replies: 52
Views: 4927

Does anyone know the answer to 11a?
Wed Nov 06, 2019 2:20 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 2
Views: 101

### Midterm

Are acids and bases on the midterm? I went over the homework questions and there was nothing on it, but the outline for bonding includes it. If so, what do you need to know?
Tue Oct 29, 2019 6:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 5 HW
Replies: 4
Views: 134

### Re: Week 5 HW

We finished the quantum world last week and started on chemical bonding so I also think it should be only chemical bonding for week 5.
Tue Oct 29, 2019 6:08 pm
Forum: Properties of Light
Topic: Wave vs. Particle Model
Replies: 2
Views: 53

### Wave vs. Particle Model

What do we need to know about the wave vs particle model of electromagnetic radiation? How would it be covered on a midterm if it did show up?
Tue Oct 29, 2019 6:06 pm
Forum: Resonance Structures
Topic: Expanded octets
Replies: 2
Views: 52

### Re: Expanded octets

The expanded octet needs open spots on the d orbital, which has a total of 10 electrons max. So I believe at most there would be 10 electrons added.
Tue Oct 29, 2019 6:04 pm
Forum: Resonance Structures
Topic: resonance vs resonance hybrid
Replies: 2
Views: 44

### Re: resonance vs resonance hybrid

Resonance hybrids have a structure written as the average of two+ structural formulas separated by a double-headed arrow. It is also defined as "the net sum of valid resonance structures."
Tue Oct 29, 2019 5:58 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 368

### Re: Midterm

I heard the midterm covers the fundamentals, quantum world, and chemical bonds, but try to focus more on quantum world.
Tue Oct 29, 2019 5:56 pm
Forum: Ionic & Covalent Bonds
Topic: Dipole vs ionic bond
Replies: 2
Views: 36

### Re: Dipole vs ionic bond

Partial charges are for polar covalent bonds and dipole moments, so I believe your TA mixed it up.
Tue Oct 29, 2019 5:54 pm
Forum: Trends in The Periodic Table
Topic: Energy of Noble Gases
Replies: 2
Views: 39

### Re: Energy of Noble Gases

I don't really know what you mean by lowest energy level, but the noble gases are the least reactive and have the lowest electronegativity.
Tue Oct 29, 2019 5:51 pm
Forum: Dipole Moments
Topic: intermolecular interactions
Replies: 2
Views: 56

### Re: intermolecular interactions

The post above pretty much sums it all up so here's a link if you want extra information: https://chem.libretexts.org/Bookshelves ... rown_et_al.)/11%3A_Liquids_and_Intermolecular_Forces/11.2%3A_Intermolecular_Forces
Tue Oct 29, 2019 5:50 pm
Forum: Administrative Questions and Class Announcements
Replies: 13
Views: 234

I usually do all the homework problems per each section after the lectures so that it'll help me study for the midterm. But technically, you only have to do 5 just to get the points for homework.
Tue Oct 29, 2019 5:49 pm
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 93

### Re: Study For midterm

A lot of the workshops offer worksheets and extra practice with certain topics. If you need help with a certain section, I would also try going to the step-ups. There are review sessions just for the midterm as well so I would definitely recommend attending these.
Tue Oct 29, 2019 5:47 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths
Replies: 15
Views: 215

### Re: Bond lengths

Does anyone know that actual length of double and triple bonds? Will we need to know this on the tests?
Tue Oct 29, 2019 5:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Do Midterm Review Sessions Repeat Topics?
Replies: 4
Views: 62

### Re: Do Midterm Review Sessions Repeat Topics?

There are many review sessions posted on the website so you should look at the schedule and plan out which ones you want to make.
Fri Oct 18, 2019 2:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ground State [ENDORSED]
Replies: 5
Views: 122

### Re: Ground State[ENDORSED]

In a ground state, the electrons are in the lowest energy levels and cannot be lowered any further by transferring them to different orbitals.
Fri Oct 18, 2019 2:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 1172

### Re: Best Way To Study?

I would try to go over all the homework problems and take notes on parts of the textbook that were a little more challenging conceptually. Also, I think it's really helpful to go to the workshops since they give out worksheets with more challenging questions that may come up on tests.
Thu Oct 17, 2019 3:27 pm
Forum: DeBroglie Equation
Topic: Constant Question
Replies: 7
Views: 129

### Re: Constant Question

I would use whatever value is given on the equation sheet to be safe. Rounding should always come at the end so don't be lazy when doing the calculations.
Thu Oct 17, 2019 3:22 pm
Forum: Properties of Light
Topic: EM Spectrum
Replies: 3
Views: 64

### Re: EM Spectrum

I think you might need to know ranges for visible light wavelengths (others that are longer/ shorter than visible) and maybe the different series (lyman, balmer, etc)
Fri Oct 11, 2019 9:55 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 3858

### Re: Showing Work for Limiting Reactant Calculations on Tests[ENDORSED]

Cassandra_1K wrote:For limiting reactants on the test do we have to explain how we know one is a limiting reactant or can we just specify which one?

You should show the work for how you found the limiting reactant. Even if you're wrong, you would be able to get partial credit for explaining.
Fri Oct 11, 2019 9:40 am
Forum: Properties of Light
Topic: Converting units
Replies: 8
Views: 77

### Re: Converting units

Since Angstroms are 1*10^-10m and nm are 1*10^-9m, the nm is 10 times larger than the Angstrom. To convert from nm to Angstrom, you would just multiply by 10.
Mon Oct 07, 2019 3:24 pm
Forum: Properties of Light
Topic: Chapter 1 Homework Question [ENDORSED]
Replies: 7
Views: 2766

### Re: Chapter 1 Homework Question[ENDORSED]

Personally I don't quite understand the correspondence between energy and "The extent of the change in the electrical field at a given point". Could someone explain this aspect please? Thank you! To clarify, "the extent of change" can be seen as slope. Try drawing it out: one wa...
Sun Oct 06, 2019 9:01 pm
Forum: General Science Questions
Topic: Periodic Table
Replies: 5
Views: 132

### Periodic Table

Does anyone know what the number in parenthesis next to the standard atomic weight stands for?
Ex.
H
hydrogen
1.00794(7)
What's the 7?
Sun Oct 06, 2019 8:57 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 6
Views: 137

### Re: Unit Conversions

I don't think the unit prefixes will be tested directly on the test, but it might come up in the questions (ex. How many molecules are there in 56 mg of...) I would recommend finding a mnemonic that corresponds with each prefix. There's a lot of them online so try finding one that's easy for you to ...
Mon Sep 30, 2019 8:54 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Calculations in Two-Step Reactions
Replies: 4
Views: 165

### Limiting Reactant Calculations in Two-Step Reactions

I went to the workshop today but had to leave early, so if anyone can explain this problem for me, I would be really grateful :') The following two-step reactions produces hydrogen: Step 1: CH4 +H2O - > CO + 3H2 Step 2: CO + H2O -> CO2 +H2 Given 0.036g of methane (CH4) and 0.108g of water, how much ...
Mon Sep 30, 2019 8:43 pm
Forum: Significant Figures
Topic: How to Write Out Final Answers
Replies: 5
Views: 84

### Re: How to Write Out Final Answers

Also, make sure to pay attention for the sig figs in the questions. Although they're small points, he still looks for them in final answers.