Search found 104 matches
- Sat Mar 13, 2021 4:50 pm
- Forum: General Rate Laws
- Topic: Rate determining step
- Replies: 38
- Views: 1771
Re: Rate determining step
The reaction can only occur as fast as its slowest step, so the rate of the reaction is determined by the rate of the slowest step.
- Sat Mar 13, 2021 4:49 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: "Thermodynamically Stable" vs "Kinetically Stable"
- Replies: 10
- Views: 1828
Re: "Thermodynamically Stable" vs "Kinetically Stable"
Even though a reaction may have a negative delta G and be technically spontaneous, there is sometimes too large of an activation barrier for the reaction to actually occur. Reactions like this are kinetically stable.
- Sat Mar 13, 2021 4:45 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: About k
- Replies: 26
- Views: 3093
Re: About k
I wish they used different variables...k and K look way too similar, esp in handwriting
- Sat Mar 13, 2021 4:42 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 466993
Re: Final Jitters
Cramming the night before a test always makes me to anxious to sleep, so make sure you have an hour or two to yourself before you go to bed! I used to have calc nightmares before my exams in high school because I'd go to bed thinking about the test.
- Sat Mar 13, 2021 2:08 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Textbook Problem 6N.13
- Replies: 6
- Views: 682
Re: Textbook Problem 6N.13
Ok good I thought I was going crazy because e^15 isn't 10^6!
- Sun Mar 07, 2021 1:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
Why did the bear dissolve in water?
It was a polar bear
It was a polar bear
- Sun Mar 07, 2021 1:23 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E vs E naught
- Replies: 36
- Views: 1979
Re: E vs E naught
E naught is under standard conditions, and is fixed! Sapling gives us a list of E naught values I believe
- Sun Mar 07, 2021 1:18 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Concept of Order (n)
- Replies: 7
- Views: 503
Re: Concept of Order (n)
Is the order of the reaction referring to the total sum of the order of the reactants?
- Sun Mar 07, 2021 1:13 pm
- Forum: General Rate Laws
- Topic: Order of a reaction
- Replies: 10
- Views: 753
Re: Order of a reaction
Will the experiments and results be likely given to us in a problem to interpret?
- Sun Mar 07, 2021 1:11 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Corrosion Prevention
- Replies: 5
- Views: 429
Re: Corrosion Prevention
Preventing contact with oxygen is a way to prevent corrosion, via a paint coating or plating with a different metal that isn't as reactive with oxygen.
- Sun Mar 07, 2021 1:05 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Types of Batteries
- Replies: 8
- Views: 599
Re: Types of Batteries
Rechargeable batteries utilize chemical reactions that are reversible, so energy can be put back in. Nonrechargable batteries use irreversible reactions.
- Sun Mar 07, 2021 12:53 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Glass pH meter electrode
- Replies: 2
- Views: 608
Glass pH meter electrode
Why is a pH meter electrode specified as glass? What does that material do for measuring the pH?
- Sun Mar 07, 2021 12:47 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: when can we not use -0.0592/n when finding the E of a cell?
- Replies: 10
- Views: 908
Re: when can we not use -0.0592/n when finding the E of a cell?
^^ When under nonstandard conditions, I think you have to use the pressure and temp specified in the problem
- Sun Mar 07, 2021 12:37 pm
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 45444
Re: Culinary Chemistry
Butterfly pea flower tea changes color with pH! People add lemon juice and it makes it look really cool.
- Sun Mar 07, 2021 12:32 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Charges
- Replies: 6
- Views: 504
Re: Balancing Charges
The list of rules on Sapling are pretty helpful, though there are a lot of them. You can find them in the homework under "Oxidation Rules"
- Sun Feb 21, 2021 3:28 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
What happens when you lower your body temperature to -273°C? Nothing, you're perfectly 0K!
- Sun Feb 21, 2021 3:23 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Meaning of K
- Replies: 55
- Views: 4483
Re: Meaning of K
Temperature is represented in equations by T, so an uppercase K in the equation refers to the equilibrium constant :)
- Sun Feb 21, 2021 3:18 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Stable vs Unstable Gibbs Free Energy
- Replies: 16
- Views: 2660
Re: Stable vs Unstable Gibbs Free Energy
If delta G is positive, it means the reaction is spontaneous in the reverse direction, making the products unstable since the reaction will favor creating products.
- Sun Feb 21, 2021 3:16 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Non-spontaneous exothermic reaction
- Replies: 14
- Views: 4663
Re: Non-spontaneous exothermic reaction
An exothermic reaction can be nonspontaneous if the change in entropy is negative and the temperature very high, making it a entropy dominant reaction. Spontaneity of a reaction depends on the sign of delta G, not delta H
- Sun Feb 21, 2021 3:14 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: entropy positive value
- Replies: 30
- Views: 2125
Re: entropy positive value
Change in entropy of the universe must always be positive, but by identifying smaller systems you can find negative entropy changes :)
- Sun Feb 21, 2021 3:12 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Entropy of Monoatomic vs Diatomic gas
- Replies: 5
- Views: 1630
Re: Entropy of Monoatomic vs Diatomic gas
Since there are more molecules in one mole of monatomic gas than 1 mole of diatomic, there's more disorder and therefore more entropy :)
- Sun Feb 14, 2021 1:56 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 study tips
- Replies: 26
- Views: 1613
Re: Midterm 2 study tips
The textbook problems are a lifesaver for me when studying! The sapling walkthroughs of the homework questions are also very useful to review.
- Sun Feb 14, 2021 1:54 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Delta G and Spontaneity
- Replies: 10
- Views: 815
Re: Delta G and Spontaneity
If delta G is positive, should we say its nonspontaneous or should we say its spontaneous in the reverse direction?
- Sun Feb 14, 2021 1:41 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Which R to use
- Replies: 42
- Views: 3390
Re: Which R to use
Check with the units given in the equation to decide which R to use! It's helpful to use different Rs so you don't have to always convert the units.
- Sun Feb 14, 2021 1:36 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Sign of work
- Replies: 17
- Views: 847
Re: Sign of work
I remember it by thinking that if the system is doing work, it loses the energy required to do that work, so the sign will be negative. If work is being done to it, it's gaining energy, so the sign will be positive
- Sun Feb 14, 2021 1:23 pm
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 45444
Re: Culinary Chemistry
I love seeing people make the fruit "caviar" by dropping fruit purees mixed with agar into oil, and they form little spheres since they don't mix with the oil!
- Sun Feb 07, 2021 2:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
A sign outside the hotel reads: "Great Day Rates, Even Better NO3- 's"
- Sun Feb 07, 2021 2:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: solving for q (grams vs mol)
- Replies: 5
- Views: 244
Re: solving for q (grams vs mol)
The value of R we use to calculate C depends on the units given to us in the rest of the problem, right? I've been using 8.314 since we usually get Joules.
- Sun Feb 07, 2021 2:35 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sign of Specific Heat Capacities
- Replies: 3
- Views: 138
Re: Sign of Specific Heat Capacities
Specific heat capacity is the amount of heat that must be absorbed to raise the temperature by one degree, so it is always positive.
- Sun Feb 07, 2021 2:34 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cv vs Cp
- Replies: 2
- Views: 143
Re: Cv vs Cp
From to one of the sapling problems, do we always use Cv when calculating Delta U?
- Sun Feb 07, 2021 2:27 pm
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 45444
Re: Culinary Chemistry
My brother and I once shattered a glass pan of brownies after putting it on a cold metal table straight out of the oven...truly tragic
- Sun Jan 31, 2021 7:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
A man was arrested last night for drinking battery acid, and later he was charged.
- Sun Jan 31, 2021 7:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 17182
Re: Vapor vs gas
Same thing! We just tend to say water vapor instead of water gas lol
- Sun Jan 31, 2021 6:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: reaction shifts
- Replies: 18
- Views: 881
Re: reaction shifts
Remember that temperature can be influenced by pressure changes as well!
Adding heat in an endothermic reaction will produce more products, since the forward reaction uses heat.
Adding heat in an exothermic reaction will produce more reactants, since the backwards reaction uses heat.
Adding heat in an endothermic reaction will produce more products, since the forward reaction uses heat.
Adding heat in an exothermic reaction will produce more reactants, since the backwards reaction uses heat.
- Sun Jan 31, 2021 6:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: endothermic/exothermic
- Replies: 43
- Views: 5105
Re: endothermic/exothermic
I remember it by remembering that if a phase change needs heat, it is endothermic. When I boil water and it turns to steam(gas), I need a source of heat to add to the water, making it endothermic. So going the opposite way, gas to liquid, it must be exothermic
- Sun Jan 31, 2021 6:50 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Figuring out bond enthalpy
- Replies: 11
- Views: 545
Re: Figuring out bond enthalpy
Depends on the values given in the question I think!
- Sun Jan 24, 2021 12:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
Why did the attacking army use acid?
To neutralize the enemy's base!
To neutralize the enemy's base!
- Sun Jan 24, 2021 12:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: percent ionization
- Replies: 6
- Views: 281
Re: percent ionization
For example, if it's a problem dealing with CH3COOH, you can calculate percent ionization with [CH3COO- at equilibrium]/[CH3COOH initial] x 100
- Sun Jan 24, 2021 12:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: acidic or basic salts?
- Replies: 3
- Views: 176
acidic or basic salts?
How do we determine whether a salt is acidic or basic? In Sapling it said that salts of weak acids would act as weak bases and vice versa, is that a pretty universal rule?
- Sun Jan 24, 2021 12:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Studying for Midterm #1
- Replies: 63
- Views: 3596
Re: Studying for Midterm #1
Last quarter, the sapling and textbook problems helped me the most! The sapling solutions are great references.
- Sun Jan 24, 2021 11:35 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 2 Question 3
- Replies: 6
- Views: 447
Re: Sapling Week 2 Question 3
I did both an approximation and without it, but got almost the same answer. Sapling only accepts the non-approximated with like 4 decimal places
- Sun Jan 17, 2021 1:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Neglecting Water
- Replies: 20
- Views: 1212
Re: Neglecting Water
The change in concentration of water will be negligible, so it's safe to ignore it :)
- Sun Jan 17, 2021 1:49 pm
- Forum: Ideal Gases
- Topic: Gas constant
- Replies: 9
- Views: 400
Re: Gas constant
Are the different values of R given on our equation sheet, or is there one standard one we should memorize to use?
- Sun Jan 17, 2021 1:47 pm
- Forum: Ideal Gases
- Topic: Sapling Question #4
- Replies: 11
- Views: 606
Re: Sapling Question #4
I was confused at first too, but you can use the partial pressures like a concentration and use an ICE table to solve for the pressures at equilibrium, which you can then add up :)
- Sun Jan 17, 2021 1:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Adding together two equilibrium equations
- Replies: 5
- Views: 418
Re: Adding together two equilibrium equations
When you increase the moles by multiplication, do you have to increase the moles of every participant?
- Sun Jan 17, 2021 1:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Question
- Replies: 4
- Views: 242
Re: Sapling Question
Like the others said above, the initial concentrations for the reactants will be .1, since they didn't create a new separate reaction :)
- Sun Jan 10, 2021 1:49 pm
- Forum: Ideal Gases
- Topic: value of R
- Replies: 24
- Views: 1190
Re: value of R
From what I could tell, atm is most common in this course, so we'll probably use that value
- Sun Jan 10, 2021 1:46 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 6708
Re: reversing reactions
Reverse reaction move towards the reactants, right? Does K only refer to the forward reaction or can we specify K(reverse)
- Sun Jan 10, 2021 1:44 pm
- Forum: Ideal Gases
- Topic: Bars to atm [ENDORSED]
- Replies: 41
- Views: 2271
Re: Bars to atm [ENDORSED]
I believe you should convert to atm when using the ideal gas law :)
- Sun Jan 10, 2021 1:42 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 160583
Re: Reading the textbook
Does anyone have tips on how to identify important information in a textbook? I find the reading to be dense, and we're not tested on a lot of things they mention.
- Sun Jan 10, 2021 1:40 pm
- Forum: Ideal Gases
- Topic: PV=nRT and concentration
- Replies: 27
- Views: 1800
Re: PV=nRT and concentration
Can you calculate K using all partial pressures, or do you need to convert to concentration?
- Sat Dec 12, 2020 6:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
What kind of fish has 2 sodium atoms?
2Na
2Na
- Sat Dec 12, 2020 2:55 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Ka and pH
- Replies: 6
- Views: 449
Re: Ka and pH
Is there a equation to relate Ka and pKa? I think I missed it in my notes :/
- Sat Dec 12, 2020 2:52 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa greater than pH
- Replies: 3
- Views: 235
Re: pKa greater than pH
When pKa is greater than pH, the compound will be protonated, and be neutrally charged :)
- Sat Dec 12, 2020 2:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: wedge and dash
- Replies: 14
- Views: 2804
Re: wedge and dash
Those are used to represent 3D structures! Imagine the wedge means the bond is coming towards you, and the dashed means its going away from you.
- Sat Dec 12, 2020 2:32 pm
- Forum: Biological Examples
- Topic: Hemoglobin vs. Myoglobin
- Replies: 30
- Views: 1457
Re: Hemoglobin vs. Myoglobin
One of the questions in the review session was asking what carbon monoxide binds to, and the answer was myoglobin. Could we probably also say hemoglobin?
- Fri Dec 11, 2020 9:58 pm
- Forum: Naming
- Topic: Ferrate for iron
- Replies: 5
- Views: 443
Re: Ferrate for iron
https://quizlet.com/104847493/ligand-na ... ash-cards/ This quizlet was helpful to me for memorizing names!
- Fri Dec 11, 2020 9:56 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to identify polydentates
- Replies: 2
- Views: 188
How to identify polydentates
Does anyone have some tips to help identify polydentates from their formulas?
- Fri Dec 11, 2020 9:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
Why is the neutron so rich?
They get everything free of charge
They get everything free of charge
- Fri Dec 11, 2020 9:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electron Geometry
- Replies: 8
- Views: 495
Electron Geometry
What's the difference between electron and molecular geometry?
- Fri Dec 11, 2020 9:43 pm
- Forum: Naming
- Topic: Naming quizlet
- Replies: 41
- Views: 2150
Re: Naming quizlet
Thank you so much!
- Fri Dec 11, 2020 9:41 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Calculating Ka
- Replies: 2
- Views: 124
Calculating Ka
I got from the lectures that the Ka value is Ka=([A-][H+])/[HA]. Has he said anything about if we will have to calculate any Ka value for the final?
- Fri Dec 11, 2020 9:39 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Titration
- Replies: 4
- Views: 402
Re: Titration
Probes and litmus papers can be used to test pH of a sample before you use it, but for titrations you generally know whether your sample is an acid or base.
- Fri Dec 11, 2020 9:37 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Memorizing Conjugates
- Replies: 4
- Views: 343
Re: Memorizing Conjugates
Going over them once or twice on quizlet is always helpful!
- Mon Nov 30, 2020 10:54 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electron vs Molecular Geometry
- Replies: 4
- Views: 228
Re: Electron vs Molecular Geometry
Will we need to have the electron geometry of different molecular structures memorized?
- Mon Nov 30, 2020 10:53 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Equatorial/ Axial Planes
- Replies: 14
- Views: 1023
Re: Equatorial/ Axial Planes
Think equator and axis! Equatorial planes go horizontal, and axial planes are vertical.
- Mon Nov 30, 2020 10:51 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR memorization
- Replies: 7
- Views: 598
Re: VSEPR memorization
Ouch, okay, thanks! Does anyone have any tips for memorization or should I go straight for the quizlet sets?
- Mon Nov 30, 2020 10:44 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
What do you call a C₆H₁₂O₆ molecule that can use its right and left hands equally well?
Ambidextrose
Ambidextrose
- Mon Nov 30, 2020 10:42 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polar v nonpolar molecules
- Replies: 30
- Views: 2754
Re: polar v nonpolar molecules
Polar molecules have polar bonds whose dipoles do NOT cancel out, while nonpolar molecules either have all nonpolar bonds or polar bonds that do cancel each other out.
- Mon Nov 30, 2020 10:41 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR memorization
- Replies: 7
- Views: 598
VSEPR memorization
For the final, are we expected to memorize the characteristics of the VSEPR model, or can we use a table like they give us in sapling?
- Mon Nov 30, 2020 10:40 am
- Forum: Hybridization
- Topic: How to simply determine hybridization
- Replies: 27
- Views: 11921
Re: How to simply determine hybridization
I just count the connected atoms, and then count my way up the orbitals with that number. 4=sp3, since sp3 is 4 orbitals
- Mon Nov 30, 2020 10:21 am
- Forum: Hybridization
- Topic: Determining the number of sigma and pi bonds
- Replies: 8
- Views: 1003
Re: Determining the number of sigma and pi bonds
The first bond of each are sigma bonds, so count every bond to get the number of sigma bonds. There is one pi bond for every double bond that appears, and two pi bonds for every triple bond.
- Mon Nov 30, 2020 10:16 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Delocalized vs localized
- Replies: 12
- Views: 772
Re: Delocalized vs localized
In general, you would see delocalized electrons with resonance structures, since they are not associated with a single atom
- Sun Nov 15, 2020 8:55 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Lewis acids and bases
- Replies: 22
- Views: 1295
Lewis acids and bases
What's a good way to determine whether a compound is an acid or a base? It has to do with charge, right?
- Sun Nov 15, 2020 8:50 pm
- Forum: Resonance Structures
- Topic: bond length
- Replies: 37
- Views: 2015
Re: bond length
Do we need to know the relative lengths of other bonds like hydrogen bonds?
- Sun Nov 15, 2020 8:47 pm
- Forum: Electronegativity
- Topic: Partial vs Formal charge
- Replies: 8
- Views: 1114
Partial vs Formal charge
Can someone explain the conceptual difference between partial and formal charges?
- Sun Nov 15, 2020 8:47 pm
- Forum: Bond Lengths & Energies
- Topic: Hydrogen Bonds
- Replies: 17
- Views: 954
Re: Hydrogen Bonds
The H in a hydrogen bond must be bonded to a very electronegative atom(like O) to make sure it has a slight positive charge
- Sun Nov 15, 2020 8:40 pm
- Forum: Octet Exceptions
- Topic: Octet Rule Exceptions
- Replies: 20
- Views: 1537
Re: Octet Rule Exceptions
Are we expected to memorize the exceptions for the midterm?
- Sun Nov 15, 2020 8:33 pm
- Forum: Resonance Structures
- Topic: Determining oxidation numbers?
- Replies: 9
- Views: 385
Re: Determining oxidation numbers?
Conceptually, what is the definition of oxidation numbers? The number of electrons an atom gains or loses in the compound?
- Sun Nov 08, 2020 8:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Scores
- Replies: 28
- Views: 1470
Re: Midterm Scores
Do you think we'll ever be able to see what we got wrong? It helps studying a lot to know what you missed on the last test.
- Sun Nov 08, 2020 8:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Taking Bio and Chem simultaneously
- Replies: 26
- Views: 2747
Re: Taking Bio and Chem simultaneously
Bio and chem simultaneously is manageable, especially since there is some overlap. Try to avoid chem and physics at the same time :) It's not going well
- Sun Nov 08, 2020 8:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Question Count
- Replies: 17
- Views: 769
Re: Midterm 2 Question Count
Are we doing respondus and zoom proctoring again?
- Sun Nov 08, 2020 8:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Character
- Replies: 7
- Views: 429
Re: Covalent Character
So does covalent character imply that ions are not fully transferred in ionic bonds, and are instead still shared to a degree because of the attraction?
- Sun Nov 08, 2020 8:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet rule exceptions
- Replies: 15
- Views: 675
Re: Octet rule exceptions
Will we need to know these exceptions? Where would they come up in a test?
- Sun Nov 01, 2020 1:51 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 9
- Views: 438
Re: Ionization Energy
Atoms try to achieve a full outer shell, so it takes the most energy to remove an electron from a full outer shell and the least to remove an electron from an atom with only 1 valence electron.
- Sun Nov 01, 2020 1:49 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbital reference sheet
- Replies: 4
- Views: 170
Orbital reference sheet
Does anyone know if we'll get a reference of the pattern and order of the orbitals on the exams? Or should we work on memorizing the patterns?
- Sun Nov 01, 2020 1:46 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4029608
Re: Post All Chemistry Jokes Here
Why did the cation try to cheer up the anion?
Because they're PAWsitive thinkers!
Because they're PAWsitive thinkers!
- Sun Nov 01, 2020 1:43 pm
- Forum: *Shrodinger Equation
- Topic: Application of Shrodinger's Equation
- Replies: 3
- Views: 276
Re: Application of Shrodinger's Equation
I'm having a little trouble understanding it conceptually, is it calculating the total energy of all electron in an atom? Or just one?
- Sun Nov 01, 2020 1:42 pm
- Forum: *Shrodinger Equation
- Topic: For Ms (spin up, spin down)
- Replies: 6
- Views: 671
Re: For Ms (spin up, spin down)
Do we ever use 0? Is there ever a situation in which an electron has no spin?
- Sun Oct 25, 2020 12:41 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg’s Constant
- Replies: 6
- Views: 371
Re: Rydberg’s Constant
So does the equation have to be rearranged depending on if it is emission or absorption? Or do we just plug in the values into the variables depending on the scenario?
- Sun Oct 25, 2020 12:34 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Amplitude
- Replies: 16
- Views: 850
Re: Amplitude
While frequency and wavelength are related, amplitude is just referring to the brightness or intensity. I think it does affect the height of the wave, but not frequency or wavelength.
- Sun Oct 25, 2020 12:25 pm
- Forum: Photoelectric Effect
- Topic: spectral lines
- Replies: 4
- Views: 301
Re: spectral lines
From the 7th level, it can fall back down to the 1st, 2nd, 3rd, 4th, 5th, or 6th level, giving it 6 possible lines.
- Sun Oct 25, 2020 12:24 pm
- Forum: DeBroglie Equation
- Topic: Rearranging De Broglie Equation
- Replies: 17
- Views: 2411
Re: Rearranging De Broglie Equation
Will we likely have to derive these equations during the midterm since they're not on the equation sheet?
- Sun Oct 25, 2020 12:22 pm
- Forum: Properties of Electrons
- Topic: Lyman and Balmer series
- Replies: 6
- Views: 307
Lyman and Balmer series
What is the difference between the two series? Are we expected to memorize their respective wavelengths?
- Sun Oct 18, 2020 2:33 pm
- Forum: Properties of Electrons
- Topic: Electrons Excited or Ejected
- Replies: 19
- Views: 1024
Re: Electrons Excited or Ejected
Do electrons release energy when they are exited and jump energy levels, or when they fall to lower levels?
- Sun Oct 18, 2020 2:31 pm
- Forum: Properties of Light
- Topic: Energy Levels
- Replies: 11
- Views: 668
Re: Energy Levels
Electron levels are helpful in visualizing the concept that their energy is measured discretely, not continuously. There are "steps" of energy levels, and the energy level they fall from corresponds to the energy released.
- Sun Oct 18, 2020 2:25 pm
- Forum: Properties of Light
- Topic: Equation masterlist
- Replies: 6
- Views: 446
Equation masterlist
Is there a list anywhere on here or the chem website where it has all the equations that we'll be allowed to refer to during exams? I feel like I keep missing equations in my notes.
- Sun Oct 18, 2020 2:21 pm
- Forum: Properties of Light
- Topic: Intensity v Energy
- Replies: 18
- Views: 694
Re: Intensity v Energy
From my understanding, intensity of light has to do with its amplitude, and it measures how many photons are present. Energy, however, is related to frequency of the wave, with the equation E=hv, with h being Plank's constant and v being wavelength.
- Sun Oct 18, 2020 2:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 4461
Re: Where can I buy a webcam for a reasonable price?
The ROSEBEAR 480P USB Webcam is $10 on amazon right now!
- Sun Oct 11, 2020 11:37 am
- Forum: Empirical & Molecular Formulas
- Topic: Calculation Errors for Empirical Formulas
- Replies: 10
- Views: 622
Re: Calculation Errors for Empirical Formulas
2.8 can most likely be rounded up, but if the number comes out closer to, for example, 2.5, multiply everything by 2 to get clean numbers