## Search found 59 matches

Wed Mar 13, 2019 10:12 pm
Forum: General Rate Laws
Topic: rate laws and graphs
Replies: 4
Views: 104

### Re: rate laws and graphs

You should probably know what the graphs generally look like and how the graphs are related to the equations.
Wed Mar 13, 2019 10:11 pm
Forum: General Rate Laws
Topic: Rate equations to know
Replies: 5
Views: 115

### Re: Rate equations to know

You should probably know the different rate laws, and the different equations that can be derived from them or link them to other equations.
Wed Mar 13, 2019 10:10 pm
Forum: General Rate Laws
Topic: reaction rate vs. unique reaction rate
Replies: 3
Views: 102

### Re: reaction rate vs. unique reaction rate

unique reaction rate takes into account stoichiometric coefficients, or the order of the reaction
Tue Mar 05, 2019 7:32 pm
Forum: General Rate Laws
Topic: Units of Rate Constant
Replies: 4
Views: 132

### Re: Units of Rate Constant

each order's units are different. However, Cole's units are correct and are very helpful in figuring out which order is being used.
Tue Mar 05, 2019 7:31 pm
Forum: Zero Order Reactions
Topic: Units of k in Zero Order Reactions
Replies: 4
Views: 119

### Re: Units of k in Zero Order Reactions

both are the same. and depending on which order it is, you would change it accordingly.
Tue Mar 05, 2019 7:29 pm
Forum: Zero Order Reactions
Topic: Different Orders
Replies: 5
Views: 145

### Re: Different Orders

According to my TA, we will only be focusing on 0,1,and 2.
Tue Mar 05, 2019 7:29 pm
Forum: Zero Order Reactions
Topic: Half life
Replies: 5
Views: 147

### Re: Half life

theres different half life reactions for zero, 1st, and 2nd order. Only 1st order is independent of the concentration of A.
Tue Mar 05, 2019 7:28 pm
Forum: General Rate Laws
Topic: Unique Rate
Replies: 4
Views: 137

### Re: Unique Rate

the unique rate produces the same rate no matter which species you use.
Wed Feb 20, 2019 4:49 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs concept
Replies: 7
Views: 233

### Re: Gibbs concept

Gibbs is the amount of free energy available to do work, but is related to enthalpy and entropy.
Wed Feb 20, 2019 4:46 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: irreversible v reversible
Replies: 4
Views: 306

### Re: irreversible v reversible

Since S is a state function, the path it takes doesn't matter, therefore if it returns to the original state, entropy is 0.
Wed Feb 20, 2019 4:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta Srxn
Replies: 4
Views: 383

### Re: Delta Srxn

m is just molar! so Sm is molar entropy
Wed Feb 20, 2019 4:43 pm
Forum: Van't Hoff Equation
Topic: when to use
Replies: 4
Views: 155

### Re: when to use

van't hoff equation helps establish a relationship between K and Gibbs
Wed Feb 20, 2019 4:41 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Max Work
Replies: 5
Views: 143

### Re: Max Work

Max work occurs reversibly at constant temp and pressure
Wed Feb 20, 2019 4:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Units for Gibbs
Replies: 8
Views: 241

### Re: Units for Gibbs

It doesn't matter which one you convert to, as long as you make sure both are in the same units
Sat Feb 09, 2019 11:57 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated System
Replies: 5
Views: 332

### Re: Isolated System

Isolated systems take away any other factors that can be impacting the reaction.
Sat Feb 09, 2019 11:57 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed systems
Replies: 6
Views: 149

### Re: closed systems

They can have both. However heat can be transferred in a closed system.
Sat Feb 09, 2019 11:56 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 49
Views: 1674

### Re: Midterm[ENDORSED]

The workshops are so so helpful!! Definitely go to Lyndon's, but make sure you go early to save yourself a seat!
Sat Feb 02, 2019 1:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Work Calculation
Replies: 3
Views: 97

### Re: Work Calculation

the negative sign tells us whether the system is doing work or if work is being done on they system
Sat Feb 02, 2019 1:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: breaking double bonds?
Replies: 6
Views: 123

### Re: breaking double bonds?

single bonds are not just the half of a double bond. instead to break a double bond and form a single bond, the double bond has to break completely
Sat Feb 02, 2019 1:57 pm
Forum: Phase Changes & Related Calculations
Topic: Phase change and temperature
Replies: 3
Views: 111

### Re: Phase change and temperature

all of the energy used is for the transition phase so doesn't get used up.
Sat Feb 02, 2019 1:56 pm
Forum: Phase Changes & Related Calculations
Topic: Entropy vs Enthalpy concept
Replies: 3
Views: 110

### Re: Entropy vs Enthalpy concept

enthalpy is the total amount of energy while entropy represents the internal disorder that results every time energy is transferred
Sat Feb 02, 2019 1:55 pm
Forum: Phase Changes & Related Calculations
Topic: What Does U and q stand for?
Replies: 9
Views: 232

### Re: What Does U and q stand for?

U is the internal energy while q is the internal heat.
Sat Feb 02, 2019 1:54 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 11
Views: 311

### Re: Steam

steam causes more severe burns because steam has more energy if you look at its heating curve.
Sat Jan 19, 2019 3:13 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Catalysts
Replies: 7
Views: 277

### Re: Catalysts

Catalysts only effect the activation energy, and doesn't effect the reaction itself at all.
Sat Jan 19, 2019 3:12 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Weak Acids and Bases
Replies: 7
Views: 209

### Re: Weak Acids and Bases

I think memorizing the strong acids and bases would be helpful, but if the Ka or Kb is given, you will be able to know if its weak or strong based on how small the number is.
Sat Jan 19, 2019 3:11 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Understanding Q
Replies: 9
Views: 187

### Re: Understanding Q

Hi!
Q is calculated the same way as K, but instead of being the equilibrium concentration, it can tell you which way the reaction is proceeding.
Sun Jan 13, 2019 7:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equations
Replies: 10
Views: 183

### Re: equations

You would have to figure out the equation. Some equations are more familiar and you would be able to figure it out easily. For others, theres probably context or hints as to which are the reactants or products.
Sun Jan 13, 2019 7:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solids and liquids
Replies: 5
Views: 168

### Re: solids and liquids

Solid and Liquid concentrations change very little, and the amount is insignificant so that they don't need to be included.
Sun Jan 13, 2019 7:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: constants
Replies: 4
Views: 130

### Re: constants

Hi! Kc, Kp, and Q are all very similar. Kc is just the equilibrium concentration while Kp is the pressure at equilibrium. Q finds which way the reaction is going.
Sun Jan 13, 2019 7:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure and Concentration [ENDORSED]
Replies: 3
Views: 86

### Re: Partial Pressure and Concentration[ENDORSED]

Hi! I think in that case you would just use PV= nRT to convert!
Sun Dec 09, 2018 12:16 am
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids and Bases Concept
Replies: 2
Views: 258

### Re: Conjugate Acids and Bases Concept

Yes, they both correspond to each other.
Sun Dec 09, 2018 12:14 am
Forum: Naming
Topic: Polarizability
Replies: 2
Views: 129

### Re: Polarizability

The bigger the radius, the more polarizable. And with more electrons, it will also be more polarizable.
Sun Dec 09, 2018 12:13 am
Forum: Naming
Topic: Ligand Names
Replies: 4
Views: 346

### Re: Ligand Names

I think you can use either. Many TAs and UAs have said they prefer the old names, which makes sense because they're easier. For the test, both will be correct.
Sun Dec 09, 2018 12:12 am
Forum: Naming
Topic: Shorthands
Replies: 2
Views: 95

### Re: Shorthands

it can be used when naming, but when putting it in brackets, you should know what it consists of. Also better to just know the full name as well.
Sun Dec 09, 2018 12:11 am
Forum: Naming
Topic: Memorizing Ligands
Replies: 2
Views: 127

### Re: Memorizing Ligands

I just compared the ones with similar names and figured out what adding each molecule does. For example, in CN-, NC-, or SCN- or NCS-, adding the S adds a thio-. When N is moved to the front, it adds an iso-
Sun Dec 09, 2018 12:09 am
Forum: Naming
Topic: Coordination Compound Charges
Replies: 1
Views: 61

### Re: Coordination Compound Charges

Yes unless theres another molecule that balances it all out.
Sun Dec 09, 2018 12:09 am
Forum: Naming
Topic: Order of ligands
Replies: 6
Views: 395

### Re: Order of ligands

It doesn't matter in the square brackets, only when you're naming it.
Sat Nov 17, 2018 10:12 pm
Forum: Dipole Moments
Topic: sigma, pi bonds rotation
Replies: 2
Views: 61

### Re: sigma, pi bonds rotation

When it cannot rotate around, the bond ends up breaking.
Sat Nov 17, 2018 10:10 pm
Forum: Octet Exceptions
Topic: Tin with only 6 electrons
Replies: 4
Views: 337

### Re: Tin with only 6 electrons

Since tin isn't in the first period, it can be an exception to the rule.
Sat Nov 17, 2018 10:06 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds affect on structure
Replies: 4
Views: 149

### Re: Sigma and Pi Bonds affect on structure

Sigma and Pi bonds do not affect structure. The only things that impact the structure is the lone pairs and bonds
Sun Nov 11, 2018 11:20 pm
Forum: Resonance Structures
Topic: Hybrid Resonance
Replies: 4
Views: 374

### Re: Hybrid Resonance

Hybrid resonance is just kind of the average of all possible resonance structures.
Sun Nov 11, 2018 11:18 pm
Forum: Octet Exceptions
Topic: Copper ion electron structure
Replies: 3
Views: 186

### Re: Copper ion electron structure

"Cu2+ ends up having the electron structure [Ar] 3d9. Why would this be, since filling the d orbital in this way does not result in a fully filled d orbital? Why is the structure not [Ar]3d7 4s2?" One easier way to figure it out is by first using the ground state configuration: Cu: [Ar] 3d...
Sun Nov 11, 2018 11:15 pm
Forum: Electronegativity
Topic: Greater Ionic character
Replies: 3
Views: 132

### Re: Greater Ionic character

Since Sulfur is below Oxygen in the periodic table, it is less electronegative. So Carbon and Oxygen have greater difference in electronegativity.
Fri Nov 02, 2018 7:35 pm
Forum: Dipole Moments
Topic: Midterm Dipole Moments?
Replies: 4
Views: 153

### Re: Midterm Dipole Moments?

The stuff we learned today will not be on the midterm, but is always good to keep in mind!
Fri Nov 02, 2018 7:34 pm
Forum: Electronegativity
Topic: Periodic Trends
Replies: 10
Views: 477

### Re: Periodic Trends

Ionization energy and electronegativity both increase up and to the right.
Atomic radius increases down and to the left.
Fri Nov 02, 2018 7:13 pm
Forum: Octet Exceptions
Topic: Boron and Aluminum
Replies: 2
Views: 126

### Re: Boron and Aluminum

Boron is electron deficient, and usually only makes three covalent bonds. This means that it only has 6 valence electrons.
Sun Oct 28, 2018 11:04 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation
Replies: 4
Views: 166

### Re: Heisenberg Indeterminacy Equation

The formula shows that you will either know the momentum or the position. And they are both uncertain. The higher certainty of one means that there is more uncertainty of the other.
Sun Oct 28, 2018 11:01 pm
Forum: Photoelectric Effect
Topic: HW 1.3
Replies: 4
Views: 227

### Re: HW 1.3

Hi, I also think C is the right answer as frequency decreases, the wavelength changes. The slope therefore decreases.
Wed Oct 24, 2018 11:31 am
Forum: Properties of Electrons
Topic: Degeneracy
Replies: 11
Views: 498

### Degeneracy

Hi! Can someone please explain degeneracy of electrons?

Thanks
Fri Oct 19, 2018 12:56 am
Forum: Properties of Light
Topic: Electromagnetic Radiation
Replies: 3
Views: 79

### Re: Electromagnetic Radiation

Hi!
In this question, extent of change is really just asking how the slope is changing. When frequency decreases, the slope also decreases.
Fri Oct 19, 2018 12:49 am
Forum: Properties of Electrons
Topic: electrons
Replies: 3
Views: 91

### Re: electrons

It is impacted by electron repulsion, where electrons repel each other because of their charge. Electrons will stay as far as they can from each other, while also still staying in their orbital.
Fri Oct 19, 2018 12:47 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Video Modules
Replies: 7
Views: 255

### Re: Video Modules

As of right now, Prof Lavelle has not posted any more modules. Hopefully after he introduces the next topic, he will upload more modules.
Fri Oct 12, 2018 12:06 am
Forum: Properties of Light
Topic: Homework Question 1.3, 6th Edition
Replies: 2
Views: 127

### Re: Homework Question 1.3, 6th Edition

"Does this happen when the frequency of light decreases? Why?
(c) The extent of the change in the electrical field at a given
point decreases."

Yes because as frequency changes, the waves become wider and longer, which means the slope decreases as well.
Fri Oct 12, 2018 12:03 am
Forum: Properties of Light
Topic: How light behaves
Replies: 8
Views: 248

### Re: How light behaves

Photons are packets of energy, but the energy can be seen as wavelengths. The wavelengths can show the amount of energy and frequency.
Fri Oct 12, 2018 12:01 am
Forum: Properties of Light
Topic: Problem number 1.23 [ENDORSED]
Replies: 3
Views: 100

### Re: Problem number 1.23[ENDORSED]

1 kilo-electronvolt = 1.60218^-16 Joules
Fri Oct 05, 2018 1:13 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula
Replies: 6
Views: 241

### Re: Empirical Formula

We just assume that it is 100g unless otherwise stated to make it easier to calculate percentages.
Thu Oct 04, 2018 11:55 pm
Forum: Molarity, Solutions, Dilutions
Topic: Q E27
Replies: 4
Views: 147

### Re: Q E27

To find the mass of one water molecule, divide it by Avogadro's number and then multiply it by the molar mass of water.
Mon Oct 01, 2018 9:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity
Replies: 3
Views: 455

### Re: Molarity

Thank you so much!
Mon Oct 01, 2018 9:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity
Replies: 3
Views: 455

### Molarity

How do I find the amount of moles for water molecules in MgSo4 + 7H2O (epsom salts) when there is 5.15g of epsom salt?

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