Search found 60 matches

by Tony Chung 2I
Mon Mar 11, 2019 8:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Finding n
Replies: 12
Views: 147

Re: Finding n

n is just the number of balanced electrons
by Tony Chung 2I
Mon Mar 11, 2019 8:37 pm
Forum: Balancing Redox Reactions
Topic: Oxidation vs Reduction Half Rxn
Replies: 9
Views: 68

Re: Oxidation vs Reduction Half Rxn

Oxidation loses electrons and reduction gains electrons.
by Tony Chung 2I
Mon Mar 11, 2019 8:36 pm
Forum: Balancing Redox Reactions
Topic: Oxidation number?
Replies: 12
Views: 124

Re: Oxidation number?

There are certain elements that have specific charges. You need to know these to properly balance the redox equation.
by Tony Chung 2I
Sat Mar 02, 2019 7:08 pm
Forum: Balancing Redox Reactions
Topic: Creating a cell diagram
Replies: 8
Views: 90

Re: Creating a cell diagram

You do not need to add them to the cell diagram (-:
by Tony Chung 2I
Sat Mar 02, 2019 7:05 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x
Replies: 16
Views: 201

Re: ignoring x

you can ignore x when youre approximating. this is when your k value is less than or equal to 10^-3
by Tony Chung 2I
Sat Mar 02, 2019 7:03 pm
Forum: Ideal Gases
Topic: pV=nRT
Replies: 12
Views: 162

Re: pV=nRT

You can use pv=nrt to find one of the constants like n,t,p,or v.
by Tony Chung 2I
Mon Feb 25, 2019 2:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Liquids in K expression
Replies: 2
Views: 56

Re: Solids and Liquids in K expression

Balance the entire equation first, and then omit the liquids and solids. This will reduce the chance of you making an error.
by Tony Chung 2I
Mon Feb 25, 2019 2:47 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increasing/Decreasing temp
Replies: 8
Views: 94

Re: Increasing/Decreasing temp

It can change which way the reaction proceeds.
by Tony Chung 2I
Mon Feb 25, 2019 2:46 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: System vs Surroundings
Replies: 7
Views: 94

Re: System vs Surroundings

The system is the thing that you're observing/looking at, while the surrounding is everything else.
by Tony Chung 2I
Sat Feb 23, 2019 4:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: When to use Quadratic equation
Replies: 10
Views: 135

Re: When to use Quadratic equation

You use the quadratic equation when you can't approximate because of how large the K value is. If the K value is greater than 10^-3, then you would have to use the quadratic formula.
by Tony Chung 2I
Sat Feb 23, 2019 4:02 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Direction of a Reaction
Replies: 8
Views: 106

Re: Direction of a Reaction

They should give you the value of k or they'll give you the correct values to solve for k.
by Tony Chung 2I
Sat Feb 23, 2019 4:01 pm
Forum: Ideal Gases
Topic: Approximations for ICE
Replies: 20
Views: 184

Re: Approximations for ICE

You can do this when your equilibrium constant value is less than 10^-3 because this value is extremely small.
by Tony Chung 2I
Sat Feb 23, 2019 3:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: increasing pressure, what happens to concentration?
Replies: 10
Views: 147

Re: increasing pressure, what happens to concentration?

Le Chatelier's Principle for pressure: if the pressure increases, the reaction will proceed towards the side with less moles of gas. if the pressure is decreased, the reaction will proceed towards the side with more moles of gas.
by Tony Chung 2I
Sat Feb 23, 2019 3:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reverse Reaction
Replies: 8
Views: 91

Re: Reverse Reaction

The reverse reaction is the inverse. so it would would 1/k
by Tony Chung 2I
Sat Feb 23, 2019 3:56 pm
Forum: Ideal Gases
Topic: ICE Table Values
Replies: 9
Views: 116

Re: ICE Table Values

It's typically for moles, concentration (M), and pressure. You can also start off with moles and then convert it to molarity after. Just make sure that your units are consistent all throughout the ice table.
by Tony Chung 2I
Wed Feb 06, 2019 11:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 1 Number 3c
Replies: 6
Views: 85

Re: Quiz 1 Number 3c

it should be mol/L or M. This is the case when they are asking for the concentration.
by Tony Chung 2I
Wed Feb 06, 2019 11:28 pm
Forum: Ideal Gases
Topic: Ideal gas constant R
Replies: 9
Views: 144

Re: Ideal gas constant R

That depends on the units that you are given and are working with.
by Tony Chung 2I
Wed Feb 06, 2019 11:27 pm
Forum: Phase Changes & Related Calculations
Topic: Negative work
Replies: 11
Views: 128

Re: Negative work

yes, it is a thing. This will happen when system does work on the surrounding.
by Tony Chung 2I
Mon Jan 28, 2019 3:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Exothermic vs. Endothermic
Replies: 10
Views: 123

Re: Exothermic vs. Endothermic

Endothermic: When energy is absorbed from its surroundings. delta H>0
Exothermic: When energy is released. delta H<0
by Tony Chung 2I
Mon Jan 28, 2019 3:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Memorizing bond enthalpies
Replies: 5
Views: 81

Re: Memorizing bond enthalpies

The values are usually given for the uncommon ones. Highly recommend to memorize the common ones though just to be safe!
by Tony Chung 2I
Mon Jan 28, 2019 3:21 pm
Forum: Phase Changes & Related Calculations
Topic: Heat Capacity
Replies: 10
Views: 91

Re: Heat Capacity

Heat capacity: amount of heat needed to raise the Temp. by 1 degree Celsius
Molar heat capacity: amount of heat needed to raise the Temp. of 1 mole of that certain substance by 1 degree Celsius
by Tony Chung 2I
Wed Jan 23, 2019 3:37 pm
Forum: Ideal Gases
Topic: OH and H3O
Replies: 10
Views: 186

Re: OH and H3O

You should also memorize the strong acids and bases that we had to use in 14A
by Tony Chung 2I
Wed Jan 23, 2019 3:36 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ice chart
Replies: 7
Views: 112

Re: ice chart

when they give you the initial value of a weak acid.
by Tony Chung 2I
Wed Jan 23, 2019 3:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Does [H3O+][OH-] always equal 10^-14?
Replies: 9
Views: 118

Re: Does [H3O+][OH-] always equal 10^-14?

Yes, only if the temperature of the water is at a constant temperature of 25 degrees celsius.
by Tony Chung 2I
Wed Jan 16, 2019 9:12 pm
Forum: Ideal Gases
Topic: pressure
Replies: 7
Views: 97

Re: pressure

You can do this by increasing the temperature.
by Tony Chung 2I
Wed Jan 16, 2019 9:07 pm
Forum: Ideal Gases
Topic: Water
Replies: 13
Views: 170

Re: Water

Water can be a solid, liquid, or gas. However, it cannot be an aqueous solution.
by Tony Chung 2I
Wed Jan 16, 2019 9:03 pm
Forum: Ideal Gases
Topic: K value
Replies: 8
Views: 128

Re: K value

It's rare because it's not common to have an equal amount of products and reactants.
by Tony Chung 2I
Wed Jan 09, 2019 3:08 pm
Forum: Ideal Gases
Topic: Temperature in PV=nRT
Replies: 9
Views: 476

Re: Temperature in PV=nRT

The unit for T in this case is always in Kelvin (K)
by Tony Chung 2I
Wed Jan 09, 2019 3:08 pm
Forum: Ideal Gases
Topic: Memorization
Replies: 12
Views: 299

Re: Memorization

you should memorize and the units just in case
by Tony Chung 2I
Wed Jan 09, 2019 3:07 pm
Forum: Ideal Gases
Topic: Q and K [ENDORSED]
Replies: 35
Views: 995

Re: Q and K [ENDORSED]

both of the formulas for Q and K are the same!
by Tony Chung 2I
Thu Dec 06, 2018 10:12 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Final Exam
Replies: 7
Views: 132

Re: Final Exam

I believe so. I recall my TA saying something about it during our discussion
by Tony Chung 2I
Thu Dec 06, 2018 10:10 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 6
Views: 86

Re: Strong Acids

Based off of what the person above me said, the longer the bond length, the weaker it is
by Tony Chung 2I
Thu Dec 06, 2018 9:59 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH calculation
Replies: 4
Views: 66

Re: pH calculation

This is normally given to you in the problem as a molarity
by Tony Chung 2I
Sun Dec 02, 2018 8:01 pm
Forum: Resonance Structures
Topic: Formal Charge
Replies: 11
Views: 223

Re: Formal Charge

you typically want the formal charge to be 0
by Tony Chung 2I
Sun Dec 02, 2018 7:59 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 273

Re: Octet vs formal charge

having a formal charge of 0
by Tony Chung 2I
Sun Nov 25, 2018 5:27 pm
Forum: Hybridization
Topic: Hybridization and molecular shape
Replies: 3
Views: 47

Re: Hybridization and molecular shape

lone pairs affect the shape
by Tony Chung 2I
Sun Nov 25, 2018 5:26 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Lengths
Replies: 10
Views: 214

Re: Bond Lengths

You can take the average of the two
by Tony Chung 2I
Sun Nov 25, 2018 5:24 pm
Forum: Properties of Electrons
Topic: Determining the Probability of Finding an Electron in an Orbital: Test 2
Replies: 2
Views: 86

Re: Determining the Probability of Finding an Electron in an Orbital: Test 2

I think that the probability of finding that is very low or close to 0
by Tony Chung 2I
Sun Nov 18, 2018 7:02 pm
Forum: Hybridization
Topic: Bond Angles
Replies: 12
Views: 181

Re: Bond Angles

Drawing the structure is highly recommended when determining the bond angle.
by Tony Chung 2I
Sun Nov 18, 2018 7:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs and bond angle
Replies: 6
Views: 80

Re: lone pairs and bond angle

This is because the lone pairs push away the other atoms resulting in a larger bond angle.
by Tony Chung 2I
Sun Nov 18, 2018 6:59 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. Electron Affinity?
Replies: 9
Views: 195

Re: Electronegativity vs. Electron Affinity?

Electronegativity and electron affinity are different. Electronegativity is how well the electrons are attracted to an atom, and electron affinity is the amount of energy needed to release an electron.
by Tony Chung 2I
Wed Nov 07, 2018 9:25 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 11
Views: 235

Re: Formal Charge

You cannot determine an element/compound just by using formal charge alone. The formal charge does not have to be zero. If it is zero, that means that it is at its most stable point.
by Tony Chung 2I
Wed Nov 07, 2018 9:23 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energies
Replies: 13
Views: 182

Re: Ionization Energies

That is correct. Helium has the highest ionization energy.
by Tony Chung 2I
Wed Nov 07, 2018 9:22 pm
Forum: Resonance Structures
Topic: bond length
Replies: 5
Views: 104

Re: bond length

It is because of resonance. Resonance tells us that there is more than one lewis structure for a specific compound.
by Tony Chung 2I
Tue Oct 30, 2018 5:25 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.5 7th edition
Replies: 5
Views: 76

Re: 2A.5 7th edition

Cu and Cr are special cases which means that they have different electron configurations.
by Tony Chung 2I
Tue Oct 30, 2018 5:17 pm
Forum: Resonance Structures
Topic: Lengths of bonds
Replies: 3
Views: 86

Re: Lengths of bonds

Double bonds are stronger that single bonds. This means that double bonds have a stronger pull, resulting in a shorter length.
by Tony Chung 2I
Tue Oct 30, 2018 5:11 pm
Forum: Lewis Structures
Topic: Dots in Lewis Stucture
Replies: 14
Views: 239

Re: Dots in Lewis Stucture

It doesn't matter as long as you put the right amount of dots and bonds.
by Tony Chung 2I
Fri Oct 26, 2018 2:06 am
Forum: Properties of Light
Topic: Test 2
Replies: 7
Views: 235

Re: Test 2

It'll be very helpful to go over Lavelle's "outline 2" document on his website.
by Tony Chung 2I
Fri Oct 26, 2018 2:06 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 241

Re: Rydberg Equation

I believe I heard during lecture that it is final - initial.
by Tony Chung 2I
Fri Oct 26, 2018 1:58 am
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 8
Views: 287

Re: Sig Figs

Always use the amount of sig figs that they give you in the question.
by Tony Chung 2I
Thu Oct 18, 2018 3:02 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What the equation is used for
Replies: 5
Views: 81

Re: What the equation is used for

The Heisenberg uncertainty equation is used to find a particles position and momentum.
by Tony Chung 2I
Thu Oct 18, 2018 3:00 pm
Forum: Einstein Equation
Topic: Photons and E=hv
Replies: 5
Views: 209

Re: Photons and E=hv

E gives the energy of one photon, v is frequency, and h is planck's constant.
by Tony Chung 2I
Thu Oct 18, 2018 2:58 pm
Forum: Properties of Light
Topic: Wave/particles
Replies: 5
Views: 72

Re: Wave/particles

You can see the similarities through the wave-particle duality. Light has very similar qualities of both wave and particles.
by Tony Chung 2I
Sat Oct 13, 2018 7:07 pm
Forum: Properties of Light
Topic: E=hv
Replies: 13
Views: 174

Re: E=hv

The equation tells us that E is the energy of light, which is also called a photon.
by Tony Chung 2I
Fri Oct 12, 2018 6:18 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum: Colors
Replies: 3
Views: 34

Re: Electromagnetic Spectrum: Colors

It'll probably fall in between the colors blue and green, giving it a cyan color.
by Tony Chung 2I
Fri Oct 12, 2018 6:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 30426

Re: Advice from a Medical Student [ENDORSED]

Thank you for giving me the advice that I needed!
by Tony Chung 2I
Fri Oct 05, 2018 2:56 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy and Precision
Replies: 4
Views: 63

Re: Accuracy and Precision

Picture an archer doing target practice. If the archer is relatively hitting the same spot on the target, that would be considered as precise. If the archer is constantly hitting the bullseye, that would be considered as accurate.
by Tony Chung 2I
Fri Oct 05, 2018 2:48 am
Forum: SI Units, Unit Conversions
Topic: units during dimensional analysis
Replies: 4
Views: 85

Re: units during dimensional analysis

Writing out the units will definitely save you from making mistakes. As the problems get more detailed, writing the units down will be much more beneficial to you.
by Tony Chung 2I
Fri Oct 05, 2018 2:44 am
Forum: Significant Figures
Topic: Scientific Notation
Replies: 7
Views: 105

Re: Scientific Notation

I think that it's based off of personal preference. It should not matter which format you write your answer in, unless the question specifically asks you to write it a certain way.

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