Search found 61 matches

by haleyervin7
Wed Mar 13, 2019 9:18 pm
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 11
Views: 291

Re: Catalysts

Is there any case where there must be a catalyst for a reaction to occur?
by haleyervin7
Wed Mar 13, 2019 9:16 pm
Forum: Experimental Details
Topic: Pre Equilibruim Approach
Replies: 6
Views: 463

Re: Pre Equilibruim Approach

Do you need the observed rate to be given for this approach?
by haleyervin7
Wed Mar 13, 2019 9:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: NO as a catalyst for O2 to O3
Replies: 1
Views: 13

NO as a catalyst for O2 to O3

In this environmental example Dr. Lavelle explained in class today, must NO always be present for the reaction from oxygen to ozone to occur, or is it just that it makes it happen more often/easily?
by haleyervin7
Wed Mar 06, 2019 9:02 pm
Forum: First Order Reactions
Topic: order
Replies: 5
Views: 39

Re: order

Is it possible to know the order based on the balanced chemical equation? What other information would you need?
by haleyervin7
Wed Mar 06, 2019 9:00 pm
Forum: Zero Order Reactions
Topic: General Meaning of "Zero Order" Reactions
Replies: 7
Views: 51

Re: General Meaning of "Zero Order" Reactions

Celine Cheng 1H wrote:If the reaction rate is dependent on a catalyst, does that mean the substrate has to be in high concentration as well?

Dr. Lavelle said to assume the catalyst/enzyme is saturated with substrate (meaning it is already working at maximum capacity) so adding substrate doesn't change the rate.
by haleyervin7
Wed Mar 06, 2019 8:58 pm
Forum: General Rate Laws
Topic: Negative sign for reactant rate
Replies: 2
Views: 16

Negative sign for reactant rate

Is the purpose of the negative sign just to make sure all the rates are positive? Can you assume that all initial reactant rates are negative and therefore become positive after adding the negative sign?
by haleyervin7
Wed Feb 27, 2019 8:32 pm
Forum: Balancing Redox Reactions
Topic: oxidizing agent and reducing agent
Replies: 15
Views: 106

Re: oxidizing agent and reducing agent

The reactant of the reduction half reaction is the oxidizing agent. The reactant of the oxidation half reaction is the reducing agent.
by haleyervin7
Wed Feb 27, 2019 8:30 pm
Forum: Balancing Redox Reactions
Topic: 14.13 6th edition [ENDORSED]
Replies: 2
Views: 38

Re: 14.13 6th edition [ENDORSED]

Does it matter if we use Pt(s) or C(s,graphite)? Do they have the same function? Are there any cases where you could use one but not the other?
by haleyervin7
Wed Feb 27, 2019 8:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cell Diagram [ENDORSED]
Replies: 3
Views: 47

Re: Galvanic Cell Diagram [ENDORSED]

Does it matter the order when they are only separated by a comma? E.g., if there are two aqueous solutions, does it matter which one we list first?
by haleyervin7
Wed Feb 20, 2019 9:58 pm
Forum: Balancing Redox Reactions
Topic: H2O
Replies: 3
Views: 39

H2O

How do you know when/where to add H2O or H+ to the half reactions/balanced reaction when it is not in the original reaction given?
by haleyervin7
Wed Feb 20, 2019 9:55 pm
Forum: Balancing Redox Reactions
Topic: determining cathode from anode
Replies: 11
Views: 320

Re: determining cathode from anode

Megan_Ervin_1F wrote:Also it is just standard for the anode to appear on the left

You can remember this because it is alphabetical from left to right (anode-cathode).
by haleyervin7
Wed Feb 20, 2019 9:52 pm
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 77

Re: Week 7 Homework

I think anything that will be on Test 2 is fine. He posted what would be covered on the test in his last announcement.
by haleyervin7
Wed Feb 13, 2019 4:46 pm
Forum: Phase Changes & Related Calculations
Topic: ΔH vs ΔU?
Replies: 8
Views: 107

Re: ΔH vs ΔU?

Can deltaU ever equal deltaH?
by haleyervin7
Wed Feb 13, 2019 4:44 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: ΔS=q/t
Replies: 8
Views: 85

Re: ΔS=q/t

What are the requirements to be able to use q/T? Just constant temp?
by haleyervin7
Wed Feb 13, 2019 4:43 pm
Forum: Calculating Work of Expansion
Topic: moles and entropy
Replies: 3
Views: 33

Re: moles and entropy

Does this mean in a problem that gives you the amount of liters of an ideal gas (i.e. 5 L of Ne), you’d assume the molarity is 0.2?
by haleyervin7
Thu Feb 07, 2019 12:27 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Irreversible vs. Reversible Expansion
Replies: 4
Views: 52

Re: Irreversible vs. Reversible Expansion

In real life, reversible reactions are unrealistic, but we use them to approximate. Almost all real reactions are irreversible.
by haleyervin7
Thu Feb 07, 2019 12:26 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Open vs Closed System
Replies: 13
Views: 116

Re: Open vs Closed System

In an open system both material and energy can be exchanged, but in a closed system only energy can. To put this in everyday terms, compare a glass of water with a sealed bottle of water. In the glass, water and heat can be added, but in the sealed bottle, only heat can be added.
by haleyervin7
Thu Feb 07, 2019 12:22 am
Forum: Phase Changes & Related Calculations
Topic: Heating Curve
Replies: 4
Views: 39

Re: Heating Curve

Since temperature doesn’t change during phase change, for steam to become water again (when it hits your skin), it has to release a lot of energy, while still at 100 degrees Celsius, and all this energy goes into burning your skin.
by haleyervin7
Wed Jan 30, 2019 9:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Regular heat capacity: why?
Replies: 4
Views: 43

Re: Regular heat capacity: why?

Sometimes if you are calculating the total energy transfer, you would need to calculate heat capacity from specific heat, by multiplying by the amount of substance, so it could be useful to have the heat capacity for the amount of substance you have in the first place.
by haleyervin7
Wed Jan 30, 2019 9:04 pm
Forum: Calculating Work of Expansion
Topic: negative vs. positive internal energy
Replies: 2
Views: 31

negative vs. positive internal energy

What is happening physically in a system when the change of internal energy of a system is negative vs. positive?
by haleyervin7
Wed Jan 30, 2019 8:57 pm
Forum: Calculating Work of Expansion
Topic: Units
Replies: 1
Views: 32

Units

Hi, can someone please explain the units and how they cancel in the work equation?
by haleyervin7
Wed Jan 23, 2019 11:14 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Strong Acids and Bases
Replies: 3
Views: 31

Re: Strong Acids and Bases

Does this mean we don't need to calculate the pKa or pKb for strong acids or bases?
by haleyervin7
Wed Jan 23, 2019 11:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solubility
Replies: 1
Views: 29

Solubility

How can equilibrium constants be used to predict solubility?
by haleyervin7
Wed Jan 23, 2019 11:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Strong vs Weak Acids
Replies: 2
Views: 36

Strong vs Weak Acids

Why do solutions of weak acids have higher pH values than solutions of strong acids at the
same concentration?
by haleyervin7
Thu Jan 17, 2019 12:25 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration less than 10^-7
Replies: 4
Views: 23

Re: Concentration less than 10^-7

Is this because you are basically taking the answer you got (e.g. 10^-9) and adding it to the already existing 10^-7, so it doesn't really change from neutral?
by haleyervin7
Thu Jan 17, 2019 12:23 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants
Replies: 5
Views: 62

Equilibrium Constants

How does K differ from Kc? If there is a difference, how would you solve for K when given Kc and vice versa?
by haleyervin7
Thu Jan 17, 2019 12:21 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 3
Views: 27

ICE tables

How does an ICE table change when the stoichiometric coefficient isn't 1?
by haleyervin7
Wed Jan 09, 2019 10:23 pm
Forum: Ideal Gases
Topic: Ideal vs Real Gas
Replies: 6
Views: 56

Re: Ideal vs Real Gas

For purposes of calculation, do we always assume it is an ideal gas?
by haleyervin7
Wed Jan 09, 2019 10:13 pm
Forum: Ideal Gases
Topic: Memorization
Replies: 12
Views: 272

Re: Memorization

Will there be any equilibrium constants that we need to memorize for certain equations or will all the information we need be given in the problems?
by haleyervin7
Wed Jan 09, 2019 10:10 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 500

Re: New to Lavelle

For the midterm and final Lavelle plans a lot of review sessions, but I would say the most helpful is Lyndon's because he goes over a review sheet that he made, but the other review sessions are more helpful if you have specific questions or topics you struggle with. The UA Karen also posts weekly r...
by haleyervin7
Thu Dec 06, 2018 6:54 pm
Forum: Naming
Topic: Cyanide (cyano vs isocyano)
Replies: 2
Views: 54

Re: Cyanide (cyano vs isocyano)

How will we know which one to use if we aren't given the lewis structure?
by haleyervin7
Thu Dec 06, 2018 6:50 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength of an acid/base
Replies: 2
Views: 51

Strength of an acid/base

How do we tell which weak acid or base is strongest when given several different compounds? (Like homework problem 12.49)
by haleyervin7
Thu Dec 06, 2018 6:47 pm
Forum: Identifying Acidic & Basic Salts
Topic: equilibrium constant
Replies: 2
Views: 36

Re: equilibrium constant

On one of the homework questions it asked to explain which compound was a stronger base, an it used the equilibrium constant as the justification for the answer. Does this mean there won't be a question like this on the final?
by haleyervin7
Thu Nov 29, 2018 10:33 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Isoelectronic
Replies: 14
Views: 398

Re: Isoelectronic

How does being isoelectric affect polarizability?
by haleyervin7
Thu Nov 29, 2018 10:31 pm
Forum: Biological Examples
Topic: Myoglobin vs Hemoglobin
Replies: 2
Views: 35

Myoglobin vs Hemoglobin

Since myoglobin only has one spot available, which iron binds to, how does it bind to other myoglobins to form hemoglobin?
by haleyervin7
Thu Nov 29, 2018 10:28 pm
Forum: Naming
Topic: Ligand
Replies: 4
Views: 57

Re: Ligand

Will we be expected to memorize the names of several ligands according to the naming convention?
by haleyervin7
Thu Nov 29, 2018 10:27 pm
Forum: Dipole Moments
Topic: Cis vs trans
Replies: 2
Views: 35

Cis vs trans

When we are told to draw a Lewis structure that could either be cis or trans, and we are asked to determine if it is polar, doesn’t this depend on how we drew the molecule? Is there a convention that favors cis or trans when drawing Lewis structures that would help us determine if a molecule is pola...
by haleyervin7
Thu Nov 29, 2018 10:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 5
Views: 58

Re: Polarizability

When anions or cations are isoelectric, how do we determine which has higher polarizability/polarizing power?
by haleyervin7
Thu Nov 29, 2018 10:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition 4.23
Replies: 3
Views: 26

Re: 6th edition 4.23

I also had a question on this problem. On the Lewis structures for part b and c, why is there not a double bond for the oxygens?
by haleyervin7
Thu Nov 15, 2018 1:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Will we have to calculate bond angles?
Replies: 8
Views: 88

Re: Will we have to calculate bond angles?

I think as long as you remember the general angles (like 109.5) then you can say how other shapes are affected by the relative repulsion strength of lone pair-lone pair, lone pair-bonding pair, and bonding pair-bonding pair.
by haleyervin7
Thu Nov 15, 2018 12:59 pm
Forum: Hybridization
Topic: How to Determine
Replies: 12
Views: 258

Re: How to Determine

How does hybridization affect molecular shape? Does this have to do with resonance?
by haleyervin7
Thu Nov 15, 2018 12:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle
Replies: 4
Views: 55

Re: bond angle

When we are asked to estimate bond angles, such as when a lone pair causes distortion and the angle to be “slightly less than 109.5” for example, how will we know how much less it is? Will we ever be asked this on a test?
by haleyervin7
Thu Nov 08, 2018 7:51 pm
Forum: Bond Lengths & Energies
Topic: Tests
Replies: 5
Views: 91

Re: Tests

The week of the 19th is Thanksgiving. I think you mean the week of Nov 26th.
by haleyervin7
Thu Nov 08, 2018 7:49 pm
Forum: Sigma & Pi Bonds
Topic: Easy way of remembering the difference
Replies: 6
Views: 99

Re: Easy way of remembering the difference

Do sigma and pi bonds occur in both ionic and covalent bonds or just covalent?
by haleyervin7
Thu Nov 08, 2018 7:47 pm
Forum: Electronegativity
Topic: Trend Exceptions
Replies: 5
Views: 95

Re: Trend Exceptions

When looking at trends, what makes more of a difference, whether an element is further to the left or right or does up and down matter more?
by haleyervin7
Thu Nov 01, 2018 2:13 pm
Forum: Resonance Structures
Topic: Definition of resonance
Replies: 7
Views: 83

Re: Definition of resonance

When we draw all the resonant structures, is that just a model for how the bond is actually somewhere between a single and double, or are there actually that many different structures?
by haleyervin7
Thu Nov 01, 2018 2:06 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 14
Views: 232

Re: Drawing Lewis Structures

When drawing Lewis structures that aren’t symmetrical, like ONF, does it matter which side the O or F go on?
by haleyervin7
Thu Nov 01, 2018 2:03 pm
Forum: Lewis Structures
Topic: central atoms
Replies: 8
Views: 119

Re: central atoms

There is an exception with hydrogen because it will never be the central atom
by haleyervin7
Thu Oct 25, 2018 6:10 pm
Forum: Trends in The Periodic Table
Topic: Atomic, Covalent, and Ionic Radius
Replies: 5
Views: 60

Re: Atomic, Covalent, and Ionic Radius

How will we know if something is ionically or covalently bonded?
by haleyervin7
Thu Oct 25, 2018 6:06 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 14
Views: 243

Re: E=hv

When it says we should be able to calculate the number of photons from this equation, we must have the total energy before we can do that, right?
by haleyervin7
Thu Oct 25, 2018 6:00 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty of an Electron's Velocity & Speed of Light
Replies: 4
Views: 132

Re: Uncertainty of an Electron's Velocity & Speed of Light

How close to the speed of light is "too close" for it to be considered realistic?
by haleyervin7
Thu Oct 18, 2018 1:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: ground state electron configuration
Replies: 3
Views: 64

Re: ground state electron configuration

I also have a question on this, how do you know how many electrons are on each orbital? Is this something that is constant between elements (i.e. the 1s orbital always has two) or does it vary from element to element?
by haleyervin7
Thu Oct 18, 2018 1:46 pm
Forum: Trends in The Periodic Table
Topic: Period Table 'blocks'
Replies: 5
Views: 43

Period Table 'blocks'

What exactly does it mean when an element is in the "p-block" or "s-block", etc?
by haleyervin7
Thu Oct 18, 2018 1:45 pm
Forum: Einstein Equation
Topic: Photons and E=hv
Replies: 5
Views: 154

Photons and E=hv

What is the relationship between number of photons and energy in the equation E=hv? Do you multiply E by number of photons?
by haleyervin7
Thu Oct 11, 2018 5:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: shells versus orbitals
Replies: 3
Views: 177

Re: shells versus orbitals

How do we know how many shells and orbitals there are for each atom?
by haleyervin7
Thu Oct 11, 2018 11:54 am
Forum: Quantum Numbers and The H-Atom
Topic: Balmer/Lyman... Series
Replies: 4
Views: 49

Balmer/Lyman... Series

Will we have to memorize any other series besides Balmer and Lyman?
by haleyervin7
Thu Oct 11, 2018 11:36 am
Forum: Properties of Light
Topic: Electromagnetic Spectrum
Replies: 2
Views: 39

Electromagnetic Spectrum

Is it a good idea/necessary to memorize the electromagnetic spectrum with each type's wavelength range?
by haleyervin7
Wed Oct 03, 2018 10:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Isotopes [ENDORSED]
Replies: 12
Views: 289

Re: Isotopes [ENDORSED]

What causes atoms to have a different number of neutrons?
by haleyervin7
Wed Oct 03, 2018 10:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem G5
Replies: 8
Views: 147

Problem G5

On problem G5, how do you solve part a and b where it is just asking about part of the compound?
by haleyervin7
Wed Oct 03, 2018 10:46 pm
Forum: SI Units, Unit Conversions
Topic: Naming Compounds
Replies: 9
Views: 162

Re: Naming Compounds

Hi, I had a similar question, except I was also wondering how you know the state of each compound when it is not given.
by haleyervin7
Wed Oct 03, 2018 10:41 pm
Forum: SI Units, Unit Conversions
Topic: Naming Compounds
Replies: 9
Views: 162

Re: Naming Compounds

Hi, I had a similar question, except I was also wondering how you know the state of each compound when it is not given.

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