## Search found 97 matches

Thu Mar 12, 2020 2:42 pm
Forum: *Enzyme Kinetics
Replies: 7
Views: 117

is this going to be important for the final?
Thu Mar 12, 2020 2:41 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 3
Views: 48

### Arrhenius equation

what is the Arrhenius equation and what is it used for?
Thu Mar 12, 2020 2:40 pm
Forum: General Rate Laws
Topic: Differential vs Integrated Rate Law
Replies: 2
Views: 43

### Re: Differential vs Integrated Rate Law

I know that the two equations can de derived from each other, but I was wondering about when each is used as well. I think the differential is simply a mathematically derived version of the rate law, and the integrated one is a mathematically integrated version of the rate law.
Thu Mar 12, 2020 2:35 pm
Forum: Administrative Questions and Class Announcements
Topic: ENDGAME Review Session
Replies: 71
Views: 2741

### Re: ENDGAME Review Session

I love you
Thu Mar 12, 2020 2:30 pm
Forum: Biological Examples
Topic: biological examples for final
Replies: 9
Views: 529

### Re: biological examples for final

do you think these are examples we should memorize or mores just be familiar with for the exam?
Thu Mar 12, 2020 2:28 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reaction profiles
Replies: 3
Views: 32

### reaction profiles

what is a reaction profile exactly?
Thu Mar 12, 2020 2:26 pm
Forum: First Order Reactions
Topic: Half Life Equations
Replies: 10
Views: 66

### Re: Half Life Equations

can someone explain their importance/use?
Thu Mar 12, 2020 2:24 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: intergrated rate law
Replies: 9
Views: 111

### Re: intergrated rate law

what do we use the integrated rate law for? and differential?
Thu Mar 12, 2020 2:23 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: meaning of slow/fast mechanism
Replies: 3
Views: 47

### Re: meaning of slow/fast mechanism

what does this mean in terms of how we go about solving these type of problems? in simple terms, why do I care if a mechanism is slow or fast at equilibrium or other stages?
Thu Mar 12, 2020 2:21 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysis
Replies: 11
Views: 77

### Re: Catalysis

does anyone know if catalysis applies to the reverse reaction as well? Like, would a catalyst also affect how quickly products can form back into reactants
Thu Mar 12, 2020 2:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 6.43 questions
Replies: 2
Views: 24

### 6.43 questions

can someone explain the justification behind each answer to this question? I don't understand exactly how to differentiate between standard E cell potential and just E cell potential
Thu Mar 12, 2020 2:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: liquid mercury
Replies: 3
Views: 44

### Re: liquid mercury

it is part of a reference electrode known as a calomel electrode (Hg2Cl2). basically, using liquid mercury as an electrode takes advantage of its redox reactions
Thu Mar 12, 2020 1:31 pm
Forum: General Rate Laws
Topic: Unique Reaction Rates [ENDORSED]
Replies: 33
Views: 77890

### Re: Unique Reaction Rates[ENDORSED]

so in problems like 7A.3, we just take the unique rate and multiply it by the stoichiometric coefficient to determine the rate of each reactant/product right? just clarifying here, since I'm not 100% confident on the concept of unique rates
Thu Mar 12, 2020 1:26 pm
Forum: Student Social/Study Group
Topic: Thoughtful Poetry Time
Replies: 3
Views: 167

### Re: Thoughtful Poetry Time

chemistry
chemistreye
chemistrwhy
Thu Feb 20, 2020 10:02 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 5
Views: 51

### Re: Oxidation Numbers

sorry to sort of make everyone reiterate, but is there a set of rules we can follow to know exactly what the oxidation number of a molecule is? I hear a lot of different strategies/things to check but no one seems to be certain. Thanks!
Thu Feb 20, 2020 9:58 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 6L.9 Part A
Replies: 1
Views: 52

### Re: 6L.9 Part A

I think we're just supposed to infer it
Thu Feb 20, 2020 9:48 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 4
Views: 49

### Re: oxidation numbers

a more negative number indicates a greater number of electrons (higher negativity), however with oxidation/reduction, you have to look at each element in the molecule's oxidation number to figure out if it is being reduced or oxidized because a more negative molecule doesn't necessarily mean its bee...
Sun Feb 16, 2020 11:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: ΔS for Irreversible Expansion
Replies: 3
Views: 57

### Re: ΔS for Irreversible Expansion

my TA mentioned that you use the same equation, only a derived version that involves heat capacity. I know that's not very descriptive sorry I don't have my notes on me right now :/
Sun Feb 16, 2020 11:03 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: standard entropies vs. entropies
Replies: 5
Views: 122

### standard entropies vs. entropies

I'm still confused about what the difference is between standard entropy and just finding entropy or change in entropy, can someone explain it?
Sun Feb 16, 2020 8:58 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 12
Views: 82

### Re: Redox Reactions

oxidation is the loss of electrons by a molecule and reduction is the gain of electrons
Sun Feb 16, 2020 8:49 pm
Forum: Balancing Redox Reactions
Topic: 6K3. part d
Replies: 1
Views: 43

### Re: 6K3. part d

I think the HCl is being reduced and the Cl2 is being oxidized but I'm really not sure
Sun Feb 16, 2020 8:48 pm
Forum: Calculating Work of Expansion
Topic: Using Calculus to prove the equation
Replies: 4
Views: 121

### Re: Using Calculus to prove the equation

I think you're supposed to use the integral equation with the change in volume from V2 to V1 and the external pressure as a constant on the outside.
Sun Feb 16, 2020 8:44 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 12
Views: 82

### Re: Redox Reactions

a redox reaction is a combination of a reduction reaction and an oxidation reaction
Sun Feb 09, 2020 12:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: solids and liquids in the rxn quotient
Replies: 8
Views: 109

### solids and liquids in the rxn quotient

When calculating Q, do we exclude solids and liquids as when we calculate K? (I'm mostly referring to problem two on the Pizza Rolls review packet)
Sun Feb 09, 2020 12:05 pm
Forum: Phase Changes & Related Calculations
Replies: 6
Views: 61

I would also like to know
Sun Feb 09, 2020 12:04 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: constant p/v
Replies: 1
Views: 31

### Re: constant p/v

for constant pressure, you can use ∆H=q, or ∆U=q+w, or q=nCp*∆T where C is heat capacity with constant volume
for constant volume, you can use q=nCv*∆T, where C is heat capacity with constant volume

don't know if this helped but hopefully you got something!
Wed Feb 05, 2020 8:00 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 4F.1a
Replies: 4
Views: 49

### Re: 4F.1a

can someone explain to me how the answer to this problem (0.341 J/Kxs) is positive even though the equation you use to solve it is -(rate of heat generation)/temperature = -100/293???
Wed Jan 29, 2020 9:16 pm
Forum: Calculating Work of Expansion
Topic: 4A.5
Replies: 3
Views: 37

### 4A.5

4A.5 asks: A piston confines 0.200 mol Ne(g) in 1.20 L at 25 8C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to the same final volume. Which process ...
Wed Jan 29, 2020 6:30 pm
Forum: Calculating Work of Expansion
Topic: Systems of Equilibrium Practice
Replies: 2
Views: 44

### Re: Systems of Equilibrium Practice

I mean, any question that asks to calculate the work can technically use the integral work equation since it's where the -pdV comes from, so so far I've found that 4A.3 and 4A.5 help to practice!
Wed Jan 29, 2020 6:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Increasing energy in an open system
Replies: 7
Views: 47

### Re: Increasing energy in an open system

ALSO I know that 4.2 is not homework, but I would still like to know
Wed Jan 29, 2020 6:24 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Increasing energy in an open system
Replies: 7
Views: 47

### Re: Increasing energy in an open system

and if not, what are some ways to increase energy in an open system? because I'm lost
Wed Jan 29, 2020 6:24 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Increasing energy in an open system
Replies: 7
Views: 47

### Increasing energy in an open system

4A.2 asks to name three ways you can increase energy in an open system and I know one is to add or remove the amount of substance in the system, but I'm wondering if the other ways to affect a system that he discussed in lecture apply to open systems? Like, could heating or cooling an open system in...
Sun Jan 26, 2020 8:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Meaning of State Function
Replies: 8
Views: 63

### Re: Meaning of State Function

a state function just means that it's the STATE of the sample, whatever it is, that matters
Sun Jan 26, 2020 8:26 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A 1 Part c)
Replies: 5
Views: 78

### Re: 4A 1 Part c)

I didnt understand this either but according to google, "A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction. Bomb calorimeters have to withstand the large pressure within the calorimeter as the reaction is being measured...
Sun Jan 26, 2020 8:24 pm
Forum: Phase Changes & Related Calculations
Topic: Heat vs temperature
Replies: 6
Views: 82

### Re: Heat vs temperature

so just to clarify, the environment that the reaction is occurring in stays the same temperature despite the sample changing phases?
Sun Jan 26, 2020 8:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 4
Views: 29

### Re: Hess's Law

which method is the most accurate?
Sun Jan 26, 2020 8:20 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Reaction Enthalpy Use
Replies: 1
Views: 17

### Re: Standard Reaction Enthalpy Use

I have also been wondering about this same thing, but the best answer I can think of through reasoning is that it's accurate because it's being used as a standard so if one uses the standard reactions it will give a sturdy answer since they are all on the same page
Sun Jan 26, 2020 8:19 pm
Forum: Bronsted Acids & Bases
Topic: Book example 6A.2
Replies: 1
Views: 93

### Re: Book example 6A.2

that symbol indicates the "difference between"
Sun Jan 26, 2020 8:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Water Phase Change
Replies: 6
Views: 58

### Re: Water Phase Change

I think gases have more energy because the molecules move faster and do not have a defined space they take up
Thu Jan 16, 2020 11:28 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure (5J.1)
Replies: 3
Views: 13

### Re: Partial Pressure (5J.1)

I have another similar question with 5J.3 - can someone explain why adding/removing a certain amount of a compound might affect its equilbrium?
Thu Jan 16, 2020 11:25 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure (5J.1)
Replies: 3
Views: 13

### Partial Pressure (5J.1)

In 5J.1, it asks "Consider the equilibrium CO(g) 1 H2O(g) ∆CO2(g) 1 H2(g). (a) If the partial pressure of CO2 is increased, what happens to the partial pressure of H2? (b) If the partial pressure of CO is decreased, what happens to the partial pressure of CO2? (c) If the concentration of CO is ...
Fri Jan 10, 2020 8:07 pm
Forum: Ideal Gases
Topic: ICE table
Replies: 7
Views: 405

### Re: ICE table

Sorry if this is a stupid question, but when/why do we use ICE table?
Fri Jan 10, 2020 8:06 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: When to use Le Chatelier's
Replies: 4
Views: 41

### When to use Le Chatelier's

I was just wondering when we apply Le Chatelier's Principle ?
Fri Jan 10, 2020 8:04 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating the Equilibrium Quotient
Replies: 3
Views: 71

### Calculating the Equilibrium Quotient

Can someone explain to me what exactly the equilibrium quotient means and how to calculate it? thanks!
Sat Dec 07, 2019 1:55 am
Forum: Naming
Topic: Easy Way to Name/Remember
Replies: 2
Views: 55

### Re: Easy Way to Name/Remember

Name the ligands and then the central metal cation in one word. The ligands should be in alphabetical order, ignoring the prefixes, and the central metal cation should be last with its oxidation state. If there is a cation in front of the brackets that bonds to the coordination compound, name the e...
Sat Dec 07, 2019 1:40 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength of CH3 e- withdrawing power
Replies: 1
Views: 57

### Re: Strength of CH3 e- withdrawing power

I'm not sure, but it might be due to the slight negative charge that C would have in the CH3 molecule, causing H to be attracted more to that central atom and H+ being alone only wants electrons so it has greater withdrawing power
Sat Dec 07, 2019 1:35 am
Forum: Lewis Acids & Bases
Topic: Small, Highly Charged Metal Cations in Water
Replies: 2
Views: 40

### Re: Small, Highly Charged Metal Cations in Water

I think it's because the cations want to accept electron pairs in order to eventually a achieve a charge of 0 which would make it most stable. An electron accepting molecule is the definition of a Lewis acid
Sat Dec 07, 2019 1:31 am
Forum: Bronsted Acids & Bases
Topic: Stability and electronegativity
Replies: 1
Views: 40

### Re: Stability and electronegativity

A higher electronegativity allows for delocalizing of charge of lone pairs, so it makes the molecule generally more stable.
Sat Dec 07, 2019 1:31 am
Forum: Lewis Acids & Bases
Topic: List of Strong Acids and Bases
Replies: 2
Views: 65

### Re: List of Strong Acids and Bases

You can find many lists online, and there are also quizlets of them. But I think the main ones we need to know are listed below:
Acids: H2SO4,HBr,HCl,HNO3,HI,HClO3,HClO4
Bases: groups 1 and 2 oxides and group 2 hydroxides
Sat Dec 07, 2019 1:29 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Identifying Acids and Bases
Replies: 2
Views: 111

### Re: Identifying Acids and Bases

If you want to calculate the dissociation constants of the acids/bases then I guess you wouldn't have to memorize which are the strong ones, but considering there are only about six strong acids and the bases follow the trend of groups 1 and 2 on the periodic table, memorization might make your life...
Sat Dec 07, 2019 1:25 am
Forum: Hybridization
Topic: Pi bond
Replies: 10
Views: 210

### Re: Pi bond

Yes!
Pi bonds must exist between overlapping p-orbitals
Sat Dec 07, 2019 1:24 am
Forum: Naming
Topic: Easy Way to Name/Remember
Replies: 2
Views: 55

### Easy Way to Name/Remember

Does anyone have any tips/tricks for memorizing how to name coordination compounds? Or could someone quickly summarize all the rules and aspects we have to note when naming?
Sat Dec 07, 2019 1:15 am
Forum: Air Pollution & Acid Rain
Topic: Acid Rain textbook
Replies: 1
Views: 127

### Re: Acid Rain textbook

H.13, Focus 3 3.69, Example 5G.2, Box 6E.1, all mention acid rain/have practice problems for acid rain
Sat Dec 07, 2019 1:12 am
Forum: Lewis Acids & Bases
Topic: memorizing ligands
Replies: 5
Views: 183

### Re: memorizing ligands

I don't have a mnemonic for memorizing them but the table from Lavelle's course website is really nice to study with/make flashcards from! There's also a few quizlets that have good games/quizzes to help you memorize them faster
Sat Dec 07, 2019 1:11 am
Forum: Lewis Acids & Bases
Topic: Problem J.9
Replies: 2
Views: 64

### Re: Problem J.9

I've been wondering the same thing and I'd say it's safe to know the formula for different molecules based on the name since nomenclature was a section covered early on in the textbook for fundamentals, however, on past exams the formulas have been given
Sat Dec 07, 2019 1:10 am
Forum: Bronsted Acids & Bases
Topic: 6A7) A. HClO3
Replies: 1
Views: 42

### Re: 6A7) A. HClO3

The H is attached to one of the O atoms instead of Cl because it forms the hydroxide group at the end of the molecule which creates the most stable structure.
Sat Dec 07, 2019 1:06 am
Forum: Dipole Moments
Topic: Lone pairs
Replies: 5
Views: 144

### Re: Lone pairs

usually, lone pairs will create some sort of dipole moment because lone pairs cause greater electron repulsion, resulting in uneven charges in the molecule. But if you're unsure, I'd draw the Lewis Structure to see exactly how the lone pairs line up
Sat Dec 07, 2019 1:04 am
Forum: Biological Examples
Topic: Main examples
Replies: 2
Views: 56

### Re: Main examples

I'm not sure exactly what you mean by "main examples" but the Marshmallow review sheet that was posted by some UAs has a lot of practice problems for most of the topics that are supposed to be covered on the final.
Sat Dec 07, 2019 1:03 am
Forum: Naming
Topic: Isocyanido
Replies: 2
Views: 48

### Re: Isocyanido

I think it depends on the order of the atoms, as it does with the anions. For example, CN- is cyano but NC- is isocyano.
Sat Dec 07, 2019 1:01 am
Forum: Octet Exceptions
Topic: Valence electrons for expanded octets
Replies: 1
Views: 117

### Re: Valence electrons for expanded octets

I don't believe there is a limit, per se, but I don't think we'll be dealing with any molecules/compounds with an expanded octet that has more than like 12 valence electrons
Sat Dec 07, 2019 1:00 am
Forum: Biological Examples
Topic: overall stability constant
Replies: 1
Views: 38

### Re: overall stability constant

The numerical value comes from the concentration of those values. So it's the concentration of the products divided by the concentration of the reactants. Those values can be calculated depending on what you are given in the specific problem.
Sat Dec 07, 2019 12:58 am
Forum: Bronsted Acids & Bases
Topic: 6C.17
Replies: 1
Views: 41

### Re: 6C.17

Basically, the easier the acid/base dissociates, or ionizes, the stronger it is. One way to find this is to calculate the dissocation constant.
Sat Dec 07, 2019 12:53 am
Forum: Bronsted Acids & Bases
Topic: TM cation acting as Lewis acids
Replies: 1
Views: 52

### Re: TM cation acting as Lewis acids

I believe it only occurs in order to make the overall charge of the molecule neutral and not with every hydrated transition metal cation
Sat Nov 23, 2019 10:11 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dentate
Replies: 2
Views: 40

### Re: Dentate

Do you mean a polydentate?
Sat Nov 23, 2019 10:10 pm
Forum: Naming
Topic: Toolbox 9C.1
Replies: 2
Views: 34

### Re: Toolbox 9C.1

The -ate is because it is an anion
Sat Nov 23, 2019 10:09 pm
Forum: Resonance Structures
Topic: Bond Length/Delocalized Electrons
Replies: 2
Views: 132

### Re: Bond Length/Delocalized Electrons

I'm not positive but in short, yes.The delocalized electron means the bond length is unaffected.
Sun Nov 17, 2019 1:12 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: Dipole Moments
Replies: 3
Views: 27

### Re: Dipole Moments

I was also wondering this because I know sometimes they will point away from each other and it's nonpolar, but in other molecules it will be polar. I think if a molecule has dipole moments that aren't all pointing the same way, they do not cancel. But, if they all point the same way, they cancel.
Sun Nov 17, 2019 1:09 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 Bonds
Replies: 3
Views: 50

### Hydrogen Bonds

Are hydrogen bonds the strongest IMF? I'm pretty sure they are but I don't 100% understand why?
Sun Nov 17, 2019 1:06 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: Boiling Points
Replies: 9
Views: 123

### Re: Boiling Points

Matt F wrote:Is this the same for melting points? So stronger IMF's also lead to higher melting points?

yes I believe IMF's also lead to higher melting points
Sun Nov 17, 2019 1:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion Strength
Replies: 4
Views: 41

### Re: Repulsion Strength

Lone pair-lone pair repulsion is the strongest kind of repulsion and I think what you're referring to as just lone pair repulsion is actually lone pair-atom repulsion which is the second strongest repulsion.
Sun Nov 17, 2019 1:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity 2E.25
Replies: 2
Views: 38

### Polarity 2E.25

How come CO2 is non polar and the dipole moments point away from each other but CH2Cl2 is polar and the dipole moments point away from each other too? Do all dipole moments have to be facing the same way in order for dipole moments to cancel completely?
Sun Nov 03, 2019 10:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 7
Views: 108

### Re: formal charge

So just to clarify, we only have to find the formal charge when it asks us to? Or should we always draw lewis structures using formal charge?
Sun Nov 03, 2019 10:55 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ionic Character in Covalent Molecules and Vice-Versa
Replies: 2
Views: 73

### Re: Ionic Character in Covalent Molecules and Vice-Versa

To decide whether a bond is ionic or covalent, you look at the difference in electronegativity. If the difference is greater than 2 the bond is covalent and if its 1.5 or less its ionic.
Sun Nov 03, 2019 10:52 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Acids and Bases
Replies: 2
Views: 36

### Re: Lewis Acids and Bases

I was confused as to whether we have to know this for the midterm or not? He said we cover acids and bases later on in the quarter but we still did this in lecture last week so is this on the midterm?
Sun Nov 03, 2019 10:51 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Properties
Replies: 2
Views: 40

### Re: Ionic and Covalent Properties

I know he covered this in lecture but I found it a bit confusing. What happens when the difference is between 1.5 and 2?
Sun Nov 03, 2019 10:50 pm
Forum: Ionic & Covalent Bonds
Topic: polarizability
Replies: 2
Views: 49

### Re: polarizability

What is polarizability and how do we find it?
Sun Nov 03, 2019 10:48 pm
Forum: Lewis Structures
Topic: 2C.7
Replies: 1
Views: 21

### 2C.7

The question asks to draw the Lewis Structure of ICl5. I'm not sure if I'm supposed to put five Chlorines around the Iodine or if two of the Chlorines are bonded. Please help!
Sun Nov 03, 2019 10:36 pm
Forum: Administrative Questions and Class Announcements
Topic: slides
Replies: 4
Views: 77

### Re: slides

He does not post slides :(
Sun Nov 03, 2019 10:36 pm
Forum: Resonance Structures
Topic: Including resonance structures
Replies: 2
Views: 42

### Re: Including resonance structures

I'm pretty sure you only have to draw the resonance structures when it asks you to
Sun Oct 27, 2019 1:44 pm
Forum: Ionic & Covalent Bonds
Replies: 4
Views: 56

I'm wondering what the difference is between ionic and atomic radii. Do only ions have ionic radii? Or do all atoms have it? When I'm finding either, it seems like I'm just looking for how many electrons an element or ion has, because that would determine the size of the radius of the atom. Is that ...
Sun Oct 27, 2019 1:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Special Cases
Replies: 6
Views: 155

### Re: Electron Configuration Special Cases

I believe that whole period carries the exception for electron configurations, but I'm not 100% sure.
Sun Oct 27, 2019 1:34 pm
Forum: Lewis Structures
Topic: Homework for week 5
Replies: 1
Views: 19

### Re: Homework for week 5

if that is what your TA assigned. I was told that both Quantum World and Chemical Bonds problems were okay.
Sun Oct 27, 2019 1:31 pm
Forum: Ionic & Covalent Bonds
Topic: Writing Electron Configurations for an Ion
Replies: 6
Views: 77

### Re: Writing Electron Configurations for an Ion

I'm not too confident on this topic either, but I'm pretty sure you remove or add an electron to the highest energy level depending on whether you want a cation or anion. For example, to change Zinc from its ground-state to Zn+, you take the ground state configuration [Ar]3d^104s^2 and remove an ele...
Sun Oct 27, 2019 1:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Helpp
Replies: 2
Views: 38

### Re: HW Helpp

Principal quantum numbers is the n values or shell, which determines energy and size. The angular momentum refers to the l values or shape. For example, the s-orbital is l=0, p-orbital is l=1, d-orbital l=2, and f-orbital l=3.
Hopefully this helps get the problem started!
Sun Oct 27, 2019 1:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.3
Replies: 2
Views: 41

### Re: 2A.3

thanks!!
Sun Oct 27, 2019 1:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.13. p-orbital electron removal
Replies: 1
Views: 34

### 2A.13. p-orbital electron removal

2A.13 For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will need to be removed to form the 11 ions: (a) Zn; (b) Cl; (c) Al; (d) Cu. I believe the answer for Cl is that electron is removed from the 3p orbital so it becomes [Ne]3s2...
Sun Oct 27, 2019 12:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.3
Replies: 2
Views: 41

### 2A.3

2A.3 Give the ground-state electron configuration expected for each of the following ions: (a) S2-; (b) As3+; (c) Ru3+; (d) Ge2+.

On the syllabus it says to skip c, but can anyone tell me how to do it?
Sun Oct 20, 2019 3:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.11
Replies: 2
Views: 26

### 1E.11

Can someone help me with these configurations? I get confused about ground vs excited states in electrons.

1E.11 Write the ground-state electron configuration for each of the following atoms: (a) sodium; (b) silicon; (c) chlorine; (d) rubidium.

Thanks!
Sun Oct 20, 2019 11:31 am
Forum: Properties of Electrons
Topic: d vs s orbitals
Replies: 6
Views: 86

### Re: d vs s orbitals

Which elements are considered exceptions/how do we know if an element is an exception?
Sun Oct 20, 2019 11:24 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron States
Replies: 3
Views: 53

### Re: Electron States

How do we know if an electron is in a ground state or an excited state? I'm still a bit confused on this topic
Sun Oct 20, 2019 11:22 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Allowed Values of Quantum Numbers
Replies: 1
Views: 48

### Allowed Values of Quantum Numbers

So I understand that l values are based on n and ml values are based on l values, but my question is, how do we know which value of l that ml equals? For example, if l is 3, the allowed values for ml are -3, -2, -1, 0, 1, 2, 3. But how do we know which of those values actually IS the orientation of ...
Sun Oct 13, 2019 11:24 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 8
Views: 141

### Re: Schrodinger's Equation

What exactly is quantum mechanics? I don't understand what it applies to
Sun Oct 13, 2019 11:20 pm
Forum: DeBroglie Equation
Topic: DeBroglie's Equation
Replies: 1
Views: 56

### Re: DeBroglie's Equation

Light has no mass. Since photons have momentum, p, the equation can be applied to photons, but DeBroglie's is meant for electrons or specifically particles that have rest mass.
Sun Oct 13, 2019 3:17 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie Equation
Replies: 16
Views: 286

### Re: When to use DeBroglie Equation

As stated in the previous replies, the DeBroglie equation can only be used for objects that have rest mass, which does not apply to light. The equations λν = c or the E = hν are applicable to light. Is light the only thing without rest mass? And I'm also confused as to how rest mass apply to electr...
Mon Oct 07, 2019 9:16 pm
Forum: Balancing Chemical Reactions
Topic: Writing an Equation for the Reaction
Replies: 9
Views: 2360

### Re: Writing an Equation for the Reaction

I was wondering if anyone could help me solve this one, I honestly have no idea where to start. (Just to repeat it) M.7 Solid boron can be extracted from solid boron oxide by reaction with magnesium metal at a high temperature. A second product is solid magnesium oxide. (a) Write a balanced equation...
Sun Oct 06, 2019 10:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: G #17 b
Replies: 4
Views: 1392

### Re: G #17 b

Hey Yuchien, I solved this problem using dimensional analysis. First, I found the amount of moles of CuSO4 in 250 mL of a 0.20 solution, which is 0.05 moles of CuSO4. Then, we have to convert that into moles CuSO4.5H20 with a conversion factor of 1 mole CuSO4 for every 1 mol of CuSO4.5H20, which al...
Sun Oct 06, 2019 4:44 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Finding number of atoms, formula units and moles
Replies: 4
Views: 20792

### Re: Finding number of atoms, formula units and moles

The formula of Magnesium Sulfate Heptahydrate is MgSO 4 \cdot 7H 2 0 (Magnesium ion has a +2 charge, Sulfate has a -2 charge and heptahydrate is 7H 2 O since the prefix hepta indicates 7) a) We first start by finding the formula mass of the magnesium sulfate heptahydrate which is 246.48 g/mol To fi...