## Search found 100 matches

Wed Mar 11, 2020 8:06 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 5
Views: 119

### Final

For the take home final, will we have to take it during the time slot the closed book final would have been or could we take it any time in the next week?
Mon Mar 09, 2020 3:54 pm
Forum: General Rate Laws
Topic: Textbook question 7A.17
Replies: 3
Views: 61

### Re: Textbook question 7A.17

I believe that they just converted the units differently in the answer key
Mon Mar 09, 2020 3:53 pm
Forum: First Order Reactions
Topic: Textbook question 7B.3
Replies: 5
Views: 95

### Re: Textbook question 7B.3

Thank you! I was wondering this also and I see the relation in why you would subtract.
Mon Mar 09, 2020 3:50 pm
Forum: General Rate Laws
Topic: molecularity
Replies: 8
Views: 115

### Re: molecularity

Is molecularity then just the amount of reactants that interact?
Mon Mar 09, 2020 3:49 pm
Forum: Van't Hoff Equation
Topic: Van’t Hoff Equation
Replies: 11
Views: 200

### Re: Van’t Hoff Equation

Should we also know to derive it?
Mon Mar 09, 2020 3:48 pm
Forum: General Rate Laws
Topic: overall order
Replies: 5
Views: 46

### Re: overall order

You just add up the individual orders. So if you have A + B --> C and reactant A is order 1 and reactant B is order 2, the overall order would be 3
Mon Mar 09, 2020 3:47 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst vs Intermediate
Replies: 6
Views: 65364

### Re: Catalyst vs Intermediate

So catalysts are in the reactants then products side. And intermediates are in the product then reactant side?
Mon Mar 02, 2020 10:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: HW 14.85
Replies: 2
Views: 269

### Re: HW 14.85

So the higher the negative potential the more reducing power it has? This would make it oxidized though right?
Thu Feb 27, 2020 8:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.7
Replies: 2
Views: 24

### 6M.7

How you know which has the highest reducing power? Will we be given the gradient table to determine this? I know the the more negative the standard potential the more reducing power the metal has. But where are we getting these numbers from?
Thu Feb 27, 2020 7:57 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Where to find Ecell values
Replies: 15
Views: 140

### Re: Where to find Ecell values

Does anyone know when you would flip the sign in a half relation? I know that if you flip the equation the sign flips, but then do you not do this when calculating E(cell)? like if they give you the E value in the problem and the equation has to be flipped do you flip the sign?
Thu Feb 27, 2020 7:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: how to write a cell diagram [ENDORSED]
Replies: 7
Views: 968

### Re: how to write a cell diagram[ENDORSED]

Yeah for example for 6M.1, they give the half reactions and Cu^2+|Cu is written, but then in the full diagram it is written M(s)|M+(aq)||Cu^2+(aq)|Cu(s), and they say that the Cu^2+ is the anode, but how is that? On the full cell diagram it is on the right so is that not the cathode? This is the ful...
Thu Feb 27, 2020 7:50 pm
Forum: Balancing Redox Reactions
Topic: Determining which is cathode and which is anode using E
Replies: 3
Views: 38361

### Re: Determining which is cathode and which is anode using E

So for 6M.3 for example, how would I use this strategy here? Some of these half reactions are not on the equations sheet we were given on the test so how would we know. For example for part b, how do we know AgI is the anode and AgCl is the cathode? Im still confused on applying this concept.
Wed Feb 26, 2020 4:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrochemistry and reverse reactions
Replies: 3
Views: 24285

### Re: Electrochemistry and reverse reactions

This makes sense. I was wondering why in the equation we not change the sign. Thank you!
Tue Feb 25, 2020 8:35 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: n when calculating Gibbs Free Energy
Replies: 6
Views: 6143

### Re: n when calculating Gibbs Free Energy

Also, for part b of this question, how would you right out the reduction half reaction? I am confused on how to figure out what it is and how to write it out.
Tue Feb 25, 2020 8:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: n when calculating Gibbs Free Energy
Replies: 6
Views: 6143

### Re: n when calculating Gibbs Free Energy

Ohhh so in order to get n, you have to balance the half reactions and then subtract the electrons?
Tue Feb 25, 2020 6:58 pm
Forum: Van't Hoff Equation
Topic: HW 11.83
Replies: 4
Views: 627

### Re: HW 11.83

So why exactly is the delta G = delta H - T delta S needed just because there are two different temperatures?
Tue Feb 25, 2020 6:18 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.15
Replies: 12
Views: 998

### Re: 11.15

Also can you use Barr in calculating Q? I thought it had to be atm
Tue Feb 25, 2020 6:10 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: HW question 5G.15
Replies: 4
Views: 84

### Re: HW question 5G.15

I also don't know how to do this? Like how would we incorporate the pressures given into this? Do we use delta G = -RTlnK?
Tue Feb 25, 2020 6:09 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy and K
Replies: 5
Views: 93

### Re: Gibbs Free Energy and K

So for example question 5G.13 in the textbook, how would you find Gibbs free energy when given K, temperature, and there pressures of the products and reactants?
Tue Feb 25, 2020 6:01 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.15
Replies: 12
Views: 998

### Re: 11.15

Im also a bit confused as to why we are calculating Q again?
Tue Feb 25, 2020 5:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.15
Replies: 12
Views: 998

### Re: 11.15

How do you know delta G is 0 again?
Mon Feb 24, 2020 6:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration Cells
Replies: 5
Views: 55

### Re: Concentration Cells

I believe a salt bridge can be used and I think he showed a diagram in lecture on this in the concentration cell
Mon Feb 24, 2020 6:15 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Maximum Potential and Voltage
Replies: 6
Views: 70

### Re: Maximum Potential and Voltage

This makes sense thank you! I was also confused on this part but it makes sense that it is the voltage that is measured when the current is flowing.
Mon Feb 24, 2020 6:14 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Electrolytic Cells
Replies: 3
Views: 36

### Re: Electrolytic Cells

I believe in an electrolytic cell, a process called electrolysis takes place. The anode in this case is labeled + and the cathode -. Unlike a galvanic cell, a current must be supplied by an external electrical power source. This is how you would drive a process in a non spontaneous direction.
Mon Feb 24, 2020 6:12 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Derivation of Formula
Replies: 2
Views: 33

### Re: Derivation of Formula

As reactants are consumed in a working electrochemical cell, the cell potential will also decrease until it reaches zero. The Nernst equation is used to establish the relationship between how cell potential depends on concentration
Mon Feb 24, 2020 6:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic/voltaic cell
Replies: 6
Views: 59

### Re: Galvanic/voltaic cell

A galvanic cell is an electrochemical cell in which a spontaneous reaction is used to generate an electric current. So an example would be a battery
Fri Jan 31, 2020 6:12 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Ch 8 #53 Part b
Replies: 7
Views: 497

### Re: Ch 8 #53 Part b

So if the temperature goes up, the reaction is releasing energy and is negative?
Thu Jan 30, 2020 10:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4A.7
Replies: 2
Views: 37

### 4A.7

I am very confused on this question: (a) Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its tem- perature from 20.0 8C to the boiling point of water, 100.0 8C. (b) What percentage of the heat is used to raise the temperature of the wa...
Thu Jan 30, 2020 10:12 pm
Forum: Calculating Work of Expansion
Topic: Which process does more work?
Replies: 5
Views: 638

### Re: Which process does more work?

So for the first one, why does the volume remain 1.20L?
Thu Jan 30, 2020 9:52 pm
Forum: Phase Changes & Related Calculations
Topic: Calculating Work
Replies: 4
Views: 1883

### Re: Calculating Work

Thank you!! This really helped because I was having trouble figuring out the internal energy.
Mon Jan 20, 2020 2:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K value at a specific temp
Replies: 6
Views: 75

### Activity

What should we know about the activity of a reaction?
Mon Jan 20, 2020 2:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 6D.5 part d answer key error?
Replies: 2
Views: 27

### Re: Homework 6D.5 part d answer key error?

sorry there should be a division symbol between 1.09 x 10^-4 and .0073
Mon Jan 20, 2020 2:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 6D.5 part d answer key error?
Replies: 2
Views: 27

### Re: Homework 6D.5 part d answer key error?

On his website, under textbook errors 6D.5 is listed so you are good!
It says % protonation = (1.09 x 10^-4)(.0073) x 100% which should equal 1.5%.
Mon Jan 20, 2020 1:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6E.1
Replies: 2
Views: 25

### 6E.1

Why is the concentration of H3O+ in the equation 0.15? I know the first equation completely ionized, but that carries over?
Mon Jan 20, 2020 1:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Weak acids & bases
Replies: 7
Views: 58

### Re: Weak acids & bases

What would CH3NH3Cl dissociate to produce?
Mon Jan 20, 2020 1:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D.7
Replies: 3
Views: 39

### Re: 6D.7

The K wasn't given in the problem directly, are we supposed to look at some kind of table?
Mon Jan 20, 2020 1:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 5% Rule
Replies: 6
Views: 84

### Re: 5% Rule

Is it that it is 5% of less than 5% OF the initial concentration?
Mon Jan 20, 2020 1:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH sig figs
Replies: 9
Views: 72

### pH sig figs

How do you determine how many significant figures to write when determining pH?
Mon Jan 20, 2020 1:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D.15
Replies: 1
Views: 41

### 6D.15

In this homework problem, how would you write the chemical equilibrium equation for 0.055M AlCl3? In the solutions manual, it is written very differently than I've seen? Thanks!
Mon Jan 13, 2020 6:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Thermodynamic Stability
Replies: 6
Views: 64

### Re: Thermodynamic Stability

It will be more thermodynamically stable if it has a smaller K.
Mon Jan 13, 2020 6:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient
Replies: 11
Views: 81

### Re: Reaction Quotient

The reaction quotient , Q, is pretty much used and compared to K to determine the direction the reaction will proceed in. If Q<K, then products favored. If Q>K then the reactants favored.
Mon Jan 13, 2020 6:25 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 5
Views: 35

### Re: Le Chatelier's Principle

SO basically when a stress is applied to a system, the system will counteract those changes by favoring either the reverse or forward reaction.
Mon Jan 13, 2020 6:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A.21
Replies: 1
Views: 19

### 6A.21

How would we do part b? Im confused on the different temperature. DO the same rules apply?
Mon Jan 13, 2020 6:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B.3
Replies: 2
Views: 19

### 6B.3

Would someone be able to help me with 6B.3? How are we supposed to incorporate the different volumes to get pH?
Tue Jan 07, 2020 8:04 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Effect of High Initial Concentration of Reactant
Replies: 5
Views: 69

### Re: Effect of High Initial Concentration of Reactant

Yes if there is a higher concentration of reactants, then products will be favored according to Le Chatlier's Principle.
Tue Jan 07, 2020 8:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.11
Replies: 3
Views: 38

### Re: 5I.11

mmol is millimole so you would convert that into moles and then for concentration divided by liters.
Tue Jan 07, 2020 8:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q vs K
Replies: 13
Views: 152

### Re: Q vs K

Q refers to the direction that the reaction will proceed in. You use Q in comparison to K. For example, if Q<K, then the reaction favors reactant production. If Q>K then it favors products. If Q=K, then the reaction is at equilibrium.
Tue Jan 07, 2020 8:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Expression for K
Replies: 4
Views: 47

### Re: Expression for K

You would put P in front when there are gases involved in the reaction.
Tue Jan 07, 2020 4:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.11
Replies: 3
Views: 38

### 5I.11

For this homework problem, what are we supposed to do when the amounts are given in mmol to find the reaction quotient, Q?
Tue Jan 07, 2020 4:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.11
Replies: 3
Views: 57

### 5G.11

For this question, what do we do when there is a solid or liquid in the reaction? What if there is (aq)? I remember him saying something becomes 1.
Thu Dec 05, 2019 3:47 pm
Forum: Hybridization
Topic: hybridization
Replies: 3
Views: 46

### Re: hybridization

Merging of two atomic orbitals means that the orbitals overlap. So the greater the extent of the orbital overlap, the stronger the bond. A mixing of s, px, py, pz orbitals would create four hybridized orbitals = tetrahedral sp3.
Thu Dec 05, 2019 3:45 pm
Forum: Hybridization
Topic: Hybridization of N2
Replies: 3
Views: 19134

### Re: Hybridization of N2

How would you draw the hybridization orbitals for N2 to show the 2 pi bonds?
Tue Dec 03, 2019 11:22 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9
Replies: 5
Views: 56

### Re: 6B.9

I had a question on this too. In the textbook solutions, it says that the answer for (ii) is 1.50M for [OH-], the pH = 13.824, and the pOH = 0.176?
Tue Dec 03, 2019 11:19 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Which is the stronger acid?
Replies: 3
Views: 114

### Which is the stronger acid?

For HClO vs HClO2, how would you reason that HClO2 is the stronger acid? In the textbook it said it was based on the greater number of O atoms in HClO2, but why?

Thank you!
Tue Dec 03, 2019 11:17 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Stronger Acid 6C.21
Replies: 3
Views: 110

### Stronger Acid 6C.21

How do you know that formic acid is stronger than acetic acid? What would be the reasoning?
Mon Dec 02, 2019 10:10 pm
Forum: Lewis Acids & Bases
Topic: Acids and Bases 6A.13
Replies: 2
Views: 56

### Acids and Bases 6A.13

For 6A.13, how would you know if the ion is an acid or base?

For example, for F- and H-, how do you know F- is a Lewis base and H- is a Lewis base?
And why would BF3 be a Lewis acid?
Tue Nov 26, 2019 9:12 pm
Forum: Naming
Topic: Writing the formula given the compound
Replies: 4
Views: 805

### Re: Writing the formula given the compound

Ok got it thanks!
Tue Nov 26, 2019 9:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.37 Determine coordination number
Replies: 4
Views: 1359

### Re: 17.37 Determine coordination number

This really helped thanks! For EDTA do we just memorize that it is 6 as per the example in class? What would be the formula for it? Thanks.
Tue Nov 26, 2019 8:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 3
Views: 40

### Re: Chelate

A chelate is basically just a complex containing one or more ligands that forma ring of atoms including the central metal atom.

Chelate formation lies behind the body's strategy of producing fever when infected by bacteria for example.
Tue Nov 26, 2019 8:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.5
Replies: 1
Views: 37

### 9C.5

Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center: (a) HN(CH2CH2NH2)2; (b) CO322; (c) H2O; (d) oxalate. For this question, how exactly do you know if a ligand is p...
Tue Nov 26, 2019 7:59 pm
Forum: Naming
Topic: Homework Problem 16.29 Part D
Replies: 5
Views: 757

### Re: Homework Problem 16.29 Part D

So it is always the neutral atom first got it thank you! Also, for this same question why would there be a bis there?
Tue Nov 26, 2019 7:56 pm
Forum: Naming
Topic: Writing the formula given the compound
Replies: 4
Views: 805

### Re: Writing the formula given the compound

When would you put an overall charge on the coordination compound?
Thu Nov 14, 2019 10:15 pm
Forum: General Science Questions
Topic: Midterm
Replies: 7
Views: 134

### Re: Midterm

Great!
Thu Nov 14, 2019 10:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 11
Views: 109

### Re: Test 2

It should be on everything after the midterm up to Friday's lecture. So studying all the lecture notes and homework problems would be beneficial.
Thu Nov 14, 2019 10:12 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: hw problem 2D.11
Replies: 2
Views: 124

### Re: hw problem 2D.11

Thanks this helped me as well!
Thu Nov 14, 2019 10:12 pm
Forum: Dipole Moments
Topic: Dipole Moment to figure out polarity
Replies: 3
Views: 66

### Re: Dipole Moment to figure out polarity

Thu Nov 14, 2019 10:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E21
Replies: 2
Views: 36

### Re: 2E21

Thank you!
Thu Nov 14, 2019 10:10 pm
Forum: Hybridization
Topic: Pi and Sigma Bonds
Replies: 17
Views: 483

### Re: Pi and Sigma Bonds

I think it's good to know!
Thu Nov 14, 2019 10:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structures & VSEPR
Replies: 9
Views: 71

### Re: Lewis Structures & VSEPR

Drawing the lewis structure is helpful, but it is not required.
Thu Nov 14, 2019 10:08 pm
Forum: Dipole Moments
Topic: Test 2
Replies: 3
Views: 78

### Re: Test 2

It should be on all material covered after the midterm.
Thu Nov 14, 2019 10:06 pm
Forum: Dipole Moments
Topic: 3f.1
Replies: 3
Views: 62

### Re: 3f.1

dipole moments are based on partial positive and negative ends of a molecule. You can determine through the electronegativity differences in the molecule. Since O is more electronegative than S, O has a partial negative charge and S has a partial positive charge. There is a dipole moment within the ...
Thu Nov 14, 2019 10:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 269

### Re: Molecular Shape Name

It is helpful to remember the shape names as well as bond angles.
Mon Oct 28, 2019 2:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Multi-electron atoms
Replies: 6
Views: 81

### Re: Multi-electron atoms

Ok, makes sense!
Mon Oct 28, 2019 2:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge equation?
Replies: 5
Views: 68

### Re: Formal Charge equation?

The formal charge equation we were taught is

FC = V - (L + S/2)
where
FC = formal charge
V = valence e-
L = Long pair e-
S = shared e-
Mon Oct 28, 2019 2:11 pm
Forum: Ionic & Covalent Bonds
Topic: likely charge of atoms
Replies: 3
Views: 35

### Re: likely charge of atoms

This helped thank you!
Mon Oct 28, 2019 2:08 pm
Forum: Lewis Structures
Topic: Expanded Valence Shells
Replies: 3
Views: 55

### Re: Expanded Valence Shells

Expanded valence shells means that the element can accommodate more than 8 valence electrons (i.e P, S, Cl)
This is because atoms in Period 3 or higher have d-orbitals in valence shell that accommodate additional electrons.

The octet guideline : 8e- --> s^2 p^6
Mon Oct 28, 2019 2:06 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 3
Views: 54

### Re: Resonance

Resonance is basically the blending of structures. It is multiple bonds that can be in different locations. Electrons involved in resonance structures are delocalized. For example, Benzene, C6H6, has 3 localized double bonds (2 possible structures).
Tue Oct 22, 2019 12:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d orbital
Replies: 3
Views: 62

### Re: d orbital

Hi! Yes so the two exceptions are Cu and Cr. So in these cases the s level is actually higher than the d. So for Cu, the configuration would be [Ar] 4s^2 3d^9. However, it must be rewritten in numerical order: [Ar] 3d^9 4s^2. Now if we were to write the configuration of Cu^2+, the two electrons must...
Tue Oct 22, 2019 12:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: example in class
Replies: 6
Views: 82

### Re: example in class

Basically it is subscript x because since l=1, ml can = -1,0,1. Since they are specifying that ml=-1 that gives you the subscript x. If ml=0, the subscript would be y. If ml=1, the subscript would be z.
Tue Oct 22, 2019 12:16 pm
Forum: Trends in The Periodic Table
Replies: 10
Views: 150

Anions gained an electron, therefore the radius is larger than that of the parent atom. If an atom loses an electron, it is a cation, and has a smaller radius. Hope this helps! :)
Tue Oct 22, 2019 12:12 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals 1D.19
Replies: 3
Views: 81

### Orbitals 1D.19

1D.19 How many orbitals are present in the (a) 4p-subshell; (b) 3d-subshell; (c) 1s-subshell; (d) 4f-subshell of an atom?

How would I go about doing this?
Tue Oct 22, 2019 11:55 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 5
Views: 73

### Orbitals

When n=6, why are the possible values for l = 0,1,2,3,4,5,6? I thought it would just be 0-5, since it's n-1? I am trying to answer all parts of this question: (a) How many values of the quantum number l are possible when n = 6? (b) How many values of ml are allowed for an electron in a 5f-subshell? ...
Tue Oct 22, 2019 11:51 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals / Quantum Numbers
Replies: 3
Views: 43

### Orbitals / Quantum Numbers

How do we know that for orbital 6p for example, that the principle and angular momentum quantum numbers are n=6 and l = 1? I know that for l, the quantum numbers can be 0,1,2,3,4,5 right, but for orbital 6p, how is it just l=1?
Tue Oct 15, 2019 2:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What does "l" mean?
Replies: 2
Views: 74

### Re: What does "l" mean?

Thank you! This question really helped me as well.
Tue Oct 15, 2019 2:35 pm
Forum: Properties of Electrons
Topic: Using masses of protons, neutrons, and electrons
Replies: 7
Views: 136

### Re: Using masses of protons, neutrons, and electrons

It seems that we would probably be given these values or they would be found on some sort of reference table. But it also would not be a bad idea to know their general values.
Tue Oct 15, 2019 2:34 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 8
Views: 141

### Re: Schrodinger's Equation

Yeah I am unsure about when this equation would be used or calculations associated with it?
Tue Oct 15, 2019 2:33 pm
Forum: Einstein Equation
Topic: Meaning of h [ENDORSED]
Replies: 5
Views: 111

### Re: Meaning of h[ENDORSED]

h represents Plank's constant. So when you graph E vs the frequency of light, the slope of that line is Planck's constant.
Tue Oct 15, 2019 2:29 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 7
Views: 114

### Re: De Broglie Wavelength

So when it asks for the De Broglie Wavelength, you would find the wavelength through h=mvl or l = h/mv
Wed Oct 09, 2019 10:19 pm
Forum: Properties of Light
Topic: Work Function
Replies: 3
Views: 36

### Re: Work Function

Work function is basically the energy required to remove an electron from the metal surface. If the energy of the photon is not greater than or equal to the energy to remove an electron (work function), then no electrons will be emitted.
Wed Oct 09, 2019 10:18 pm
Forum: Photoelectric Effect
Topic: Energy of Photon = Work Function
Replies: 4
Views: 62

### Re: Energy of Photon = Work Function

Unless the E(Photon) is greater than or equal to the E(Energy to remove an electron), an electron will not be emitted even for HIGH INTENSITY light, which was quite unexpected in the photoelectric effect experiment. Light sources with long wavelength (low frequency) light does not eject electrons ev...
Wed Oct 09, 2019 10:15 pm
Forum: Properties of Light
Topic: Planck's constant
Replies: 2
Views: 45

### Re: Planck's constant

So when plotting the frequency of light vs Energy, the slope of that line produces the proportionality constant, or Planck's constant. Energy is proportional to hv.
Wed Oct 09, 2019 10:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Homework Problem A11
Replies: 4
Views: 62

### Re: Homework Problem A11

For the Lyman series, the lower energy level is n=1. For the Balmer series it is n=2.
Wed Oct 09, 2019 10:11 pm
Forum: Quantum Numbers and The H-Atom
Topic: Frequency
Replies: 15
Views: 254

### Re: Frequency

Frequency is proportional to the Energy. So, as the frequency (Hz) increases, so does the Energy (J).
Tue Oct 01, 2019 10:31 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 3
Views: 91

### Re: Problem E. 25

So formula units just means atoms?
Tue Oct 01, 2019 10:29 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Practice Problem E.1
Replies: 6
Views: 80

### Re: Practice Problem E.1

Usually it is better to convert back to meters.
Tue Oct 01, 2019 10:25 pm
Forum: Molarity, Solutions, Dilutions
Topic: Mixtures and Solutions G.21
Replies: 2
Views: 41

### Re: Mixtures and Solutions G.21

Great, thank you! And then I would divide by the 0.5L correct? I got .0458M potassium ions and .009M sulfide ions.
Tue Oct 01, 2019 10:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 1047

### Re: Balancing Equations[ENDORSED]

All stoichiometric coefficients must be the lowest whole number, and multiplying by 2 would give the lowest whole number coefficients for that equation!
Tue Oct 01, 2019 10:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Practice Problem E.1
Replies: 6
Views: 80

### Re: Practice Problem E.1

You would get Avogadro's number, which is 6.022x10^23 atoms / mol then multiply by 288 ppm (which is the diameter), and then convert back to meters by dividing by 10^12 pm.
Tue Oct 01, 2019 10:08 pm
Forum: Limiting Reactant Calculations
Topic: 2 Limiting Reactants
Replies: 9
Views: 126

### Re: 2 Limiting Reactants

I don't believe that there can be more than one limiting reactant. In a reaction, there is ONE limiting reaction and the others are in excess. Once the limiting reactant is used up, the reaction can no longer occur, because the amount of product being produced is limited.
Tue Oct 01, 2019 10:04 pm
Forum: Molarity, Solutions, Dilutions
Topic: Mixtures and Solutions G.21
Replies: 2
Views: 41

### Mixtures and Solutions G.21

How would I start this problem?

A solution is prepared by dissolving 0.500 g of KCl, 0.500 g of K2S, and 0.500 g of K3PO4 in 500. mL of water. What is the concentration in the final solution of (a) potassium ions; (b) sulfide ions?