Search found 43 matches
- Sat Mar 17, 2018 10:50 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 14.83
- Replies: 1
- Views: 294
14.83
Does anyone know how to solve question 14.83?
- Sat Mar 17, 2018 10:49 am
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: 14.115
- Replies: 1
- Views: 395
14.115
Does anyone know how to solve question 14.115?
- Sat Mar 17, 2018 10:48 am
- Forum: Balancing Redox Reactions
- Topic: 14.119
- Replies: 1
- Views: 351
14.119
Does anyone know how to solve question 14.119?
- Sun Mar 11, 2018 12:16 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 9.99
- Replies: 1
- Views: 290
9.99
Does anyone know how to solve exercise 9.99?
- Sun Mar 11, 2018 12:15 pm
- Forum: Biological Examples
- Topic: 15.105
- Replies: 1
- Views: 797
15.105
Does anyone know how to solve exercise 15.105?
- Sun Mar 11, 2018 12:09 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 15.71
- Replies: 1
- Views: 302
15.71
Does anyone know how to solve exercise 15.71?
- Sun Mar 04, 2018 10:07 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.69
- Replies: 2
- Views: 342
15.69
Does anyone know how to solve question 15.69?
- Sun Mar 04, 2018 10:07 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 15.47
- Replies: 1
- Views: 294
15.47
Does anyone know how to solve question 15.47?
- Sun Mar 04, 2018 10:06 pm
- Forum: First Order Reactions
- Topic: 15.23
- Replies: 6
- Views: 847
15.23
Does anyone know how to solve question 15.23?
- Sun Feb 25, 2018 10:36 pm
- Forum: First Order Reactions
- Topic: 15.37
- Replies: 2
- Views: 386
15.37
Does anyone know how to solve exercise 15.37?
- Sun Feb 25, 2018 10:35 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.67
- Replies: 1
- Views: 282
15.67
Does anyone know how to solve exercise 15.67?
- Sun Feb 25, 2018 10:33 pm
- Forum: General Rate Laws
- Topic: 15.29
- Replies: 1
- Views: 297
15.29
Does anyone know how to solve exercise 15.29?
- Sun Feb 18, 2018 7:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum electrodes
- Replies: 4
- Views: 575
Platinum electrodes
When exactly are platinum electrodes used?
I assumed that it was whenever there wasn't a solid metal involved in the reaction; however there are some questions in the textbook where a platinum electrode is used even when a solid metal is present.
I assumed that it was whenever there wasn't a solid metal involved in the reaction; however there are some questions in the textbook where a platinum electrode is used even when a solid metal is present.
- Sun Feb 18, 2018 7:48 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Exercise 14.31
- Replies: 2
- Views: 400
Exercise 14.31
Does anyone know how to solve exercise 14.31?
- Sun Feb 18, 2018 7:46 pm
- Forum: Balancing Redox Reactions
- Topic: Exercise 14.17
- Replies: 6
- Views: 770
Exercise 14.17
Does anyone know how to solve exercise 14.17?
- Sun Feb 11, 2018 10:30 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Exercise 14.55 part b
- Replies: 1
- Views: 255
Exercise 14.55 part b
Does anyone know how to solve part b of exercise 14.55?
- Sun Feb 11, 2018 10:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Exercise 14.87
- Replies: 1
- Views: 241
Exercise 14.87
Does anyone know how to solve question 87 on the homework?
- Sun Feb 11, 2018 10:26 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Homework Q14.117
- Replies: 2
- Views: 412
Homework Q14.117
Does anyone know how to solve question 117 on the homework?
- Sun Feb 04, 2018 8:32 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Exercise 9.63
- Replies: 2
- Views: 388
Exercise 9.63
Does anyone know how to solve exercise 9.63 on the homework?
- Sun Feb 04, 2018 8:30 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Exercise 9.75
- Replies: 1
- Views: 258
Exercise 9.75
Does anyone know how to solve exercise 9.75 on the homework?
- Sun Feb 04, 2018 8:24 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous Reactions and Relation to Delta G°
- Replies: 1
- Views: 275
Re: Spontaneous Reactions and Relation to Delta G°
Delta G is negative for spontaneous reactions.
If you see the equation for delta G: delta G(system)=delta H(system)-T*delta S
The sign for delta G is the opposite for delta S of the system
And since delta S has to be positive for spontaneous, delta G is negative.
If you see the equation for delta G: delta G(system)=delta H(system)-T*delta S
The sign for delta G is the opposite for delta S of the system
And since delta S has to be positive for spontaneous, delta G is negative.
- Sun Jan 21, 2018 8:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Exercise 8.29
- Replies: 1
- Views: 278
Exercise 8.29
Does anyone know the explanation for 8.29 on the homework?
- Sun Jan 21, 2018 7:30 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.67
- Replies: 2
- Views: 255
8.67
Where exactly is the enthalpy of sublimation value for carbon used in this question?
- Sun Jan 21, 2018 7:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Exercise 8.19
- Replies: 1
- Views: 355
Exercise 8.19
Does anyone know how to solve exercise 8.19 from the textbook?
- Sun Jan 14, 2018 8:08 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Q 8.67
- Replies: 2
- Views: 306
Q 8.67
Does anyone know how to solve exercise 8.67 from the homework?
- Sun Jan 14, 2018 8:04 pm
- Forum: Phase Changes & Related Calculations
- Topic: kJ vs. kJ/mol
- Replies: 3
- Views: 1534
kJ vs. kJ/mol
When do we use kJ/mol for enthalpy? Is kJ only when moles aren't specified or whenever you're calculating the overall reaction enthalpy?
- Sun Dec 10, 2017 12:19 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric compounds
- Replies: 3
- Views: 1036
Re: Amphoteric compounds
I think it's just the oxides of all the metals in the list he gave us during the lecture: Be, Al, Ga, Sn, Sb and Pb.
- Sun Dec 10, 2017 12:15 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Significant figures in calculations
- Replies: 1
- Views: 371
Significant figures in calculations
When calculating concentrations, how many significant figures do we use in the answer? Is it the same number of figures as the Kc value?
- Sun Dec 03, 2017 9:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.117
- Replies: 2
- Views: 324
11.117
Does anyone know how to solve exercise 11.117 for the equilibrium chapter?
- Sun Dec 03, 2017 3:22 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Dentates
- Replies: 6
- Views: 920
Re: Dentates
Then do you count the number of lone pairs or just the number of atoms having lone pairs?
Like would H2O be monodentate or bidentate?
Like would H2O be monodentate or bidentate?
- Sun Nov 26, 2017 11:10 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Reaction constant
- Replies: 4
- Views: 776
Reaction constant
For a particular reaction, if it isn't specified whether the constant is Kc or Kp do we just assume that they mean Kc?
- Mon Nov 20, 2017 2:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Homework Q17.37
- Replies: 2
- Views: 432
Homework Q17.37
For part c and d of this question, the coordination number of the central metal depends upon the chelating compound. Are we required to know the chelating compounds and how many bonds they form, or will this information be given to us on the exam?
- Sun Nov 12, 2017 11:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Book Questions 4.1&4.2
- Replies: 4
- Views: 476
Re: Book Questions 4.1&4.2
I think it depends on the bond angles? For example, for part a on the first question, the molecule has a bond angle of 120, which should mean a trigonal planar, or basically 3 electron domains around the central atom. The diagram only shows 2 bonded pairs (which would otherwise be bond angle 180) so...
- Sun Nov 12, 2017 12:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles for molecules with lone pairs
- Replies: 1
- Views: 345
Bond angles for molecules with lone pairs
So there's a bunch of bond angle values for when molecules have different numbers of lone pairs. Will we be required to know these?
- Sun Nov 05, 2017 6:09 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet Max
- Replies: 2
- Views: 481
Re: Expanded Octet Max
I'm not sure about the second question, but I don't think there's a maximum number of bonds in expanded octet? Because it just depends on the next available empty orbital.
Sorry I couldn't answer the other question!
Sorry I couldn't answer the other question!
- Sun Nov 05, 2017 3:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Formal charge and lewis structures
- Replies: 5
- Views: 611
Formal charge and lewis structures
When drawing Lewis structures, do we need to find all the possible structures and draw the one which is most stable, or will the basic, most obvious Lewis structure suffice?
(for example, the SO2 structure)
(for example, the SO2 structure)
- Sun Oct 29, 2017 3:18 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.29
- Replies: 2
- Views: 356
2.29
Is there a specific method to solving this question?
How many electrons can have the following quantum numbers in an atom: (a) n =2, l = 1; (b) n =4, l = 2,
ml = -2; (c) n = 2; (d) n = 3, l = 2, ml = -1?
How many electrons can have the following quantum numbers in an atom: (a) n =2, l = 1; (b) n =4, l = 2,
ml = -2; (c) n = 2; (d) n = 3, l = 2, ml = -1?
- Sat Oct 28, 2017 5:51 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: d orbital [ENDORSED]
- Replies: 2
- Views: 369
Re: d orbital [ENDORSED]
Because minimum energy level for d-orbital is 3, when n=3 the values for l begin from zero i.e. l=0,1,2. (Where l=2 is the d-orbital)
So you'd have to fill up the 3d orbital at lower energy level before you move to the 4d orbital.
So you'd have to fill up the 3d orbital at lower energy level before you move to the 4d orbital.
- Sun Oct 22, 2017 2:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Angular Momentum Quantum Number [ENDORSED]
- Replies: 3
- Views: 621
Re: Angular Momentum Quantum Number [ENDORSED]
How exactly does angular momentum differ from l?
- Sat Oct 21, 2017 5:11 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electric Spin
- Replies: 5
- Views: 537
Re: Electric Spin
I don't think it matters for unpaired electrons; it just says that paired electrons should have the opposite spin numbers.
- Sat Oct 14, 2017 3:07 pm
- Forum: Photoelectric Effect
- Topic: Conversions for units in work function [ENDORSED]
- Replies: 2
- Views: 432
Conversions for units in work function [ENDORSED]
So in some of the solved examples as well as homework questions, the work function is given as eV or keV, where it has to be converted to Joules.
Will the values for these conversions be given to us on the test, or do we need to know them?
Will the values for these conversions be given to us on the test, or do we need to know them?
- Sun Oct 08, 2017 11:26 am
- Forum: Photoelectric Effect
- Topic: Units for photoelectric effect
- Replies: 2
- Views: 291
Units for photoelectric effect
Hey, does anyone know all the proper units for the equations in the photoelectric effect?
- Thu Oct 05, 2017 12:51 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E1
- Replies: 13
- Views: 3103
E1
The solutions manual wasn't very clear about this question... Question: The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encap...