Search found 52 matches
- Sun Mar 18, 2018 7:20 pm
- Forum: General Rate Laws
- Topic: rate law
- Replies: 6
- Views: 674
Re: rate law
Rate Laws do not include products.
- Sun Mar 18, 2018 9:06 am
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Final
- Replies: 3
- Views: 805
Final
In the final, would we have to identify the functional groups from complex molecules or when they are alone?
- Sun Mar 18, 2018 9:02 am
- Forum: Balancing Redox Reactions
- Topic: test 2
- Replies: 5
- Views: 515
Re: test 2
The answer should be E=-0.037V
- Sat Mar 17, 2018 3:49 pm
- Forum: General Rate Laws
- Topic: Test #3 Q. 3
- Replies: 2
- Views: 430
Test #3 Q. 3
How do you solve question #3 on the kinetics test?
- Sun Mar 11, 2018 10:22 pm
- Forum: *Enzyme Kinetics
- Topic: Kinetics and Enzymes
- Replies: 7
- Views: 795
Kinetics and Enzymes
What role do enzymes play in kinetics?
- Sun Mar 11, 2018 10:14 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Given information
- Replies: 5
- Views: 325
Re: Given information
I am pretty sure it should be specified which one is the slow and fast reaction. I am not sure about the intermediate though.
- Mon Mar 05, 2018 10:48 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Unique rates
- Replies: 4
- Views: 395
Unique rates
What are unique rates? Do we need to know that for test 3?
- Sun Mar 04, 2018 11:46 pm
- Forum: First Order Reactions
- Topic: half-lives
- Replies: 4
- Views: 279
Re: half-lives
Half lives can allow you to determine the age of an artifact/fossils, measure radioactive decay, and many other things.
- Sun Mar 04, 2018 11:35 pm
- Forum: Zero Order Reactions
- Topic: Identifying zero order
- Replies: 6
- Views: 438
Identifying zero order
How can you identify a zero order reactant based on a table? Is there a "shortcut"?
- Sun Mar 04, 2018 11:33 pm
- Forum: General Rate Laws
- Topic: general rate laws
- Replies: 3
- Views: 245
Re: general rate laws
Thank is the general law, but as mentioned before the exponents would change depending on the order of the reactants.
- Mon Feb 26, 2018 7:15 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 14.47
- Replies: 3
- Views: 270
14.47
For part a. in the solution manual the value of Q is 10^6, but I keep getting 3269017. What am I doing wrong? Isn't the e^15=3269017.
- Sun Feb 25, 2018 10:02 pm
- Forum: General Rate Laws
- Topic: Slow Step
- Replies: 2
- Views: 189
Re: Slow Step
The slow step is known as the rate determining step in a reaction mechanism. This step is simply the one with the slowest rate.
- Sun Feb 25, 2018 9:57 pm
- Forum: General Rate Laws
- Topic: Reaction rates
- Replies: 3
- Views: 260
Reaction rates
When anazyling initial reaction rates, why do we only focus on the reactant concentration?
- Sun Feb 25, 2018 9:53 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 14.43
- Replies: 1
- Views: 205
14.43
When solving for [H+], when you subtract standard E from E wouldn't the answer be negative? I keep getting -0.079 but the solutions manual has a positive value. What am I doing wrong?
- Sun Feb 18, 2018 9:18 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Reactions
- Replies: 4
- Views: 457
Re: Balancing Redox Reactions
Yes, you use H+ in acidic solutions and OH- in basic solutions.
- Sun Feb 18, 2018 9:14 pm
- Forum: Balancing Redox Reactions
- Topic: 14.5d
- Replies: 2
- Views: 204
Re: 14.5d
In this problem, P4 is both the reducing and oxidizing agent. Therefore, you can start by separating and balancing both half-reactions. Remember, you start with P4 in both reactions. After balancing them you can combine them in order to get the final equation.
- Sun Feb 18, 2018 9:08 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing
- Replies: 3
- Views: 340
Re: Balancing
Yes, You use H20 to balance the Oxygens and H+ or OH- to balance the hydrogens.
- Sun Feb 18, 2018 9:06 pm
- Forum: Balancing Redox Reactions
- Topic: "Rules"
- Replies: 7
- Views: 439
"Rules"
Is there a set of "rules" or order in which half-reactions should be balanced? Like do you add H20 or OH- first?
- Wed Feb 14, 2018 12:21 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 2
- Views: 380
Van't Hoff Equation
will the midterm focus on Van't Hoff ?
- Mon Feb 12, 2018 7:08 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: 9.75
- Replies: 1
- Views: 195
9.75
How can you determine the degeneracy of cis-MX2Y4 and trans-MX2Y4?
- Sun Feb 11, 2018 7:56 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Irreversible vs Reversible
- Replies: 3
- Views: 286
Irreversible vs Reversible
In simple terms, what is the difference between a reversible and irreversible expansion? How can you quickly identify them in a problem?
- Sun Feb 11, 2018 7:54 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal Expansion
- Replies: 1
- Views: 177
Isothermal Expansion
Can someone please explain why in an isothermal expansion the external pressure cannot be greater than the internal pressure.
- Sun Feb 11, 2018 11:07 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 2nd law -- conceptual
- Replies: 3
- Views: 260
Re: 2nd law -- conceptual
Technically, you can have a negative entropy. It would just mean it is not favorable and would not occur frequently.
- Sun Feb 04, 2018 4:21 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Work and Free energy
- Replies: 1
- Views: 124
Work and Free energy
How does work affect free energy? is there a relationship between these two terms?
- Sun Feb 04, 2018 4:19 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Free Energy
- Replies: 2
- Views: 173
Free Energy
Can someone explain how reaction free energy depends on pressure and equilibrium constant, please?
- Sun Feb 04, 2018 4:09 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Periodic Trends
- Replies: 4
- Views: 336
Re: Periodic Trends
I don't think there is a heat capacity trend of the periodic table because heat capacities depends on different factors, such as change in temperature, the system, and its mass. As well as the substance and its phase.
- Sun Jan 28, 2018 10:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: degeneracy [ENDORSED]
- Replies: 7
- Views: 444
Re: degeneracy [ENDORSED]
Degeneracy refers to the number of ways of obtaining a certain energy state. Degeneracy and entropy are inverses of each other. That is, the higher the degeneracy, the lower the entropy.
- Sun Jan 28, 2018 7:47 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Definition of Entropy
- Replies: 10
- Views: 609
Definition of Entropy
Since we should not use the concept of disorder when defining/explaining entropy, what would be the correct definition? How would you explain entropy?
- Thu Jan 25, 2018 8:54 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.99
- Replies: 3
- Views: 256
8.99
Can someone please explain me how can you calculate the enthalpy of formation for 2HCl(aq)+Zn(s) ---> H2(g)+ZnCl2(aq). I can't find the enthalpy value for ZnCl2.
- Sat Jan 20, 2018 8:05 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: When to use units of kJ/mol vs kJ?
- Replies: 1
- Views: 177
Re: When to use units of kJ/mol vs kJ?
You will have to use the units KJ/mol whenever you are asked to calculate the enthalpy of a reaction for 1 mole of a reactant/product.
- Sat Jan 20, 2018 7:56 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.73
- Replies: 2
- Views: 193
8.73
In problem 8.73 why are the bond enthalpies for C-H not included?
- Sat Jan 20, 2018 7:55 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heating Curve
- Replies: 2
- Views: 163
Heating Curve
In test #1, would there be questions regarding heating curves? That is, problems in which we would need to calculate the energy needed for one substance to go from one state to another.
- Sun Jan 14, 2018 8:24 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Type of Systems
- Replies: 2
- Views: 179
Type of Systems
Can someone please explain the difference between an open, closed, and isolated system? How can you identity/differentiate them?
Thank you!
Thank you!
- Sun Jan 14, 2018 8:20 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Which q is negative?
- Replies: 2
- Views: 149
Re: Which q is negative?
-When heat is being transferred into the system, q>0 (q is positive)
-When heat is being transferred out of the system, q<0 (q is negative)
-When heat is being transferred out of the system, q<0 (q is negative)
- Sun Jan 14, 2018 8:13 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Molar Heat Capacity
- Replies: 1
- Views: 84
Molar Heat Capacity
Can someone please explain why the molar heat capacity is higher for complex molecules? How does bond vibrations affect heat capacity?
- Sat Dec 09, 2017 2:34 pm
- Forum: Balancing Chemical Reactions
- Topic: Net Number of moles produced [ENDORSED]
- Replies: 3
- Views: 450
Net Number of moles produced [ENDORSED]
Based on a balanced chemical equation, how can you calculate the net number of moles of gas produced?
- Sun Dec 03, 2017 5:38 pm
- Forum: Lewis Acids & Bases
- Topic: Weak Bases
- Replies: 2
- Views: 247
Weak Bases
Why are weak bases not completely ionized? How do weak and strong bases differ?
- Sun Dec 03, 2017 5:25 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Concept Q// Change in Temp
- Replies: 3
- Views: 237
Re: Concept Q// Change in Temp
If a reaction is exothermic and the temperature is increased, the reaction will shift to the left in order to reduce the temperature. When the reactants are favored, more heat is absorbed (Which helps absorbed the extra heat and reach equilibrium again).
- Sun Dec 03, 2017 5:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Part 1B Post-Module Assessment #26
- Replies: 2
- Views: 173
Re: Part 1B Post-Module Assessment #26
Whenever solvents are liquids or solids they are not in included in equilibrium constant expressions. This is because the change in solvent concentration is insignificant.
- Sat Nov 25, 2017 2:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: solvents in K
- Replies: 3
- Views: 308
Re: solvents in K
Something important to keep in mind is that solids and liquids are not included in k expressions.
- Sat Nov 25, 2017 2:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Question about ATP lecture example
- Replies: 1
- Views: 138
Re: Question about ATP lecture example
If initial concentrations are given, you would add/subtract that concentration by the value by which the molar concentration changes (the x value).
- Sat Nov 25, 2017 2:08 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Bond Order
- Replies: 2
- Views: 710
Bond Order
Does anyone know if bond order would be a big component of test 4? I don't really remember discussing about it in class.
- Sun Nov 19, 2017 11:32 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Cis- & Trans-
- Replies: 3
- Views: 193
Cis- & Trans-
What is the differential between cis- and trans-? How do you know when the isomer is cis- or trans-?
- Sun Nov 19, 2017 11:29 am
- Forum: Bond Lengths & Energies
- Topic: Bond Order
- Replies: 6
- Views: 640
Re: Bond Order
In order to determine the bond order, add the number of bonds in that compound and divide that by the total number of atoms.
- Sun Nov 19, 2017 11:22 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 5
- Views: 400
Re: Bond Order
A BO=1.5 means that the compound has resonance structures. Therefore, all the bonds have the characteristics of both single and double bonds.
- Sun Nov 19, 2017 10:59 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Delocalized Pi Bond
- Replies: 2
- Views: 218
Re: Delocalized Pi Bond
In simple words, the term delocalized pi bond is used to describe a pi bond that can move around in the different resonate structures of a molecule.
- Sun Nov 19, 2017 10:48 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 3
- Views: 193
Polydentate
Can someone please explain how you can determine when a ligand can be polydentate? what makes a ligand polydentate?
- Fri Oct 27, 2017 12:45 am
- Forum: Trends in The Periodic Table
- Topic: 2.71
- Replies: 1
- Views: 229
2.71
Can someone please explain what diagonal relationships are? And provide examples to help me visualize them, if possible.
- Sun Oct 22, 2017 1:42 pm
- Forum: Photoelectric Effect
- Topic: Post Module #24
- Replies: 3
- Views: 258
Re: Post Module #24
The answer is Ultraviolet light. I think that one of the reason is because ultraviolet light has a relatively small wavelength, which results in high frequency. As we have learned, high frequency results in high energy. Therefore, more electrons were able to be transmitted under ultraviolet light. D...
- Sun Oct 22, 2017 1:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Cartesian axes [ENDORSED]
- Replies: 2
- Views: 382
Cartesian axes [ENDORSED]
Can someone please explain Cartesian axes and how can the orientation of orbitals be described using this term, please?
Thank you
Thank you
- Sun Oct 15, 2017 10:40 pm
- Forum: Properties of Light
- Topic: Speed of Light Constant
- Replies: 18
- Views: 1059
Re: Speed of Light Constant
I think any of these two values will be okay. Using 3.00*10^8 will only give you easier values to work with.
- Tue Oct 10, 2017 5:35 pm
- Forum: Properties of Light
- Topic: Chapter 1 #3
- Replies: 9
- Views: 596
Chapter 1 #3
Can someone please explain what happens when the frequency of electromagnetic radiation decreases?
Based on the textbook, the answer is (c). the extent of the change in the electrical field at a given point decreases. But I don't know why or how to explain it.
Based on the textbook, the answer is (c). the extent of the change in the electrical field at a given point decreases. But I don't know why or how to explain it.