Search found 62 matches
- Mon Mar 11, 2019 9:07 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Rate vs. Initial Rate
- Replies: 4
- Views: 791
Re: Rate vs. Initial Rate
The difference would be that rate law relates to the rates of the concentrations while the initial rate is dependent on initial concentrations. So you could also look at the information they give you.
- Mon Mar 11, 2019 8:49 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation.
- Replies: 4
- Views: 535
Arrhenius Equation.
How would one know in which case to use the Arrhenius equation?
- Mon Mar 11, 2019 8:46 pm
- Forum: Biological Examples
- Topic: Enzymes, Lecture example.
- Replies: 3
- Views: 1176
Re: Enzymes, Lecture example.
I believe he meant an enzyme catalyzed reaction. The rate is unaffected by the amount of the reactant present so the enzyme will remain unaffected. No impact on rate law so zero order.
- Sun Mar 03, 2019 11:25 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: rate of change
- Replies: 4
- Views: 787
Re: rate of change
The ratio is what relates them (Stoich). They are joined by the coefficients.
- Sun Mar 03, 2019 11:04 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: how is kinetics different?
- Replies: 17
- Views: 1678
Re: how is kinetics different?
Kinetics is about the rate at which things react (quickly, slowly) while thermodynamics is about stability in different states. One focuses on movement and change while the other on stability. It may also be noted they have different quantities. Free energy vs activation energy.
- Sun Mar 03, 2019 10:58 pm
- Forum: Zero Order Reactions
- Topic: Order distinction
- Replies: 9
- Views: 1114
Order distinction
How does one determine which order a reaction is?
- Wed Feb 27, 2019 11:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell potential
- Replies: 2
- Views: 300
Cell potential
How is std cell potential calculated from cell diagrams?
- Wed Feb 27, 2019 11:47 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Half rxn
- Replies: 1
- Views: 185
Half rxn
Could someone explain what exactly a half reaction is? both conceptually and mathematically?
- Wed Feb 27, 2019 11:46 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.9 ch 14
- Replies: 3
- Views: 420
14.9 ch 14
Hello! I was wondering if someone could explain how to get started/ work through on this problem a bit confused?
- Thu Feb 21, 2019 8:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Calculating Gibbs
- Replies: 2
- Views: 324
Re: Calculating Gibbs
n is the number of moles so you would have to look at the problem and work from there.
- Thu Feb 21, 2019 8:48 pm
- Forum: Balancing Redox Reactions
- Topic: Difference
- Replies: 3
- Views: 504
Difference
Is there a difference between balancing a redox reaction and a normal reaction?
- Thu Feb 21, 2019 8:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Explanation
- Replies: 3
- Views: 482
Explanation
Could someone explain what exactly galvanic cells?
- Sun Feb 10, 2019 12:34 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Calculation Help
- Replies: 1
- Views: 215
Calculation Help
Can anyone explain how to know what equation to use for Dif problems?
- Sun Feb 10, 2019 12:29 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Entropy, Enthalpy, Free Energy.
- Replies: 2
- Views: 361
Re: Entropy, Enthalpy, Free Energy.
Enthalpy (H)- measure of how much energy is released or absorbed during a chemical reaction.
Entropy (S) - measure of disorder or randomness in the system
Gibbs free energy- amount of energy left over after a chemical reaction has happened.
Entropy (S) - measure of disorder or randomness in the system
Gibbs free energy- amount of energy left over after a chemical reaction has happened.
- Sun Feb 10, 2019 12:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Calculation Help
- Replies: 1
- Views: 241
Calculation Help
Why do we have to use 5/2 and 3/2 to solve the equations? I understand that they are a type of constant but how do we derive these specific numbers?
- Tue Feb 05, 2019 6:15 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Cup of Tea
- Replies: 17
- Views: 2550
Re: Cup of Tea
A cup of tea is open to the surroundings. So matter can enter and exit (steam, sugar, etc.) and energy can leave in the form of heat.
- Tue Feb 05, 2019 5:59 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open vs Closed Systems
- Replies: 4
- Views: 515
Re: Open vs Closed Systems
Open System: BOTH matter and energy interact with surrounding.
Closed System: ONLY energy interacts with surroundings.
Isolated system: NOTHING interacts with surroundings
Closed System: ONLY energy interacts with surroundings.
Isolated system: NOTHING interacts with surroundings
- Tue Feb 05, 2019 5:47 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Quick Conceptual question
- Replies: 7
- Views: 952
Quick Conceptual question
Could someone explain the difference between enthalpy and entropy? And what equations would be used in each case?
- Tue Jan 29, 2019 8:07 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 4
- Views: 456
Re: Enthalpy
Yes, the delta H is equivalent to the enthalpy. You get the exact number using hess's law.
- Tue Jan 29, 2019 8:03 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Std enthalpy combustion
- Replies: 1
- Views: 118
Std enthalpy combustion
How do we solve for std enthalpy of combustion? or will it be given?
- Tue Jan 29, 2019 8:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpy
- Replies: 2
- Views: 303
Bond Enthalpy
How exactly does one use bond enthalpies?
- Thu Jan 24, 2019 10:14 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q VS. K
- Replies: 13
- Views: 1642
Re: Q VS. K
k is at equilibrium, Q is non equilibrium you use an ice table to solve for both.
- Thu Jan 24, 2019 10:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH
- Replies: 9
- Views: 1089
Re: pH
pH is how much acidic or basic a substance is. The equation is pH = -log[H3O+].
- Thu Jan 24, 2019 10:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 8
- Views: 797
Re: Test 1
I think as long as you know the most common or how to tell the difference between them you should be fine.
- Thu Jan 17, 2019 10:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: conjugates
- Replies: 3
- Views: 232
conjugates
why are conjugates weaker than the original acids and bases?
- Thu Jan 17, 2019 10:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acids and Bases
- Replies: 2
- Views: 1975
Acids and Bases
How can you teak the difference between a weak acid and strong acid?
- Tue Jan 15, 2019 10:07 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: bases and acids
- Replies: 2
- Views: 359
bases and acids
How would the reaction quotient and the non equilibrium conditions be applied in the cases of base and acids?
- Tue Jan 08, 2019 10:07 pm
- Forum: Ideal Gases
- Topic: Definition
- Replies: 2
- Views: 488
Definition
What is the difference between an ideal gas and a normal gas how do we differentiate?
- Tue Jan 08, 2019 10:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculations
- Replies: 2
- Views: 281
Calculations
Can someone explain the difference in calculating K, Kc And Kp.
- Tue Jan 08, 2019 9:45 pm
- Forum: Ideal Gases
- Topic: Conversion
- Replies: 1
- Views: 90
Conversion
Could someone explain how the conversion of the PV=nRT equation is made. I saw in class but I still do not understand how its applied separately with gasses and liquids.
- Wed Dec 05, 2018 6:32 pm
- Forum: Polyprotic Acids & Bases
- Topic: Defintion
- Replies: 39
- Views: 2574
Defintion
How do you know when a base or acid is Polyprotic?
- Wed Dec 05, 2018 6:28 pm
- Forum: Bronsted Acids & Bases
- Topic: Identifying the difference
- Replies: 6
- Views: 633
Identifying the difference
How can you tell the difference between bronstead acids and bases and normal acids and bases? which problems do you use each one for?
- Wed Dec 05, 2018 6:01 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Identifying the difference
- Replies: 3
- Views: 235
Identifying the difference
How can you tell whether a slat is acidic or baisc?
- Mon Nov 19, 2018 8:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Length and Bond Angles
- Replies: 2
- Views: 215
Bond Length and Bond Angles
Does bond length affect bond angles?
- Mon Nov 19, 2018 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Importance of Molecular Shape
- Replies: 2
- Views: 371
Importance of Molecular Shape
What is the importance of Molecular Shape?
- Mon Nov 19, 2018 8:34 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Determining bond order
- Replies: 2
- Views: 336
Determining bond order
How does one determine the bond order?
- Mon Nov 19, 2018 8:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining bond type
- Replies: 4
- Views: 365
Determining bond type
How do you determine which bond type is found rather pi or Sigma?
- Mon Nov 19, 2018 8:18 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Difference
- Replies: 1
- Views: 226
Difference
What is the difference between paramagnetism and diamagnetism?
- Mon Nov 19, 2018 8:16 pm
- Forum: Hybridization
- Topic: Hybidization
- Replies: 1
- Views: 224
Hybidization
How do hybridization and bond angels relate? As in How do they affect each other?
- Tue Nov 13, 2018 10:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion Strength
- Replies: 3
- Views: 454
Re: Repulsion Strength
I believe It would be caused by the levels of electric charge. lone pairs energy differs from bonded pairs which are more stable. Lone pairs have more mobility as well so their repulsion is stronger.
- Tue Nov 13, 2018 10:17 pm
- Forum: Hybridization
- Topic: Bond Angels
- Replies: 5
- Views: 702
Bond Angels
I still don't quite understand how bond angles are found. Can someone explain how to solve for them?
- Tue Nov 13, 2018 10:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Remembering
- Replies: 8
- Views: 859
Remembering
I'm. having a hard time remembering how to determine the VSERP does anyone have any tricks or strategies to remember which go with which?
- Tue Nov 06, 2018 10:41 pm
- Forum: Octet Exceptions
- Topic: Octet rule vs. Formal charge
- Replies: 7
- Views: 1077
Re: Octet rule vs. Formal charge
Octet is preferred, formal charge is used to choose between structures that already fulfill the octet.
- Tue Nov 06, 2018 10:38 pm
- Forum: Electronegativity
- Topic: What are the trends useful for?
- Replies: 12
- Views: 1012
Re: What are the trends useful for?
Trends help with determining unknown elements.
- Tue Nov 06, 2018 10:29 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 11
- Views: 1334
Re: Formal Charge
Formal charge has to be zero because that means that the element is at its most stable point. Electrons tend to organize themselves to be in the most stable state they can so naturally a structure with all zero formal charges will grant them this.
- Tue Oct 30, 2018 8:33 pm
- Forum: Resonance Structures
- Topic: Resonance merging
- Replies: 3
- Views: 434
Resonance merging
In class Professor Lavelle Stated that the true resonance structure is actually a mixture of all resonance structures I didn't quite get why that is. Could someone explain in detail.
- Tue Oct 30, 2018 8:29 pm
- Forum: Resonance Structures
- Topic: Bond Angels
- Replies: 1
- Views: 229
Bond Angels
We were talking about bond angles in lecture so I'm assuming we will ned them in the future is there a way to calculate for bond angles or de Wie just have to memorize them?
- Tue Oct 30, 2018 8:26 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: How do both intersect?
- Replies: 3
- Views: 371
How do both intersect?
How would formal charge help you find the oxidation numbers?
- Sun Oct 21, 2018 11:07 pm
- Forum: Bond Lengths & Energies
- Topic: Bond length Correlation
- Replies: 2
- Views: 419
Bond length Correlation
Why is there a correlation between bond length and bond energy?
- Sun Oct 21, 2018 10:57 pm
- Forum: Octet Exceptions
- Topic: Specific formula
- Replies: 3
- Views: 419
Specific formula
Is there a specific formula to find out how to deal with the octet exceptions or how to find them?
- Sun Oct 21, 2018 10:44 pm
- Forum: Dipole Moments
- Topic: Requirements
- Replies: 1
- Views: 425
Requirements
Could someone please explain to me the requirements for a diopole moment to occur? and what exactly they happen to be?
- Sun Oct 21, 2018 10:01 pm
- Forum: Student Social/Study Group
- Topic: Past Final Exams
- Replies: 6
- Views: 781
Re: Past Final Exams
Same here please? Jtorres75a@gmail.com
- Sun Oct 21, 2018 9:59 pm
- Forum: Student Social/Study Group
- Topic: HW Schedule?
- Replies: 7
- Views: 978
Re: HW Schedule?
Hey, does anyone know is for the 23rd of October we have to do hw from Quantum world or next topic?
- Wed Oct 17, 2018 8:08 pm
- Forum: *Shrodinger Equation
- Topic: Application
- Replies: 1
- Views: 219
Application
What type pf problems would you use this equation for?
- Wed Oct 17, 2018 8:05 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron locations
- Replies: 2
- Views: 279
Electron locations
How do you determine in which orbital you will find the electron? Or how many orbitals to draw?
- Wed Oct 17, 2018 8:04 pm
- Forum: Properties of Light
- Topic: Wave/particles
- Replies: 5
- Views: 492
Wave/particles
Can anyone explain how light can be both a particle and a wave I don't understand how it can be both since they have completely different properties.
- Thu Oct 11, 2018 5:32 pm
- Forum: Einstein Equation
- Topic: Using einstiens Equation
- Replies: 1
- Views: 165
Using einstiens Equation
I know that we can rearrange this equation to find a third component as long as we have the other two my question is how exactly do units cancel out if they are all different or are we allowed to apply it without taking them into account?
- Thu Oct 11, 2018 5:29 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg
- Replies: 5
- Views: 485
Heisenberg
What exactly is the Heisenberg Indeterminacy and how is it applied?
- Thu Oct 11, 2018 5:04 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Finding quantum numbers [ENDORSED]
- Replies: 2
- Views: 316
Finding quantum numbers [ENDORSED]
Can someone explain how to find the quantum numbers? I am unsure how to find the remaining three I already know for n I just have to find the shell number the rest are more confusing.
- Thu Oct 04, 2018 10:45 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy and Precision
- Replies: 4
- Views: 495
Accuracy and Precision
Hey, I was wondering if someone could clearly explain the difference between Accuracy and precision in chemistry (lab setting) thanks!
- Thu Oct 04, 2018 10:37 pm
- Forum: Empirical & Molecular Formulas
- Topic: Writing Out Chemical Equation
- Replies: 2
- Views: 293
Re: Writing Out Chemical Equation
Generally you would follow the hill system. In the case you asked the Silicon goes first followed by the oxygen atoms (o atoms tend to be last).
- Thu Oct 04, 2018 10:32 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 283
Sig Figs
Hello, I have forgotten the specific rules for sig figs when dividing, multiplying, adding and subtracting could someone please give me a breifing?