## 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: 430

### 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: 171

### 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: 389

### 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: 364

### 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: 694

### 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: 525

### 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: 104

### 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: 49

### 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: 119

### 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: 87

### 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: 208

### 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: 112

### 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: 105

### 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: 143

### 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.
Sun Feb 10, 2019 12:26 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Calculation Help
Replies: 1
Views: 85

### 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: 743

### 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: 194

### 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
Tue Feb 05, 2019 5:47 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Quick Conceptual question
Replies: 7
Views: 300

### 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: 143

### 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: 47

### 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: 116

### 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: 777

### 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: 429

### 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: 355

### 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: 95

### 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: 1820

### 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: 162

### 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: 207

### 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: 132

### 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: 42

### 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: 11
Views: 630

### 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: 200

### 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: 93

### 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: 82

### 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: 117

### 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: 163

### 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: 103

### 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: 103

### Difference

What is the difference between paramagnetism and diamagnetism?
Mon Nov 19, 2018 8:16 pm
Forum: Hybridization
Topic: Hybidization
Replies: 1
Views: 77

### 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: 163

### 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: 262

### 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: 359

### 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: 383

### 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: 379

### 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: 408

### 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: 154

### 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: 71

### 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: 218

### How do both intersect?

Sun Oct 21, 2018 11:07 pm
Forum: Bond Lengths & Energies
Topic: Bond length Correlation
Replies: 2
Views: 210

### 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: 229

### 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: 212

### 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: 442

### Re: Past Final Exams

Sun Oct 21, 2018 9:59 pm
Forum: Student Social/Study Group
Topic: HW Schedule?
Replies: 7
Views: 525

### 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: 81

### 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: 88

### 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: 196

### 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: 74

### 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: 194

### 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: 130

### 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: 200

### 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: 115

### 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: 71

### 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?