Search found 23 matches

by Mayvera Doaran 2H
Thu Mar 10, 2016 10:51 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 1
Views: 200

Cell Diagrams

When writing cell diagrams, do you have to include the salts or the spectator ions that don't take part in the reaction? (spectator ions such as K+, Cl-, SO42-) Also, how do you identity spectator ions in a reaction?
by Mayvera Doaran 2H
Thu Mar 10, 2016 10:40 am
Forum: *Alkenes
Topic: E/Z vs. cis/trans
Replies: 2
Views: 481

E/Z vs. cis/trans

Is there a difference between E/Z and cis/trans? I know for E/Z, priority goes to the larger molecule when naming. What my TA told me was that for cis/trans, you must look at the longest carbon chain rather than the larger molecule. For instance, when deciding priority between Cl or CH 2 CH 2 CH 3 ,...
by Mayvera Doaran 2H
Wed Mar 02, 2016 8:07 pm
Forum: *Alkanes
Topic: Quiz 3 Preparation
Replies: 34
Views: 11119

Re: Quiz 3 Preparation

303747052 wrote:Just to clarify, do the parenthesis in the equations indicate a substituent?

eg:
CH3CH(CH3)....etc.


Yes, parenthesis indicate substituents!
by Mayvera Doaran 2H
Wed Mar 02, 2016 8:02 pm
Forum: *Electrophiles
Topic: Equal sign with a line through it
Replies: 4
Views: 959

Re: Equal sign with a line through it

Are you referring to double dagger? A double dagger refers to transition states.
by Mayvera Doaran 2H
Wed Mar 02, 2016 4:46 pm
Forum: *Complex Reaction Coordinate Diagrams
Topic: Reaction Steps
Replies: 2
Views: 576

Re: Reaction Steps

There are two main mechanisms you should know. The first one is eletrophilic addition reaction. This is where you usually attach a molecule (with two species) to a molecule with a double bond. This reaction is always two steps. The second one is substitution reaction (also known as SN2). This is whe...
by Mayvera Doaran 2H
Tue Feb 23, 2016 5:58 pm
Forum: *Nucleophilic Substitution
Topic: double/single-headed arrows
Replies: 6
Views: 1203

Re: double/single-headed arrows

What would be an example of when we'd use a single-headed arrow?
by Mayvera Doaran 2H
Sun Feb 21, 2016 5:57 pm
Forum: *Electrophiles
Topic: Identifying Electrophiles and Nucleophiles
Replies: 1
Views: 374

Identifying Electrophiles and Nucleophiles

How do you distinguish electrophiles from nucleophiles given any molecule? Would you need to compare two molecules to determine that?
by Mayvera Doaran 2H
Thu Feb 11, 2016 12:49 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate Order
Replies: 5
Views: 708

Rate Order

Are orders of reactants and rate laws in general always whole numbers? Or can there be orders that are fractions?
by Mayvera Doaran 2H
Thu Feb 11, 2016 11:29 am
Forum: General Rate Laws
Topic: Coefficients
Replies: 1
Views: 364

Coefficients

For reaction rates, do we use stoichiometric coefficients in the rate? Or do we just ignore them when establishing the rate law?
by Mayvera Doaran 2H
Wed Feb 10, 2016 12:35 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Reversible v. Irreversible
Replies: 1
Views: 287

Reversible v. Irreversible

For entropy, which equations do you use for isothermal reversible vs. irreversible free expansion? What does free expansion mean?
by Mayvera Doaran 2H
Mon Feb 08, 2016 6:35 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Delta S equals Zero
Replies: 1
Views: 498

Delta S equals Zero

I know that Delta S equals zero for reversible processes. Under what other conditions would Delta S equal zero as well?
by Mayvera Doaran 2H
Sun Feb 07, 2016 8:24 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Meaning of delta S of surroundings equation
Replies: 1
Views: 325

Meaning of delta S of surroundings equation

What does it mean when delta S of the surroundings is equal to the delta H of the system divided by the temperature? How does the delta H of the system affect the delta S of the surroundings conceptually?
by Mayvera Doaran 2H
Sun Feb 07, 2016 7:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G equals 0
Replies: 1
Views: 1646

Delta G equals 0

When delta G is positive, the reaction is not spontaneous. When it is negative, it is spontaneous. What does it mean when delta G equals zero?
by Mayvera Doaran 2H
Thu Feb 04, 2016 11:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Types
Replies: 2
Views: 315

Re: Cell Types

I thought voltaic cells could have negative cell potentials whereas galvanic cells always have positive cell potentials
by Mayvera Doaran 2H
Wed Feb 03, 2016 5:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Types
Replies: 2
Views: 315

Cell Types

What is the difference between a galvanic cell and a voltaic cell? What other cell types should we know?
by Mayvera Doaran 2H
Sun Jan 31, 2016 2:23 pm
Forum: Balancing Redox Reactions
Topic: Determining the Oxidation Number
Replies: 1
Views: 234

Determining the Oxidation Number

What's the oxidation number for diatomic hydrogen and oxygen? Is it zero?
by Mayvera Doaran 2H
Fri Jan 29, 2016 5:00 pm
Forum: Balancing Redox Reactions
Topic: Determining the Oxidation Number
Replies: 1
Views: 241

Determining the Oxidation Number

When we determine the oxidation number of a certain molecule in a reaction, do we take the oxidation number of a singular atom in that molecule?

For example, would the oxidation number for 2Cr2+ be +2 or +4?
by Mayvera Doaran 2H
Mon Jan 25, 2016 5:57 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermally and Reversibly
Replies: 1
Views: 259

Isothermally and Reversibly

When a reaction is isothermal and reversible why is the internal energy 0? When a reaction is just reversible, does internal energy equal 0 as well?
by Mayvera Doaran 2H
Tue Jan 19, 2016 11:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy vs. Internal Energy
Replies: 1
Views: 364

Enthalpy vs. Internal Energy

What's the difference between enthalpy, delta H, and internal energy, delta U? When does enthalpy equal internal energy?
by Mayvera Doaran 2H
Tue Jan 12, 2016 9:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.67: Carbon graphite
Replies: 2
Views: 295

8.67: Carbon graphite

For parts b, c, and d, carbon in its solid phase is shown in the equation as C(gr). I know the (gr) stands for graphite, but why use (gr) instead of (s)? Why do we assume that carbon is in its solid phase, using its enthalphy of sublimation, while we assume that hydrogen and oxygen are in their gas ...
by Mayvera Doaran 2H
Mon Jan 11, 2016 11:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Difference between Heat and Enthalpy
Replies: 2
Views: 1372

Re: Difference between Heat and Enthalpy

Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system.
by Mayvera Doaran 2H
Mon Jan 11, 2016 7:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat of Combustion vs. Heat of Formation
Replies: 3
Views: 18134

Re: Heat of Combustion vs. Heat of Formation

So to clarify, the heat of combustion is the opposite of heat of formation? So if you know the heat of combustion, you know the heat of formation?
by Mayvera Doaran 2H
Sat Jan 09, 2016 12:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat of Combustion vs. Heat of Formation
Replies: 3
Views: 18134

Heat of Combustion vs. Heat of Formation

What is the difference between the heat of combustion and the heat of formation? How do they relate to each other?

Go to advanced search