Search found 9 matches

by kimberly_oka_2j
Sun Mar 12, 2017 11:25 pm
Forum: *Electrophilic Addition
Topic: Transition State Question
Replies: 1
Views: 740

Re: Transition State Question

I think that all of it happens in the first transition state because to be able to form all these new bonds, some bonds need to be broken. In the case of HBr, H would not be able to bond with the carbon atom if it is still attached to Br, because hydrogen can only make bonds with one other atom. Thi...
by kimberly_oka_2j
Sun Mar 05, 2017 10:17 pm
Forum: *Electrophilic Addition
Topic: Help on HW 4.30 and the Arrhenius Equation
Replies: 1
Views: 667

Re: Help on HW 4.30 and the Arrhenius Equation

In page 154 of the Organic Chemistry textbook, it says that "reactions with activation energies below 80 kJ/mol can occur at room temperature, while those with larger activation energies require energy input (heat, light or electricity) to occur". In my opinion, we can use this information...
by kimberly_oka_2j
Sun Feb 19, 2017 11:39 pm
Forum: Second Order Reactions
Topic: Order reactions
Replies: 6
Views: 686

Re: Order reactions

Zero order reactions have rates that are not affected by a change in the concentration, first order reactions have rates that are proportional to the change in the concentration, and second order reactions have rates that are proportional to the square of the change in the concentration. We won't be...
by kimberly_oka_2j
Sun Feb 19, 2017 11:28 pm
Forum: First Order Reactions
Topic: [R]t
Replies: 1
Views: 416

Re: [R]t

It is the R at time t
by kimberly_oka_2j
Sun Feb 05, 2017 11:31 pm
Forum: Balancing Redox Reactions
Topic: Oxygen Ion Charge
Replies: 3
Views: 869

Re: Oxygen Ion Charge

Yes, there are some exceptions to the typical -2 oxidation number of oxygen. One example is in peroxides (H2O2). Because the compound is overall neutral and because the oxidation number of hydrogen +1, the oxidation number of oxygen must be -1. Another example is in F2O. Fluorine is more electronega...
by kimberly_oka_2j
Sun Jan 29, 2017 10:38 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: DeltaG
Replies: 1
Views: 373

Re: DeltaG

DeltaG is the Gibbs free energy. It allows us to know whether or not a reaction is spontaneous, how much non expansion work we can get from the system, and how a temperature change can affect how spontaneous the reaction is. Provided the temperature and the pressure are constant, the direction of sp...
by kimberly_oka_2j
Sun Jan 29, 2017 10:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 3
Views: 464

Re: Bond Enthalpies

When in doubt, it is better to draw the lewis structure of the molecules involved in the reaction. By looking at the reactants and the products, you can clearly see which of the bonds are broken in the reactants and which of those broken bonds are rearranged in the products to be formed.
by kimberly_oka_2j
Sun Jan 22, 2017 9:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating final temperature of a solution? (HW 8.99)
Replies: 1
Views: 318

Re: Calculating final temperature of a solution? (HW 8.99)

This was how my TA explained the question to me. He approached the question differently, but I do hope this is also helpful! Because zinc is the limiting reactant, we use the moles of that to calculate "q" and eventually to calculate "delta T". We already know that the enthalpy o...
by kimberly_oka_2j
Sun Jan 15, 2017 10:26 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of Sublimation
Replies: 3
Views: 508

Re: Enthalpy of Sublimation

Here's another way to understand this: the enthalpy of sublimation is equal to both of those things. This is because when you add the enthalpy of vaporization (Hvapour - Hliquid) and the enthalpy of fusion (Hliquid - Hsolid), the Hliquid will cancel out, resulting in Hvapour - Hsolid.

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