Search found 11 matches

by Aishwarya_Natarajan_2F
Sat Mar 18, 2017 4:00 am
Forum: General Rate Laws
Topic: Coefficients in rate laws
Replies: 1
Views: 322

Re: Coefficients in rate laws

You would only use coefficients as exponents when writing rate laws for elementary steps of a reaction mechanism, otherwise coefficients cannot be used to write a rate law.
by Aishwarya_Natarajan_2F
Sat Mar 11, 2017 5:03 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Relationship between activation energy and pseudo delta g
Replies: 2
Views: 1035

Re: Relationship between activation energy and pseudo delta g

I don't believe that a correlation doesn't exist, because it is correlated to an extent. In the case of the reaction, ΔG*= ΔH*−TΔS* , and we know that in the case of a reaction, the ΔG* values are always positive, and part of this is because ΔH* is positive while ΔS* is a negligible value. Because o...
by Aishwarya_Natarajan_2F
Thu Mar 02, 2017 12:32 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Catalyst Phase
Replies: 3
Views: 424

Re: Catalyst Phase

Homogeneous catalysts are in the same phase as the reactants while heterogeneous catalysts are not. As far as I understand, the phase matters in terms of effectivity depending on the phase that the reactants are in. For example, a solid catalyst in an aqueous solution or a liquid catalyst in an aque...
by Aishwarya_Natarajan_2F
Thu Mar 02, 2017 12:24 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Self-Test 4.4A
Replies: 1
Views: 269

Re: Self-Test 4.4A

In Step 1, the Ea is measured from the energy of the reactants to the energy of TS1 while in step 2, the Ea is measured from the energy of the intermediates to the energy of TS2 (check pg 154). However, a standard convention for organic chemists is to measure differences in Gibbs free energy in resp...
by Aishwarya_Natarajan_2F
Fri Feb 24, 2017 3:18 pm
Forum: First Order Reactions
Topic: 15.23 (c)
Replies: 3
Views: 523

Re: 15.23 (c)

In this question when you use the unique rate equation for the reaction you know that the rate of increase in products in the rate of decrease in reactants, and therefore: -(1/2)d[A]/dt = d[b]/dt Using this we can find the rate of decrease in A by multiplying the rate of increase of B by 2. Then thi...
by Aishwarya_Natarajan_2F
Sun Feb 19, 2017 6:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Drawing a Cell Diagram
Replies: 3
Views: 563

Re: Drawing a Cell Diagram

You include Pt on the side of the cell diagram if on that side of the diagram it is not possible to have a solid electrode of that substance, for example for hydrogen you could use Pt as an electrode. If this is the case for both the anode and cathode sides, you would do this on both sides. Pt is an...
by Aishwarya_Natarajan_2F
Sun Feb 12, 2017 11:03 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Metallic Components
Replies: 3
Views: 352

Re: Inert Metallic Components

The examples in the book include Pt(s)| H2(g) | H+ (aq) || Zn2+(aq) | Zn(s)

It can be used as an electrode where hydrogen is oxidized in a reaction and cannot be used as an electrode.
by Aishwarya_Natarajan_2F
Sun Feb 12, 2017 10:37 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox reactions
Replies: 1
Views: 265

Re: Balancing Redox reactions

It isn't so much about putting one on the reactant v. product side as it is making sure there are equal numbers of each on both sides. When balancing redox reactions in basic solutions: 1) split the reaction up into its half reactions For each half reaction: 2)balance all elements that do not includ...
by Aishwarya_Natarajan_2F
Sun Jan 29, 2017 10:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Example 8.5 in Textbook
Replies: 1
Views: 375

Re: Example 8.5 in Textbook

The change in internal energy is equal to 0 because we are told that the gas is an ideal gas.

When an ideal gas expands isothermally, the change in internal energy is equal to 0.
by Aishwarya_Natarajan_2F
Sun Jan 22, 2017 5:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Chapter 8 HMWK Problem 8.21 Clarification
Replies: 1
Views: 392

Re: Chapter 8 HMWK Problem 8.21 Clarification

In a case of heat transfer between a system and it's surroundings, we assume qsystem +qsurrounding= 0 , or in other words q sys = -q sur In this case the problem is asking us to examine heat transfer between a piece of copper at a temp of 100 deg C (the system) and the water at 22.0 deg C (the surro...
by Aishwarya_Natarajan_2F
Sun Jan 15, 2017 11:30 am
Forum: Calculating Work of Expansion
Topic: Reversible and Irreversible Processes
Replies: 2
Views: 304

Re: Reversible and Irreversible Processes

Reversible processes can be reversed by an infinitely small change in a variable while an irreversible process doesn't. One of the applications of these two is taking the example of a piston, when can reverse directions in a reversible process with small changes in pressure, and this doesn't happen ...

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