Search found 11 matches

by Tram Ha 3I
Sat Mar 12, 2016 7:47 pm
Forum: *Alkanes
Topic: Priority naming - Alphabetical vs. # substituents
Replies: 1
Views: 268

Re: Priority naming - Alphabetical vs. # substituents

We apply the lowest number to chloro because it comes first alphabetically. We always want to start a substituent with the lowest number. 2-chloro-2,4,4-trimethylpentane would be correct!
by Tram Ha 3I
Sun Mar 06, 2016 10:52 pm
Forum: *Amines
Topic: R carbon variable
Replies: 1
Views: 330

Re: R carbon variable

I don't think we have to know what R specifically stands for; R just represents a carbon or carbon chain. We have to identify if the carbon chain includes a single/double/triple bond only to determine the infix (type of c bonds in parent chain). For example, on pg 104 in the course reader, CH3CH2CH2...
by Tram Ha 3I
Sun Feb 28, 2016 7:06 pm
Forum: *Haloalkenes
Topic: Bond/Functional Group Priority
Replies: 1
Views: 718

Bond/Functional Group Priority

Do double and triple bonds have higher priority than functional groups, or is it the other way around? It seemed like bonds had priority (e.g. in 3-iodobutene), but in (E)-3-Chloro-4-fluoro-7-methyloct-3-en-5-yne the Cl and F are on opposite sides of the double bond, and the E- therefore indicates t...
by Tram Ha 3I
Sun Feb 21, 2016 9:43 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Electron Transfers in reaction mechanism
Replies: 1
Views: 291

Re: Electron Transfers in reaction mechanism

We draw the electron movement from the bond, not from the atom itself. The atom shares its electron with another electron from another atom/molecule to form a bond, so electrons (2 in a bond) come from the bond.
by Tram Ha 3I
Sun Feb 21, 2016 9:30 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 2
Views: 321

Re: Catalysts

Catalyst is not a reagent, nor a product. It just acts as a substance that speeds up a reaction, not another reactant that can be consumed. A catalyst can be used over and over until it is denatured/destroyed.
by Tram Ha 3I
Mon Feb 08, 2016 12:18 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Ranking substances by entropy
Replies: 2
Views: 1105

Re: Ranking substances by entropy

I think if two substances are in the same state, the number of different microstates determine which molecule has more molar entropy. Using the Boltzmann's formula S= klnW, we can set W=m^n, where m= the number of orientations a molecule can have, and n= the number of atoms in a molecule (ex. one mo...
by Tram Ha 3I
Sun Jan 31, 2016 11:29 pm
Forum: Calculating Work of Expansion
Topic: Ideal Gases Formula
Replies: 1
Views: 329

Re: Ideal Gases Formula

It's because we apply the initial and final pressures according to Boyle's law. Boyle's law says that pressure is inversely proportional to volume: as the pressure of the system increases, its volume decreases. So we have V1P1 = V2P2. From this equation we get V2/V1 = P1/P2
by Tram Ha 3I
Mon Jan 25, 2016 1:06 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hw. 8.117
Replies: 1
Views: 246

Hw. 8.117

One step in the production of hydrogen as a fuel is the reaction of methane with water vapor: CH4(g) + H2O(g)----> CO2(g) + 3 H2(g)    Delta H = 318 kJ What is the change in internal energy for the production of 1.00 mol H2? I know that delta U= delta H- Px delta V and Px delta V is equal to delta ...
by Tram Ha 3I
Sun Jan 24, 2016 11:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Hw. 8.103
Replies: 1
Views: 299

Hw. 8.103

Calculate the molar kinetic energy (in joules per mole) of Kr(g) at (a) 55.85 C and (b) 54.85 C. How do I know when the molar kinetic energy is 3/2 RT or 5/2 R/T? Is it always true that the molar KE of monoatomic gases is 3/2 RT and molar KE of diatomic gases is 5/2 RT? What if the molecule is mor...
by Tram Ha 3I
Sun Jan 17, 2016 8:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz #1 Workbook
Replies: 2
Views: 455

Quiz #1 Workbook

If we don't have the chemistry workbook, can we write down the questions and answers on a piece of paper and turn it in instead?
by Tram Ha 3I
Sun Jan 10, 2016 7:52 pm
Forum: Phase Changes & Related Calculations
Topic: Self-Test 8.9B
Replies: 1
Views: 342

Self-Test 8.9B

The same heater was used to heat a 23-g sample of ethanol, C2H5OH, to its boiling point. It was found that 22 kJ was required to vaporize all the ethanol. What is the enthalpy of vaporization of ethanol at its boiling point? I don't know how to apply delta Hvap= H(vapor)- H(liquid) to solve this pro...

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