Search found 11 matches

by ziyistephaniehuang2A
Mon Mar 07, 2016 9:02 pm
Forum: *Alcohols
Topic: Tert-Butanol
Replies: 1
Views: 348

Re: Tert-Butanol

Actually the Carbon atom that OH is connected to is a tertiary Carbon atom, as it is C2 of the parent chain and with a substituent CH3.
by ziyistephaniehuang2A
Wed Mar 02, 2016 4:46 pm
Forum: *Alkanes
Topic: Condensed formulas
Replies: 1
Views: 346

Re: Condensed formulas

If it is harder for you to determine the names from condensed formulas, i suggest you to draw out the molecules. Even though it is more time consuming, it can help you to avoid mistakes. I usually draw out the molecules too to check the names.
by ziyistephaniehuang2A
Tue Feb 23, 2016 9:12 am
Forum: *Alkanes
Topic: Saturated vs unsaturated fats
Replies: 3
Views: 1390

Re: Saturated vs unsaturated fats

Saturated fats are solid under room temperature and unsaturated fats are liquids under room temperature is due the fact that saturated fats has greater intermolecular force and thus higher melting point. Saturated fats contain only singles bonds, so their structures are straight Carbon chains. The m...
by ziyistephaniehuang2A
Wed Feb 17, 2016 4:35 pm
Forum: Zero Order Reactions
Topic: Zero Order
Replies: 2
Views: 407

Re: Zero Order

You can't determine what is the order of the reaction directly from the given equation. The only way to know the order is from the plot. Since here the concentration of the reaction vs. Time gives a straight line, it is zero order.
by ziyistephaniehuang2A
Fri Feb 12, 2016 3:34 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm Question of cell potential
Replies: 3
Views: 443

Re: Midterm Question of cell potential

Cell potential depends on the concentration of the reactants and products. According to the equation we used to calculate E, E actually depends on Q(reactant quotient). Since the electrode is solid, it's mass does not affect Q, and thus does not affect E.
by ziyistephaniehuang2A
Fri Feb 05, 2016 6:11 pm
Forum: General Rate Laws
Topic: 2nd order Integrated Rate Law Graph
Replies: 1
Views: 347

Re: 2nd order Integrated Rate Law Graph

For the integrated rate law graph, the x-axis is always time. However, different from the first order integrated rate law graph, the y-axis of the 2nd order one is one over [A]. And the graph will be a straight line with positive slope k.
by ziyistephaniehuang2A
Thu Jan 28, 2016 5:14 pm
Forum: Balancing Redox Reactions
Topic: oxidize or reduce?
Replies: 2
Views: 706

Re: oxidize or reduce?

I agree with the previous reply that because E is negative, the reaction is not favorable. Also, Zn2+ is a weak oxidizing agent and lead is a weak reducing agent (you can check the half reaction table online). This means that it is not possible for Pb to reduce Zn2+ to Zn.
by ziyistephaniehuang2A
Sat Jan 23, 2016 10:04 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 2
Views: 346

Re: Gibbs Free Energy

Hi,

If change in entropy of the universe is positive, then it must be a spontaneous reaction. Since change in Gibbs Free Energy = - change in entropy of universe (Delta G= - Delta Universe) (Page 38 of the course reader), only change in Gibbs free energy is negative, then the reaction is spontaneous.
by ziyistephaniehuang2A
Sun Jan 17, 2016 4:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Clarification on Heat Capacity and Specific Heat Capacity
Replies: 3
Views: 579

Re: Clarification on Heat Capacity and Specific Heat Capacit

Hi,
For specific heat capacity, each substance, e.g.water, has its own specific heat capacity that you need to memorize when doing calculation. This value does not change no matter how much water is given.
by ziyistephaniehuang2A
Sun Jan 17, 2016 4:21 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: quiz??
Replies: 3
Views: 632

Re: quiz??

Hi,

It covers everything from thermochemistry to the end of thermodynamics. (including Hoff equation)
by ziyistephaniehuang2A
Sun Jan 10, 2016 2:45 am
Forum: Phase Changes & Related Calculations
Topic: phase change
Replies: 3
Views: 417

Re: phase change

Some phase change reactions such as ice melting into water or water changes into steam are endothermic reactions, which means they absorb heat. When temperature increases, extra heat is used to break the bonds inside the molecules, which leads to phase change. Thus, since heat is absorbed to break b...

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