Search found 29 matches

by Joyce Gu 1E
Sat Mar 17, 2018 11:17 pm
Forum: Student Social/Study Group
Topic: Final Review Time Tips
Replies: 5
Views: 404

Re: Final Review Time Tips

Bill Phawn 2C wrote:Where can I find the old tests?


if you know anyone who has lavelle's course reader, there should be old tests included in it
by Joyce Gu 1E
Sat Mar 17, 2018 11:11 pm
Forum: General Rate Laws
Topic: Units
Replies: 11
Views: 578

Re: Units

i think it helps to just be consistent with the problem! i notice that i sometimes get lost along the way when i don't convert and forget what to cancel out
by Joyce Gu 1E
Sat Mar 17, 2018 11:05 pm
Forum: *Electrophiles
Topic: what is going to be on the final? [ENDORSED]
Replies: 12
Views: 843

Re: what is going to be on the final? [ENDORSED]

Matthew 1C wrote:
Joyce Gu 1E wrote:where can i find this practice final?

search red panda and you'll find it!


oh riiight.. thanks so much!
by Joyce Gu 1E
Sat Mar 17, 2018 11:01 pm
Forum: *Electrophiles
Topic: what is going to be on the final? [ENDORSED]
Replies: 12
Views: 843

Re: what is going to be on the final? [ENDORSED]

where can i find this practice final?
by Joyce Gu 1E
Sat Mar 17, 2018 10:42 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Transition State
Replies: 3
Views: 265

Re: Transition State

the transition state is the point where there is a maximum value of activation energy, so it should always be the peak
by Joyce Gu 1E
Sat Mar 17, 2018 10:05 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Concept of Second Law of Thermodynamics
Replies: 6
Views: 380

Re: Concept of Second Law of Thermodynamics

In any cyclic process, the entropy will either increase or remain the same
by Joyce Gu 1E
Sat Mar 17, 2018 9:35 pm
Forum: *Alkanes
Topic: Final
Replies: 13
Views: 1183

Re: Final

i would try to remember the halogens (fluorine, chlorine, bromine, iodine, and astatine) as well, just in case
by Joyce Gu 1E
Sat Mar 17, 2018 9:15 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat capacity of liquid
Replies: 1
Views: 197

Re: Heat capacity of liquid

i wondered the same thing, and this helped me understand better: https://www.physicsforums.com/threads/s ... st.131151/
by Joyce Gu 1E
Sat Mar 17, 2018 8:50 pm
Forum: General Rate Laws
Topic: general calc
Replies: 1
Views: 288

Re: general calc

it depends on what kind of calculator you use, i use this function on my calculator
by Joyce Gu 1E
Sat Mar 17, 2018 8:37 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Catalyst and Intermediate
Replies: 5
Views: 310

Re: Catalyst and Intermediate

yes, they can show up in the same reaction, but just don't show up in the end product
by Joyce Gu 1E
Sat Mar 17, 2018 8:29 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Problem
Replies: 1
Views: 105

Re: Problem

i dont think so, because the forward and reverse reactions are just the reactants and products and we're usually given both
by Joyce Gu 1E
Sat Mar 17, 2018 8:25 pm
Forum: Calculating Work of Expansion
Topic: irreversible reactions
Replies: 4
Views: 308

Re: irreversible reactions

A reversible process is at equilibrium and energy can move back and forth. An irreversible system is a process that cannot be reversed by an infinitesimal change in a variable.
by Joyce Gu 1E
Sat Mar 17, 2018 8:20 pm
Forum: Calculating Work of Expansion
Topic: work done on and by the system
Replies: 12
Views: 565

Re: work done on and by the system

Bansi Amin 1D wrote:When given a word problem, how can we tell that work is being done on the system or by the system?


Work to system --> -w
Work from system --> +w
by Joyce Gu 1E
Sat Mar 17, 2018 7:55 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 7
Views: 625

Re: Steam

So water in liquid form boils, and at 100 degrees celsius (boiling point), it turns to steam. The steam can then continue to be heated.
by Joyce Gu 1E
Sat Mar 17, 2018 7:29 pm
Forum: *Alcohols
Topic: study tips
Replies: 3
Views: 758

Re: study tips

not mnemonic devices but this may help? https://www.youtube.com/watch?v=WCm3oIzfdo8
by Joyce Gu 1E
Sat Mar 17, 2018 7:21 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Rate Constants and Temperature
Replies: 3
Views: 215

Re: Rate Constants and Temperature

yes, the Arrhenius equation (k = A exp( -EA/RT )
by Joyce Gu 1E
Sat Mar 17, 2018 7:15 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Increasing Concentration of Reactants
Replies: 5
Views: 305

Re: Increasing Concentration of Reactants

yes, because the frequency of collisions between the two reactants will increase if the concentration increases
by Joyce Gu 1E
Sat Mar 17, 2018 7:10 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta g equilibrium
Replies: 2
Views: 205

Re: delta g equilibrium

Yes, because ΔG = ΔG° + RTln(Q). If ΔG = 0, 0 = ΔG° + RTln(Q), ΔG° = -RTln(Q) = -RTln(K), Q=K means at equilibrium
by Joyce Gu 1E
Sat Mar 17, 2018 6:59 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic or Exothermic
Replies: 20
Views: 562

Re: Endothermic or Exothermic

condensation is an exothermic process because the water vapor molecules lose energy as heat
by Joyce Gu 1E
Sat Mar 17, 2018 6:55 pm
Forum: Phase Changes & Related Calculations
Topic: Constant Volume
Replies: 3
Views: 230

Re: Constant Volume

yes, because is possible to do work on a system without changing the volume
by Joyce Gu 1E
Sat Mar 17, 2018 6:12 pm
Forum: Balancing Redox Reactions
Topic: Adding OH
Replies: 6
Views: 330

Adding OH

When balancing redox reactions, how do you know when to add OH?
by Joyce Gu 1E
Sat Mar 17, 2018 5:49 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Rate Constant [ENDORSED]
Replies: 2
Views: 230

Rate Constant [ENDORSED]

When looking at a reaction graph, how do you determine the greatest rate constant?
by Joyce Gu 1E
Sat Mar 17, 2018 5:48 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Graphs
Replies: 3
Views: 243

Reaction Graphs

When looking at a reaction graph, how do you determine which reactants have the smallest/greatest rate in the forward/reverse direction?
by Joyce Gu 1E
Sat Mar 17, 2018 5:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Adiabatic System
Replies: 5
Views: 442

Adiabatic System

Since is no entropy change in an adiabatic process, there is no heat being transferred. Would that mean that an adiabatic process is always considered reversible?
by Joyce Gu 1E
Sat Mar 17, 2018 5:24 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Gas Expansion
Replies: 1
Views: 173

Gas Expansion

If ΔU=0, why would gas expand?
by Joyce Gu 1E
Sat Mar 17, 2018 5:07 pm
Forum: Calculating Work of Expansion
Topic: Free energy and work
Replies: 3
Views: 216

Re: Free energy and work

Well when we refer to Gibbs Free Energy (G), its just the energy that is free to do useful work. So the change in Gibbs Free Energy (ΔG) is equal to the maximum amount of work done by a process at constant temperature and pressure (ΔG=[W]max).
by Joyce Gu 1E
Sat Mar 17, 2018 5:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems
Replies: 3
Views: 243

Re: Isolated Systems

I think so because an isolated system is a closed system that cannot exchange energy with the surroundings, so I would assume that the system's volume remains constant.

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