Search found 33 matches

by Sarah 2F
Sat Mar 17, 2018 10:51 am
Forum: General Rate Laws
Topic: Unimolecular
Replies: 5
Views: 357

Re: Unimolecular

It corresponds to the number of molecules in the reactants.
by Sarah 2F
Sat Mar 17, 2018 10:49 am
Forum: First Order Reactions
Topic: Slope of 1st order RXNs
Replies: 9
Views: 430

Re: Slope of 1st order RXNs

slope is -k
by Sarah 2F
Sat Mar 17, 2018 10:48 am
Forum: General Rate Laws
Topic: Units
Replies: 11
Views: 578

Re: Units

Do the units that are most consistent with your problem (after canceling out and such)
by Sarah 2F
Fri Mar 09, 2018 10:34 pm
Forum: General Rate Laws
Topic: rate constants
Replies: 7
Views: 278

Re: rate constants

They calculate the speed of the reaction
by Sarah 2F
Fri Mar 09, 2018 7:02 pm
Forum: General Rate Laws
Topic: Rate Constant k
Replies: 6
Views: 245

Re: Rate Constant k

instantaneous rate of change
by Sarah 2F
Wed Mar 07, 2018 2:42 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units of k
Replies: 8
Views: 330

Re: Units of k

It is different for each reaction order
by Sarah 2F
Wed Mar 07, 2018 2:14 pm
Forum: General Rate Laws
Topic: Test 3 - Derivations
Replies: 4
Views: 202

Re: Test 3 - Derivations

Yes we should know them!
by Sarah 2F
Wed Mar 07, 2018 2:12 pm
Forum: General Rate Laws
Topic: Temperature Signifcance
Replies: 4
Views: 183

Re: Temperature Signifcance

The temperature is usually there but not used.
by Sarah 2F
Wed Mar 07, 2018 2:11 pm
Forum: General Rate Laws
Topic: Proper units
Replies: 7
Views: 268

Re: Proper units

It would put it in moles just to be safe but as long as the units cancel out you should be fine
by Sarah 2F
Thu Mar 01, 2018 4:52 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units
Replies: 7
Views: 545

Re: Units

Usually seconds should be the one being used.
by Sarah 2F
Thu Mar 01, 2018 4:49 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics vs Thermodynamics
Replies: 7
Views: 294

Re: Kinetics vs Thermodynamics

Kinetics is about the journey there and Thermodynamics is only about the beginning and end products.
by Sarah 2F
Thu Mar 01, 2018 4:47 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetically Stable Vs. Thermodynamically Stable
Replies: 4
Views: 610

Re: Kinetically Stable Vs. Thermodynamically Stable

Kinetically stable: Things that make the rate of reaction slower
Thermodynamically stable: Things with lower energy
by Sarah 2F
Mon Feb 19, 2018 4:04 pm
Forum: Balancing Redox Reactions
Topic: Half-Reactions on Test 2
Replies: 5
Views: 214

Re: Half-Reactions on Test 2

we will have a list I believe
by Sarah 2F
Mon Feb 19, 2018 4:04 pm
Forum: Balancing Redox Reactions
Topic: "Rules"
Replies: 7
Views: 272

Re: "Rules"

You add the H20 first and then do the rest of the balancing
by Sarah 2F
Mon Feb 19, 2018 4:03 pm
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 3
Views: 156

Re: Test 2

The list is on the website!
by Sarah 2F
Mon Feb 12, 2018 1:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 11
Views: 552

Re: closed vs isolated

You can only assume that if the problem says so.
by Sarah 2F
Mon Feb 12, 2018 1:18 pm
Forum: Phase Changes & Related Calculations
Topic: Environmental impact?
Replies: 6
Views: 447

Re: Environmental impact?

Agreed with the others but probably just the heat change from surroundings and system and such.
by Sarah 2F
Mon Feb 12, 2018 1:16 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work not a state function [ENDORSED]
Replies: 2
Views: 162

Re: Work not a state function [ENDORSED]

It is because the path taken to the end matters. State functions only need the final and the initial points.
by Sarah 2F
Mon Feb 05, 2018 2:57 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Question: Refrigerator Cooling
Replies: 3
Views: 160

Re: Question: Refrigerator Cooling

The fridge is a small part of the room and thus the temperature of the fridge does not necessarily affect the temperature of the whole room. Like the person above: lighting a match does not make the whole surrounding warmer.
by Sarah 2F
Mon Feb 05, 2018 2:48 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question 3b on the test
Replies: 4
Views: 217

Re: Question 3b on the test

Temperature is increasing because the volume and pressure is changing in the balloon. The temperature may be the same but because of the change in P and V a little bit goes in and out so the temperature in the end is no change.
by Sarah 2F
Mon Feb 05, 2018 2:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Heat transfer
Replies: 7
Views: 272

Re: Heat transfer

Heat is being transferred because pressure and volume are changing. Even though the temperature is constant, that is because the changing temperature evens out and becomes non changing even though its gaining some and losing some from the pressure and volume change.
by Sarah 2F
Tue Jan 30, 2018 11:46 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open System
Replies: 7
Views: 333

Re: Open System

1. Add or subtract matter
2. Add or subtract heat
3. do work on it
by Sarah 2F
Tue Jan 30, 2018 11:45 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: unit of entropy
Replies: 11
Views: 358

Re: unit of entropy

(j/k)
by Sarah 2F
Tue Jan 30, 2018 11:41 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.5 [ENDORSED]
Replies: 11
Views: 454

Re: Homework 9.5 [ENDORSED]

You can see that the system is losing heat so you add a negative to the reaction!
by Sarah 2F
Thu Jan 25, 2018 9:57 am
Forum: Phase Changes & Related Calculations
Topic: Closed Systems [ENDORSED]
Replies: 8
Views: 483

Re: Closed Systems [ENDORSED]

In a closed system you can add or subtract heat or do work to it since energy can pass through.
by Sarah 2F
Thu Jan 25, 2018 9:55 am
Forum: Phase Changes & Related Calculations
Topic: Heat and Work relation
Replies: 6
Views: 256

Re: Heat and Work relation

In that equation q and w are separate so they don't directly affect each other since they are calculated separately.
by Sarah 2F
Thu Jan 25, 2018 9:53 am
Forum: Phase Changes & Related Calculations
Topic: Heat capacities
Replies: 5
Views: 199

Re: Heat capacities

You use the temperature of whichever unit is given in that constant but I believe if it is a delta T then you can use them interchangeably.
by Sarah 2F
Mon Jan 15, 2018 9:16 pm
Forum: Phase Changes & Related Calculations
Topic: Types of Systems
Replies: 10
Views: 437

Re: Types of Systems

An isolated system doesn't let anything in or out like a really good thermos but a closed system allows things of matter to pass such as heat. An example of a closed system is mercury in a thermometer.
by Sarah 2F
Mon Jan 15, 2018 9:09 pm
Forum: Phase Changes & Related Calculations
Topic: Open/Closed/Isolated
Replies: 11
Views: 402

Re: Open/Closed/Isolated

I would say that it is a closed system when the lid is closed but an open system when the lid is not on.
by Sarah 2F
Mon Jan 15, 2018 8:47 pm
Forum: Phase Changes & Related Calculations
Topic: What does it mean when a gas expands reversibly and isothermally?
Replies: 1
Views: 95

What does it mean when a gas expands reversibly and isothermally?

What does it mean when a gas expands reversibly and isothermally? Came upon this question while doing the chapter 8 homework #11. Also why does a reversible reaction do more work?
by Sarah 2F
Wed Jan 10, 2018 7:29 pm
Forum: Phase Changes & Related Calculations
Topic: The Process of Sublimation [ENDORSED]
Replies: 2
Views: 177

Re: The Process of Sublimation [ENDORSED]

Adding to the response above, an easy way to think of sublimation is dry ice since it goes directly from a solid to a gas.
by Sarah 2F
Wed Jan 10, 2018 7:27 pm
Forum: Phase Changes & Related Calculations
Topic: Reaction in a Flask
Replies: 5
Views: 265

Re: Reaction in a Flask

Endothermic reactions feel cold because it is taking energy from the surroundings. Your hand may be a part of the surroundings and so if you become in contact with it, it will feel cool because it is taking energy/heat from your hand into its system. This is why endothermic reactions feel cold.
by Sarah 2F
Wed Jan 10, 2018 7:19 pm
Forum: Phase Changes & Related Calculations
Topic: Endo and Exothermic Ways to Remember
Replies: 28
Views: 3060

Re: Endo and Exothermic Ways to Remember

I usually remember it with words similar to it such as "endo" as enter = heat entering the system and "exo" as exit = heat escaping the system.

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