Search found 33 matches
- Sat Mar 17, 2018 10:51 am
- Forum: General Rate Laws
- Topic: Unimolecular
- Replies: 5
- Views: 460
Re: Unimolecular
It corresponds to the number of molecules in the reactants.
- Sat Mar 17, 2018 10:49 am
- Forum: First Order Reactions
- Topic: Slope of 1st order RXNs
- Replies: 9
- Views: 632
Re: Slope of 1st order RXNs
slope is -k
- Sat Mar 17, 2018 10:48 am
- Forum: General Rate Laws
- Topic: Units
- Replies: 11
- Views: 777
Re: Units
Do the units that are most consistent with your problem (after canceling out and such)
- Fri Mar 09, 2018 10:34 pm
- Forum: General Rate Laws
- Topic: rate constants
- Replies: 7
- Views: 443
Re: rate constants
They calculate the speed of the reaction
- Fri Mar 09, 2018 7:02 pm
- Forum: General Rate Laws
- Topic: Rate Constant k
- Replies: 6
- Views: 412
Re: Rate Constant k
instantaneous rate of change
- Wed Mar 07, 2018 2:42 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Units of k
- Replies: 8
- Views: 671
Re: Units of k
It is different for each reaction order
- Wed Mar 07, 2018 2:14 pm
- Forum: General Rate Laws
- Topic: Test 3 - Derivations
- Replies: 4
- Views: 304
Re: Test 3 - Derivations
Yes we should know them!
- Wed Mar 07, 2018 2:12 pm
- Forum: General Rate Laws
- Topic: Temperature Signifcance
- Replies: 4
- Views: 268
Re: Temperature Signifcance
The temperature is usually there but not used.
- Wed Mar 07, 2018 2:11 pm
- Forum: General Rate Laws
- Topic: Proper units
- Replies: 7
- Views: 448
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
- Thu Mar 01, 2018 4:52 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Units
- Replies: 7
- Views: 703
Re: Units
Usually seconds should be the one being used.
- Thu Mar 01, 2018 4:49 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics vs Thermodynamics
- Replies: 7
- Views: 464
Re: Kinetics vs Thermodynamics
Kinetics is about the journey there and Thermodynamics is only about the beginning and end products.
- Thu Mar 01, 2018 4:47 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetically Stable Vs. Thermodynamically Stable
- Replies: 4
- Views: 992
Re: Kinetically Stable Vs. Thermodynamically Stable
Kinetically stable: Things that make the rate of reaction slower
Thermodynamically stable: Things with lower energy
Thermodynamically stable: Things with lower energy
- Mon Feb 19, 2018 4:04 pm
- Forum: Balancing Redox Reactions
- Topic: Half-Reactions on Test 2
- Replies: 5
- Views: 329
Re: Half-Reactions on Test 2
we will have a list I believe
- Mon Feb 19, 2018 4:04 pm
- Forum: Balancing Redox Reactions
- Topic: "Rules"
- Replies: 7
- Views: 394
Re: "Rules"
You add the H20 first and then do the rest of the balancing
- Mon Feb 19, 2018 4:03 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2
- Replies: 3
- Views: 246
Re: Test 2
The list is on the website!
- Mon Feb 12, 2018 1:22 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed vs isolated
- Replies: 11
- Views: 752
Re: closed vs isolated
You can only assume that if the problem says so.
- Mon Feb 12, 2018 1:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: Environmental impact?
- Replies: 6
- Views: 568
Re: Environmental impact?
Agreed with the others but probably just the heat change from surroundings and system and such.
- 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: 260
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.
- Mon Feb 05, 2018 2:57 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Question: Refrigerator Cooling
- Replies: 3
- Views: 242
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.
- Mon Feb 05, 2018 2:48 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Question 3b on the test
- Replies: 4
- Views: 313
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.
- Mon Feb 05, 2018 2:46 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat transfer
- Replies: 7
- Views: 374
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.
- Tue Jan 30, 2018 11:46 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open System
- Replies: 7
- Views: 672
Re: Open System
1. Add or subtract matter
2. Add or subtract heat
3. do work on it
2. Add or subtract heat
3. do work on it
- Tue Jan 30, 2018 11:45 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: unit of entropy
- Replies: 11
- Views: 563
Re: unit of entropy
(j/k)
- Tue Jan 30, 2018 11:41 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Homework 9.5 [ENDORSED]
- Replies: 11
- Views: 631
Re: Homework 9.5 [ENDORSED]
You can see that the system is losing heat so you add a negative to the reaction!
- Thu Jan 25, 2018 9:57 am
- Forum: Phase Changes & Related Calculations
- Topic: Closed Systems [ENDORSED]
- Replies: 8
- Views: 643
Re: Closed Systems [ENDORSED]
In a closed system you can add or subtract heat or do work to it since energy can pass through.
- Thu Jan 25, 2018 9:55 am
- Forum: Phase Changes & Related Calculations
- Topic: Heat and Work relation
- Replies: 6
- Views: 388
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.
- Thu Jan 25, 2018 9:53 am
- Forum: Phase Changes & Related Calculations
- Topic: Heat capacities
- Replies: 5
- Views: 320
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.
- Mon Jan 15, 2018 9:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: Types of Systems
- Replies: 10
- Views: 760
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.
- Mon Jan 15, 2018 9:09 pm
- Forum: Phase Changes & Related Calculations
- Topic: Open/Closed/Isolated
- Replies: 11
- Views: 579
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.
- 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: 138
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?
- Wed Jan 10, 2018 7:29 pm
- Forum: Phase Changes & Related Calculations
- Topic: The Process of Sublimation [ENDORSED]
- Replies: 2
- Views: 233
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.
- Wed Jan 10, 2018 7:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: Reaction in a Flask
- Replies: 5
- Views: 610
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.
- Wed Jan 10, 2018 7:19 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endo and Exothermic Ways to Remember
- Replies: 28
- Views: 5615
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.