Search found 32 matches
- Tue Mar 12, 2019 10:08 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow Step
- Replies: 6
- Views: 488
Re: Slow Step
The slow step should be given to us.
- Tue Mar 12, 2019 10:07 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: slow step and fast step
- Replies: 3
- Views: 362
Re: slow step and fast step
The slow step is the rate-determining step.
- Tue Mar 12, 2019 10:07 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed vs Isolated
- Replies: 5
- Views: 1134
Re: Closed vs Isolated
Isolated: Thermos, calorimeter, universe
Closed: coffee cup with lid, a grill
Closed: coffee cup with lid, a grill
- Tue Mar 12, 2019 10:05 am
- Forum: General Rate Laws
- Topic: Derivations
- Replies: 3
- Views: 336
Re: Derivations
No, just know where they come from and how.
- Tue Mar 12, 2019 10:04 am
- Forum: General Rate Laws
- Topic: Zero Order Reactions
- Replies: 4
- Views: 371
Re: Zero Order Reactions
In zero order, the rate only depends on k. The concentration does not affect the rate.
- Thu Feb 28, 2019 12:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: H2O in Cell Diagrams
- Replies: 4
- Views: 396
Re: H2O in Cell Diagrams
Aqueous implies H20 already.
- Thu Feb 28, 2019 12:50 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: speed of reaction based on activation energy
- Replies: 6
- Views: 617
Re: speed of reaction based on activation energy
It is because since you need more energy to build up, the longer it takes to acquire the energy for the reaction to take place.
- Thu Feb 28, 2019 12:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram notation
- Replies: 2
- Views: 201
Re: Cell Diagram notation
A comma separates molecules of the SAME phase.
A single line | separates molecules of different phases.
A double line || separates the electrodes.
A single line | separates molecules of different phases.
A double line || separates the electrodes.
- Thu Feb 28, 2019 12:40 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: "Strongly oxidizing"
- Replies: 5
- Views: 980
Re: "Strongly oxidizing"
It means Cu2+ is a stronger oxidizing agent which means it has a high E reduction potential.
- Tue Feb 26, 2019 3:50 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Rules for Redox Reactions
- Replies: 3
- Views: 330
Re: Balancing Rules for Redox Reactions
In acidic solutions, add H20 to balance oxygen atoms, and add H+ to balance hydrogen atoms.
- Tue Feb 26, 2019 3:15 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing and Reducing Agent
- Replies: 4
- Views: 385
Re: Oxidizing and Reducing Agent
Yes, it's called a disproportionation reaction (when an element is both being oxidized and reduced).
- Tue Feb 26, 2019 3:13 pm
- Forum: Balancing Redox Reactions
- Topic: balancing basic half reactions
- Replies: 1
- Views: 218
Re: balancing basic half reactions
You have to balance the H20 with H+ on the other side, but since it's a basic solution, you have to add OH- to the side you added H+ to, which then just becomes H2O.
- Tue Feb 26, 2019 3:09 pm
- Forum: Balancing Redox Reactions
- Topic: oxidized vs oxidizing agent
- Replies: 3
- Views: 267
Re: oxidized vs oxidizing agent
Oxidized: losing electrons
Oxidizing agent: the molecule that is doing the oxidation, also the one that is being reduced (gaining electrons)
Oxidizing agent: the molecule that is doing the oxidation, also the one that is being reduced (gaining electrons)
- Sat Feb 23, 2019 5:26 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs Free Energy and Pressure and K
- Replies: 2
- Views: 310
Gibbs Free Energy and Pressure and K
How does pressure and the equilibrium constant affect Gibbs Free Energy?
- Sat Feb 23, 2019 4:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 2
- Views: 257
Re: Cell Diagram
The comma separates those in the same phase whereas the single line separates those of different states (ie (s)|(aq)).
The double line separates the electrodes.
The double line separates the electrodes.
- Sat Feb 23, 2019 4:40 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Homework
- Replies: 3
- Views: 352
Homework
Is there going to be homework due this week?
- Sat Feb 23, 2019 4:40 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: test 3
- Replies: 10
- Views: 931
test 3
What is going to be on Test 3?
- Sat Feb 23, 2019 4:38 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Units
- Replies: 4
- Views: 334
Re: Units
J/mol or kJ/mol
- Sat Feb 23, 2019 4:31 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 3
- Views: 347
Re: Phase Changes
q= m deltaH
heat = mass x enthalpy of fusion/vap
heat = mass x enthalpy of fusion/vap
- Fri Feb 01, 2019 2:46 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Finding Heat
- Replies: 4
- Views: 391
Re: Finding Heat
You can use it interchangeably since q=mCdeltaT asks for the CHANGE in temperature so the change in celsius is the same as the change in K.
- Fri Feb 01, 2019 2:42 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Engine and Body Open system
- Replies: 3
- Views: 338
Re: Engine and Body Open system
yes because they exchange matter and energy with its surroundings.
- Fri Feb 01, 2019 2:37 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work Done By vs. On
- Replies: 4
- Views: 273
Re: Work Done By vs. On
Done on is + (positive), because the surroundings are releasing energy for the system to absorb the energy.
Done by is - (negative), because the system has to use their energy which results in a release which is negative.
Done by is - (negative), because the system has to use their energy which results in a release which is negative.
- Fri Feb 01, 2019 2:35 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Phase changes and enthaplies
- Replies: 3
- Views: 348
Re: Phase changes and enthaplies
Enthalpy is the heat absorbed/released in a reaction. Phase changes are a physical reactions so they also have enthalpies.
- Fri Feb 01, 2019 2:33 pm
- Forum: Ideal Gases
- Topic: pV=nRT
- Replies: 12
- Views: 1989
Re: pV=nRT
The ideal gas law demonstrates the relationships between pressure, volume, moles, and temperature. It is crucial to finding different values.
- Fri Feb 01, 2019 2:26 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Universe as a Thermodynamic System
- Replies: 2
- Views: 2650
Re: Universe as a Thermodynamic System
A type of system is determined depending on whether it exchanges matter and energy with the surroundings. Since there's no surroundings around the universe, there's no exchange of matter and energy which makes it isolated.
- Fri Feb 01, 2019 2:23 pm
- Forum: Phase Changes & Related Calculations
- Topic: PΔV of Solids and Liquids
- Replies: 4
- Views: 443
Re: PΔV of Solids and Liquids
Solids and liquids do not undergo compressions or expansions which makes their volume change zero.
- Fri Feb 01, 2019 2:20 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated Systems
- Replies: 6
- Views: 722
Re: Isolated Systems
It is determined whether the system exchanges matter and energy with the surroundings. Since there's no surroundings around the universe, it's isolated.
- Mon Jan 14, 2019 4:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acids and Bases
- Replies: 7
- Views: 799
Re: Acids and Bases
We had to memorize our Strong Acids and Bases which are HCl - hydrochloric acid HNO3 - nitric acid H2SO4 - sulfuric acid (HSO4- is a weak acid) HBr - hydrobromic acid HI - hydroiodic acid HClO4 - perchloric acid HClO3 - chloric acid. Potassium hydroxide (KOH) Sodium hydroxide (NaOH) Barium hydroxide...
- Mon Jan 14, 2019 4:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kw
- Replies: 2
- Views: 246
Re: Kw
a pH of 7 is neutral. Water at room temperature (25C) has a pH of 7, however depending on the temperature change, the pH can slightly increase or decrease. For example, when you boil water the pH slightly decreases (more acidic) due to the increase of ionization.
- Fri Jan 11, 2019 3:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Charles’s Law
- Replies: 4
- Views: 191
Re: Charles’s Law
Basically V1/T1 = V2 / T2
- Fri Jan 11, 2019 3:34 pm
- Forum: Ideal Gases
- Topic: Reaction Quotient
- Replies: 6
- Views: 369
Re: Reaction Quotient
Both solids and liquids are pure so they don't have a concentration. Having no concentration means they are not included in the calculations of K or Q.
- Fri Jan 11, 2019 3:33 pm
- Forum: Ideal Gases
- Topic: Reaction Quotient
- Replies: 6
- Views: 369
Re: Reaction Quotient
Both solids and liquids are pure so they don't have a concentration. Having no concentration means they are not included in the calculations of K or Q.