## Search found 32 matches

Tue Mar 12, 2019 10:08 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step
Replies: 6
Views: 145

### 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: 106

### 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: 346

### Re: Closed vs Isolated

Isolated: Thermos, calorimeter, universe
Closed: coffee cup with lid, a grill
Tue Mar 12, 2019 10:05 am
Forum: General Rate Laws
Topic: Derivations
Replies: 3
Views: 93

### 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: 127

### 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: 90

### Re: H2O in Cell Diagrams

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: 181

### 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: 63

### 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.
Thu Feb 28, 2019 12:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: "Strongly oxidizing"
Replies: 5
Views: 195

### 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: 107

### 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: 111

### 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: 42

### 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: 53

### 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)
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: 66

### 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: 62

### 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.
Sat Feb 23, 2019 4:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Homework
Replies: 3
Views: 95

### 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: 283

### 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: 80

### 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: 103

### Re: Phase Changes

q= m deltaH

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: 114

### 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: 118

### 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: 104

### 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.
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: 82

### 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: 721

### 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: 134

### 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: 146

### 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: 142

### 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: 207

### 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: 89

### 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: 61

### 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: 176

### 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: 176

### 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.