## Search found 26 matches

Sun Mar 17, 2019 10:58 pm
Forum: Calculating Work of Expansion
Topic: Work in a System
Replies: 4
Views: 264

### Re: Work in a System

Also in Free Expansion, w is equal to 0. In this case, deltaH will also be equal to H.
Sun Mar 17, 2019 10:54 pm
Forum: First Order Reactions
Topic: Slopes of a plot
Replies: 7
Views: 602

### Re: Slopes of a plot

Zero Order also has a negative slope. Think of the equations as mx+b. The Slope (mx) is similar to kt in the order process formulas.
Sun Mar 17, 2019 10:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1173398

### Re: Post All Chemistry Jokes Here

"I initially decided to write jokes about the Periodic Table, but never really felt I was in my element."
Sun Mar 17, 2019 10:49 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta h and q
Replies: 3
Views: 496

### Re: delta h and q

delta h is related to q when work is not involved and there is a constant pressure.
Sun Mar 17, 2019 10:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1173398

### Re: Post All Chemistry Jokes Here

"In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race. When the chemical kinetics specialist is asked why he ran slowly, his reply was 'I always wanted to be the significant rate determining step.'
Sun Mar 17, 2019 10:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: HW 7E.7
Replies: 1
Views: 289

### Re: HW 7E.7

For C, I believe its true because a catalyst just lowers the activation energy but it does not change the pathway.
Sun Mar 17, 2019 10:41 pm
Forum: General Science Questions
Topic: ATP Coupling
Replies: 1
Views: 712

### ATP Coupling

What does it mean when ATP hydrolysis is coupled with an element? do you divide the element's gibbs free energy by th ATP's gibbs free energy to get how many molecules are used of ATP?
Sun Mar 17, 2019 10:37 pm
Forum: Phase Changes & Related Calculations
Topic: heating curves
Replies: 4
Views: 842

### Re: heating curves

Typically, we interchange between two reactions for heating curves:
1. q=mc*deltaT (within a phase)
2. q= n*deltah (the change from one phase to another)
Sun Mar 17, 2019 10:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1173398

### Re: Post All Chemistry Jokes Here

If Silver Surfer and Iron Man team up, they'd be alloys.
Sun Mar 17, 2019 10:28 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1173398

### Re: Post All Chemistry Jokes Here

I would tell another chemistry joke...
...but all the good ones Argon.
Sun Mar 17, 2019 10:20 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Bomb Calorimeter
Replies: 5
Views: 572

### Bomb Calorimeter

When a question asks to solve the internal energy of a bomb Calorimeter, do we just assume that delta U is equal to q and thus ignore work?
Sun Mar 17, 2019 10:09 pm
Forum: Experimental Details
Topic: Psuedo First Order
Replies: 4
Views: 496

### Psuedo First Order

What is psuedo first Order and how is it related to the first order process?
Sun Mar 17, 2019 10:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1173398

### Re: Post All Chemistry Jokes Here

"What should you do if no one laughs at your chemistry jokes?"
-"Keep telling them until you get a reaction."
Mon Mar 11, 2019 4:01 pm
Forum: Experimental Details
Topic: Which Experiment to Use
Replies: 3
Views: 240

### Which Experiment to Use

How do you know which experiments to use in order to solve an element's overall order?
Fri Feb 22, 2019 12:51 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Material
Replies: 11
Views: 244

### Test 2 Material

What subjects should we focus on for test 2? I know that we have to study gibbs free energy and balancing redox reactions but what about entropy and enthalpy?
Fri Feb 22, 2019 12:49 pm
Forum: Balancing Redox Reactions
Topic: Voltage and Balancing Redox Equations
Replies: 2
Views: 85

### Voltage and Balancing Redox Equations

Why do you need the largest positive voltage as an answer for half reactions?
Fri Feb 22, 2019 12:43 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 3
Views: 332

### Re: Van't Hoff Equation

According to Lavelle's lecture the Van't Hoff equation "can be used to calculate k [equilibrium] at a different temperature if delta H is known."
The equation is lnk=(-delta h/RT) + (delta S/R). The Detla H and S are both in standard state.
Fri Feb 08, 2019 11:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp vs Cv
Replies: 1
Views: 100

### Re: Cp vs Cv

Cp means constant pressure and Cv means constant volume. They are both associated with molar heat capacity of an ideal gas. Cv=(3/2)(R) and Cp=(5/2)R. R is 8.314J/mol*k
Fri Feb 08, 2019 11:30 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Steam vs. Boiled Water
Replies: 2
Views: 98

### Re: Steam vs. Boiled Water

A heat curve demonstrates that steam has higher heat energy. Even though both vapor and boiling water may have the same temp, additional heat energy is required for the phase change to occur (vaporization). Therefore steam would burn more.
Fri Feb 08, 2019 11:22 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Work Equations
Replies: 2
Views: 110

### Work Equations

What are all the formulas associated to finding work and how do you know which one to use?
Sun Feb 03, 2019 10:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 105

### Re: Hess's Law

For Hess' law, think of it as manipulating equations in order to add up their delta H's. Here is a link to a video that explains it way better than me: https://www.youtube.com/watch?v=2q2u5sj4V00.
Sun Feb 03, 2019 10:45 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant numbers
Replies: 4
Views: 173

### Constant numbers

Are there any constant numbers we have to know for formulas of heat and work? If so, can someone explain them to me. Thank you.
Sun Feb 03, 2019 10:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: qv vs qp
Replies: 9
Views: 294

### Re: qv vs qp

Qv is heat in constant volume and qp is heat in constant pressure. Typically, the questions will ask you specifically which one to solve by.
Thu Jan 17, 2019 11:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc Conversions
Replies: 1
Views: 78

### Kp and Kc Conversions

I was wondering if we have to know how to convert Kp to Kc and vice versa? If so, is there a certain formula that can help convert them. Thank you!
Thu Jan 17, 2019 11:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Help on 12.45
Replies: 1
Views: 59

### Re: Help on 12.45

Since acids and bases follow the conjugate seesaw, I believe that the strongest conjugate acid will tie to the weakest base. I suggest first writing the conjugate acids in increasing order. Then the reverse pattern will tell you the increasing strength of its bases.
Thu Jan 17, 2019 2:28 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Basic vs. Alkaline
Replies: 2
Views: 330

### Re: Basic vs. Alkaline

From what i searched up, all alkalines can be basic but not all bases are alkaline. Alkalines are bases that dissolve in water. Bases are water solutions of any chemicals that contain a lower hydrogen ion concentration than pure water. Here's the link to an article that defines it better: https://sc...