Search found 39 matches

by eden tefera 2B
Sat Mar 16, 2019 10:18 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Reduction Potentials
Replies: 2
Views: 76

Re: Reduction Potentials

I find it much simpler to do Ecathode-Eanode instead of reversing cell potentials.
by eden tefera 2B
Sat Mar 16, 2019 10:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell potential and Gibbs Free energy
Replies: 2
Views: 79

Re: Cell potential and Gibbs Free energy

You can find n easily after balancing the redox reaction.
by eden tefera 2B
Sat Mar 16, 2019 10:16 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Determining n
Replies: 6
Views: 123

Re: Determining n

N is 2 because 1 electron is being added to Ce, but there are two moles of it so you multiply the number of electrons added/removed by the number of moles of the reduced/oxidized compound.
by eden tefera 2B
Sat Mar 16, 2019 10:14 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell potential
Replies: 3
Views: 102

Re: cell potential

I find it more straightforward to do Ecathode- Eanode rather than reversing Ecell because sometimes the reduction potential is negative and it can get confusing.
by eden tefera 2B
Sat Mar 16, 2019 10:12 pm
Forum: Phase Changes & Related Calculations
Topic: Specific heat capacity of ice
Replies: 2
Views: 90

Re: Specific heat capacity of ice

Since each of them have their own phase change, you use that phase's specific heat capacity.
by eden tefera 2B
Sat Mar 16, 2019 10:11 pm
Forum: Van't Hoff Equation
Topic: neutral pH not 7?
Replies: 6
Views: 143

Re: neutral pH not 7?

Using the vant hoff equation can help you see how temperature affects K. From there you can determine if a certain pH is neutral.
by eden tefera 2B
Sat Mar 16, 2019 10:08 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 115

Re: Arrhenius Equation

To add, using the arrhenius equation to solve for pre-exponential factor, A, gives you insight into the frequency of collisions that are in the correct orientation.
by eden tefera 2B
Sat Mar 16, 2019 10:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 4
Views: 113

Re: Catalysts

You should also know that a catalyst doesn't appear in the overall reaction.
by eden tefera 2B
Sat Mar 16, 2019 10:06 pm
Forum: *Enzyme Kinetics
Topic: Collision theory
Replies: 2
Views: 92

Re: Collision theory

You can tell if a reaction is likely to occur through the sign of delta G or Epotential.
by eden tefera 2B
Wed Mar 13, 2019 11:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Adiabatic vs. Isochoric
Replies: 2
Views: 111

Adiabatic vs. Isochoric

What is the difference between adiabatic and isochoric?
by eden tefera 2B
Sun Mar 10, 2019 11:01 pm
Forum: First Order Reactions
Topic: Pseudo rate laws
Replies: 2
Views: 37

Re: Pseudo rate laws

When you have a reaction that is not first order and you want to determine one of the reactant's concentration, you can use a pseudo-first-order reaction in which one of the reactants is in great excess, essentially remaining constant as the reaction progresses. This allows you to determine concentr...
by eden tefera 2B
Sun Mar 10, 2019 10:57 pm
Forum: First Order Reactions
Topic: Half-Life
Replies: 7
Views: 79

Re: Half-Life

To add, half-life is important to determine how quickly quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.
by eden tefera 2B
Sun Mar 10, 2019 10:56 pm
Forum: First Order Reactions
Topic: Half-Life
Replies: 7
Views: 79

Re: Half-Life

Half life is the time that it takes for a substance to decompose into half of its intial state, no matter the state.
by eden tefera 2B
Sun Mar 10, 2019 10:54 pm
Forum: Zero Order Reactions
Topic: Graphs
Replies: 8
Views: 112

Re: Graphs

I think that you should always get a linear plot for 0,1,and 2 order reactions!
by eden tefera 2B
Sun Mar 03, 2019 8:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2
Replies: 4
Views: 127

Re: Test 2

Thank you!
by eden tefera 2B
Sun Mar 03, 2019 8:58 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Q
Replies: 3
Views: 68

Re: Q

You should usually stick to using either concentration or partial pressures when calculating Q
by eden tefera 2B
Sun Feb 24, 2019 1:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2
Replies: 4
Views: 127

Test 2

Will we be expected to know how to calculate the standard potential of a couple
from two related couples on test 2?
by eden tefera 2B
Fri Feb 22, 2019 11:14 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: units
Replies: 7
Views: 172

Re: units

Pressure can sometimes be given in Pascals or kilopascals as well.
by eden tefera 2B
Fri Feb 22, 2019 10:38 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Relationship between K and G
Replies: 3
Views: 68

Re: Relationship between K and G

It helps to think of this in terms of k in an equilibrium equation to determine whether it will proceed to reactants vs products.
by eden tefera 2B
Fri Feb 22, 2019 10:34 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free Energy
Replies: 4
Views: 66

Re: Gibbs Free Energy

When deltaG is positive the reactants are more thermodynamically stable, so the reaction proceeds to the left.
When deltaG is negative the products are more thermodynamically stable, so the reaction proceeds to the right.
by eden tefera 2B
Mon Feb 18, 2019 4:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: standard Gibbs Free Energy
Replies: 4
Views: 56

Re: standard Gibbs Free Energy

Using "standard" simply indicates that the substances in question are in standard state.
by eden tefera 2B
Mon Feb 18, 2019 4:56 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G a state function?
Replies: 23
Views: 267

Re: Delta G a state function?

Yes, free energy is a state function
by eden tefera 2B
Mon Feb 18, 2019 4:55 pm
Forum: Van't Hoff Equation
Topic: Different Constants of Eqn
Replies: 3
Views: 82

Re: Different Constants of Eqn

To add, when the equation is derived, delta g is assumed to be zero since the system is at equilibrium
by eden tefera 2B
Sun Feb 10, 2019 12:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Delta H
Replies: 4
Views: 62

Re: Delta H

To add, delta H can also equal w if the temperature of the system is not changing because delta h = q+w and q would then be zero.
by eden tefera 2B
Sun Feb 10, 2019 12:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: methods
Replies: 8
Views: 136

Re: methods

You can also cross out bonds if both the products and reactants both have the same number!
by eden tefera 2B
Sun Feb 10, 2019 12:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Using Bond Enthalpies
Replies: 2
Views: 42

Using Bond Enthalpies

When a structure has resonance and you are calculating the enthalpy for its formation, how do you know whether to use the bond formation enthalpy for its single, double, or triple bonds?
by eden tefera 2B
Mon Feb 04, 2019 12:11 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Examples of Open Closed Isolated
Replies: 5
Views: 79

Re: Examples of Open Closed Isolated

open: bowl of hot soup
closed: a sealed bag of fruit
isolated: an insulated coffee mug
by eden tefera 2B
Mon Feb 04, 2019 12:08 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Cup of Tea
Replies: 17
Views: 294

Re: Cup of Tea

since in a cup of tea will cool down over time, it will exchange energy with surroundings. since a cup is typically not covered on the top, tea could also leave the system . since both matter and energy can be exhanged, then a cup of tea is an open system
by eden tefera 2B
Mon Feb 04, 2019 12:06 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated System (Water bottle)
Replies: 6
Views: 115

Re: Isolated System (Water bottle)

an insulated water bottle would keep temperature (energy) constant and if it is closed then no water will leave. this means that no matter or energy is exchanged, the qualifications for an isolated system
by eden tefera 2B
Sun Jan 27, 2019 3:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH
Replies: 9
Views: 138

Re: pH

pH is a measure of the amount of free hydrogen and hydroxyl ions in the water. Water that has more H+ ions is acidic, but water that has more OH- ions is basic. pH is affected by chemicals in the water, so it can be indicative of chemical changes happening in water.
by eden tefera 2B
Sun Jan 27, 2019 3:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What not to count
Replies: 9
Views: 136

Re: What not to count

You can typically disregard elements that don't affect the pH/pOH.
by eden tefera 2B
Sun Jan 27, 2019 3:48 pm
Forum: Phase Changes & Related Calculations
Topic: Why are phase changes endothermic?
Replies: 11
Views: 117

Re: Why are phase changes endothermic?

Phase changes like freezing, however release energy into the surroundings so it can be considered exothermic.
by eden tefera 2B
Sun Jan 20, 2019 10:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.3 6th edition
Replies: 3
Views: 59

Re: 11.3 6th edition

I think the directions should tell you to balance it first.
by eden tefera 2B
Sun Jan 20, 2019 5:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Salt formation
Replies: 3
Views: 66

Salt formation

How is a salt formed?
by eden tefera 2B
Sun Jan 20, 2019 5:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength and Weakness
Replies: 2
Views: 38

Re: Strength and Weakness

You can compare the strength of two acids by comparing their acidity constants. small Ka values correspond to weak acids.
by eden tefera 2B
Sun Jan 20, 2019 3:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: reaction of AlCl3
Replies: 1
Views: 30

Re: reaction of AlCl3

AlCl3 can act as an acid because it accepts electrons.
by eden tefera 2B
Sun Jan 20, 2019 3:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Assuming X value
Replies: 3
Views: 51

Re: Assuming X value

You can typically assume that the value of x is negligible when the Ka or Kb is less that 10^-3. If it's not, then you should always include x in your calculations.
by eden tefera 2B
Sun Jan 20, 2019 3:25 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: HW Q
Replies: 2
Views: 42

Re: HW Q

You should repeat the same process of finding pH, but instead use the actual volume used, which was 250 mL.

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