CHEMISTRY COMMUNITY

Ryan Yoon 1L

Kc deals with concentrations and Kp deals with atm and torr.

Ryan Yoon 1L

n is the whole number mole value of electrons that were shared in the half reactions.

Ryan Yoon 1L

n is the whole number mole value of electrons that were shared in the half reactions.

Ryan Yoon 1L

Yes, a higher E value means that its is a very strong oxidizing agent, meaning that it is the cathode as it is reduced.

Ryan Yoon 1L

commas are used to notify the audience that the half reaction are the same phases. | are used to indicate change in phases or an inert metal acting as a neutral electrode.

Ryan Yoon 1L

The activation energy is the energy barrier or energy needed to process the reaction through.

Ryan Yoon 1L

You can determine the activation energy given the rate constant, temperature, and A with the Arrhenius equation

Ryan Yoon 1L

What is the pre-exponential factor A?

Ryan Yoon 1L

Since orders are independent from stoichiometric coefficients, you can find the order via experimental data. If the initial concentration doubles and the initial rate quadruple, it is a second order rxn. If the initial concentration doubles and the initial rate doubles, it is a first order rxn. If t...

Ryan Yoon 1L

It depends on the equation as the integrated rate of k[A] is ln[A]=-kt+ln[A], which we use to find {A} at a given time.

Ryan Yoon 1L

There will be no noninteger orders as Lavelle said most calculations are centered in whole number calculations and they arent common in nature.

Ryan Yoon 1L

The Unique rate is the same for all reactants and products on the unique reaction regardless of concentration.

Ryan Yoon 1L

Since Kinetics dictates the speed of chemical reactions, the diamond reaction is very very slow due to high energy activation barrier.

Ryan Yoon 1L

Question above

Ryan Yoon 1L

Salt Bridges serve as a means to keep the overall charges in each solution neutral via ions that do not affect the reaction. By keeping it neutral, the reaction continues to proceed.

Ryan Yoon 1L

Why do some redox reactions produce electric current?

Ryan Yoon 1L

The || represents the salt bridge and | is the interphase between phases in contact. The basic structure is cathode(REDUCTION)||anode(OXIDATION).

Ryan Yoon 1L

Why is that if you increase the concentration of product, E is smaller than E standard?

Ryan Yoon 1L

Why do we put a porous/salt bridge in beakers that have the cathode and anode?

Ryan Yoon 1L

Why do we compare electron transfer of all cells?

Ryan Yoon 1L

Why does E stay the same when the reaction it relates to is multiplied by a coefficientt

Ryan Yoon 1L

Why is the difference in entropy the same when temperatures are increased?

Ryan Yoon 1L

We use Van't Hoff equation if we want to solve for the K at a differnet temperature if we are given the standard enthalpy, original temperature, and k value.

Ryan Yoon 1L

Why are pure elements zero but ions of said elements not zero?

Ryan Yoon 1L · 2-14-2020 lecture question Why were electrons in the 2 half-reactions?

Why were electrons in the 2 half-reactions?

Ryan Yoon 1L

Question above

Ryan Yoon 1L

Since reversible processes use infinitesimally small changes, which leads to more work done.

Ryan Yoon 1L

Why do gas molecules occupy more space then liquid and solid phases?

Ryan Yoon 1L

Why is Entropy an extensive property and not an intensive property?

Ryan Yoon 1L

why does gas expand when the change in volume is zero?

Ryan Yoon 1L

Why are Reversible processes do more work than irreversible processes?

Ryan Yoon 1L

A state property is not dependent on the path taken to obtain that state, meaning the end result is what matters and not the intermediate steps

Ryan Yoon 1L

Why can we add or subtract enthalpy changes?

Ryan Yoon 1L

It does matter for the molecules to have the same amount on the product and reactant side as they are intermediates in the reaction that get canceled.

Ryan Yoon 1L

delta h is the amount of heat released or absorbed at a constant pressure, which is also enthalpy. whereas q is the heat being transferred. they are equal to each other if they are at the same pressure.

Ryan Yoon 1L

Why is it that using bond enthalpies is the least accurate method to calculate energy transfer?

Ryan Yoon 1L

How do we calculate the molar concentration of H3O given just the Kw? Assuming that you are calculating the [h3o+] of pure water and it is at 25 degrees Celcius, the concentration of H3O+ be 1.0*10^-7.

Ryan Yoon 1L

The Calcium Hydroxide is dissolved in water making it an aqueous solution.

Ryan Yoon 1L

The summation of partial pressure gives the total pressure.

Ryan Yoon 1L

At 25 degrees Celcius, Kw is measured to be 1.0*10^-14. Ka,Kb, and Kw varies by temperature.

Ryan Yoon 1L

At 25 degrees Celcius, Kw is measured to be 1.0*10^-14. Ka,Kb, and Kw varies by temperature.

Ryan Yoon 1L

When Q<K, this signifies that there are more reactants than the product currently at the system. Since there are more reactants than products, the reaction will go forward.

Ryan Yoon 1L

Types of stress on a system consist of: the addition/removal of a component in a reaction at equilibrium, compression or expansion, and change in temperature

Ryan Yoon 1L

If K is smaller than 10^-3, you can assume and approximate that there is no change to the reactant. This, in turn, will enable you to calculate the X amount gained much easier.

Ryan Yoon 1L

With regards to the effect of changing temperature in a reaction, it depends whether if said reaction is exothermic or endothermic. If exothermic and the temperature rises, the reaction will favor the formation of reactants. If endothermic and the temperature rises, the reaction will favor the forma...

Ryan Yoon 1L

Typically Inert gases are Noble gases, which do not react with other molecules or atoms due to the fact that they contain a complete valence shell. Since they do not react, they do not interact with the components of an equilibrium mixture when added. Thus, they do not contribute to Equilibrium cons...

Ryan Yoon 1L

Since the equilibrium constant is dependent on temperature, changing temperature will change K. A change in the equilibrium concentrations will arise the reaction quotient, Q, until the system reaches K again.

Ryan Yoon 1L

Only pure solids and liquids can't be used to determine K. Aqueous solutions on the other hand can be used as they are not pure liquids and since they have a molar concentration.

Ryan Yoon 1L

If Equilibrium sits to the left when K<10^-3 and sits to the right when K>10^3, the what does 10^-3<k<10^3 signify?

Ryan Yoon 1L

Inert Gases have no effect on the equilibrium reaction because they do not interact with either the reactants and products undergoing equilibrium. They do not interact with them because noble gases are extremely stable.

Ryan Yoon 1L

No. If Q>K at some point in the reaction, the reverse reaction is favored and more reactant will form so that the system will go towards equilibrium.

Ryan Yoon 1L

Although K, the equilibrium constant, and Q, the reaction quotient, uses the same formula to find the value, they are not the same. The concentrations of reactant and product in K are in equilibrium, while the concentrations of reactant and product in Q have yet to reach equilibrium.

Ryan Yoon 1L

We ignore the terms that are solids when calculating the equilibrium constant because solids do not have concentration. Since it does not have a concentration, it can not be implemented in solving for the Reaction Quotient, Q, or Equilibrium constant, K.

Ryan Yoon 1L

K does not have units because it is a ratio of chemical activity of product to reactant. Chemical activities have no units and they are the product of the activity constant and the concentration of either reactant/product.

Ryan Yoon 1L

The Homework for week 1 is due tomorrow, Friday, at lecture.

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