CHEMISTRY COMMUNITY

Jasmine W 1K

Kp is used with gases and Kc is used when you are dealing with concentrations.

Jasmine W 1K

It depends on the units given in the problem. All of the R constants mean the same thing; the numbers just change due to unit conversions.

Jasmine W 1K

K is inversed so it becomes 1/K.

Jasmine W 1K

yes. the units for rate is always concentration (M) over time (s)

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Chemical Equilibrium!

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Rate constants are always positive because concentrations cannot be negative.

Jasmine W 1K

No, we are not covering third order reactions.

Jasmine W 1K

for zero-order reactions, K has units of M/s
for first-order reactions, K has units of 1/s
for second-order reactions, K has units of 1/M.s

Jasmine W 1K

It is usually best to use the standard units if nothing is specified.

Jasmine W 1K

n represents the order of the reactants.

Jasmine W 1K

A is the frequency factor or pre-exponential factor. It includes the number of collisions with the correct orientation.

Jasmine W 1K

The rate law is a differential equation that only considers the initial rate, while the integrated rate laws can be used to discover how quickly a reaction has progressed over a certain amount of time.

Jasmine W 1K

The instantaneous rate is more precise because it isn't an average.

Jasmine W 1K

In lecture, Dr. Lavelle went over the derivations for the first, second, and zeroeth order rate laws and their half-life reactions. He did not go over the derivation for the Arrhenius equation though.

Jasmine W 1K

It is thermodynamically spontaneous because delta G is negative, but it won't proceed normally because it has such a high activation energy.

Jasmine W 1K

It is usually mol per L per unit of time, which is usually in seconds.

Jasmine W 1K

I think of it in terms of opposites, so whatever is being oxidized acts as the reducing agent and whatever is being reduced acts as the oxidizing agent.

Jasmine W 1K

The metal that becomes an ion is the one that dissolves in the solution. Also, most reactions would identify it as dissolved by using (aq).

Jasmine W 1K

Activation energy is the minimum amount of energy required to begin the reaction. In an energy diagram, it is the highest peak on the energy graph.

Jasmine W 1K

An intermediate is formed and used up during the reaction, so it will not be included in the rate law because it isn't part of the overall reaction.

Jasmine W 1K

Reactions with short reaction times are usually controlled by kinetics, while reactions with longer reaction times are usually controlled by thermodynamics.

Jasmine W 1K

The unit would be kJ.

Jasmine W 1K

It can be found in Appendix 2B at the back of the book!

Jasmine W 1K

The negative is to make sure that when E is positive, delta G will be negative, meaning that the reaction would be spontaneous.

Jasmine W 1K

Adriana_4F wrote:What happens if the number of electrons transferred is different? Do you have to balance the equation to make it the same?

Yes, you would have to balance the half-reactions so that the number of electrons transferred is the same.

Jasmine W 1K

E is usually given for reduction reactions. When you need to find E for an oxidation reaction, you flip the sign for the equivalent reduction half-reaction.

Jasmine W 1K

The order of the cell diagram depends on state, not the order of the reaction, so it should be s|g|aq||aq|g|s.

Jasmine W 1K

Galvanic cells are spontaneous, so E has to be positive.

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C(gr) refers to carbon in the form of graphite.

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The purpose of the salt bridge is to maintain electrical neutrality between the cathode and anode to keep the cell from reaching equilibrium too quickly.

Jasmine W 1K

The purpose of the salt bridge is to maintain electrical neutrality between the cathode and anode to keep the cell from reaching equilibrium too quickly.

Jasmine W 1K

I think of it in terms of opposites, so whatever is being oxidized acts as the reducing agent and whatever is being reduced acts as the oxidizing agent.

Jasmine W 1K

In an acidic solution, you can use both H+ and H2O to balance the equation. In an acidic solution, You can add H2O to balance the oxygen first, and then H+ to balance the hydrogens. In a basic solution, you can add OH- to balance the oxygens and then add H2O to balance the hydrogens.

Jasmine W 1K

You can use both H+ and H2O to balance redox reactions when they occur in acidic solutions.

Jasmine W 1K

In a cell diagram, the anode would be on the left and the cathode would be on the right, separated by || (the salt bridge).

Jasmine W 1K

In an acidic solution, you can balance it using H2O and H+, while in a basic solution, you can balance it using H2O and OH-.

Jasmine W 1K

For this reaction, would Cl2 be both the oxidizing and reducing agent?

Reaction of chlorine in water:
Cl 2 (g) --> HClO(aq) + Cl-

Jasmine W 1K

Start by identifying the oxidized and reduced species. The oxidation number for Cr changes from +6 to +3, indicating reduction (gain of 3 electrons). The oxidation number for C changes from -2 to -1, indicating oxidation (loss of 1 electron). You now have the skeleton for your half-reactions: (Cr2O...

Jasmine W 1K

Test 2 has been postponed to week 9 starting on Tuesday during discussion sections.

Jasmine W 1K

Do you have to figure out the oxidation numbers of all of the parts of the reaction in order to figure out which parts are oxidized and which are reduced?

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In an equation, if the oxidation number of one of the elements decreases, is that a way to see if it is reduced? Same question for if the oxidation number increases, would it be oxidized?

Jasmine W 1K

Is the oxidation number just the charge? If not, how do you find the oxidation number?

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The following reaction is used in the acidic solution in the Breathalyzer test to determine the level of alcohol in the blood: H+(aq) + (Cr2O7)-2(aq) + C2H5OH(aq) ---> (Cr)3+(aq) + C2H4O(aq) + H2O(l) I need help figuring out how to get a balanced redox equation by writing the balanced oxidation and ...

Jasmine W 1K

In this equation: delta U = q + w, how would you know whether or not work would be positive or negative?

Jasmine W 1K

In this equation: delta U = q + w, how would you know whether or not q would be positive or negative?

Jasmine W 1K

I am confused about why we don't include the solids when calculating K because they are included within the reaction.

Jasmine W 1K

How do you know whether you can use the approximation shortcut rather than the quadratic equation for problems involving ICE tables?

Jasmine W 1K

K is the equilibrium constant, while Q is the reaction quotient and can, therefore, be used at any time during the reaction. This means that Q can be calculated even when the reaction is not at equilibrium, leading to K and Q possibly being different numbers. by comparing the different values of K a...

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c) If one starts with a higher pressure of reactant, the equilibrium constant will be larger.
I don't really understand why this is false, because I thought that pressure affects the equilibrium constant for gases. Can someone please explain why this is false?

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