CHEMISTRY COMMUNITY

joshtully

The unit is usually in seconds, but the problem will always tell you.

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Catalysts are not consumed.

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Catalysts are neither products nor reactants.

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This is because it limits the rate of the reaction.

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An intermediated is a substance that is not seen in the overall reaction. It is created as a product and then consumed.

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Thank you for the help!

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Increasing temperature (T) also increases k.

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K is the Boltzmann constant.

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Yes, we will be tested on that on the final.

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Yes, we will.

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n is the number of moles of electrons transferred in a reaction.

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The anode goes on the left side and the cathode goes on the right side.

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The salt bridge is used to maintain neutrality.

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The problem will usually just tell you.

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Yes, the oxidizing agent is the one being reduced.

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A spontaneous reaction can occur without any additional energy input.

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Coefficients do not affect oxidation numbers.

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E is a path function.

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Think of the opposite: reducing agents are oxidized and oxidizing agents are reduced.

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Cells and batteries are basically the same thing.

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This is very helpful, thank you!

joshtully

If work is being done to the system, it is positive. If the system is doing work, then it is negative.

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Also check units.

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Use 8.3145

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Good one.

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Go to "your posts".

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Check the units of the equation to determine which R value to use.

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External pressure is the pressure outside of a system acting on it.

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Work is the transfer of energy through distance.

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Correspond R with the units in the problem.

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Matter cannot leave a closed system but it does not have to be insulated.

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It is insignificant when it is by 10^-4 or less.

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It states that enthalpy is a state function.

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Endothermic reactions has a positive delta H value while exothermic has negative.

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Vapor and gas are the same thing.

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It means that the heat of the reaction is equal to the heat of the surrounding.

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Yes, you have to calculate the Kb value from Ka in this problem, because your are finding the pH of a weak base.

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This is true for monoprotic acids.

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Find the initial B value by adding the values of BH+ and B at equilibrium.

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Make a song.

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Use ICE boxes to find unknown concentrations when given the concentration of another substances.

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When Q > K, the reaction shifts towards reactants, and when Q < K, the reactions shifts towards products.

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K is just Q at equilibrium.

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ICE boxes are usually just used for weak acids and bases.

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Test both and usually only one will work.

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Q will equal K at equilibrium.

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Temperature should be in Kelvin in this instance.

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Only include water when it is a gas, not solid or liquid.

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Kc is used when given concentration, and Kp is used when given partial pressures.

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When a reaction is reversed, K becomes 1/K.

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P is pressure, V is volume, n is number of gaseous moles, R is the gas constant, T is temperature in Kelvin.

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Yes, alkaline means basic.

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Use the equation H+= 10^pH.

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It is amphoteric.

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Water can act as both.

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When water reacts with pollutants it becomes acidic.

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It stands for ethylenediamine, which is a bidentate ligand.

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Make sure you exclude the prefix when arranging in alphabetical order.

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Studying the ligand chart could be helpful.

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It goes in alphabetical order, without prefixes.

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The coordination number of a metal ion is the number of bonds it has with ligands.

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Equatorial planes are horizontal (like the Earth's equator) and axial planes are vertical (like the Earth's axis).

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The shape is called "bent."

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Yes, lone pair electrons do count.

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H2O would be bent because of the lone pairs.

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You should draw the most stable Lewis structure to find the molecule's geometric shape.

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Pi bonds form when p orbitals overlap.

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Do we have to know how to determine the shapes of hybrid orbitals.

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It is because there are 4 orbitals (1 s and 3 p).

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All covalent bonds have sigma and pi bonds. Single bonds only have sigma bonds, and double and triple bonds have sigma and pi.

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Bond angles are experimentally determined rather than calculated.

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All molecules experience London Dispersion Forces.

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The resonance structure with charges closest to zero will contribute the most.

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The most stable resonance structure has to little to no charges on each atom.

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No, we do not need to calculate actual lengths.

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The answer is D because it is the only option that contains an H atom bonded between N, O, or F.

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Yes, every molecule has LDF.

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Yes, selenium is an exception to the octet rule.

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You can figure out the valence electrons of an element by counting which column it is in, skipping the d block.

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Acids accept electron pairs, while bases donate electron pairs.

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The answer would be London dispersion force and dipole-dipole.

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I learned throughout high school to prioritize the vertical vertical direction!

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When an atom is at its ground state, it is at its lowest, unexcited, and most stable energy level.

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Anions have the largest ionic radius, while cations have the smallest ionic radius.

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Whichever ions have the most protons have the smallest ionic radius, because they pull the electrons in tighter.

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Yes, it is possible for l to equal 4, but it is not necessary to know for this class.

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This is false, because frequency and energy increase simultaneously.

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No, noble gases do not apply to the electronegativity trend.

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Chlorine is an exception to the octet rule.

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Hydrogen bounds are only found on oxygen, fluorine, and nitrogen.

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Ionic bonds are stronger than covalent bonds. This is due to coulombic attraction.

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It could be helpful to have a general idea of what the spectrum looks like, but I do not think specifics are necessary.

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It could be helpful to reach out to people in your same section to form a study group.

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I believe 3d comes before 4s.

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I try to get a good night of sleep before big exams, and I wake up early and give myself enough time to get prepared.

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I actively take notes during lectures, and then I use those notes for homework. I have not done many textbook problems yet, but I plan to do them to study for exams.

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There is a trend for atomic radius.

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What should be done if the smallest number in the problem has 1 sig fig, and the answer is something like 1432 g? Should we round to 1000 g since that would be 1 sig fig?

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What is an amu? I understand that it is a unit for molecular mass, but what does it stand for?

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Moles are a counting unit. Just like how a dozen eggs are 12 eggs, 1 mole of atoms/molecules is 6.022x10^23 atoms/molecules.

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