CHEMISTRY COMMUNITY

davidryan3f

those terms are synonymous I believe.

davidryan3f

The slow step can't have intermediates. You substitute them using values in the other steps.

davidryan3f

yes for example, if the ion has a +2 charge and the coefficient in from of it is 2, then the charge for that species would be +4.

davidryan3f

the first law also states that heat energy cannot be created or destroyed

davidryan3f

You solve for Ka by setting up the equation for the equilibrium constant and pugging in the given values at equilibrium or substitute these values using X or a variation of that. Then you use algebra to solve for Ka.

davidryan3f

If you multiply a half reaction by a certain number in order to make the two half reactions have the same number of electrons, do you multiply the cell potential for the half reaction by that same factor?

davidryan3f

If a question states that a reaction between two gasses takes place, but does not specify a volume or a change in volume, how do we know if expansion work is done?

davidryan3f

Ould someone explain what exactly a state function is?

davidryan3f

If a reaction is exothermic, will the temperature always decrease? In not, what are the exceptions to this rule?

davidryan3f

If a reaction is exothermic, will the temperature always decrease? In not, what are the exceptions to this rule?

davidryan3f

If the amount of a solid is added to a reaction that is already at equilibrium, will the reaction shift left or right, or will it remain at equilibrium since the item added was a solid?

davidryan3f

the order of a reaction can be determined by looking at the rate law. Add up the exponents on each reactant and that gives you the order.

davidryan3f

will it be told to us which step is the slow step and which is the fast step???? asking for a friend

davidryan3f

jane_ni_2d wrote:how can you tell which is the anode and which is the cathode?

the anode is always on the right of the cell diagram and the cathode is on the right.

davidryan3f

In a cell diagram, the cathode was always on the right side of the double bar divider thing.

davidryan3f

simply stated, if you increase the concentration of the reactant or decrease the concentration of product the cell potential will increase.

davidryan3f

how do you know what is the cathode and what is the anode when looking at a cell diagram?

davidryan3f

What is the difference between Delta H and Delta U?

davidryan3f

Condensation is exothermic, releases heat, because it is the changing of a gas state to a liquid state.

davidryan3f

Yes negative work will occur when the system does work on its surroundings rather than the surroundings doing work oil the system.

davidryan3f

An isolated and closed system are different things. A closed system allows for the exchange of energy in and out of the system. However it does not allow matter to move in and out. On the other hand, an isolated system is completely closed off and does not allow the transfer or heat or energy.

davidryan3f

Delta H is positive when the reaction is endothermic and Delta H is negative when the reaction is exothermic.

davidryan3f

Phase changes from solid-->liquid-->vapor are endothermic reactions because it requires an input of heat and energy to break the intermolecular forces.

davidryan3f

H stands for enthalpy. So delta H represents the change in enthalpy during a reaction. If delta H is positive then the reaction requires energy and is endothermic. If delta H is negative then the reaction releases energy and is exothermic.

davidryan3f

A weak acid or base does not dissociate fully while a strong acid or base does indeed dissociate fully ion the solution.

davidryan3f

I know that you don't include solids and liquids into the equation when calculating the equilibrium constant but could someone please explain to me why that is? Thanks friends

davidryan3f

To calculate the percent ionization, divide the conjugate acid or base equilibrium molarity by the acid or base initial molarity.

davidryan3f

yes that is basically the definition of equilibrium.

davidryan3f

Molarity of a solid and liquid cannot change during the course of a reaction so there is no need to include them when finding K.

davidryan3f

Henry Dudley 1G wrote:What is the value of R?

R= 0.08206 L atm/mol K. This is given to us on tests I believe.

davidryan3f

anions in coordination compounds will have the endings -o -ido or -ato.

davidryan3f

yes, the two equations involving velocity are p=mv and KE= 1/2mv^2

davidryan3f

the answer would be sp, sp2, sp3, sp3d etc

davidryan3f

Cisplatin has a central atom of platinum with two Cl attached and two NH3 attached. It is tetrahedral.

davidryan3f

The greater the surface area off the molecule, the stronger the attraction/bond will be.

davidryan3f

the size of the atom refers to the atomic radius. Atomic radius increases as you go down the periodic table and to the left on the periodic table.

davidryan3f

I don't think it could physically happen in the conditions present on earth but it is certainly chemically possible.

davidryan3f

what is the chemical equation for acid rain?? I think we went over this in class but I missed it in my notes.

davidryan3f

Either simply memorize the common polydentates or draw the Lewis structure to determine if has two or more bonds that attach it to the central atom.

davidryan3f

Electronegativity increases as you go up the periodic table and as you go across the periodic table. Same goes for ionization energy.

davidryan3f

If it does not add up to 100%, then the question is incorrect. The elements that are apart of the compound have to add up to 100% or else there is a missing element.

davidryan3f

You will not always be given the momentum. Solve the debroglie equation algebraically. The question will always give you enough variables to solve for the missing ones.

davidryan3f

Conjugate bases are the result of the acid after it donates its proton. Comjugate acids are the result of the base after it accepts its proton.

davidryan3f

How does the fact that the ligands in cisplatin only bind at one site help account for the way that the drug stops cell division?

davidryan3f

nodal planes are the regions in which there is a zero % chance of finding an electron.

davidryan3f

light always travels at the same speed regardless of wavelength or amplitude. it is a constant.

davidryan3f

yes, the acid donates the proton and its conjugate receives the proton. the same goes for bases.

davidryan3f

Cl is considerably more electronegative than I, so the O-H bond is stronger than the O-I bond. therefore it is a stronger acid.

davidryan3f

the pi bond would break first because it is weaker than the sigma bond. It has a lower dissociation energy so it will break first.

davidryan3f

can someone explain to me why tetrahedral is sp3 hybridization?

davidryan3f

Bent is just another name for angular. they are synonyms .

davidryan3f

A molecule with a seesaw molecular geometry will have a total of 5 electron domains and one of them will be a lone pair of electrons. The molecule will have angles of 120, 180, and 90 degrees at various locations.

davidryan3f

What I the difference between electron arrangement and molecular geometry? I get that molecular geometry is a more specific description of the atom but Im not sure the difference between the two terms.

davidryan3f

Sigma bonds have more energy because since they are stronger bonds, they require more energy to be broken than pi bonds. Therefore they have more energy themselves.

davidryan3f

how does increasing the intensity of the incoming photon affect the energy of the photon. Does it increase its energy, and if so, does that increase the number of electrons that will be emitted?

davidryan3f

Could someone explain what exactly degeneracy is in quantum numbers?

davidryan3f

Can someone explain why neutrons do not diffract?

davidryan3f

This may be a dumb question but im a little confused. Can non metals form cations. if not, why can't they?

davidryan3f

No, I do not believe that the state of the molecule effects the type of bond that will form.

davidryan3f

yes, there are a few exceptions. These exceptions are hydrogen, helium, lithium, beryllium. These atoms don't need to fulfill the octet rule.

davidryan3f

You can round up or down if it is within .1 of the nearest whole number.

davidryan3f

Convert the units beforehand so that the math will be valid. For example in an m1v1=m2v2 problem, the volumes must be in the same units.

davidryan3f

I am pretty sure that it is just an uppercase M (g/mol).

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