CHEMISTRY COMMUNITY

Natalie Benitez 1E

How exactly does a reactant have an order as compared to an overall reaction order?

Natalie Benitez 1E

How does having three reactants affect the rate law?

Natalie Benitez 1E

How does a catalyst affect the activation energy?

Natalie Benitez 1E

Do coefficients play a role in elementary reactions??

Natalie Benitez 1E

Is k and k' related to each other since one is the rate of the forward reaction and the other is the rate of the reverse reaction?

Natalie Benitez 1E

What does an heterogeneous catalyst mean?

Natalie Benitez 1E

Based on the half-life you calculated in order to get to get to 1/4 or say 1/6 you would double or triple the half-life you got.

Natalie Benitez 1E

follow up for this question.. what would be the number of moles to obtain delta G? The number of moles involved for calculating the delta G (n) is the moles of electrons transferred overall. Be sure the electrons used in the reduction half reaction and the oxidation half reaction are the same. If n...

Natalie Benitez 1E

If the galvanice cell ever reaches zero this means that the battery has died out and that there is no electron transfer occurring because the E(cathode) is equal to the E(anode).

Natalie Benitez 1E

Basically all of electrochemistry and the equation of Gibbs free energy involving cell potential.

Natalie Benitez 1E

Electrochemical series is the table we use to find the cell potential of half reactions.

Natalie Benitez 1E

If 2 species are in the same phase you separate them using a comma and if they are in different lashes you separate them using a single vertical line (|).

Natalie Benitez 1E

The cathode should be the one with the larger E value.

Natalie Benitez 1E

If the cell potential for a reaction is positive that means that delta G is negative meaning the reaction is spontaneous.

Natalie Benitez 1E

The n is the number of moles of electrons being transferred within a redox reaction. The oxidation numbers for oxygen (O2) is -2 and for (O) it’s -1. Hydrogen is always +1 and you should also consider the overall charge of the molecule when assigning oxidation numbers.

Natalie Benitez 1E

The salt bridge is put into place so as the balance out the charges within the cathode and the anode. By doing so you arre able to prolong the transfer of electrons

Natalie Benitez 1E

Typically when writing a cell diagram the cathode (reduction) goes on the right and the anode (oxidation) goes on the left. Metals are typically placed on the outskirts of the cell diagram as well.

Natalie Benitez 1E

What circumstances should we use the difference values of R?

Natalie Benitez 1E

How does one determine a system is isolated and what does that tell us about its volume and pressure?

Natalie Benitez 1E

How does one determine whether a system is open and what does that say about pressure and volume?

Natalie Benitez 1E

What does it mean when we have negative work?

Natalie Benitez 1E

What calculation do we also have to incorporate when going from a gas to a liquid or vice versa?

Natalie Benitez 1E

What exactly does a bufffer solution do and how do they relate to strong or weak acid and bases.

Natalie Benitez 1E

In retrospect by decreasing pressure you are increasing volume since P and V are inversely related to each other. By increasing the volume you essentially have more space for gas to move about, therefore, favoring the side with more moles of gas.

Natalie Benitez 1E

Why and how are we able to equal nRT to work?

Natalie Benitez 1E

Cv is used for constant volume and Cp is used for constant pressure.

Natalie Benitez 1E

Why does entropy and enthalpy have different units?

Natalie Benitez 1E

Why exactly does delta G have to be negative to be considered spontaneous?

Natalie Benitez 1E

Under what conditions does work equal zero?

Natalie Benitez 1E

How do you determine an elements oxidation number ?

Natalie Benitez 1E

Why can’t U be the internal energy of an open system?

Natalie Benitez 1E

How do we know whether work is positive or negative?

Natalie Benitez 1E

How would we know on the exam if something is reversible or irreversible ?

Natalie Benitez 1E

I remember that enthalpy(delta H) is the same as q, can someone explain this?

Natalie Benitez 1E

I’m not exactly sure what a piston is and how that works in the diagram.

Natalie Benitez 1E

Can someone explain why we need to take the integral with bounds being the initial and final volume ?

Natalie Benitez 1E

How do we know the heat capacity also how does heat transfer of energy work?

Natalie Benitez 1E

How do we tell with enthalpy that a reaction is exothermic or endothermic?

Natalie Benitez 1E

What exactly is the concept of spontaneity and how does it relate to enthalpy?

Natalie Benitez 1E

Why would the reverse reaction of vaporization, melting and sublimation be exothermic?

Natalie Benitez 1E

Does adding a catalyst affect the K since it reaches equilibrium at a faster rate?

Natalie Benitez 1E

A change in pressure or concentration only effects the direction the reaction is going because it will shift in direction to maintain equilibrium. However, a change in temperature effects the rates the reactions are occurring, thus, effecting the K value.

Natalie Benitez 1E

Gerald Bernal1L wrote:you divide the change number by the concentration of the acid. Then you multiply by 100 if you want the percent.

What exactly is the change number as mentioned in the above quote ?

Natalie Benitez 1E

How does Le Chatliers Principle apply to the concept of pressure?

Natalie Benitez 1E

An inert gas is basically a noble gas where the ones we will most likely see in reactions are He or Ar.

Natalie Benitez 1E

How exactly is the Q different from K if they are calculated the same way?

Natalie Benitez 1E

Kp is used, specifically, if the partial pressure of the reactants and products are given and the Kc is used if the concentration of the reactants and products are given.

Natalie Benitez 1E

I believe the constant will be given to us in the constant sheet so what don't really need to worry about it.

Natalie Benitez 1E

I'm not sure if the constant Kc will be the same as Kp but I do know that they are used on whether you were given concentrations or if you were given partial pressures.

Natalie Benitez 1E

What is the difference between the bar unit and the atm unit for pressure?

Natalie Benitez 1E

Does dynamic equilibrium mean that the reaction is constantly going through the forward and reverse reaction since the reactants make the products and the products can make the reactants?

Natalie Benitez 1E

How can a molecule bind in more than one area? Is it because there are elements that have lone pairs on them?

Natalie Benitez 1E

Why exactly do we need to use these different prefixes as compared to using di, tri, tetra?

Natalie Benitez 1E

For en and edta are expected to know the chemical formula in its entirety?

Natalie Benitez 1E

How many Oxygen does it take to make hemoglobin?

Natalie Benitez 1E

What exactly is a chelating ligand? Can you also provide an example for it?

Natalie Benitez 1E

When exactly do we use bis, cis, tris, etc.? How are they any different from using the other prefixes such as di, tri, etc.?

Natalie Benitez 1E

When a molecule has en in it, for example, [CoCl2(en)2]+ what does it mean exactly? Does this also have an effect on the charge of the compound?

Natalie Benitez 1E

If the overall coordination sphere has a negative charge does it have an effect on the nomenclature on the compound?

Natalie Benitez 1E

Can we tell what hybridization state an element has if they have a sigma bond?

Natalie Benitez 1E

Can we tell what type of hybridization state an element has if they have a pi bond?

Natalie Benitez 1E

Do anions and cations outside of the coordination sphere need prefixes when we write out the name ?

Natalie Benitez 1E

When naming a coordination compound, do we put the molecule outside of the coordination sphere before or after the name? Typically if whatever is outside of the sphere is a cation then it goes before the name but if it is an anion then you would just write it after the name. So K4[Ni(CN)4] would be...

Natalie Benitez 1E

If an anion comes after the brackets does it affect the nomenclature of the compound, if so how?

Natalie Benitez 1E

If there is a cation in front of the brackets does that affect the nomenclature of the compound, if so how?

Natalie Benitez 1E

When we were drawing out how the pi bonds looked on molecules, we drew two regions for the pi (one on top of the molecule and one on the bottom) but this only represented a single pi bond and not two, can someone explain the logic behind this?

Natalie Benitez 1E

What exactly is dative bonding? I know that its a type of binding between transitional metals and ligands but what exactly does it entail?

Natalie Benitez 1E

What is the significance of the coordinate covalent bonds? Are these bonds involved in lewis acids and bases?

Natalie Benitez 1E

How do we tell there is a major difference in electronegativity to cause dipole-moments? Is there a specific range or even an electronegativity chart being given?

Natalie Benitez 1E

When calculating formal charge the order doesn't matter because each element has there own formal charge. This is calculated through subtracting the number of bonds a lone pair electrons from the valence electron of that given element. As for adding the charges at the end, the only thing you should ...

Natalie Benitez 1E

Laura WM 3I wrote:It it better to have 2 formal charges of -1 or 1 formal charge of -2?

This depends on the element itself. If one element is more electronegative compared to the other then you should place the negative charge on the element with the higher electronegativity.

Natalie Benitez 1E

Why exactly are there induced dipoles? Is it simply because the molecule would just be more stable if it were bonded or is there another factor that is playing in this?

Natalie Benitez 1E

Pi bonds prevent the molecule from rotating, is this because it is formed from a double bond (one sigma and one pi)?

Natalie Benitez 1E

I know that the trend of electronegativity increases as you go up and to the right, however, in the case of oxygen and chlorine which one has a higher electronegativity and what aspect of that element makes it so?

Natalie Benitez 1E

While both molecular geometry's do have two bonds connected to the central the main thing to consider is if there are any lone pairs on the central atom as well. There are two instances when it can be considered linear; one way is when there are only two bonds to the central atom and no lone pairs, ...

Natalie Benitez 1E

Can we refer to bent as angular or v-shaped as well or are we limited to just saying bent for exams?

Natalie Benitez 1E

Why is the molecule OCS is considered polar,shouldn't their dipoles cancel out making the molecule non-polar?

Natalie Benitez 1E

In class, we used Carbon as an example to understand hybridization since it can adopt all types of hybridization (sp3, sp2, and sp1). Can someone explain why that is?

Natalie Benitez 1E

Why is it that the sigma is the first bond to always form and not the pi bond?

Natalie Benitez 1E

What is the bond between an s-orbital and an s-orbital called?

Natalie Benitez 1E

What exact factors of the VSPER model helps us determine the shape/orientation of molecules?

Natalie Benitez 1E

DarrenKim_3G wrote:I believe cancelling out has to do with the symmetry of a molecule. For example C2Cl4 has no net dipole moment because the molecule is symmetric so the moment cancels out

When you say symmetric what does that exactly refer too, perhaps the shape of the element?

Natalie Benitez 1E

How can we determine between elements which will have a higher boiling point?

Natalie Benitez 1E

Is there another way besides drawing out an element to determine the polarity?

Natalie Benitez 1E

In terms of covalent, ionic, and hydrogen bonds which is the strongest and why? I would think ionic but I can see how hydrogen bonds are stronger since they are easily attracted to high electronegative elements.

Natalie Benitez 1E

When Lavelle was drawing the water molecule to show the dipole moment why did he put the arrows pointing toward the oxygen? Is it because of oxygen's higher electronegativity?

Natalie Benitez 1E

D-nice1D wrote:I think that would lead to the oxygen having a 2+ formal charge

Adding on, Oxygen has a high electronegativity so having a formal charge of 2+ is not ideal.

Natalie Benitez 1E

Is there a limit on the number of electrons the exceptions to the octet rule can have?

Natalie Benitez 1E

So in terms of delocalization can we say this occurs when atoms form bonds with each other because in a way they are spreading out their electrons through sharing them?

Natalie Benitez 1E

Just for clarification, ionic bonds are formed between elements that are further from each other due to a substantial difference in their electronegativity?

Natalie Benitez 1E

Why is that when we learned about the Heisenberg uncertainty principle the principle was h/4*pi but in the textbook, they referred to the constant as h/2.

Natalie Benitez 1E

Q: What's the best thing to learn about equilibrium?
A: Nothing changes.

Natalie Benitez 1E

Q: Why didn't Na and Cl relationship workout?
A: Because they were salty together.

Natalie Benitez 1E

APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!

Thank you !!!

Natalie Benitez 1E

I remember that there were certain exceptions to the Lewis structure in regards to the octet rule, however, I don't understand the logical/reason behind it. Can someone please explain?

Natalie Benitez 1E

Thanos got jokes!

Natalie Benitez 1E

Me: Do you know why I make bad jokes about chemistry?
Friend: No, why?
Me: Because, all the good one's Argon.

Natalie Benitez 1E

Is there a way to access the lecture powerpoints because I wanted to screenshot one of the images and print it out for reference in my notes.

Natalie Benitez 1E

I remember in the lecture the slides said that visible light can be seen from 700nm (Red) to 400nm (Violet) but in the picture from the slides it went up to 720 nm. So, basically my question is if visible light ranging from 700 nm to 400nm or from 720nm to 400nm.

Natalie Benitez 1E

I don't want to be that person but what does dimensional analysis mean?

Search found 100 matches