CHEMISTRY COMMUNITY

RalphGuevarra

Hi

How can we tell which step is the slow step and which is the fast one? Or will it always be given which one is the slow step and the fast step?

RalphGuevarra

In order to start solving this question. First, we can write down the general formula: rate = -\frac{\Delta [a]}{\Delta t} = -\frac{1}{3}\frac{\Delta [B]}{\Delta t} = \frac{1}{2}\frac{\Delta[C]}{\Delta t} . Then we can arrange this to solve for the relative rate of change of each species: \frac{\Del...

RalphGuevarra

In this problem, we know that rate is based on the slowest step. So, first, we have to identify the slowest step in the mechanism, which is I-(aq) + HClO(aq) --> HIO(aq) +Cl- (aq). After this, we can apply our slowest step to the rate law: rate= k slow [HClO][I-]. However, step 1 has HClO as a produ...

RalphGuevarra

For this problem use the arrhenius equation k = Ae^−EaRT where A is the frequency factor 8.07×1011. You should convert the temperature into Kelvin from Celsius, rearrange the equation to kA = e^−EaRT and take the natural log of both sides so that your equation becomes Ea =−RTln(k/A). You can then i...

RalphGuevarra

Unimolecular is when there is only one reactant in the reaction, while Bimolecular Is when there are two reactants in the reaction. For instance,
Unimolecular: A --> C
Bimolecular: A + B --> C

RalphGuevarra

$K_{1} and K_{2}$ represents the forward rates for multi-step reactions, while K' represent the reverse rate constant

RalphGuevarra

To tell which step is the rate-determining step is to find which step is the slowest because the slowest step among the given reaction will always be the rate-determining step

RalphGuevarra

In order to find the overall order, you will have to sum up the exponents of each reactant.

RalphGuevarra

Hi,

Can someone elaborate on how to approach this problem, please? I've been trying to solve this problem. However, I keep getting the wrong answers. Thank you!

RalphGuevarra

The reduction half-reaction (right) and oxidation half-reaction (left) are separated into two half cells by the salt bridge. The half-reaction cell where oxidation (left) occurs is called the anode, while the half-cell where reduction occurs is called the cathode (right).

RalphGuevarra

here is a useful Mneonic:
LEO says GER
Losing Electron is Oxidation, while Gaining Electron is Reduction

RalphGuevarra

Thank you so much for the answer! This is extremely helpful!

RalphGuevarra

Hi, I am stuck on the balancing equation part of question 5. I'm having a hard time using H2O or OH- to cancel things out. Can anyone demonstrate to me how to do this one, please? So I can see how to use H2O or OH- to balance it. Also, how do we know whether we must use H2O or OH- to balance the equ...

RalphGuevarra

Hey Exothermic, you are so good at making bonds and the energy you give off is so hot. Do you want to hang out anytime tomorrow?

RalphGuevarra

You must be built from Copper and Tellurium... because you are so CuTe

RalphGuevarra

DeltaH and q are not similar. q is the amount of heat that the system absorbs or releases, whereas DeltaH, or enthalpy, is the amount of heat that the system absorbs or releases only when the pressure is constant.

RalphGuevarra

Heat transfers energy due to temperature differences, while enthalpy is the amount of heat released or absorbed in a reaction under constant pressure.

RalphGuevarra

You do not have to calculate to find Cp of water because it is given in the table.

RalphGuevarra

Yes
Breaking bond requires energy --> enthalpy (positive) --> endothermic
Forming bond releases energy --> enthalpy (negative) --> exothermic

RalphGuevarra

Yes, Delta U is a state function because the path to get to the final value does not matter since they only depend on the state of the system that is independent

RalphGuevarra

q and DeltaH are not the same. q is the amount of heat absorbed or released by the system, while DeltaH, or enthalpy, is the amount of heat absorbed or released by the system only at constant pressure

RalphGuevarra

qp=ΔH are always equal if it's for constant pressure, but if that is not the case, then they are not always equal

RalphGuevarra

Hi,

Can someone show me how to solve part A? I use the equation n=PV/RT to find the moles and then w=-nRTln(v2/v1), but I keep getting the wrong answer.

RalphGuevarra

Hi,

Can someone explain to me how to find the change of entropy for gas, please? I used the formula delta S = nR ln(V2/V1) then delta S = Cv ln(T2/T1)

but I keep getting the wrong answers.

RalphGuevarra

Hi,

No, it shouldn't matter which q is negative. The negative is commutative, so it does not matter. But it helps with understanding the problem if the +q is on the side that gained heat, while the -q is on the side that loses heat.

RalphGuevarra

Hi Mathangi,

Can you please show me how to do it? I feel like I am using the correct formulas to find the deltaU but I am making some mistakes in calculation, and I could not figure out what I did wrong. Thank you!

RalphGuevarra

Hi,

Can someone explain how to the deltaU on this problem? I tried to assume that work was O, but it was wrong. Then I tried to use PV=nRT to find the w and then solve for deltaU with the formula deltaU=q+w, but my answer was still incorrect. Any help would be much appreciated! Here is the question:

RalphGuevarra

Hi,
I am having trouble with this question. Can someone explain or explain how to answer this question, please? Any help would be much appreciated! Here is the question:

RalphGuevarra

Hi,

Can someone explain how to solve part a because I've been trying and could not get the correct answer? Thank you!

RalphGuevarra

Hi, Since they give Kb and pH, we are going to use the given base to get pOH pOH = 14 - pH (9.462) --> pOH = 4.538 then use that pOH to find the [OH-]=[BH+] [OH-] = 10^(-4.538) = 2.897x10^-5 then use this equation to find the [B]: Kb = ([OH-][BH+])/[B] Now, you find [B], to determine the percentage ...

RalphGuevarra

Hi,

I had my discussion today, and according to my TA, the answers for the worksheet are posted on bruinlearn. However, I've been looking at it on bruinlearn and can't find it anywhere. Does anyone here know where the answers for the worksheets were given to us during our discussion?

RalphGuevarra

Sweet spaghetti and for dessert is tiramisu

RalphGuevarra

Hi, Tiffany Wang

We have the same problem, but I got 0.182 for x instead of 0.21955 (which is the right value for x). Can you show your work, please? because I redo my work and I still got 0.182 for x. Thank you!

RalphGuevarra

Hi,
I am having some trouble with Achieve Question #5. I have no idea where to start or what to compute to determine the equilibrium constant, K, for the reaction of NH3 with I2. Any help would be appreciated! I've attached the problem. Thank you!

RalphGuevarra

The reaction is spontaneous when delta G is negative

CHEMISTRY COMMUNITY

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