CHEMISTRY COMMUNITY

isabella reeves 1D

hello! Can someone please help with these parts of problem 7? For the reaction 2A(g)+2B(g)+C(g)⟶3G(g)+4F(g) the initial rate data in the table was collected, where [A]0, [B]0, and [C]0 are the initial concentrations of A, B, and C, respectively. Experiment [A]0 (mmol⋅L−1) [B]0 (mmol⋅L−1) [C]0 (mmol⋅...

isabella reeves 1D

hiranya sundar 2D wrote:Let me know if you can see this!

Screenshot 2023-03-14 113102.png

I can! thank you so so much

isabella reeves 1D

Can someone please explain how we're supposed to solve this problem? The presence of a catalyst provides a reaction pathway in which the activation energy of a reaction is reduced by 63.00 kJ⋅mol−1. Uncatalyzed: A⟶B Ea=133.00 kJ⋅mol−1 Catalyzed: A⟶B Ea=70.00 kJ⋅mol−1 Determine the factor by which th...

isabella reeves 1D

Since DELTA H is negative we assume this reaction is exothermic. If we look at a reaction diagram, the productions must have gone up by 53 kJ because that's the activation energy, and decrease by (53+24) to get the products value. 53 - (53+24) = -24 = DELTA H. To get the opposite reaction, we look ...

isabella reeves 1D

Thank you, this did help!

isabella reeves 1D

Can someone please walk me through the steps of this problem? I don't really know where to start.

A certain reaction has an enthalpy of ΔH=−24 kJ and an activation energy of Ea=53 kJ. What is the activation energy of the reverse reaction?

Ea(reverse) = ? kJ

isabella reeves 1D

Hello! Can someone please walk me through this problem? I can't seem to get it right. The reaction A+B⟶C+Drate=k[A][B]2 has an initial rate of 0.0970 M/s. What will the initial rate be if [A] is halved and [B] is tripled? initial rate = ? M/s What will the initial rate be if [A] is tripled and [B] i...

isabella reeves 1D

I don't know where to start in solving this question. Can someone walk me through it or give tips?

The rate of the given reaction is 0.540 M/s.
A+3B⟶2C
What is the relative rate of change of each species in the reaction?
Δ[A]/Δt = ?
Δ[B]/Δt=?
Δ[C]/Δt=?

isabella reeves 1D

Thank you so much! These explanations make a lot of sense, especially remembering the reactions learned in the LS 7 series relating to these

isabella reeves 1D

Right, thank you so much! Didn't realize how much I had forgotten from high school chem

isabella reeves 1D

Hi! When separating CuCl it becomes Cu+ and Cl-, so the reduction half reaction has Cl2 as reactant and 2Cl- (coefficient of 2 to make it balanced) as the product. Since the 2Cl- has a negative two charge, there should be two electrons on the reactants side. Hope this helps! This might be a stupid ...

isabella reeves 1D

Thank you! That makes a lot of sense, I missed the part of it being spontaneous

isabella reeves 1D

Can someone please explain why activation energy is decreased when a catalyst is added? The feedback and solution on Achieve aren't very clear to me. How are the following aspects of a reaction affected by the addition of a catalyst? Increased, Decreased, or Not Affected? the answer bank: rate of th...

isabella reeves 1D

I think I remember that Professor Lavelle had said that for calculating standard cell potentials, we should put the larger, more positive E∘ in front so that the E∘cell always ends up positive. Why does the E∘cell have to be positive? I was specifically wondering about this for question 9 because th...

isabella reeves 1D

Can someone explain why for the reduction half-reaction, the e- are on the left side and in front of Cl2? Separate this redox reaction into its balanced component half‑reactions. Use the symbol e− for an electron. Cl2+2Cu⟶2CuCl Oxidation half-reaction: 2Cu⟶2Cu++2e− reduction half-reaction: 2e−+Cl2⟶2...

isabella reeves 1D

Can someone explain how to balance the following equation? I can't seem to get it right and I'm pretty sure it's from balancing oxygen wrong. Identify the oxidizing and reducing agents in the skeletal (unbalanced) reaction. Then, balance the reaction, including the phase (solid, liquid, etc.) of eac...

isabella reeves 1D

And why is the cathode reaction different in the half-reaction versus the shorthand notation?

isabella reeves 1D

For question #7 on the week 7/8 Achieve homework, why is Cl− in the center of the shorthand notation?

isabella reeves 1D

The way to find bond enthalpy is you find how many bonds are associated with a given molecule. Usually you will be given the enthalpy numbers but you need to figure out how many bonds there are. For example if you were asked to find 2 H-H bond D’s you would multiply 2 to the given enthalpy. If you ...

isabella reeves 1D

Hi, I find it best to draw out all the molecular structures in the reaction to see which bonds remain on the product side. Then, you would be able to visually see which are broken on the reactants but formed on the products. I'm not sure there's a specific way to figure this out but I hope this hel...

isabella reeves 1D

I was able to find the molar enthalpy but I can't get the molar entropy correct. Are we supposed to divide the temperature in kelvins by the molar enthalpy in J's or kJ's? and the temperature is just the boiling point in kelvins right? To find molar entropy, divide molar enthalpy in joules by the b...

isabella reeves 1D

Three liquid samples of known masses are heated to their boiling points with the use of a heater rated at 550.0 W. Once the boiling points of each sample are reached, the samples are heated for an additional 3.09 min, which results in the vaporization of some of each sample. After 3.09 min, the samp...

isabella reeves 1D

Hello! To solve this problem, we need to know three steps that involve finding the standard molar entropy of vaporization: the entropy change heating water from 59.0 °C to 100 °C, the entropy of vaporization of water at 100.0 °C, and the entropy change cooling water from 100 °C to 59 °C. To solve t...

isabella reeves 1D

I was able to find the molar enthalpy but I can't get the molar entropy correct. Are we supposed to divide the temperature in kelvins by the molar enthalpy in J's or kJ's? and the temperature is just the boiling point in kelvins right?

isabella reeves 1D

Why is free expansion of a gas irreversible?

isabella reeves 1D

when calculating for an isothermal process and the problem does not specify if it is reversible or irreversible, is any equation accurate to use?
Out of: -nRTln(V2/V1)
-PexΔV
ΔS=nRln(V2/V1)

isabella reeves 1D

How do we know which bonds are being broken and which bonds are being formed in an equation?

isabella reeves 1D

pasta! especially my dad's aglio e olio.

isabella reeves 1D

Thank you so much for the advice! I always try to save my notes so it is good to know they will be helpful in the future

isabella reeves 1D

mine would be anything chocolate or warheads !

CHEMISTRY COMMUNITY

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