CHEMISTRY COMMUNITY

Emily Vargas 2I

To figure out the effect of each reactant on the rate you'll want to compare two experiments that differ in the concentration of only one reactant while the concentrations of the other reactants are held constant.

Emily Vargas 2I

It should be endothermic if i'm not mistaken because of the fact that it's a phase change from solid --> gas. I hope this helps!

Emily Vargas 2I

I'm really into medical innovation so this is a cool mix of chemistry and it's application to future health innovations!
https://www.newscientist.com/article/2365043-glass-made-of-amino-acids-can-be-3d-printed-and-dissolves-in-the-body/

Emily Vargas 2I

I think it was mentioned that it would be explicitly stated in the question

Emily Vargas 2I

Why do chemists enjoy working with ammonia? Because it’s pretty basic stuff!

Emily Vargas 2I

Why was the mole of oxygen molecules excited when he walked out of the singles bar? Because he got Avogadro’s number!

Emily Vargas 2I

Differential = Rate of RXN dependent on Reactant Concentration
Integrated = Reactant Concentration dependent on Time

Emily Vargas 2I

I think it's also valuable to recall the different parts of the Arrhenius equation when working this out, I'll have it listed below! > rate constant, k > the reaction at each temperature, T > the activation energy, Ea > is the universal gas constant (8.3145J⋅mol−1⋅K−1), R This is the equation you'll...

Emily Vargas 2I

I would think that this is because, unlike fossil fuels, green energy sources release less carbon emissions. To add on to that these sources are renewable and demand less harvesting wise over the long terms. If you consider the process for continuously gathering fossil fuels and compare that to the ...

Emily Vargas 2I

Start by balancing the charge in the half‑reactions by adding electrons.Then, balance the number of electrons transferred in each half-reaction so that it is the same in both half-reactions. In this case, the lowest common multiple is 2 e−. Once you do this sum the reactions and cancel out the elect...

Emily Vargas 2I

You'd use the Van Hofff equation when calculating for the equilibrium constant (K) whenever there is a temperature change. I hope this helps!

Emily Vargas 2I

Correct, when delta G is at zero this is an indicator that no work can be done since G represents Gibbs ability to do work.

Emily Vargas 2I

Using what I discussed in class, and the example I did in class: ANODE (LEFT) || CATHODE (RIGHT) Cu(s) | Cu 2+ (aq) || Fe 3+ (aq), Fe 2+ (aq) | Pt(s) Put the conducting solids (electrodes) on the outside and aqueous next to the salt bridge. Always include phase in the equation and cell diagram. In ...

Emily Vargas 2I

Thank you Dr. Lavelle for this quarter,

I'm honestly terrible at chemistry but you've made it manageable :)

Emily Vargas 2I

What do you call a clown in jail? a Silicon :)

Emily Vargas 2I

I always recommend investing in some quality sleep, and grounding exercises like counting things you see around you. Most importantly remember that you can do it and not to overwhelm yourself if you get stuck, just breathe and push through!

Emily Vargas 2I

What does K' (aka K prime) refer to when solving for the equilibrium constant, K. What does it represent?

Emily Vargas 2I

In the 3/6 lecture I was a bit confused of what exactly the professor meant when we "integrated both sides" for both the 1st order reaction and 2nd order reaction breakdown. If anyone can explain what's going on I'd really appreciate it! [img] Screenshot%202023-03-18%20132524.png [/img][im...

Emily Vargas 2I

I keep trying to apply the second order kinetics equation 1/[A]t = kt + (1/[A]0) but it doesn't seem to be working, if anyone can explain the steps they did to get the correct answer I'd really appreciate it! A particular reactant decomposes with a half‑life of 125s when its initial concentration is...

Emily Vargas 2I

Hi can anyone help with balancing this problem week 7/8. Balance the reaction, including the phase (solid, liquid, etc.) of each species. The reaction takes place in basic aqueous solution.

MnO−4(aq)+S2−(aq)⟶S(s)+MnO2(s)

Emily Vargas 2I

First, convert 3.36 min to seconds and multiply it by 500 W (recall that W is J/s) to get the energy supplied by the heater in J = 1.01 x 10^5 J Find the molar mass difference (361.6 g−90.33 g) and convert it to moles. Get the enthalpy of vaporization by 1.01 x 10^5 J /molar mass difference in mole...

Emily Vargas 2I

Hi I'm not sure what I'm getting wrong but if anyone can explain the steps they did to get ΔHvap of C4H10 and ΔSvap of C4H10? Three liquid samples of known masses are heated to their boiling points with the use of a heater rated at 500.0 W. Once the boiling points of each sample are reached, the sam...

Emily Vargas 2I

Is there any rule of thumb or general advice to remember the differences/purposes between zero, first, and second-order reactions?

Emily Vargas 2I

I'm reviewing 3/3 lecture (timestamp - 41:01) and I was just a bit confused as to why we compared experiments 1 & 2 and also 2 & 3. Why not other pairings like 1 & 3? Also, why does n=1 when it states rate doubles when we compare experiments 2 & 3. Any clarification would be really h...

Emily Vargas 2I

whats the difference between the ∆G = -nFE and ∆G°= -nFE°? In what situation would you use one over the other?

Emily Vargas 2I

what does it mean when Ecell is > or < E(knot)cell?

Emily Vargas 2I

In 2/22 lecture I was a bit confused about this part (timestamp 15:25): Balance Half Reactions & Write Cell Reaction - Cathode: 2Fe3+ + 2e- --> 2Fe2+ E = 0.77 V - Anode: Cu --> Cu2+ + 2e- E = -0.34 V ------------------------------------------------------------------------ Redox RXN: 2Fe3+ + Cu -...

Emily Vargas 2I

What does it mean when a reduction is spontaneous? In the 2/17 lecture, the slides stated that " + value means reduction is spontaneous." Can anyone is able to clarify/explain what this means exactly?

Emily Vargas 2I

Im reviewing the 2/17 lecture and was a bit confused (at timestamp 14:06) as to why in the Oxidation reaction it only focuses on the Fe, but in the Reduction reaction includes H+ and H2O. If anyone could explain why this is the case I'd really appreciate it! This is how it's shown: Oxidation: 5Fe2+ ...

Emily Vargas 2I

Hi, I'm still a bit confused on how to figure out the oxidation number for an element in a compound. Also does it vary depending on which side of the reaction it's on, if it's a product or reactant?

Emily Vargas 2I

While doing practice problems I find that I'm using the wrong R constant from time to time (ie. 8.314 vs 8.206*10^-2). Is there a rule of thumb for when I should use each one?

Emily Vargas 2I

In lecture 2/1 the topic of work done on or by a system was a bit confusing and I just wanted to see if anyone could clarify if this is right or correct me. So if work is done on a system and the volume of that system is decreasing this would be represented with this equation: w=P*ΔV. Then if work i...

Emily Vargas 2I

In the 1/25/2023 lecture, I was getting confused if it was that "products have a higher enthalpy than reactants" or if it's "reactants have a higher enthalpy than products" and why? If anyone can explain

CHEMISTRY COMMUNITY

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Re: Achieve week 8-10 #7

Re: Final Review

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Re: How to determine the slow step?

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

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Re: Achieve 20 week 8-10

Re: "Green" energy

Re: week 7-8 Homework #2

Re: van't hoff equation

Re: When ∆G = 0 at equilibrium

Re: Cell Diagram and Ecell [ENDORSED]

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K' Confusion

Integrating Both Sides for Order RXN

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Re: Achieve Week 5/6 Question #7

Achieve Week 5/6 Question #7

Comparing order differential rate laws

Comparing Experiments

delta G versus delta G (knot)

Le Chatelier's Principle

writing cell reactions

Spontaneous

H2O & H+ in redox reactions

Determining Oxidation Numbers

Gas Constant Application

Work in terms of volume expansion or decreasing

Products/Reactants & Enthalpy