CHEMISTRY COMMUNITY

Abigail Volk 1F

Because t cannot equal 0, but Q=0 is an adiabatic process always occurring in a closed system?

Abigail Volk 1F

An isothermal change is when the temperature remains constant... but how is it able to exchange heat with its surroundings without the temperature rising or lowering? Would isothermal changes always be apart of an isolated system then?

Abigail Volk 1F

On one of the bullet points on the electrochemistry outline says "understand how a concentration cell works and give an example." What is an example of cell concentration, or what is Lavelle looking for when answering this?

Abigail Volk 1F

Just to be clear, is the reaction profile is just a diagram that shows and x axis (potential energy) and y axis (progress of a reaction) with reactants, products, and activation energy? Is there anything else that needs to be know specifically for the reaction profile besides that they can be endoth...

Abigail Volk 1F

In part a) you plug in 1/ .84/16 for [A] which flips and is basically 16/.84 but in part b) you get 1/ .84/4 for [A] and you don’t flip this one and get 1/.21. Why do you flip part a but not part b fraction wise?

Abigail Volk 1F

Can someone explain how a catalyst can lower activation energy but increase the rate of a reaction? I need help with the conceptual understanding of this

Abigail Volk 1F

The three different classifications of thermodynamically unstable compounds include labile, non labile, and inert.
Will we need to be able to identify the different types within an equation or would it be given in a question? And if we have to identify it how would we be able to?

Abigail Volk 1F

What are the four cases of spontaneity on ΔS and ΔH for a system at constant T and P? Whats an easy way to memorize these?

Abigail Volk 1F

When using the Boltzmann's equation, there is a thermodynamic approach and a molecular approach, whats the difference between the two? When would you know to use which one?

Abigail Volk 1F

What is the difference between Isobaric (P) and Isochoric (V) and how do you identify it in an equation?

Abigail Volk 1F

What is an infinitesimal change and how do you identify it?

Abigail Volk 1F

Why cant a single standard galvanic cell have a potential larger than about 6 V?

Abigail Volk 1F

Whats the difference between primary and secondary cells and how would you be able to spot which is which in a problem?

Abigail Volk 1F

What's the difference between an average reaction rate and an unique average reaction rate? And how would you be able to distinguish it in a problem?

Abigail Volk 1F

Can someone explain the isolation Method and in what circumstance you would use it?

Abigail Volk 1F

How do you predict the spontaneous direction of a redox reaction using standard reduction potentials.

Abigail Volk 1F

What's the definition of the electromotive force (emf, ℰ)? and why does it represent the maximum potential difference?

Abigail Volk 1F

For an electrolytic cell, is it possible to produce a gas for an aqueous solution? Why? and if so is it at the cathode or anode?

Abigail Volk 1F

Is the anode a negative terminal for a Galvanic cell because the anode is the source of the electrons where oxidation occurs?
I need help with clarification

Abigail Volk 1F

To understand the Nernst equation correctly is it that...
Increasing the concentration of the reactants will increase the value of Ecell?
Is this all that needs to be known for this equation?

Abigail Volk 1F

I'm still very confused on how to calculate the number of microstates in a particle. Can some one simplify it in a way thats easier it understand??

Abigail Volk 1F

First law of thermodynamics - enthalpy (heat)
second law of thermodynamics - entropy (disorder)
third law of thermodynamics - entropy of a perfect crystal is equal to zero
Is this the general basis of the laws of thermodynamics and/or is this an ok way of thinking of it?

Abigail Volk 1F

I know that ΔS and ΔSsurr can each be either positive (+) or negative (–) but im still confused on how to figure out the spontaneity of these. can someone explain the four cases?

Abigail Volk 1F

if the is a net production of gas in a reaction then ΔS° is positive and if there is a net consumption of gas in a reaction then ΔS° is negative? is this right?

Abigail Volk 1F

Given the temperature change of a calorimeter, how do you determine the heat output of a reaction?

Abigail Volk 1F

how do you recognize when a substance is in its standard state?

Abigail Volk 1F

Can someone better explain/distinguish the difference between these two or are they the same thing?
Standard enthalpies of formation vs standard enthalpies of reaction

Abigail Volk 1F

The question asks, "A 50.0-g ice cube at 0.0 'C is added to a glass containing 400.0 g of water at 45.0 'C. What is the fi nal temperature of the system (see Tables 8.2 and 8.3)? Assume that no heat is lost to the surroundings." how do you find the heat that is absorbed vs the heat that is...

Abigail Volk 1F

the homework question is "A gas sample in a cylinder is supplied with 524 kJ of energy as heat. At the same time, a piston compresses the gas, doing 340 kJ of work. What is the change in internal energy of the gas during this process?" To answer this question would it just be 524+340 to eq...

Abigail Volk 1F

The question states "Oxygen difluoride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat: OF2(g) + H2O(g) ---> O2(g) + 2 HF(g) Delta H = -318 kJ What is the change in internal energy for the reaction of 1.00 mol OF2?" Are we supposed to use...

Abigail Volk 1F

what is a structural isomerism? and how do you find it in this compound - [Cr(en)3][Co(ox)3]

Abigail Volk 1F

The questions says, "what is the shape of the ClO2+ ion? what is the expected OClO bond angle?" I'm still slightly confused on how to determine bond angles. Can you use the example in the question to explain how to determine the bond angle? thanks

Abigail Volk 1F

In this homework problem it asks us to predict which of the following pairs of ions would have the greatest coulombic attraction in a solid compound: a) K+,O-
b) Ga3+, O2- c) Ca2+, O2-
what is a coulombic attraction, and how do you find it in this question?

Abigail Volk 1F

The question asks, " The value of Kw for water at body temperature (37 degrees Celcius) is 2.1x10^-14. what is the molarity of H3O+ ions and the pH of neutral water at 37 degrees Celcius? what is the molarity of OH- in neutral water at 37 degrees Celcius? I'm having a hard time understanding th...

Abigail Volk 1F

The question states, "balance the following equations using the smallest whole number coefficients, then write the equilibrium expression Kc for each reaction:". what is it asking for when it asks to use the smallest whole number? And an example given was a) CH4(g) + Cl2(g) <=> CHCl3(g) + ...

Abigail Volk 1F

how can I check how many times I've posted? I want to make sure I can get all my points for posting but I'm not sure where to go to find it. Thanks!

Abigail Volk 1F

how do you know which prefix to use? For example, di or bis, tri or tris, tetra or tetrakis.

Abigail Volk 1F

How do you know when a gas is ideal?

Abigail Volk 1F

By watching the modules posted by Dr. Lavelle, will we be able to get all the information needed for chapter 11 in preparation for test #4?

Abigail Volk 1F

What do we specifically need to know from chapter 17 for the test? I wasn't in class on Wednesday so maybe I missed some of that information. Thank you!

Abigail Volk 1F

whats the definition of a lewis acid and lewis base? Doesn't one of them give up an electron and the other absorb one?

Abigail Volk 1F

Does anyone know when we will be getting our scores back from the midterm?

Abigail Volk 1F

how do you find the bond order? why is the bond order in H2 equal to 1?

Abigail Volk 1F

Do we need to know this and if so what is a metallic bond or what does it do?

Abigail Volk 1F

Can someone explain the Coulomb potential energy formula?

Abigail Volk 1F

How do you determine whether a Lewis structure has a single or double bond?

Abigail Volk 1F

I am out of chemistry jokes, I should zinc of a new one.

Abigail Volk 1F

Do you have 11 protons?
Because you are sodium fine ;)

Abigail Volk 1F

"oh my gosh, I've lost a neutron"
"Don't worry; you can get a new one "free of charge."

Abigail Volk 1F

In the table, what conversion formula would we use to find wave length and energy of photon from the frequency 8.7x10^14 Hz?

Abigail Volk 1F

When trying to balance a chemical equation and it includes a triangle (delta) symbol, does that affect how I balance the equation?

Abigail Volk 1F

How do you find the excess reactant in an equation? How do you find a limiting reactant? Are both required in an equation?

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