Search found 50 matches

by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:55 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energies
Replies: 4
Views: 58

Re: Activation Energies

No, activation energies are not constant. Catalysts are a good example of this, as they increase reaction efficiency by lowering activation energy (sometimes), requiring less energy for the reaction to take place. They do so by stabilising the transition state between reactant and product. However, ...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:49 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: lnA
Replies: 3
Views: 26

Re: lnA

ln(A.e-Ea/RT) = ln (A)+ln(e-Ea/RT.
This is because ln(x.y)=ln(x)+ln(y).
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:46 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Stoichiometric Coefficients and Order of Reactions
Replies: 2
Views: 63

Re: Stoichiometric Coefficients and Order of Reactions

The sum of stoichiometric coefficients for the reactants in the slow step is equal to the order of the overall reaction. For elementary reactions, there is only a single step leading from reaction to product, hence one can directly sum the coefficients of the reactants for that reaction, without wor...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy and Energy released/absorbed
Replies: 3
Views: 67

Re: Activation Energy and Energy released/absorbed

The energy absorbed includes the activation energy needed for the reaction to take place for both endothermic and exothermic reactions. In the case of exothermic reactions, energy related on product formation is more than energy absorbed for overcoming energy barrier, and hence there is a net loss o...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:35 pm
Forum: First Order Reactions
Topic: 7B.3 Determining the order of a reaction
Replies: 2
Views: 48

Re: 7B.3 Determining the order of a reaction

The equation is bimolecular, but a first order reaction. The notation doesn't determine the order of the reaction For example, in example 7B.1, the equation is first-order in N 2 O 5 , despite there being two molecules. The notation is important when determining the rate of a multi-step reaction, bu...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:25 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius eqn.
Replies: 3
Views: 43

Re: arrhenius eqn.

In either case though, you should be able to take the temperature difference either way you wanted.
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:22 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius eqn.
Replies: 3
Views: 43

Re: arrhenius eqn.

Do you mean the van't Hoff equation?
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electromotive force
Replies: 2
Views: 18

Re: Electromotive force

I think lecture 15 was when he first introduced e.m.f. The electromotive force of the cell is the potential difference between the electrodes of a galvanic cell, in the scenario where there is very little, or no current flow. It is the maximum p.d between the cell electrodes and is symbolised as the...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Final time
Replies: 5
Views: 115

Re: Final time

Yup
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:12 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Equilibrium and Kinetics
Replies: 2
Views: 32

Re: Equilibrium and Kinetics

The equilibrium constant for a reaction, can be expressed as the ratio of rate constants i.e for a reaction with forward rate constant = k and backward reaction rate constant = k', K= k/k'. In such a scenario, a large K value implies k>>k' i.e the forward reaction is taking place at a faster rate th...
by Ipsita Srinivas 1K
Sat Mar 14, 2020 1:05 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 4
Views: 43

Re: arrhenius equation

The Arrhenius equation relates the rate constant k, to the activation energy needed for the specified reaction to proceed, the pre-exponential factor, as well as the temperature at which the reaction is taking place.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 10:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Polar head group, n. Inuit psychiatrists.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 10:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Organic, adj. Church musician.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 10:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Flame Test, n. Trial by fire.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 10:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Diglyceride, n. What you scream when you're trying to kill a glyceride.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 10:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Activation Energy, n. The useful quantity of energy available in one cup of coffee.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 9:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Every dipole has its moment.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 9:54 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Wanted by the Law: Schrodinger's Cat, Dead And/Or Alive
by Ipsita Srinivas 1K
Fri Feb 28, 2020 9:54 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

The noble gases walk into a bar. No one reacts.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 9:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Random Person: Why do you react violently when we put you in H20?
Chemistry Cat: Because my race contains iron, lithium and neon = FeLiNe origins.
by Ipsita Srinivas 1K
Fri Feb 28, 2020 9:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Q: How did oxygen's date with potassium go?
A: OK
by Ipsita Srinivas 1K
Sat Feb 15, 2020 2:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Post Midterm Trauma
by Ipsita Srinivas 1K
Sat Feb 15, 2020 2:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Potential
Replies: 4
Views: 62

Re: Cell Potential

Electrical energy, or here, current flow is caused by the motion of electrons. The potential is determined by the electron difference.
by Ipsita Srinivas 1K
Sat Feb 15, 2020 2:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Potential
Replies: 4
Views: 62

Re: Cell Potential

The half redox reactions are related to the cell voltage in terms of the net loss and gain of electrons at the ends of the cell - in an electrochemical cell, the electrodes have the 'potential' to gain electrons (reduction potential); the difference in this potential determines which one will be an ...
by Ipsita Srinivas 1K
Thu Feb 13, 2020 11:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.39 HW
Replies: 1
Views: 57

Re: 5.39 HW

I believe the table they're actually referring to is table 5G.2 which has the equilibrium constant for the reaction at 298K.
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

What do you do with a dead chemist? Barium.
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

What did the thermometer say to the graduated cylinder?
"You may have graduated but I've got many degrees."
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

What do you call a tooth in a glass of water? A one molar solution.
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

If Iron Man and Silver Surfer teamed up, they'd be alloys.
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Old chemists never die, they just stop reacting.
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

A proton and a neutron were walking down the street. The proton says, "Stop, I dropped an electron. Help me look for it." The neutron asks, "Are you sure?" The proton replies, "Yes, I'm positive."
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:30 pm
Forum: Calculating Work of Expansion
Topic: Reversible Expansion
Replies: 1
Views: 37

Re: Reversible Expansion

My logic is that because both the backward and forward reactions are occurring at the same rate, there isn't really a direction or preference for the system. For irreversible reactions, there is a clear energy flow and even a small imbalance in pressure or temperature conditions isn't going to affec...
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4C.3
Replies: 1
Views: 51

Re: 4C.3

Okay, the temperature bit super weird because the actual textbook (not the solutions manual) has all the odd-numbered answers and it's only given a temperature change for part b = 373 K. I think the 5.025 g is the moles of Kr given converted to grams, over the molar mass of Kr, which is approximatel...
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:04 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimeter
Replies: 4
Views: 52

Re: Calorimeter

You can use either? Assuming that no heat is lost to the surroundings, the q value should be same whether you calculate heat gained by the calorimeter or heat lost by the system; it really depends on whichever is more convenient for you, and the data given. But you cannot use the heat capacities int...
by Ipsita Srinivas 1K
Thu Jan 30, 2020 10:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4B.9
Replies: 3
Views: 35

Re: 4B.9

Yeah, but even if q is zero for an adiabatic process, delta U will still be = q + w. If you want an equation which states that delta U = (only) q, it is irrelevant what the q value actually is; the w value has to be zero for the statement to be true. Here, because we know it is an adiabatic process,...
by Ipsita Srinivas 1K
Thu Jan 30, 2020 9:55 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Process
Replies: 1
Views: 27

Re: Reversible Process

A reversible process is a process where even a small change can cause either work to be done on the system, or by it. In the examples we've learnt, the reversible process is the expansion of a gas under constant temperature, but changing pressure. The external pressure applied on the system is alway...
by Ipsita Srinivas 1K
Sat Jan 25, 2020 10:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Because we all need radioactive decay in our lives
by Ipsita Srinivas 1K
Sat Jan 25, 2020 10:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

A good ol' cartoon
by Ipsita Srinivas 1K
Thu Jan 23, 2020 5:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: hw question 4B.3
Replies: 2
Views: 101

Re: hw question 4B.3

I know this isn't a satisfactory answer, but the textbook might just be wrong? It seems weird to me that the work done is approximately 10 times more than the internal energy change! (982 J vs 9000 J)
by Ipsita Srinivas 1K
Thu Jan 23, 2020 4:32 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Prep for Test 1
Replies: 16
Views: 163

Re: Prep for Test 1

Does anyone know if we'll be given a periodic table or are we supposed to know some common mass values?? I'm assuming we will be expected to know molar conversions and stuff like that
by Ipsita Srinivas 1K
Thu Jan 23, 2020 4:29 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Acids and Bases
Replies: 6
Views: 66

Re: Acids and Bases

But what about the homework questions from 6E (1 and 3)?? Those dealt with polyprotic acids. If someone could explain them to me, that'd be really helpful!
by Ipsita Srinivas 1K
Fri Jan 17, 2020 9:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Dilution
Replies: 1
Views: 21

Re: Dilution

I'm not sure but I'm guessing that's true? I am assuming that the solute is causing dissociation of H2O and I'm thinking since there is a reduction in solute moles for a given volume of solution, there will also be less dissociation of water into [H3O+] and [OH-].
by Ipsita Srinivas 1K
Fri Jan 17, 2020 9:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook question 6.19
Replies: 2
Views: 32

Re: Textbook question 6.19

Which section of chapter 6 are you referring to (assuming you are talking about a chapter 6 question)? There are three/four sections ( eg. 6A, 6D)!
by Ipsita Srinivas 1K
Thu Jan 16, 2020 3:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gas and Le Chatliers
Replies: 7
Views: 73

Re: Inert Gas and Le Chatliers

Adding an inert gas to a system in equilibrium at constant volume doesn't effect the equilibrium. However, when adding an inert gas to a system in equilibrium at constant pressure the the total volume will increase. I'm kinda confused here; won't the rate of the reaction change if there is an inert...
by Ipsita Srinivas 1K
Wed Jan 15, 2020 6:50 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: HW 5J.5 part C
Replies: 3
Views: 68

Re: HW 5J.5 part C

1.Assume volume of all reactants and products are 0.1 M. (you can take any value!) Then, K c = [H 2 O] 6 [NO] 4 /[O 2 ] 5 [NH 3 ] 4 K c = (0.1) 6 (0.1) 4 /(0.1) 5 (0.1) 4 = 0.1. 2. As pressure is increased by compression i.e volume decreases, we can say that the local concentrations of all the react...
by Ipsita Srinivas 1K
Wed Jan 15, 2020 6:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1409506

Re: Post All Chemistry Jokes Here

Elf 1: Why does Santa sound like -
Santa: He He He *squeaky voice af*
Elf 2: Oh, he's ingested some helium
by Ipsita Srinivas 1K
Wed Jan 08, 2020 1:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gibbs free energy
Replies: 3
Views: 28

Re: Gibbs free energy

Idk if my explanation above makes sense because it's so long, but basically the difference in Gibbs energy (the reaction Gibbs energy) has a standard value at equilibrium (which is zero). If the actual value during reaction is not zero, sorta like Le Chateliers' principle, the reaction will proceed ...
by Ipsita Srinivas 1K
Wed Jan 08, 2020 1:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gibbs free energy
Replies: 3
Views: 28

Re: Gibbs free energy

I believe the textbook talks about the “reaction Gibbs energy,” which is the difference between the molar free energies of the products and reactants at any stage of the reaction (to quote the txtbk). Here the Gibbs free energy isn't zero, but the change in Gibbs free energy (which is labelled as re...
by Ipsita Srinivas 1K
Tue Jan 07, 2020 1:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Keq vs Kc
Replies: 6
Views: 160

Re: Keq vs Kc

Ok, just to clarify, Kc and Kp are just types of Keq, and you label the equilibrium constant depending on whether Keq is calculated using partial pressure or molar conc. ?

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