Search found 50 matches

by Shreya Ramineni 2L
Wed Mar 14, 2018 11:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

Q: What do you call a tooth in a glass of water?
A: A one molar solution.
by Shreya Ramineni 2L
Wed Mar 14, 2018 11:22 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Elementary reactions
Replies: 6
Views: 167

Re: Elementary reactions

Elementary reactions are the steps within an overall reaction; the slowest one in a reaction mechanism provides the overall rate law!
by Shreya Ramineni 2L
Wed Mar 14, 2018 11:19 pm
Forum: General Rate Laws
Topic: Unimolecular
Replies: 5
Views: 298

Re: Unimolecular

Unimolecular would be:
A--> P
Bimolecular could be:
A+A-->P
A+B-->P
by Shreya Ramineni 2L
Sun Mar 11, 2018 2:08 pm
Forum: Second Order Reactions
Topic: Differential vs Integrated
Replies: 4
Views: 273

Re: Differential vs Integrated

If you are given the concentration and time, use integrated rate law.
by Shreya Ramineni 2L
Sun Mar 11, 2018 2:07 pm
Forum: First Order Reactions
Topic: Log vs ln
Replies: 9
Views: 366

Re: Log vs ln

There isn't a need to convert from ln to log, especially because when integrated, the first order reaction provides ln.
by Shreya Ramineni 2L
Sun Mar 11, 2018 2:05 pm
Forum: Zero Order Reactions
Topic: zero order rate?
Replies: 14
Views: 427

Re: zero order rate?

This is true; rate is independent of concentration, as the differential rate law is rate=k ([A]^0=1).
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

Q: What did the chemist say when he found two isotopes of helium?
A: HeHe
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: E of a Redox [ENDORSED]
Replies: 5
Views: 438

Re: E of a Redox [ENDORSED]

E is intensive, so the amount does not affect its potential.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:39 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Trends in Increasing Reducing Ability
Replies: 5
Views: 193

Re: Trends in Increasing Reducing Ability

The more negative in potential, the more likely the substance is to be oxidized/work as a reducing agent. Therefore it has more of a reducing power.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When do you need to include Pt? [ENDORSED]
Replies: 5
Views: 154

Re: When do you need to include Pt? [ENDORSED]

If there is no solid metal state that works as the conducting electrode, you need a stable metal such as Pt to use.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:35 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation to find pH
Replies: 6
Views: 976

Re: Nernst Equation to find pH

you change the lnQ to 2.303logQ, as they are equivalent, and plug that into the equation. The -log[H+] will be the pH.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:32 pm
Forum: Balancing Redox Reactions
Topic: Cell Diagram [ENDORSED]
Replies: 7
Views: 186

Re: Cell Diagram [ENDORSED]

The phases are separated.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:29 pm
Forum: Balancing Redox Reactions
Topic: Identifying Oxi/Red Agents [ENDORSED]
Replies: 6
Views: 246

Re: Identifying Oxi/Red Agents [ENDORSED]

The reducing agent/the component with reducing power is being oxidized and vice versa.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:28 pm
Forum: Balancing Redox Reactions
Topic: Water in balancing reactions
Replies: 4
Views: 112

Re: Water in balancing reactions

Yes, it is used to balance out oxygens and the hydrogens in redox reactions.
by Shreya Ramineni 2L
Mon Feb 26, 2018 1:14 pm
Forum: Balancing Redox Reactions
Topic: Recognizing a redox reaction in acidic or basic solution
Replies: 5
Views: 130

Re: Recognizing a redox reaction in acidic or basic solution

Yes, I'm pretty sure acidic or basic will be given.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Extensive/Intensive Property [ENDORSED]
Replies: 4
Views: 145

Re: Extensive/Intensive Property [ENDORSED]

Intensive properties do not depend on quantity while extensive do. Intensive are preferred because they are more standardized.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isobaric [ENDORSED]
Replies: 3
Views: 130

Re: Isobaric [ENDORSED]

Isobaric means constant pressure.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:29 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Assume ideal gas?
Replies: 4
Views: 112

Re: Assume ideal gas?

Yes, I think we assume ideal gases unless specified differently.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

How about the chemical workers… are they unionized?
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0k?
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When to use Q versus K [ENDORSED]
Replies: 6
Views: 367

Re: When to use Q versus K [ENDORSED]

Q is the reaction quotient while K is the equilibrium constant. You use K at equilibrium or when delta G is equal to 0. You use Q when delta G is not equal to 0.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: What does it mean for a reaction to be "thermodynamically favored?"
Replies: 6
Views: 1432

Re: What does it mean for a reaction to be "thermodynamically favored?"

Thermodynamically favorable means spontaneous, or that the reaction does not require energy in order to happen.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:18 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.5 [ENDORSED]
Replies: 11
Views: 351

Re: Homework 9.5 [ENDORSED]

Its based on system vs. surroundings and where the heat is transferring. Because heat goes from hot to cold, the 800 K part is losing and has a negative sign while the 200 K is gaining and has a positive sign.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:17 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.7
Replies: 7
Views: 173

Re: 9.7

We just need to know that its for a monatomic ideal gas atom. The C=5/2 R is on the formula sheet if I remember correctly!
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:03 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Difference between systems? [ENDORSED]
Replies: 8
Views: 225

Re: Difference between systems? [ENDORSED]

An open system can transfer matter and/or energy. A closed system system can transfer energy not matter. An isolated system cannot transfer either.
by Shreya Ramineni 2L
Sat Feb 03, 2018 2:01 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: ideal cooler [ENDORSED]
Replies: 5
Views: 212

Re: ideal cooler [ENDORSED]

Ideal means no heat or matter transfer between system and surroundings, so the system is isolated.
by Shreya Ramineni 2L
Fri Jan 12, 2018 4:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 787315

Re: Post All Chemistry Jokes Here

Why did the acid go to the gym?

To become a buffer solution!
by Shreya Ramineni 2L
Fri Jan 12, 2018 4:00 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity vs. Specific Heat Capacity
Replies: 6
Views: 174

Re: Heat Capacity vs. Specific Heat Capacity

Heat Capacity is the amount of heat required to raise the temperature of an object by 1 deg C and is extensive. However, specific heat capacity is intensive and is the amount of heat required to raise the temperature of 1 gram of a substance by 1 deg C. Specific heat is preferred over heat capacity.
by Shreya Ramineni 2L
Fri Jan 12, 2018 3:49 pm
Forum: Phase Changes & Related Calculations
Topic: Intensive vs. Extensive
Replies: 5
Views: 271

Re: Intensive vs. Extensive

Intensive properties do not depend on amount of the substance while extensive properties do. An example of an intensive property is density, while extensive include work and heat. For calculations, an extensive divided by an extensive gives an intensive property, which is seen with heat capacity and...
by Shreya Ramineni 2L
Mon Dec 04, 2017 3:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q [ENDORSED]
Replies: 7
Views: 422

Re: Q [ENDORSED]

Q is the reaction quotient and represents the ratio of products and reactants at any point within reaction. When compared to K it provides insight into how the reaction will go.
by Shreya Ramineni 2L
Mon Dec 04, 2017 3:20 pm
Forum: Ideal Gases
Topic: Units of Partial Pressure
Replies: 7
Views: 414

Re: Units of Partial Pressure

Partial pressures are in atm.
by Shreya Ramineni 2L
Mon Dec 04, 2017 3:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Table 11.2
Replies: 4
Views: 169

Re: Table 11.2

K=Kp which is for gases and partial pressures but Kc is for molarity.
by Shreya Ramineni 2L
Mon Dec 04, 2017 3:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ch 11
Replies: 3
Views: 169

Re: ch 11

Due to what is given, one must find the molarity so you have to divide by the volume to get it.
by Shreya Ramineni 2L
Mon Nov 27, 2017 1:27 pm
Forum: Ideal Gases
Topic: R in PV=nRT [ENDORSED]
Replies: 7
Views: 310

Re: R in PV=nRT [ENDORSED]

R is the ideal gas constant, and its value depends on the units of P, V, n, and T within the ideal gas law.
by Shreya Ramineni 2L
Mon Nov 27, 2017 1:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs vs. Bonding Pairs
Replies: 6
Views: 284

Re: Lone Pairs vs. Bonding Pairs

Lone pairs take up more space that bonding pairs, which leads them to have greater repulsion.
by Shreya Ramineni 2L
Mon Nov 27, 2017 1:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs [ENDORSED]
Replies: 3
Views: 150

Re: Lone Pairs [ENDORSED]

No, it doesn't affect the shape.
by Shreya Ramineni 2L
Mon Nov 27, 2017 1:19 pm
Forum: Hybridization
Topic: Pi Bonds vs. Sigma Bonds
Replies: 7
Views: 262

Re: Pi Bonds vs. Sigma Bonds

Single bonds are sigma bonds. Double bonds are a sigma bond and a pi bond. Triple bonds are a sigma bond and 2 pi bonds.
by Shreya Ramineni 2L
Mon Nov 13, 2017 8:04 pm
Forum: Hybridization
Topic: Filling electron shells [ENDORSED]
Replies: 3
Views: 273

Re: Filling electron shells [ENDORSED]

4s is lower in energy than 3d, so it gets filled up first.
by Shreya Ramineni 2L
Mon Nov 13, 2017 8:02 pm
Forum: Hybridization
Topic: Writing out the Hybridization [ENDORSED]
Replies: 4
Views: 244

Re: Writing out the Hybridization [ENDORSED]

The number of e- density areas equal the hybridization. So for example, a molecule with 1 s and 1 p would have 2 hybridized orbitals and a hybridization of sp.
by Shreya Ramineni 2L
Mon Nov 06, 2017 4:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Midterm
Replies: 8
Views: 313

Re: Midterm

No, it covers fundementals through chapter 3, so the latest thing covered is resonance/bonds.
by Shreya Ramineni 2L
Mon Nov 06, 2017 4:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 142

Re: Bond Angles

It's dependent on the structure, so it would help to visualize the structure and use it to approximate bond angles.
by Shreya Ramineni 2L
Mon Nov 06, 2017 4:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Magnetic Quantum Number
Replies: 6
Views: 284

Re: Magnetic Quantum Number

The range for ml is -l to l, so its dependent on the subshell (l) of the element.
by Shreya Ramineni 2L
Mon Nov 06, 2017 4:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Spin Quantum Number [ENDORSED]
Replies: 12
Views: 659

Re: Electron Spin Quantum Number [ENDORSED]

the quantum spin number can haven either +/- 1/2.
by Shreya Ramineni 2L
Mon Nov 06, 2017 4:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: trigonal pyramidal
Replies: 3
Views: 143

Re: trigonal pyramidal

Trigonal pyramidal is three bonding pairs and one lone pair.
by Shreya Ramineni 2L
Sat Oct 28, 2017 4:30 pm
Forum: Lewis Structures
Topic: Lewis Structures- resonance [ENDORSED]
Replies: 4
Views: 253

Re: Lewis Structures- resonance [ENDORSED]

For resonance, you draw all of the possible structures and connect them by showing resonance through double sided arrows (<---->).
by Shreya Ramineni 2L
Sat Oct 28, 2017 4:28 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of 0 [ENDORSED]
Replies: 3
Views: 535

Re: Formal Charge of 0 [ENDORSED]

A formal charge of 0 is the most favorable because it is the most stable.
by Shreya Ramineni 2L
Sat Oct 28, 2017 4:27 pm
Forum: Formal Charge and Oxidation Numbers
Topic: How to figure out formal charge? [ENDORSED]
Replies: 6
Views: 726

Re: How to figure out formal charge? [ENDORSED]

Formal charge is found by the formula FC= V - (L+(s/2)) where v is the amount of valence electrons of the atom, L is the amount of lone pair electrons, and s/2 is the amount of bonds shared, which can be figured out by divided the electrons shared by 2.
by Shreya Ramineni 2L
Sun Oct 22, 2017 2:16 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer/Lyman Series [ENDORSED]
Replies: 7
Views: 334

Re: Balmer/Lyman Series [ENDORSED]

Balmer is when an electron jumps down to n=2 from a higher energy level and Lyman is when it jumps down to n=1.
by Shreya Ramineni 2L
Sun Oct 22, 2017 2:10 pm
Forum: DeBroglie Equation
Topic: Should velocity always be in m.s. when solving? [ENDORSED]
Replies: 11
Views: 732

Re: Should velocity always be in m.s. when solving? [ENDORSED]

Velocity should always be in m/s with chemistry calculations.

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