Search found 59 matches
- Thu Mar 14, 2019 12:00 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Bimolecular
- Replies: 13
- Views: 2264
Re: Bimolecular
So is a bimolecular reaction another way of saying it's second order?
- Thu Mar 14, 2019 11:58 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 16
- Views: 1509
Re: Activation Energy
The hill - looking thing that comes after the reactants in energy diagrams represents the activation energy
- Thu Mar 14, 2019 11:57 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Y-Axis Units
- Replies: 2
- Views: 534
Re: Y-Axis Units
Also, the units for k are specific to each reaction, so you have to find those separately too
- Thu Mar 14, 2019 11:52 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics Plots
- Replies: 5
- Views: 1016
Re: Kinetics Plots
If you plot any of those graphs but get a curve, you know you have the wrong order reaction
- Thu Mar 14, 2019 11:51 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetically v. Thermodynamically Controlled Reaction
- Replies: 2
- Views: 558
Re: Kinetically v. Thermodynamically Controlled Reaction
can that tell you anything about the rate of the reaction?
- Thu Feb 28, 2019 5:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cathode vs anode
- Replies: 4
- Views: 546
cathode vs anode
When you are given something like H+ and H2 with Ni2+ and Ni, how do you know which pair is the cathode and which is the anode?
- Thu Feb 28, 2019 4:43 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Pt inert electrode
- Replies: 9
- Views: 1812
Re: Pt inert electrode
Is Pt(s) the only other substance you would add in any scenario?
- Thu Feb 28, 2019 4:42 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Why does reaction free energy depend on pressure and the equal constant?
- Replies: 3
- Views: 472
Re: Why does reaction free energy depend on pressure and the equal constant?
In the equation G= -RTlnK, the free energy clearly depends on K, but I'm not as sure about the pressure part. Temperature and pressure are proportional to each other by PV=nRT, so maybe that's the connection you're supposed to make?
- Thu Feb 28, 2019 4:38 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Electrochemical Series
- Replies: 2
- Views: 322
Re: Electrochemical Series
I think it is a series of elements arranged in order of their reduction potentials
- Thu Feb 28, 2019 4:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.9 ch 14
- Replies: 3
- Views: 420
Re: 14.9 ch 14
Can you post the question?
- Thu Feb 28, 2019 4:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E
- Replies: 4
- Views: 477
Re: E
I think it is different because it's specifically the E of the cathode and anode
- Thu Feb 28, 2019 4:33 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: "Strongly oxidizing"
- Replies: 5
- Views: 1059
Re: "Strongly oxidizing"
The more negative the E value, the stronger it is as a reducing agent, so the more positive the E value, the stronger it is as an oxidizing agent.
- Thu Feb 14, 2019 4:27 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Internal energy (U) of an isolated system
- Replies: 17
- Views: 2714
Re: Internal energy (U) of an isolated system
Closed systems can transfer only energy, and open systems can transfer energy and matter
- Thu Feb 14, 2019 4:26 pm
- Forum: Student Social/Study Group
- Topic: week 6 homework
- Replies: 2
- Views: 566
week 6 homework
What sections is the homework for this week supposed to be on?
- Thu Feb 14, 2019 4:22 pm
- Forum: Student Social/Study Group
- Topic: last problem on midterm
- Replies: 4
- Views: 859
Re: last problem on midterm
What was the problem for this one?
- Thu Feb 07, 2019 1:42 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: standard temperature
- Replies: 1
- Views: 210
standard temperature
If you are not given a temperature, are you supposed to assume that it is 298K? Or does the temperature always have to be given?
- Thu Feb 07, 2019 1:36 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: problem 4D.3
- Replies: 1
- Views: 201
problem 4D.3
The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113°C to 22.799°C. The calorimeter assembly is known to have a total heat capacity (calorimeter cons...
- Sat Feb 02, 2019 12:47 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Homework sections
- Replies: 2
- Views: 269
Homework sections
I'm slightly confused since we have been going out of order in lecture. Which of the sections in the 7th edition textbook have we covered?
- Sat Feb 02, 2019 12:46 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Standard enthalpy of formation vs. enthalpy of formation
- Replies: 3
- Views: 341
Re: Standard enthalpy of formation vs. enthalpy of formation
the per mole unit refers to the "formation" part: standard enthalpy of formation is the change in enthalpy that occurs when one mole of the substance is formed, so it is enthalpy per mole, or joules per mole
- Sat Feb 02, 2019 12:43 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Friday Lecture Notes
- Replies: 2
- Views: 288
Re: Friday Lecture Notes
It was actually that PdeltaV is significant for changes in the number of moles of gas, but it is INsignificant for reactions involving solids and liquids because there is too small of a volume change for solids and liquids to account for it in the PdeltaV expression.
- Sat Feb 02, 2019 12:39 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Forms of U Equations
- Replies: 3
- Views: 435
Re: Forms of U Equations
If we have the equations U = q + w, q = H, and w = PV, why does U = H - PV, instead of U = H + PV?
- Sat Feb 02, 2019 12:37 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Reaction Enthalpy
- Replies: 3
- Views: 467
Re: Reaction Enthalpy
Since (delta U) = (delta H) - P(delta V), if there is no change in volume (which there isn't when you're going from a solid to a liquid), P(delta V) = 0. Therefore, delta U = delta H.
- Sat Feb 02, 2019 12:32 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Delta U vs Delta H
- Replies: 6
- Views: 1602
Re: Delta U vs Delta H
Delta Hf can be found by dividing delta H by the number of moles
- Sat Feb 02, 2019 12:29 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Enthalpy vs Internal energy
- Replies: 5
- Views: 566
Re: Enthalpy vs Internal energy
I don't think there is a difference, I think the SI units for both are in joules
- Thu Jan 24, 2019 10:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: question 5i.19
- Replies: 3
- Views: 238
question 5i.19
Can someone explain this question? A reaction mixture that consisted of 0.400 mol H2 and 1.60 mol I2 was introduced into a flask of volume 3.00 L and heated. At equilibrium, 60% of the hydrogen gas had reacted. What is the equilibrium constant K for the reaction H2(g) + I2(g) <=> 2HI(g) at this temp?
- Fri Jan 18, 2019 10:42 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: problem 5I.11
- Replies: 3
- Views: 532
Re: problem 5I.11
A reaction vessel of volume 0.500 L at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0.10 mmol SO3(g). At 700. K, Kc = 1.7 x 10^6 for the equilibrium 2SO2(g) + O2(g) <=> 2SO3(g). a) Calculate the reaction quotient b) will more SO3(g) tend to form?
- Fri Jan 18, 2019 10:34 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Percentage Ionization
- Replies: 4
- Views: 517
Re: Percentage Ionization
So percentage ionization of an acid is the same as percentage deprotonization?
- Thu Jan 17, 2019 1:10 pm
- Forum: Ideal Gases
- Topic: Concentration or Partial Pressure
- Replies: 13
- Views: 1003
Re: Concentration or Partial Pressure
You still calculate them the same way right?
- Thu Jan 17, 2019 1:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Weak Acids and Bases
- Replies: 6
- Views: 573
Re: Weak Acids and Bases
So if it was a strong acid, no you wouldn't add it to pH 7, that's only for very weak acids that don't really affect the pH at all
- Thu Jan 17, 2019 1:05 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: problem 5I.11
- Replies: 3
- Views: 532
problem 5I.11
Can someone explain how to do number 11? I'm not sure if I'm just making calculation errors or if I am doing the problem fundamentally wrong but I can't seem to get the right answer.
Re: churro 31
Yeah he said that ONO is nitrito
- Sat Dec 08, 2018 1:00 pm
- Forum: Conjugate Acids & Bases
- Topic: Strong acids and bases to memorize
- Replies: 9
- Views: 1548
Re: Strong acids and bases to memorize
Some examples of strong bases using from group 1 and group 2 are CaO, Na2O, and Li2O.
- Sat Dec 08, 2018 12:58 pm
- Forum: Conjugate Acids & Bases
- Topic: Water as an Acid/Base
- Replies: 20
- Views: 1568
Re: Water as an Acid/Base
so water is amphoteric and amphiprotic
- Sat Dec 08, 2018 12:55 pm
- Forum: Amphoteric Compounds
- Topic: Polydentate
- Replies: 2
- Views: 251
Re: Polydentate
It doesn't have to have more than 4 bonding sites, it just has to have two or more to be polydentate.
- Sat Dec 08, 2018 12:53 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric
- Replies: 4
- Views: 589
Re: Amphoteric
Can something be an amphoteric compound, acting as an acid and a base, without being amphiprotic? Can it be an acid and base by donating and accepting lone pairs, not protons?
- Sat Dec 08, 2018 12:50 pm
- Forum: Naming
- Topic: Cation Naming
- Replies: 2
- Views: 336
Re: Cation Naming
If it's a coordination compound that overall is neutral, but the complex is negative you still add ate to the end
- Sat Dec 08, 2018 12:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate geometry
- Replies: 2
- Views: 269
Re: Chelate geometry
A chelate is formed by ligands and makes a ring
- Wed Dec 05, 2018 9:23 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Problem 6C.17
- Replies: 1
- Views: 158
Problem 6C.17
For 6C.17, it gives two acids and you have to decide which is stronger. For c-f, how can you tell which is stronger? (The problems are c. HBrO2 vs HClO2, d. HClO4 vs H3PO4, e. HNO3 vs HNO2, f. H2CO3 vs H2GeO3)
- Sun Dec 02, 2018 12:03 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: H+ Acidic and OH- Basic
- Replies: 4
- Views: 622
Re: H+ Acidic and OH- Basic
The Lewis definition is a more general definition, as some compounds can be Lewis bases but not Bronsted bases
- Sun Dec 02, 2018 12:00 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate ligands
- Replies: 3
- Views: 319
Re: Polydentate ligands
You can tell by looking at if there are free lone pairs on the coordination compound
- Sat Dec 01, 2018 11:57 pm
- Forum: Naming
- Topic: endings in naming
- Replies: 3
- Views: 186
endings in naming
How do you know when to change the ends of parts of the name? Like cynaide to cyano or other changes?
- Fri Nov 09, 2018 11:29 am
- Forum: Dipole Moments
- Topic: Induced Dipole
- Replies: 4
- Views: 350
Re: Induced Dipole
You can also get an induced dipole from a non dipole: this is the induced dipole - induced dipole interaction. The way I understand it is because electrons are really always moving around, there are times when some parts of a non-dipole molecules are partially charged in some areas, which can affect...
- Fri Nov 09, 2018 11:25 am
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 9
- Views: 905
Re: Polarizability
Also, what is the difference between polarizing power and polarizability?
- Fri Nov 09, 2018 11:24 am
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 9
- Views: 905
Re: Polarizability
Is its value always negative, or is that just for attractive forces?
- Thu Nov 01, 2018 4:01 pm
- Forum: Lewis Structures
- Topic: Lewis Structure NO3-
- Replies: 3
- Views: 980
Re: Lewis Structure NO3-
The bonds don't just have the electrons added to get an octet, they have all of the electrons, including the valence electrons N already has. It's not limited to 3 to add on to the 5 valence electrons, you have to have the full octet in the bonds including the original 5. With two electrons being sh...
- Thu Nov 01, 2018 3:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: octet rule
- Replies: 11
- Views: 1114
Re: octet rule
Once you get into elements beyond period 3, they can have more than 8 electrons because of the d orbital, allowing for expanded octets
- Thu Nov 01, 2018 3:51 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.5 b and d
- Replies: 1
- Views: 117
2A.5 b and d
In problem 2A, you have to write out the ground state electron configuration of (b)Bi3+ and (d)Tl3+. How do you know that you have to include the f orbital for these? I mostly get electron configurations except for when it gets to the f orbital, and then I'm not sure how it works
- Sun Oct 28, 2018 1:58 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: X,Y,and Z in reference to 3p orbital
- Replies: 5
- Views: 627
Re: X,Y,and Z in reference to 3p orbital
What does the p actually refer to?
- Sun Oct 28, 2018 1:56 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum Numbers n, l, and m
- Replies: 5
- Views: 379
Re: Quantum Numbers n, l, and m
and the fourth quantum number, ms, is either +1/2 or -1/2, and determines whether the electron is spin up or spin down
- Sat Oct 27, 2018 12:10 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 8
- Views: 733
Re: Electron Affinity
It's also basically the same trend as electronegativity.
- Sat Oct 20, 2018 4:41 pm
- Forum: Properties of Light
- Topic: De Broglie's equation [ENDORSED]
- Replies: 7
- Views: 1207
De Broglie's equation [ENDORSED]
Is De Broglie's equation the one that cannot be used for photons because it only applies to things with mass?
- Sat Oct 20, 2018 4:38 pm
- Forum: Properties of Light
- Topic: Planck's constant
- Replies: 5
- Views: 523
Re: Planck's constant
If you ever needed to, you would just need to multiply the hertz by something that has units J x s, which planck's constant has.
- Wed Oct 17, 2018 6:20 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: variable l
- Replies: 2
- Views: 325
variable l
In some of the quantum problems, they list l as a variable, but I can't find what l actually means. (l is lowercase L here) Does anyone know what it means?
- Fri Oct 12, 2018 8:38 pm
- Forum: Photoelectric Effect
- Topic: Work function
- Replies: 7
- Views: 577
Re: Work function
The work function also depends on the metal being tested - different metals have different work functions, or minimum amount of energy needed to remove an electron from the surface.
- Fri Oct 12, 2018 8:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty Principle
- Replies: 5
- Views: 439
Re: Uncertainty Principle
In the uncertainty principle, the units of x are distance (m). What does this actually mean for the position? Is the length just a range of where it could be?
- Fri Oct 12, 2018 8:30 pm
- Forum: Properties of Light
- Topic: Change in E +/-
- Replies: 3
- Views: 215
Change in E +/-
Today in lecture we went through a problem where the change in E was negative because an electron went from a higher energy level to a lower energy level. I understand why that is negative, but then when we went on to find the frequency (using E=hv), we made E positive. I also understand that freque...
- Thu Oct 04, 2018 10:43 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Question G5 part c
- Replies: 1
- Views: 209
Question G5 part c
G5: A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0 mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (c) 50.0 mg of Na2CO3? I unde...
- Thu Oct 04, 2018 10:33 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Question E29 c.
- Replies: 3
- Views: 326
Question E29 c.
For question E29(c):
A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl2 4H20.
(c) How many H20 molecules are present in the sample?
I got the other parts of the question (a,b,d) but now I'm blanking on how to go about this particular part.
A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl2 4H20.
(c) How many H20 molecules are present in the sample?
I got the other parts of the question (a,b,d) but now I'm blanking on how to go about this particular part.
- Wed Oct 03, 2018 11:22 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Question G21 [ENDORSED]
- Replies: 2
- Views: 454
Question G21 [ENDORSED]
I'm not sure what to do for this question: A solution is prepared by dissolving 0.500g of KCl, 0.500 g of K2S, and 0.500 g of K3PO4 in 500mL of water. What is the concentration in the final solution of (a) potassium ions, (b) sulfide ions? I started by converting the grams to moles but I don't know ...