Search found 59 matches

by Athena L 1B
Thu Mar 14, 2019 12:00 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Bimolecular
Replies: 13
Views: 90

Re: Bimolecular

So is a bimolecular reaction another way of saying it's second order?
by Athena L 1B
Thu Mar 14, 2019 11:58 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation Energy
Replies: 7
Views: 45

Re: Activation Energy

The hill - looking thing that comes after the reactants in energy diagrams represents the activation energy
by Athena L 1B
Thu Mar 14, 2019 11:57 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Y-Axis Units
Replies: 2
Views: 24

Re: Y-Axis Units

Also, the units for k are specific to each reaction, so you have to find those separately too
by Athena L 1B
Thu Mar 14, 2019 11:52 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics Plots
Replies: 5
Views: 27

Re: Kinetics Plots

If you plot any of those graphs but get a curve, you know you have the wrong order reaction
by Athena L 1B
Thu Mar 14, 2019 11:51 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetically v. Thermodynamically Controlled Reaction
Replies: 2
Views: 23

Re: Kinetically v. Thermodynamically Controlled Reaction

can that tell you anything about the rate of the reaction?
by Athena L 1B
Thu Feb 28, 2019 5:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cathode vs anode
Replies: 4
Views: 48

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?
by Athena L 1B
Thu Feb 28, 2019 4:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Pt inert electrode
Replies: 9
Views: 79

Re: Pt inert electrode

Is Pt(s) the only other substance you would add in any scenario?
by Athena L 1B
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: 41

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?
by Athena L 1B
Thu Feb 28, 2019 4:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Electrochemical Series
Replies: 2
Views: 30

Re: Electrochemical Series

I think it is a series of elements arranged in order of their reduction potentials
by Athena L 1B
Thu Feb 28, 2019 4:35 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.9 ch 14
Replies: 3
Views: 28

Re: 14.9 ch 14

Can you post the question?
by Athena L 1B
Thu Feb 28, 2019 4:35 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: E
Replies: 4
Views: 46

Re: E

I think it is different because it's specifically the E of the cathode and anode
by Athena L 1B
Thu Feb 28, 2019 4:33 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: "Strongly oxidizing"
Replies: 5
Views: 52

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.
by Athena L 1B
Thu Feb 14, 2019 4:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal energy (U) of an isolated system
Replies: 17
Views: 143

Re: Internal energy (U) of an isolated system

Closed systems can transfer only energy, and open systems can transfer energy and matter
by Athena L 1B
Thu Feb 14, 2019 4:26 pm
Forum: Student Social/Study Group
Topic: week 6 homework
Replies: 2
Views: 65

week 6 homework

What sections is the homework for this week supposed to be on?
by Athena L 1B
Thu Feb 14, 2019 4:22 pm
Forum: Student Social/Study Group
Topic: last problem on midterm
Replies: 4
Views: 171

Re: last problem on midterm

What was the problem for this one?
by Athena L 1B
Thu Feb 07, 2019 1:42 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: standard temperature
Replies: 1
Views: 21

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?
by Athena L 1B
Thu Feb 07, 2019 1:36 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: problem 4D.3
Replies: 1
Views: 24

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...
by Athena L 1B
Sat Feb 02, 2019 12:47 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Homework sections
Replies: 2
Views: 33

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?
by Athena L 1B
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: 36

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
by Athena L 1B
Sat Feb 02, 2019 12:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Friday Lecture Notes
Replies: 2
Views: 33

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.
by Athena L 1B
Sat Feb 02, 2019 12:39 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Forms of U Equations
Replies: 3
Views: 49

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?
by Athena L 1B
Sat Feb 02, 2019 12:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Reaction Enthalpy
Replies: 3
Views: 30

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.
by Athena L 1B
Sat Feb 02, 2019 12:32 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U vs Delta H
Replies: 6
Views: 56

Re: Delta U vs Delta H

Delta Hf can be found by dividing delta H by the number of moles
by Athena L 1B
Sat Feb 02, 2019 12:29 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy vs Internal energy
Replies: 5
Views: 42

Re: Enthalpy vs Internal energy

I don't think there is a difference, I think the SI units for both are in joules
by Athena L 1B
Thu Jan 24, 2019 10:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: question 5i.19
Replies: 3
Views: 35

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?
by Athena L 1B
Fri Jan 18, 2019 10:42 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: problem 5I.11
Replies: 3
Views: 44

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?
by Athena L 1B
Fri Jan 18, 2019 10:34 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Percentage Ionization
Replies: 4
Views: 59

Re: Percentage Ionization

So percentage ionization of an acid is the same as percentage deprotonization?
by Athena L 1B
Thu Jan 17, 2019 1:10 pm
Forum: Ideal Gases
Topic: Concentration or Partial Pressure
Replies: 13
Views: 119

Re: Concentration or Partial Pressure

You still calculate them the same way right?
by Athena L 1B
Thu Jan 17, 2019 1:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Weak Acids and Bases
Replies: 6
Views: 119

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
by Athena L 1B
Thu Jan 17, 2019 1:05 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: problem 5I.11
Replies: 3
Views: 44

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.
by Athena L 1B
Sat Dec 08, 2018 1:03 pm
Forum: Naming
Topic: churro 31
Replies: 4
Views: 58

Re: churro 31

Yeah he said that ONO is nitrito
by Athena L 1B
Sat Dec 08, 2018 1:00 pm
Forum: Conjugate Acids & Bases
Topic: Strong acids and bases to memorize
Replies: 9
Views: 123

Re: Strong acids and bases to memorize

Some examples of strong bases using from group 1 and group 2 are CaO, Na2O, and Li2O.
by Athena L 1B
Sat Dec 08, 2018 12:58 pm
Forum: Conjugate Acids & Bases
Topic: Water as an Acid/Base
Replies: 8
Views: 50

Re: Water as an Acid/Base

so water is amphoteric and amphiprotic
by Athena L 1B
Sat Dec 08, 2018 12:55 pm
Forum: Amphoteric Compounds
Topic: Polydentate
Replies: 2
Views: 25

Re: Polydentate

It doesn't have to have more than 4 bonding sites, it just has to have two or more to be polydentate.
by Athena L 1B
Sat Dec 08, 2018 12:53 pm
Forum: Amphoteric Compounds
Topic: Amphoteric
Replies: 4
Views: 54

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?
by Athena L 1B
Sat Dec 08, 2018 12:50 pm
Forum: Naming
Topic: Cation Naming
Replies: 2
Views: 34

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
by Athena L 1B
Sat Dec 08, 2018 12:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate geometry
Replies: 2
Views: 35

Re: Chelate geometry

A chelate is formed by ligands and makes a ring
by Athena L 1B
Wed Dec 05, 2018 9:23 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Problem 6C.17
Replies: 1
Views: 33

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)
by Athena L 1B
Sun Dec 02, 2018 12:03 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: H+ Acidic and OH- Basic
Replies: 4
Views: 155

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
by Athena L 1B
Sun Dec 02, 2018 12:00 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate ligands
Replies: 3
Views: 39

Re: Polydentate ligands

You can tell by looking at if there are free lone pairs on the coordination compound
by Athena L 1B
Sat Dec 01, 2018 11:57 pm
Forum: Naming
Topic: endings in naming
Replies: 3
Views: 35

endings in naming

How do you know when to change the ends of parts of the name? Like cynaide to cyano or other changes?
by Athena L 1B
Fri Nov 09, 2018 11:29 am
Forum: Dipole Moments
Topic: Induced Dipole
Replies: 4
Views: 54

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...
by Athena L 1B
Fri Nov 09, 2018 11:25 am
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 9
Views: 102

Re: Polarizability

Also, what is the difference between polarizing power and polarizability?
by Athena L 1B
Fri Nov 09, 2018 11:24 am
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 9
Views: 102

Re: Polarizability

Is its value always negative, or is that just for attractive forces?
by Athena L 1B
Thu Nov 01, 2018 4:01 pm
Forum: Lewis Structures
Topic: Lewis Structure NO3-
Replies: 3
Views: 35

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...
by Athena L 1B
Thu Nov 01, 2018 3:53 pm
Forum: Ionic & Covalent Bonds
Topic: octet rule
Replies: 11
Views: 145

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
by Athena L 1B
Thu Nov 01, 2018 3:51 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.5 b and d
Replies: 1
Views: 24

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
by Athena L 1B
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: 98

Re: X,Y,and Z in reference to 3p orbital

What does the p actually refer to?
by Athena L 1B
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: 104

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
by Athena L 1B
Sat Oct 27, 2018 12:10 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 8
Views: 94

Re: Electron Affinity

It's also basically the same trend as electronegativity.
by Athena L 1B
Sat Oct 20, 2018 4:41 pm
Forum: Properties of Light
Topic: De Broglie's equation
Replies: 6
Views: 96

De Broglie's equation

Is De Broglie's equation the one that cannot be used for photons because it only applies to things with mass?
by Athena L 1B
Sat Oct 20, 2018 4:38 pm
Forum: Properties of Light
Topic: Planck's constant
Replies: 5
Views: 76

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.
by Athena L 1B
Wed Oct 17, 2018 6:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: variable l
Replies: 2
Views: 31

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?
by Athena L 1B
Fri Oct 12, 2018 8:38 pm
Forum: Photoelectric Effect
Topic: Work function
Replies: 7
Views: 101

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.
by Athena L 1B
Fri Oct 12, 2018 8:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Principle
Replies: 5
Views: 89

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?
by Athena L 1B
Fri Oct 12, 2018 8:30 pm
Forum: Properties of Light
Topic: Change in E +/-
Replies: 3
Views: 21

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...
by Athena L 1B
Thu Oct 04, 2018 10:43 am
Forum: Molarity, Solutions, Dilutions
Topic: Question G5 part c
Replies: 1
Views: 41

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...
by Athena L 1B
Thu Oct 04, 2018 10:33 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question E29 c.
Replies: 3
Views: 44

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.
by Athena L 1B
Wed Oct 03, 2018 11:22 am
Forum: Molarity, Solutions, Dilutions
Topic: Question G21 [ENDORSED]
Replies: 2
Views: 85

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 ...

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