Search found 58 matches

by harshitasarambale4I
Sun Mar 17, 2019 5:58 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U=0
Replies: 6
Views: 146

Re: U=0

When U=0 is w=-q always true?
by harshitasarambale4I
Sun Mar 17, 2019 5:56 pm
Forum: Van't Hoff Equation
Topic: Temp Units
Replies: 11
Views: 197

Re: Temp Units

Pick your R according to the correct units.
by harshitasarambale4I
Mon Mar 11, 2019 9:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Topics
Replies: 8
Views: 133

Re: Final Exam Topics

Professor Lavelle said that questions will come from the Homework and Online Assessments.
by harshitasarambale4I
Mon Mar 11, 2019 9:29 pm
Forum: First Order Reactions
Topic: 15.31 6th Edition
Replies: 3
Views: 37

Re: 15.31 6th Edition

15.31 is not on the syllabus.
by harshitasarambale4I
Mon Mar 11, 2019 9:28 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation energy and k
Replies: 2
Views: 42

Re: Activation energy and k

We can determine this trend by looking at the Arrhenius equation:
ln k = ln A - Ea/RT
by harshitasarambale4I
Sun Mar 03, 2019 9:00 pm
Forum: First Order Reactions
Topic: homework problems
Replies: 2
Views: 33

Re: homework problems

I think we should do homework on the chemical kinetics section.
by harshitasarambale4I
Sun Mar 03, 2019 8:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt(s)
Replies: 10
Views: 130

Re: Pt(s)

Can you use any other metals? I think the textbook might have used Au(s) before.
by harshitasarambale4I
Sun Feb 24, 2019 1:18 pm
Forum: Balancing Redox Reactions
Topic: Oxidation/Reduction
Replies: 2
Views: 36

Re: Oxidation/Reduction

Oxidized species are losing electrons and their charge is becoming more positive.
Reduced species are gaining electrons and their charge is becoming more negative.
by harshitasarambale4I
Sun Feb 24, 2019 1:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum (s)
Replies: 2
Views: 47

Re: Platinum (s)

I was confused about that. In the 6th edition for 14.13, the solutions manual didn't use platinum for the reaction with nickel and zinc but used it in part b for the reaction between I and Ce, and also between H and Cl.
by harshitasarambale4I
Sun Feb 24, 2019 1:15 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 9
Views: 147

Re: Test 2

Basically you need to to do the rest of the homework questions from thermodynamics.
by harshitasarambale4I
Sat Feb 16, 2019 4:42 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Signs for entropy
Replies: 5
Views: 92

Re: Signs for entropy

How would you determine the signs for enthalpy?
by harshitasarambale4I
Sat Feb 16, 2019 4:40 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 4
Views: 77

Re: Reversible vs Irreversible

Also remember that irreversible processes have more entropy than reversible processes.
by harshitasarambale4I
Sat Feb 16, 2019 4:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: When does delta U equal zero?
Replies: 17
Views: 277

Re: When does delta U equal zero?

I'm not sure if we can equate isothermal to equilibrium.
by harshitasarambale4I
Sun Feb 10, 2019 11:39 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.39 6th edition
Replies: 2
Views: 49

Re: 11.39 6th edition

In the table, use the K values in the second column for this question.
by harshitasarambale4I
Sun Feb 10, 2019 11:35 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S equations
Replies: 3
Views: 64

Re: Delta S equations

One of the equations we need to know is...
delta S = -delta H/T
by harshitasarambale4I
Sun Feb 10, 2019 11:32 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: adding an inert gas
Replies: 4
Views: 150

Re: adding an inert gas

Inert gasses/noble gasses are nonreactive.
by harshitasarambale4I
Sun Feb 03, 2019 2:53 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Gas vs solid
Replies: 5
Views: 76

Re: Gas vs solid

Is this why delta U = delta H in biological systems since reactions in biological systems take place in liquids?
by harshitasarambale4I
Sun Feb 03, 2019 2:52 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Clarification on Gibbs
Replies: 2
Views: 64

Re: Clarification on Gibbs

H represents the enthalpy of a system.
by harshitasarambale4I
Sun Feb 03, 2019 2:49 pm
Forum: Calculating Work of Expansion
Topic: What is Work?
Replies: 5
Views: 76

Re: What is Work?

Work is the energy change in a system due to an outside force.
by harshitasarambale4I
Sat Jan 26, 2019 10:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box Ratios
Replies: 8
Views: 188

Re: ICE Box Ratios

-X is usually found in the "C" or the "change" row of the ICE table. It is not used when calculating K.
by harshitasarambale4I
Sat Jan 26, 2019 10:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Molar Entropy
Replies: 3
Views: 58

Re: Molar Entropy

Generally, more complex molecules have higher molar entropy. Also, molar entropy is proportional to the heat required to raise a substance to a certain temperature.
--> Entropy = heat required/final temperature
by harshitasarambale4I
Sat Jan 26, 2019 10:36 pm
Forum: Phase Changes & Related Calculations
Topic: Due date for Discussion Questions
Replies: 8
Views: 126

Re: Due date for Discussion Questions

Does anyone know if there is a specific time on Sunday?
by harshitasarambale4I
Mon Jan 21, 2019 3:59 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH of weak acid and its salt
Replies: 2
Views: 59

Re: pH of weak acid and its salt

I believe it is not included when calculating K because it is a solid but I'm not sure as to why it isn't in the equation.
by harshitasarambale4I
Mon Jan 21, 2019 3:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Net ionic equation
Replies: 2
Views: 32

Re: Net ionic equation

I think for net ionic equations, you would just disregard the ions that are on both sides of the equation and calculate the equilibrium constant accordingly.
by harshitasarambale4I
Mon Jan 21, 2019 3:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percentage Protonation
Replies: 2
Views: 26

Re: Percentage Protonation

It will be the equilibrium value divided by the initial value.
by harshitasarambale4I
Sat Jan 12, 2019 10:56 pm
Forum: Ideal Gases
Topic: Concentration or Partial Pressure
Replies: 13
Views: 170

Re: Concentration or Partial Pressure

Yes, the question should specify. However, it is important to remember that if you are given moles of gas, you have to convert it to units of pressure using the PV=nRT equation.
by harshitasarambale4I
Sat Jan 12, 2019 10:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.3 example from book
Replies: 3
Views: 52

Re: 5G.3 example from book

I believe the net ionic equation is used to calculate K because spectator ions are not included when calculating K.
by harshitasarambale4I
Sat Jan 12, 2019 10:48 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pressure and temperature
Replies: 4
Views: 31

Re: pressure and temperature

Yes temperature changes the K value. In class we said that endothermic reactions will favor product formation when heating while exothermic reactions will favor reactant formation when heating.
by harshitasarambale4I
Sat Dec 08, 2018 12:58 am
Forum: Lewis Acids & Bases
Topic: H-
Replies: 3
Views: 55

H-

Is H- a Lewis acid or base? What would be the proton transfer equation for that.
by harshitasarambale4I
Tue Dec 04, 2018 11:52 am
Forum: Biological Examples
Topic: CH 17 6TH EDITION HW 17.31d
Replies: 4
Views: 78

Re: CH 17 6TH EDITION HW 17.31d

Sodium is the cation and the coordinate compound is the anion. Therefore, you would leave sodium outside of the brackets.
by harshitasarambale4I
Tue Dec 04, 2018 11:46 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: 12.127 amphiprotic behavior
Replies: 1
Views: 57

12.127 amphiprotic behavior

How would you do part c of this question? The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid t...
by harshitasarambale4I
Tue Dec 04, 2018 11:35 am
Forum: Lewis Acids & Bases
Topic: KBr
Replies: 5
Views: 101

Re: KBr

Since bromine is bigger than fluorine, the bond length is going to be longer and weaker. This means it will be a stronger acid.
by harshitasarambale4I
Sun Nov 25, 2018 12:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming
Replies: 4
Views: 81

Re: Naming

It also helps to look at the VSEPR formulas when determining shape name. For example, AX2E is generally always bent.
by harshitasarambale4I
Sun Nov 25, 2018 12:51 pm
Forum: Octet Exceptions
Topic: Exceptions
Replies: 3
Views: 163

Re: Exceptions

Hydrogen and helium are also exceptions to the octet rule.
by harshitasarambale4I
Sun Nov 25, 2018 12:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes Not covered in Lecture
Replies: 10
Views: 149

Re: Shapes Not covered in Lecture

I believe T-shaped does come up in the homework problems.
by harshitasarambale4I
Sun Nov 18, 2018 9:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 5
Views: 67

Re: Lone pairs

When determining the molecular shape, we consider the influence of the lone pairs on the shape, but when naming we only look at the positions of atoms. For example, in NF3, the atoms and lone pair would form a tetrahedral shape. But since we don't consider the lone pair on the N while naming, the sh...
by harshitasarambale4I
Sun Nov 18, 2018 9:40 pm
Forum: Hybridization
Topic: Hybridization 4.95
Replies: 1
Views: 113

Re: Hybridization 4.95

The lone pair will occupy the 2sp^2 hybrid orbital. Sigma bonds will compose the hybrid orbitals while pi bonds will compose the non-hybrid orbitals.
by harshitasarambale4I
Sun Nov 18, 2018 9:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance Structures and bond angles
Replies: 4
Views: 147

Re: Resonance Structures and bond angles

No they do not. The bond angles would resonate similar to the bond and bond lengths.
by harshitasarambale4I
Sun Nov 11, 2018 5:43 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi Bonds
Replies: 3
Views: 75

Re: Sigma vs. Pi Bonds

According to the textbook, a sigma bond "is cylindrically symmetrical (the same in all directions around the long axis of the bond), with no nodal planes containing the internuclear axis" whereas a pi bond is "a bond in which the two electrons lie in two lobes, one on each side of the...
by harshitasarambale4I
Sun Nov 11, 2018 5:34 pm
Forum: Bond Lengths & Energies
Topic: 3.117
Replies: 1
Views: 34

Re: 3.117

If you draw out the resonance structures, you will notice that there are single AND double bonds. This means that these bonds have some double bond character. For part c, calculate the formal charges of your two isomers and the one with the least charge is the more favored one.
by harshitasarambale4I
Sun Nov 11, 2018 5:30 pm
Forum: Bond Lengths & Energies
Topic: 3.119 6th ed
Replies: 2
Views: 55

Re: 3.119 6th ed

Technically, there is only one bond length. This happens because we can make a resonance structure for this molecule. Basically, resonance relates to delocalization of electron which implies that bond length is an average of the two resonance structures (average of the double and single bonds).
by harshitasarambale4I
Sat Nov 03, 2018 9:03 pm
Forum: Lewis Structures
Topic: HW 6th Edition 3.57
Replies: 1
Views: 22

Re: HW 6th Edition 3.57

Since hydrogen sulfite is an oxoacid, the hydrogen generally bonds to one of the oxygen atoms.
by harshitasarambale4I
Sat Nov 03, 2018 8:45 pm
Forum: Lewis Structures
Topic: Cations and Anions
Replies: 3
Views: 53

Re: Cations and Anions

A cation is a positively charged ion and an anion is a negatively charged ion.
by harshitasarambale4I
Sat Nov 03, 2018 8:43 pm
Forum: Octet Exceptions
Topic: Which atom gets extra lone pair
Replies: 2
Views: 50

Re: Which atom gets extra lone pair

You have to look at the formal charges. Generally we try to keep the central atom at a zero FC and the outer atoms can have negative charge if necessary.
by harshitasarambale4I
Sat Oct 27, 2018 8:50 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 4
Views: 96

Re: Electron Configuration

Also, the number before the s, p, d, or f is the n value.

For example, in 4s. n = 4 and l = 0.
by harshitasarambale4I
Sat Oct 27, 2018 8:45 pm
Forum: Lewis Structures
Topic: Polyatomic Ions
Replies: 3
Views: 35

Re: Polyatomic Ions

Unless we cover how to find them in class, I think they will likely give us the charges.
by harshitasarambale4I
Sat Oct 27, 2018 8:43 pm
Forum: Lewis Structures
Topic: Periodic Table Trends
Replies: 3
Views: 34

Re: Periodic Table Trends

According to the textbook, electron affinity is the "energy released when an electron is added to a gas-phase atom" whereas electronegativity is defined as the "electron-pulling power of an atom when it is part of a molecule." I don't think they would be interchangeable because o...
by harshitasarambale4I
Sun Oct 21, 2018 12:52 am
Forum: DeBroglie Equation
Topic: de broglie post module q 35 [ENDORSED]
Replies: 2
Views: 59

Re: de broglie post module q 35 [ENDORSED]

I think this question is asking you to relate cars to the particle properties of light rather than the wave properties of light. You would still solve the question normally.
by harshitasarambale4I
Sun Oct 21, 2018 12:47 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals on the test
Replies: 6
Views: 142

Re: Orbitals on the test

I believe that everything that was covered up till this Friday's lecture is going to be on the test. So basically we need to know the 4 quantum numbers and which combination of quantum numbers is valid. I would look at the diagram with boxes that visualize the shells and subshells. I would also know...
by harshitasarambale4I
Sun Oct 21, 2018 12:40 am
Forum: Einstein Equation
Topic: Joules per photon?
Replies: 5
Views: 208

Joules per photon?

When we use the equation E=hv, are we supposed to leave our answer in Joules per photon or simply just Joules?
by harshitasarambale4I
Sun Oct 14, 2018 3:58 pm
Forum: Significant Figures
Topic: Empirical and Molecular Formula's Video #19
Replies: 3
Views: 244

Re: Empirical and Molecular Formula's Video #19

I don't believe that since 84 is an integer, you disregard it when considering sig figs. You always have to look at the number with the lowest number of sig figs when rounding your answer, whether it is an integer or not.
by harshitasarambale4I
Sun Oct 14, 2018 3:54 pm
Forum: Photoelectric Effect
Topic: Electrons Lost
Replies: 3
Views: 79

Re: Electrons Lost

It is also important to remember that the metal is in a circuit. This means that the electrons in the metal will be continuously replenished, ensuring that the metal never runs out of electrons.
by harshitasarambale4I
Sun Oct 14, 2018 3:49 pm
Forum: Photoelectric Effect
Topic: Purpose of the Photoelectric Effect
Replies: 4
Views: 51

Re: Purpose of the Photoelectric Effect

The photoelectric effect is important because it helps explain the duality of light. It proves that light not only acts as a wave but also as a photon. It also helps explain certain behaviors of light that were unclear when assuming light was only a wave.
by harshitasarambale4I
Sat Oct 06, 2018 5:34 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Naming Compounds
Replies: 3
Views: 50

Re: Naming Compounds

Magnesium sulfate heptahydrate, is actually MgSO 4 .7H 2 O The raised dot separates the water of hydration. This compound contains a hydrate so in this form, magnesium sulfate heptahydrate exists as a crystal. But when this compound is heated, the water of hydration is lost and the crystals are lost...
by harshitasarambale4I
Sat Oct 06, 2018 4:57 pm
Forum: Properties of Light
Topic: Question 2.1
Replies: 1
Views: 114

Question 2.1

When an electron in a hydrogen atom transitions from 1s to 1p which of the following happens?
I know that energy, n, and the radius increases. Can someone explain why the value of l increases
by harshitasarambale4I
Sat Oct 06, 2018 4:51 pm
Forum: Properties of Light
Topic: Chapter 1 Question 1.3
Replies: 3
Views: 63

Re: Chapter 1 Question 1.3

Change in electric field correlates to energy. Using the equation, E=hv, if frequency (v) decreases, then energy will also decrease proportionally.

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