Search found 60 matches

by Pritish Patil 1K
Thu Mar 14, 2019 1:00 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 4
Views: 113

Re: Test 2

Rusting is spontaneous because it happens naturally over a long period of time.
by Pritish Patil 1K
Thu Mar 14, 2019 12:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Largest E°cell question test #2
Replies: 4
Views: 120

Re: Largest E°cell question test #2

One would choose the largest reducing agent and the largest oxidizing agent.
by Pritish Patil 1K
Thu Mar 14, 2019 12:58 pm
Forum: Balancing Redox Reactions
Topic: balancing water
Replies: 8
Views: 170

Re: balancing water

One can cancel out the waters or simply add the proper amount in the beginning.
by Pritish Patil 1K
Thu Mar 14, 2019 12:57 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 14
Views: 179

Re: Nernst

Yes, it must be for a balanced redox reaction.
by Pritish Patil 1K
Thu Mar 14, 2019 12:55 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal energy (U) of an isolated system
Replies: 17
Views: 454

Re: Internal energy (U) of an isolated system

The amount of energy would be the same as it is an isolated system.
by Pritish Patil 1K
Thu Mar 14, 2019 12:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Adiabatic and isothermal
Replies: 6
Views: 410

Re: Adiabatic and isothermal

Adiabatic= no heat transfer (q=0)
Isothermal= no change in temperature (deltaT=0)
by Pritish Patil 1K
Thu Mar 14, 2019 12:53 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: difference in states
Replies: 6
Views: 244

Re: difference in states

Yes, different types of systems affect temperature and volume.
by Pritish Patil 1K
Thu Mar 14, 2019 12:51 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Expansion of a system
Replies: 7
Views: 293

Re: Expansion of a system

You can tell when work is being done and the volume of the system is changing.
by Pritish Patil 1K
Thu Mar 14, 2019 12:50 pm
Forum: Calculating Work of Expansion
Topic: Work without change in volume
Replies: 8
Views: 310

Re: Work without change in volume

There is no work done as there is no change in volume.
by Pritish Patil 1K
Tue Mar 12, 2019 1:34 pm
Forum: Calculating Work of Expansion
Topic: Work
Replies: 8
Views: 290

Re: Work

There are charts on the internet that simplify which equation to use for a certain situation (ex: isobaric, isothermal, etc). Hope this helped!
by Pritish Patil 1K
Tue Mar 12, 2019 1:32 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Difference in Answers?
Replies: 2
Views: 61

Re: Difference in Answers?

There will be a slight difference but nothing significant enough to warrant taking points off if work is done correctly.
by Pritish Patil 1K
Tue Mar 12, 2019 1:31 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Determining Spontaneity
Replies: 7
Views: 345

Re: Determining Spontaneity

Because if delta S is small enough (negative enough = large negative number), then even if the reaction was slightly exothermic (delta H < 0), then delta G could be greater than 0, making it nonspontaneous.
by Pritish Patil 1K
Tue Mar 12, 2019 1:28 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous Reaction
Replies: 5
Views: 243

Re: Spontaneous Reaction

I'm not completely sure. But I assumed that because it is precipitation, the water is going from liquid to solid state. Because the freezing point of liquid water was 0 degrees C, I assumed that the precipitation would be spontaneous as the surrounding temperature was -10 degrees C, which is less th...
by Pritish Patil 1K
Tue Mar 12, 2019 1:24 pm
Forum: Phase Changes & Related Calculations
Topic: Negative and Positive values of delta H and w
Replies: 6
Views: 271

Re: Negative and Positive values of delta H and w

Work greater than 0 means work is done on the system; work less than 0 means that work is done on the surroundings. deltaH greater than 0 means heat is flowing in the system and deltaH less than 0 means that heat is flowing out of the system (assuming constant pressure).
by Pritish Patil 1K
Tue Mar 12, 2019 1:22 pm
Forum: Phase Changes & Related Calculations
Topic: rotational v vibrational energy
Replies: 5
Views: 268

Re: rotational v vibrational energy

Rotational energy is around an axis while vibrational is simply moving back and forth on one axis.
by Pritish Patil 1K
Tue Mar 12, 2019 1:20 pm
Forum: Phase Changes & Related Calculations
Topic: ΔH vs ΔU?
Replies: 8
Views: 353

Re: ΔH vs ΔU?

When volume is constant, work = 0 J. This means that deltaU = q.
by Pritish Patil 1K
Tue Mar 12, 2019 1:19 pm
Forum: Phase Changes & Related Calculations
Topic: 4.18J or 0.38J
Replies: 8
Views: 310

Re: 4.18J or 0.38J

4.18J is the specific heat capacity of water while 0.38J is the specific heat capacity of copper.
by Pritish Patil 1K
Tue Mar 12, 2019 1:18 pm
Forum: Phase Changes & Related Calculations
Topic: joules conversion factor
Replies: 7
Views: 296

Re: joules conversion factor

It is given on the constants and equations sheet on all of our exams and tests.
by Pritish Patil 1K
Tue Mar 12, 2019 1:17 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Changes
Replies: 11
Views: 390

Re: Phase Changes

Yes, it is significant as many thermochemistry questions are based on this graph (ex: amt of energy needed from temp1 phase 1 to temp 2 phase 2). It is important to know this.
by Pritish Patil 1K
Tue Mar 12, 2019 1:15 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs Boiling Water
Replies: 8
Views: 303

Re: Steam vs Boiling Water

Steam has more heat energy (q), causing a worse burn. This is because it takes a certain amount of energy to execute the phase change from boiling water to steam, in which the temperature of the substance does not change, only heat energy q.
by Pritish Patil 1K
Tue Mar 12, 2019 1:12 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Edition 7 #5.61
Replies: 2
Views: 76

Re: Edition 7 #5.61

Only liquids and solids are not included in the equilibrium expression. Aqueous and gas phase molecules are included.
by Pritish Patil 1K
Tue Mar 12, 2019 1:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: ICE
Replies: 19
Views: 311

Re: ICE

E stands for the equilibrium concentration of the reactants and products.
by Pritish Patil 1K
Tue Mar 12, 2019 1:10 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75156

Re: Reading the textbook [ENDORSED]

I read the textbook to understand the content in relation to the homework problems. However, if I don't understand something I go and watch a youtube video or something similar to help me understand.
by Pritish Patil 1K
Tue Mar 12, 2019 1:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increasing/Decreasing temp
Replies: 8
Views: 279

Re: Increasing/Decreasing temp

If a reaction is endothermic, then increasing the temperature will shift the reaction to the right and decreasing the temperature will shift the reaction to the left. If a reaction is exothermic, then decreasing the temperature will shift the reaction to the right and increasing the temperature will...
by Pritish Patil 1K
Tue Mar 12, 2019 1:04 pm
Forum: Ideal Gases
Topic: 5% rule
Replies: 12
Views: 291

Re: 5% rule

If the change based on the approximation is less than 5% then an approximation can be made. Normally, this works for k values that are less than 10^-3.
by Pritish Patil 1K
Tue Mar 12, 2019 1:01 pm
Forum: Ideal Gases
Topic: How do I know what is an Ideal Gas
Replies: 11
Views: 187

Re: How do I know what is an Ideal Gas

Most of the questions we will receive assume that the gas is an ideal gas. It will explicitly tell us.
by Pritish Patil 1K
Tue Mar 12, 2019 1:00 pm
Forum: Ideal Gases
Topic: units
Replies: 15
Views: 369

Re: units

K does not have units, which is why points were probably taken off for writing bar after k. The units should cancel each other out as well.
by Pritish Patil 1K
Tue Mar 12, 2019 12:58 pm
Forum: Ideal Gases
Topic: Approximations for ICE
Replies: 20
Views: 248

Re: Approximations for ICE

When the k value is less than 10^-3
by Pritish Patil 1K
Tue Mar 12, 2019 12:57 pm
Forum: Ideal Gases
Topic: Q and K
Replies: 13
Views: 230

Re: Q and K

Q is the concentrations of the products over the reactants when the equation is not at equilibrium; K is the concentration of the products over the reactants when the equation is at equilibrium.
by Pritish Patil 1K
Fri Dec 07, 2018 11:15 am
Forum: Conjugate Acids & Bases
Topic: Neutralization Reactions
Replies: 6
Views: 314

Re: Neutralization Reactions

Use water as another product and fill in the reactants.
by Pritish Patil 1K
Fri Dec 07, 2018 11:13 am
Forum: Naming
Topic: Final Exam
Replies: 9
Views: 206

Re: Final Exam

I would memorize for the final exam.
by Pritish Patil 1K
Fri Dec 07, 2018 11:12 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Total Charge
Replies: 5
Views: 147

Re: Total Charge

Add up the charges of the ligands and the transition metal.
by Pritish Patil 1K
Fri Dec 07, 2018 11:10 am
Forum: Lewis Acids & Bases
Topic: HCl vs. HI
Replies: 7
Views: 129

Re: HCl vs. HI

Whichever atom has a higher atomic radius means that there will be a longer bond, therefore a stronger acid because more H+ can disassociate easier.
by Pritish Patil 1K
Fri Dec 07, 2018 11:08 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strongs Acids
Replies: 4
Views: 267

Re: Strongs Acids

The seven main ones you should memorize for the exam are:
HS04
HNO3
HClO4
HClO3
HBr
HI
HCl
by Pritish Patil 1K
Fri Dec 07, 2018 11:06 am
Forum: Lewis Acids & Bases
Topic: Ligands
Replies: 7
Views: 272

Re: Ligands

A neutral ligand has no effect on charge because it is neutral.
by Pritish Patil 1K
Sun Nov 25, 2018 10:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming
Replies: 5
Views: 86

Re: Naming

Yes, they will be the same!
by Pritish Patil 1K
Sun Nov 25, 2018 10:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming the Shape
Replies: 16
Views: 252

Re: Naming the Shape

I don't think we are required to draw the VSEPR model.
by Pritish Patil 1K
Sun Nov 25, 2018 10:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 753

Re: Test 3

It says on the website to know the End of Bonding 6th(3.12), 7th(2D) and all of Molecular Shape and Structure.
by Pritish Patil 1K
Sun Nov 18, 2018 11:54 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 9
Views: 217

Re: Bond Length

I believe it would be the average of the two lengths.
by Pritish Patil 1K
Sun Nov 18, 2018 11:52 pm
Forum: Dipole Moments
Topic: Test
Replies: 15
Views: 266

Re: Test

The test will be given in Week 9 discussions.
by Pritish Patil 1K
Sun Nov 11, 2018 8:38 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 9
Views: 274

Re: Bond Length

The trend follows that triple are are the shortest while single are the longest.
by Pritish Patil 1K
Sun Nov 11, 2018 8:34 pm
Forum: Dipole Moments
Topic: Dipole Moments [ENDORSED]
Replies: 10
Views: 232

Re: Dipole Moments [ENDORSED]

We don't have to calculate them.
by Pritish Patil 1K
Sun Nov 11, 2018 8:33 pm
Forum: Dipole Moments
Topic: Dipole
Replies: 8
Views: 211

Re: Dipole

I'm pretty sure dipole moments are only relevant in VSPER and not Lewis structures.
by Pritish Patil 1K
Sun Nov 04, 2018 3:52 pm
Forum: Octet Exceptions
Topic: The center atom
Replies: 20
Views: 619

Re: The center atom

The central atom would have the lowest ionization energy, which in this case is Oxygen.
by Pritish Patil 1K
Sun Nov 04, 2018 3:50 pm
Forum: Ionic & Covalent Bonds
Topic: determining bond strength
Replies: 3
Views: 111

Re: determining bond strength

Compare the difference of electronegativity between the two atoms to determine what type and how strong the bond is.
by Pritish Patil 1K
Sun Nov 04, 2018 3:47 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 4
Views: 103

Re: Drawing Lewis Structures

Draw the all the resonance structures with a double-headed arrow in between.
by Pritish Patil 1K
Sun Oct 28, 2018 7:45 pm
Forum: Ionic & Covalent Bonds
Topic: Bond
Replies: 9
Views: 204

Re: Bond

They are rare and we do not need to worry about it for this course.
by Pritish Patil 1K
Sun Oct 28, 2018 7:44 pm
Forum: Ionic & Covalent Bonds
Topic: the Octet rule
Replies: 21
Views: 420

Re: the Octet rule

Elements usually abide by the octet rule or want a half octet.
by Pritish Patil 1K
Sun Oct 28, 2018 7:42 pm
Forum: Ionic & Covalent Bonds
Topic: bound atoms
Replies: 8
Views: 168

Re: bound atoms

There is a release of energy when atoms bind together, resulting in less energy than single atoms.
by Pritish Patil 1K
Sun Oct 21, 2018 10:45 pm
Forum: *Black Body Radiation
Topic: Question 1.21
Replies: 5
Views: 479

Re: Question 1.21

The correct answer is the photoelectric effect because it best supports the idea that electromagnetic radiation is like particles. This is because in the photoelectric effect the radiation consists of packets of energy (photons) with a fixed energy based on a multiple of h(planck's constant).
by Pritish Patil 1K
Sun Oct 21, 2018 10:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Q 42 on post assessment
Replies: 5
Views: 98

Re: Q 42 on post assessment

Use the equation for the energy level of an H-atom. (1/lambda=R((1/n^2 (initial)-(1/n^2(final))). Since we have the frequency, the lambda can be calculated. As well plug in n=4 for the final energy level and solve for the initial energy level.
by Pritish Patil 1K
Sun Oct 21, 2018 10:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 2
Views: 66

Re: Orbitals

Because the electrons that are in the orbitals closer to the nucleus block the outer electrons, there is less "pull" toward the nucleus for the outer electrons and slight repulsion from inner electrons.
by Pritish Patil 1K
Sun Oct 14, 2018 10:52 pm
Forum: Einstein Equation
Topic: Symbol for frequency
Replies: 12
Views: 246

Re: Symbol for frequency

I have not seen Dr. Lavelle introduce "f" yet so I would just stick with "v" (nu).
by Pritish Patil 1K
Sun Oct 14, 2018 10:48 pm
Forum: Properties of Electrons
Topic: Midterm #2 question 4a,b
Replies: 5
Views: 294

Re: Midterm #2 question 4a,b

The question is essentially asking if the wavelength of the ejected electron is too small to be detected. I'm pretty sure this means is it smaller than 10^-18 power.
by Pritish Patil 1K
Sun Oct 14, 2018 10:43 pm
Forum: Properties of Light
Topic: Problem A9
Replies: 5
Views: 91

Re: Problem A9

The trick is to first convert 2.5nm to 2.5x10^-9 meters (SI unit). Then plug into the rearranged equation of v=c/lambda to solve for the frequency.
by Pritish Patil 1K
Sat Oct 06, 2018 6:21 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 8
Views: 220

Re: Limiting Reactant

Instead of calculating both theoretical yields, one can use the mole ratios in the balanced chemical equation to determine which substance is the limiting reactant. Of course this may only be completed after the amount in moles for the substances are converted from grams or otherwise determined.
by Pritish Patil 1K
Sat Oct 06, 2018 6:18 pm
Forum: Significant Figures
Topic: sig figs urgent question!
Replies: 12
Views: 616

Re: sig figs urgent question!

In this case, the two zeros in the number would be considered significant because they are between two other significant figures. This results in the entire number in having a total of four significant figures.
by Pritish Patil 1K
Sat Oct 06, 2018 6:15 pm
Forum: Limiting Reactant Calculations
Topic: Calculating the amount of moles
Replies: 3
Views: 109

Re: Calculating the amount of moles

In the beginning you should convert the 1kg of CaCO3(s) to grams (1kg=1000g). Secondly, divide by the molar mass for CaCO3 in order to get the number of moles. Because the chemical equation is already balanced, simply look at the mole ratio between CaCO3 and see how many moles of the product will be...

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