Search found 73 matches
- Fri Mar 15, 2019 5:49 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Finding reverse activation energy
- Replies: 1
- Views: 1059
Re: Finding reverse activation energy
To find the reverse activation energy, you must first be told that the reaction is reversible, as otherwise it may take a completely different reaction pathway during the reverse reaction and the reverse activation energy cannot be calculated. If the reaction is reversible, you also must be given a ...
- Fri Mar 15, 2019 5:44 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2
- Replies: 5
- Views: 492
Re: Test 2
Rank the following species in order of increasing reducing power going from their neutral to second oxidation state: Pt, Pb, Cu. How do we know this? As a general trend, the reducing power of an electrolytic half cell increases as the value of E cell decreases (can be thought of as becoming more neg...
- Fri Mar 15, 2019 5:43 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2
- Replies: 5
- Views: 492
Re: Test 2
Rank the following species in order of increasing reducing power going from their neutral to second oxidation state: Pt, Pb, Cu. How do we know this? As a general trend, the reducing power of an electrolytic half cell increases as the value of E cell decreases (can be thought of as becoming more neg...
- Thu Mar 14, 2019 12:54 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb calorimeter
- Replies: 6
- Views: 898
Re: Bomb calorimeter
Hi! The fundamental thing that you have to know is different between a bomb calorimeter and a normal calorimeter is that in a bomb calorimeter, the volume is held constant. This means that there is no work done in a bomb calorimeter, and therefore any change in the internal energy is dependant on th...
- Thu Mar 14, 2019 12:48 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: cell diagrams
- Replies: 6
- Views: 696
Re: cell diagrams
Cell diagrams frequently follow the structure of solid|liquid|aqueous||aqueous|liquid|solid. If the liquid is H20, you need not include it in the diagram. The solids on the outsides of the diagram also may not be needed if one of the reactants is a solid already, so a conducting metal is not needed.
- Thu Mar 14, 2019 12:45 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Effect of concentration on cell potential
- Replies: 2
- Views: 345
Re: Effect of concentration on cell potential
Concentration has a profound effect on cell potential. They are related through the Nerst Equation, which states; E = E deg cell + ((RT)/(nF))lnQ Where E deg cell is the original cell potential, R = gas constant, T = temp, n = number of moles of electrons transferred in the reaction, F = Faraday's c...
- Wed Mar 06, 2019 8:37 pm
- Forum: Second Order Reactions
- Topic: unique rate
- Replies: 1
- Views: 229
Re: unique rate
The unique rate of a reaction (for a reaction in the general form aA---->bB) is -(1/a)(dA/dt)=(1/b)(dB/dt). For that particular question, my guess would be that it is not included because we cannot accurately calculate (dA/dt) or (dB/dt) since we are given average rates of change rather than instant...
- Wed Mar 06, 2019 8:31 pm
- Forum: Zero Order Reactions
- Topic: General Meaning of "Zero Order" Reactions
- Replies: 7
- Views: 738
Re: General Meaning of "Zero Order" Reactions
This means that the reaction rate does not depend on the particular amount of a specific reactant (that is 0 order).
- Wed Mar 06, 2019 8:30 pm
- Forum: Second Order Reactions
- Topic: Pseudo-first-order reaction
- Replies: 4
- Views: 511
Re: Pseudo-first-order reaction
You can do this by saturating the concentration of one of the reactants to the point where any subsequent increase in it will no longer affect the reaction rate. This will, therefore, relate any new change in the reactant rate to an increase in the other reactant, creating a pseudo-first order react...
- Wed Mar 06, 2019 8:28 pm
- Forum: Second Order Reactions
- Topic: Zero vs. Second Order slopes
- Replies: 3
- Views: 392
Re: Zero vs. Second Order slopes
You have to be careful when comparing what the slopes signify when comparing the slopes of different order reactions. Remember that for a 0 order reaction, the axes are time and [Reactant] whereas the slopes of a 2nd order reaction graph are time and 1/[reactant]. Direct graphical comparisons are th...
- Wed Mar 06, 2019 8:19 pm
- Forum: Second Order Reactions
- Topic: deriving the integrated rate laws
- Replies: 2
- Views: 339
Re: deriving the integrated rate laws
I dont expect there to be a question which explicitly asks us to derive a particular rate law, but knowing their derivations may be useful for more applied questions during which you may forget a particular formula. At that point, you could simply derive it and not miss unnecessary points :)
- Wed Mar 06, 2019 8:17 pm
- Forum: Zero Order Reactions
- Topic: Unit for rate constant for zeroth-order reaction
- Replies: 2
- Views: 479
Re: Unit for rate constant for zeroth-order reaction
The units for a 0th order reaction can simply be determined from setting the normal rate law units = to the rate constant times whatever reactant raised to whatever order the reaction is. For 0 order, [mols*L^-1*s^-1]=k[A]initial^0 (0 order reaction). This would simplify to [mols*L^-1*s^-1]=k(1) The...
- Sun Feb 24, 2019 11:37 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Adding Cell Potentials
- Replies: 2
- Views: 282
Re: Adding Cell Potentials
Cell potentials are a fixed property, so they do not depend upon the stoichiometric coefficients relating the number of electrons in each half reaction.
- Sun Feb 24, 2019 11:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Wmax=-nFE
- Replies: 1
- Views: 444
Re: Wmax=-nFE
You are correct, Wmax only is equal to -nFE when the temperature and pressure are constant. Remember that Wmax is derived from a reversible reaction, which must occur at conditions of constant temp and pressure.
- Sun Feb 24, 2019 11:34 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test 2
- Replies: 9
- Views: 1115
Re: Test 2
All of the aspects of Gibbs Free Energy including the Van't Hoff equation and other related formulas. I would expect that there may be some interwoven questions related to enthalpy and entropy woven in to the test as well.
- Sun Feb 17, 2019 4:13 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Midterm Grades
- Replies: 35
- Views: 2775
Re: Midterm Grades
By Friday of week 7 is when my TA told me we will get them back by.
- Sun Feb 17, 2019 4:12 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 8
- Views: 878
Re: Bond Enthalpies
Yes, you are correct. The formula is the summation of the bonds broken minus the summation of the bonds formed.
- Sun Feb 17, 2019 4:11 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy Definition
- Replies: 4
- Views: 442
Re: Gibbs Free Energy Definition
The amount of available energy in a system which is available to do work.
- Sun Feb 17, 2019 4:10 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible v irreversible
- Replies: 4
- Views: 781
Re: Reversible v irreversible
It means that temperature is maintained constant and that there is an infinitesimally small pressure difference, resulting in us having to use the integral to solve.
- Sun Feb 17, 2019 4:08 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work done vs work on system
- Replies: 18
- Views: 3898
Re: Work done vs work on system
When it says that there is work done onto a system, the value is positive. When it says there is work done by the system, the value is negative for the system.
- Sun Feb 17, 2019 4:06 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: state functions and properties
- Replies: 11
- Views: 6033
Re: state functions and properties
A state function is a function which does not depend upon the path taken to reach a particular final point. Observations of the behavior are valid by simply looking at the final and initial point. An example of a state property Entropy
- Tue Feb 05, 2019 12:50 am
- Forum: Phase Changes & Related Calculations
- Topic: HW 8.41 6th edition
- Replies: 2
- Views: 361
Re: HW 8.41 6th edition
The important part of this question is that the block of ice is at 0 degrees Celcius, meaning that any increase in energy inputted would be used towards the melting of ice and the subsequent increasing of temperature of the resulting water.
- Tue Feb 05, 2019 12:49 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: U total - 3/2nRT
- Replies: 3
- Views: 441
Re: U total - 3/2nRT
This equation was briefly mentioned in the derivation of the formula for the reversible, isothermic reaction formula to solve for the amount of work done by a system. The more important system to know in-depth is the work formula for a reversible reaction
w=-nRTln(Vfinal/Vinitial)
w=-nRTln(Vfinal/Vinitial)
- Tue Feb 05, 2019 12:45 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: PdeltaV with Solids and Liquids
- Replies: 3
- Views: 342
Re: PdeltaV with Solids and Liquids
By nature of the formula and the relationship PV=nRT, if the pressure of the system is maintained at a constant value, there can be no fluctuation in the value of V, therefore making delta V 0 and the overal p*deltav term insignificant.
- Tue Feb 05, 2019 12:43 am
- Forum: Calculating Work of Expansion
- Topic: q and delta H
- Replies: 3
- Views: 378
Re: q and delta H
They are interchangeable terms only when the pressure of the system in question is constant.
- Wed Jan 30, 2019 1:23 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 6th Edition Problem 8.21
- Replies: 8
- Views: 863
Re: 6th Edition Problem 8.21
The general concept that is used here is heat lost by the copper= -heat gained by the water. In the formula, the only thing that is a little bit tricky is that you have to use (Tfinal-Tinitial) for the variable delta T, then use algebra to simplify the equation to solve for Tfinal.
- Wed Jan 30, 2019 1:21 am
- Forum: Phase Changes & Related Calculations
- Topic: Units: Joules vs kJ
- Replies: 5
- Views: 562
Re: Units: Joules vs kJ
I don't think it should really matter, but for safety, I would be consistent with the units that were presented initially in the problem.
- Wed Jan 30, 2019 1:19 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 8
- Views: 778
Re: Heat Capacity
Yes, heat capacity is an extensive property because it depends upon the amount of a certain substance there is present.
- Sun Jan 20, 2019 12:46 am
- Forum: Ideal Gases
- Topic: kc vs kp
- Replies: 19
- Views: 3495
Re: kc vs kp
If you are referring to its use in an ICE table, Kp can only be used when all of the values in the molecules represented in the equilibrium expression for that particular chemical equation are in the gas phase.
- Sun Jan 20, 2019 12:44 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: X Value
- Replies: 3
- Views: 360
Re: X Value
The rule is that if the value of either Ka or Kb is less that 10^-3 so it is fine to disregard x for a value of 10^-4.
- Sun Jan 20, 2019 12:37 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Arrow
- Replies: 7
- Views: 1044
Re: Equilibrium Arrow
As Dr. Lavelle depicted in class, the arrow in the chemical equation for any reaction involving a strong acid or a strong base is simplified as being one arrow because of the overwhelming skew it has to one side of the reaction. This does not mean that the reverse reaction is not occurring, but only...
- Sun Jan 20, 2019 12:30 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Change in Pressure
- Replies: 2
- Views: 321
Re: Change in Pressure
If the volume of a container decreases and pressure increases, a reaction will favor the side of the equation which contains less moles of gas because of the equations goal of reestablishing equilibrium.
- Wed Jan 16, 2019 5:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Conjugates
- Replies: 5
- Views: 485
Re: Conjugates
It is built off of the equation that Ka*Kb=Kw and if Kw is a constant, any increase in Ka or Kb respectively will lead to a decrease in the other variable in each case.
- Wed Jan 16, 2019 5:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solids and liquids in K
- Replies: 6
- Views: 2187
Re: Solids and liquids in K
You don't include liquids in your equilibrium expressions because they occur in such large amounts that they are considered the solvents of the chemical reaction. Any reaction that occurs using a liquid will not provide a large enough change to that liquids concentration so as to require us to inclu...
- Wed Jan 16, 2019 5:00 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: question from module
- Replies: 4
- Views: 413
Re: question from module
When the volume of the container is decreased, the pressure in the container is therefore increased. This increase in the pressure will cause the reaction to shift towards the side of the chemical equation with fewer moles of gas. Therefore, the equation will shift towards the products. When the tem...
- Wed Jan 09, 2019 5:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating the Equilibrium Composition in ATP Hydrolysis
- Replies: 4
- Views: 369
Re: Calculating the Equilibrium Composition in ATP Hydrolysis
The value of Pi and ADP are equivalent to the reduction in the amount of ATP because they are represented with a stoichiometric coefficient of 1 in the equation ATP <--> ADP + Pi. Similar to when we calculated the amount of product created in a limiting reagent problem.
- Wed Jan 09, 2019 5:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: solving for equilibrium constants
- Replies: 3
- Views: 85
Re: solving for equilibrium constants
It depends upon if the question initially gives you a Kc value, for which you would have to use concentration measurements, or if the problem gives a Kp value, for which you would use partial pressure measurements.
- Wed Jan 09, 2019 5:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Bar vs. atm
- Replies: 4
- Views: 237
Re: Bar vs. atm
They are both measurements of pressure in a system for the equilibrium expression. There is no difference in their usages in the context of a problem, but if you are converting from a concentration to a partial pressure (or vice versa), make sure that the constant R is in the correct units of either...
- Wed Jan 09, 2019 5:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Brackets vs P For Equilibrium Constants
- Replies: 4
- Views: 207
Re: Brackets vs P For Equilibrium Constants
When you are given concentrations, you must use the brackets as the notation. When partial pressures are given, the brackets are not necessary for writing the equilibrium constant expression.
- Wed Dec 05, 2018 11:20 am
- Forum: Naming
- Topic: Knowing oxidation states
- Replies: 11
- Views: 954
Re: Knowing oxidation states
Yes, it is very common for Professor Lavelle to ask us to find the oxidation of a particular transition metal in the context of a coordination compound. These can normally be algebraically solved for, but you do need to know the oxidation states of some common ligands.
- Wed Dec 05, 2018 11:17 am
- Forum: Polyprotic Acids & Bases
- Topic: Significance of Polyprotic Acids & Bases
- Replies: 6
- Views: 1002
Re: Significance of Polyprotic Acids & Bases
It's important to know that polyprotic acids and bases have the ability to accept/donate more than one hydrogen ion. These polyprotic acids and bases have the ability to have a much stronger effect on the resulting solution pH, as they can greatly influence the hydrogen ion concentration within a pa...
- Wed Dec 05, 2018 11:14 am
- Forum: Lewis Acids & Bases
- Topic: Resonance in acids
- Replies: 3
- Views: 429
Re: Resonance in acids
If an acid's corresponding conjugate base depicts resonance, it means that the resulting conjugate base is a more stable molecule, thus meaning that the original acid is a strong acid.
- Wed Dec 05, 2018 11:12 am
- Forum: Naming
- Topic: Anionic ligands
- Replies: 5
- Views: 608
Re: Anionic ligands
Both versions can be used, as they simply relate to old and new regulations of naming coordination compounds.
- Wed Dec 05, 2018 11:11 am
- Forum: Naming
- Topic: naming differences
- Replies: 6
- Views: 634
Re: naming differences
I am not sure about the first name that you wrote, but the following two are both accepted and are interchangeable. One is just by older coordination compound naming regulations and the other is not.
- Wed Dec 05, 2018 11:07 am
- Forum: Naming
- Topic: Transition Metal
- Replies: 4
- Views: 463
Re: Transition Metal
In this class, we only have to worry about coordination compounds which have a mono-transition metalcore.
- Wed Dec 05, 2018 11:06 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric clarification
- Replies: 5
- Views: 549
Re: Amphoteric clarification
Yes, it is highly unlikely for an amphoteric molecule to act as both an acid and a base at one time because it would require the simultaneous donation and acceptance of a hydrogen ion by that molecule.
- Sat Dec 01, 2018 4:50 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate
- Replies: 6
- Views: 613
Re: Chelate
A chelate is formed when there are multiple polydentate anions bonding to a transition metal in a ring formation around it. Chelates are formed by polydentates, but not all polydentates contribute to the formation of chelates.
- Sat Dec 01, 2018 4:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate Ligand
- Replies: 3
- Views: 298
Re: Polydentate Ligand
A molecule is polydentate when it can bind at 2 or more different locations. These locations are determined if there are lone pair electrons available for coordinate bonding.
- Sat Dec 01, 2018 4:43 pm
- Forum: Naming
- Topic: Order of Ligand Naming
- Replies: 6
- Views: 575
Re: Order of Ligand Naming
You name the ligands in a coordination compound in alphabetical order.
- Sat Dec 01, 2018 4:41 pm
- Forum: Naming
- Topic: Water as a ligand
- Replies: 4
- Views: 174
Re: Water as a ligand
To denote that the lone pair that is active in bonding is located on the Oxygen atom on H20.
- Thu Nov 22, 2018 11:05 pm
- Forum: Hybridization
- Topic: determining shape from given information
- Replies: 3
- Views: 383
Re: determining shape from given information
Not necessarily. Knowing the hybridization surrounding a particular atom in a molecule tells you the number of regions of electron density around that atom. This allows you to know the initial VSEPR molecular geometry, but you cannot know the exact altered molecular shape unless you also know the nu...
- Thu Nov 22, 2018 10:49 pm
- Forum: Sigma & Pi Bonds
- Topic: Carbon Pi bond hybridization
- Replies: 2
- Views: 335
Re: Carbon Pi bond hybridization
The sp2 hybridized orbital would look like this: p _ sp2 _ _ _ Three sigma bonds can be formed within the hybridized sp2 orbitals. The presence of the one excess p orbital allows for pi bonding to also occur. Conceptually, the easiest way to figure out whether sigma/pi bonding will occur is to look ...
- Thu Nov 22, 2018 10:41 pm
- Forum: Sigma & Pi Bonds
- Topic: Drawing bonds
- Replies: 3
- Views: 394
Re: Drawing bonds
Since we have only slightly been introduced to this concept in the lectures, I do not believe that we will be asked to draw these on the exams. In spite of this, however, sigma bonds are bonds which are formed when the orbitals bond along a particular bonding plane. Pi bonds are formed when the bond...
- Thu Nov 22, 2018 10:39 pm
- Forum: Dipole Moments
- Topic: Canceling?
- Replies: 3
- Views: 407
Re: Canceling?
Correct, when all of the individual dipole vectors of a molecule cancel out, then the overall molecule is nonpolar.
- Mon Nov 12, 2018 10:53 am
- Forum: Dipole Moments
- Topic: Polarizability vs Polarizing Power
- Replies: 4
- Views: 348
Re: Polarizability vs Polarizing Power
Essentially the two terms are opposites. Polarizing power is the ability for a certain cation to distort an anion. More positively charged cations such as Al3+ have a greater polarizing power compared to lesser charged ions. The tendency of the anion to become polarized by the cation is known as its...
- Mon Nov 12, 2018 10:44 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Chapter 4 Homework Number 1
- Replies: 6
- Views: 481
Re: Chapter 4 Homework Number 1
Whenever there is a lone pair present on the central atom of a molecule, the bond angles will always be reduced due to the repulsion which is now experienced as a result of the lone pair.
- Mon Nov 12, 2018 10:42 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How do you utilize the VSEPR model?
- Replies: 4
- Views: 463
Re: How do you utilize the VSEPR model?
The VSEPR model is a tool primarily used for the identification of molecular shape and orientation based upon the number of bonding and lone pairs present in a molecule. The tricky part with the VSEPR model is actually memorizing the names of all the shapes and what number of bonding and lone pairs ...
- Sat Nov 03, 2018 11:38 pm
- Forum: Octet Exceptions
- Topic: Radicals
- Replies: 3
- Views: 332
Re: Radicals
Radicals would occur if an atom becomes an ion and has an odd number of electrons. In addition, in the bonding of a particular molecule with an odd number of atoms, radicals frequently occur. It is standard procedure to assign radical electrons to an element in a particular molecule that would lesse...
- Sat Nov 03, 2018 11:35 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Subshells
- Replies: 2
- Views: 535
Re: Subshells
It means that that particular element has empty subshells. The subshells always exist for the n=4 energy level, they just may not always be filled depending on the element.
- Sat Nov 03, 2018 11:32 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chem Midterm
- Replies: 13
- Views: 1171
Re: Chem Midterm
8 questions, each with multiple parts. The test in total is 110 points, accounting for 22 percent of our overall grade.
- Sat Nov 03, 2018 11:31 pm
- Forum: Trends in The Periodic Table
- Topic: Second and First Ionization Energy
- Replies: 2
- Views: 372
Re: Second and First Ionization Energy
After the first ionization energy, the element has now become a charged ion which has a high attraction between the protons in the nucleus and the electrons. Attempting to remove another electron is much more difficult than removing the first (higher ionization energy) because you now have to counte...
- Sat Nov 03, 2018 11:29 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Valence Electrons
- Replies: 2
- Views: 274
Re: Valence Electrons
No, we are not required to know the charges (valence electrons) of the D-block elements because they have ranging values.
- Wed Oct 24, 2018 11:12 am
- Forum: Properties of Light
- Topic: kg or g [ENDORSED]
- Replies: 11
- Views: 1684
Re: kg or g [ENDORSED]
All equations in this chapter use kilograms because it is the SI base unit. In addition, in any equation which deals with Joules, kilograms is always used for the mass in order to make sure that the units of both cancel.
- Wed Oct 24, 2018 11:07 am
- Forum: Trends in The Periodic Table
- Topic: Electronegativaty
- Replies: 2
- Views: 214
Re: Electronegativaty
Electrons always aim to find the lowest energy state in their respective orbitals. Electrons in elements such as Chromium and Copper remove an electron from the 4s orbital and add it to the 3d orbital because having all the orbitals in the d subshell half-full has a lower energy requirement than hav...
- Wed Oct 24, 2018 11:05 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Shielding effect
- Replies: 6
- Views: 1183
Re: Shielding effect
The shielding effect basically describes the reduced attraction of a nucleus to its electrons the more filled energy levels there are. For example, in terms of electron ionization energy, it would be much easier to remove an electron from Potassium (4s1) rather than Lithium (2s1) because of the grea...
- Tue Oct 09, 2018 1:55 am
- Forum: Limiting Reactant Calculations
- Topic: How to find the limiting reactant easily and quickly
- Replies: 5
- Views: 13792
Re: How to find the limiting reactant easily and quickly
Think about simple ratios when dealing with limiting reactant questions. The easiest way is to convert both reactant quantities into moles of the particular product that we are solving for. This will allow you to easily observe which one of the reactants produces the least amount of product and is, ...
- Tue Oct 09, 2018 1:52 am
- Forum: Photoelectric Effect
- Topic: Other Sources of energy
- Replies: 1
- Views: 174
Re: Other Sources of energy
Light is the most general form through which photons are transmitted. The only necessity for electrons to be emitted from the metal is that they are struck with a ray of a particular FREQUENCY of energy. If that can be transmitted through mediums other than light, then yes. But light is the most cla...
- Tue Oct 09, 2018 1:49 am
- Forum: Photoelectric Effect
- Topic: Kinetic Energy of Emitted Electron
- Replies: 1
- Views: 163
Re: Kinetic Energy of Emitted Electron
As Lavelle stated in the lecture, the experimental design in the experiment included calculations which discounted the velocity which is obtained from the opposite charges attracting the electron to the detector.
- Tue Oct 09, 2018 12:33 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework due this Week [ENDORSED]
- Replies: 4
- Views: 483
Re: Homework due this Week [ENDORSED]
You can turn in questions that are shown in both outline 1 and 2
- Sun Sep 30, 2018 9:49 pm
- Forum: SI Units, Unit Conversions
- Topic: Grams/mole
- Replies: 12
- Views: 1199
Re: Grams/mole
In short, yes, the two notations mean the exact same thing. Anything raised to the negative 1st power will always go to the denominator, making the two short-hands directly interchangeable. There have been no instances in which I have seen that there makes a significant difference when one notation ...
- Sun Sep 30, 2018 9:46 pm
- Forum: Significant Figures
- Topic: Significant Figures
- Replies: 10
- Views: 2883
Re: Significant Figures
Generally, you want to use exact values through the entire calculation until you reach your final answer. When you get to the final answer, you notate it according to the number with the least number of significant digits in the entire problem. Hypothetical Example: 2.37 x 2.5 = 5.925 Lowest number ...
- Sun Sep 30, 2018 9:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Solutions Manual
- Replies: 9
- Views: 1864
Re: Solutions Manual
There are many free PDFs of the solution manuals available online that can be found with some deep web hunting. I wouldn't recommend paying the sky-high price of the manual for something you won't even look at for more than a minute at a time. If you need the PDF, let me know.
- Sun Sep 30, 2018 9:30 pm
- Forum: Balancing Chemical Reactions
- Topic: Short cuts/methods for balancing equations
- Replies: 15
- Views: 1787
Re: Short cuts/methods for balancing equations
When I begin to balance a chemical equation, I balance elements that only appear once on both sides of the chemical equation first. When there are two unique elements that appear once on both sides of the chemical equation, begin with the gaseous element (when hydrogen is present, balance it last ou...