Search found 64 matches

by 005115864
Sun Mar 10, 2019 8:49 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanisms
Replies: 2
Views: 60

Reaction Mechanisms

Can someone explain to me how I would determine the molecularity of each elementary reaction in C2H5Br +OH- > C2H2OH + BR-?

Is the answer bimolecular? If not, can someone explain how I would approach this question?
by 005115864
Sun Mar 10, 2019 8:44 pm
Forum: Zero Order Reactions
Topic: Deeming what Order a molecule is
Replies: 2
Views: 46

Re: Deeming what Order a molecule is

Thank you so much! This cleared it up immensely.
by 005115864
Sun Mar 10, 2019 7:48 am
Forum: Zero Order Reactions
Topic: Deeming what Order a molecule is
Replies: 2
Views: 46

Deeming what Order a molecule is

Conceptually, how do I know what order each molecule is going off of words? When NO is doubled, the rate of reaction of 2NO +O2 > 2NO2 increases by a factor of 4. When both O2 and NO are doubled, increases by a factor of 8. How can I figure out the reactant orders? The answers for NO is second order...
by 005115864
Sun Mar 10, 2019 7:32 am
Forum: General Rate Laws
Topic: Using Average rate of one molecule for another
Replies: 1
Views: 40

Using Average rate of one molecule for another

Can someone explain to me how I can use the average rate to go from the production of one molecule to the consumption of another? For example, In the textbook, the example given is N2 + 3H2 > 2NH3 We are given that the average rate of rxn is 1.15 mmol/L*H NH3. a) How can I used this to find the cons...
by 005115864
Tue Feb 26, 2019 3:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Reducing Agent/ Oxidizing Agent Strength in Metals
Replies: 3
Views: 79

Reducing Agent/ Oxidizing Agent Strength in Metals

In question 14.85, in the 6th edition, it gives a list of metals being Al, Zn, Fe, Co, Ni, Cu, Ag, Au and asks to name the strongest reducing agent starting with the strongest reducing agent. The way I have written it above is the correct answer, however, the solutions manuel does not explain how th...
by 005115864
Sun Feb 24, 2019 3:29 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox equations in Basic conditions
Replies: 3
Views: 88

Balancing Redox equations in Basic conditions

Hi, I am having trouble knowing where to put the OH- and H2O when making my half reactions. I tried completing 14.5 in the 6th edition, but I just can't seem to figure it out. Can someone please explain?

An example is P4(s) > H2PO2^- +PH3
by 005115864
Fri Feb 22, 2019 10:41 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Driving forces
Replies: 2
Views: 64

Driving forces

How does one determine the driving force of dissolution?
by 005115864
Fri Feb 22, 2019 10:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Hw Ch.9 #75 (6th Edition) Residual Entropy
Replies: 2
Views: 46

Hw Ch.9 #75 (6th Edition) Residual Entropy

How does one one know the orientations of a cis versus trans molecule using MX2Y4?

The solutions manuel says cis has a total of 12 possible orientations and trans a total of 3 possible orientations.
by 005115864
Fri Feb 22, 2019 10:37 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Favor ability of Cell portential
Replies: 5
Views: 110

Favor ability of Cell portential

If Cell potential (E) is positive, what does that say about spontaneity and vice versa?
by 005115864
Mon Feb 18, 2019 11:33 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 4
Views: 85

Re: Gibbs Free Energy

Yes, K relates back to our topic of equilibrium so in essence, K is a value of products over reactants
by 005115864
Mon Feb 18, 2019 11:32 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal energy (U) of an isolated system
Replies: 17
Views: 503

Re: Internal energy (U) of an isolated system

Internal energy does not change in an isolated system since it isn't able to exchange heat with its surroundings!
by 005115864
Mon Feb 18, 2019 11:30 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Isolated system
Replies: 10
Views: 333

Re: Isolated system

Yes because it does not exchange heat with its surroundings!
by 005115864
Sat Feb 09, 2019 10:16 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 6th Edition Hw#8.111 Exothermic RXN
Replies: 1
Views: 59

6th Edition Hw#8.111 Exothermic RXN

Hi, can someone please explain why is it that an exothermic reaction needs to be cooled in order to maintain that constant temperature?
by 005115864
Sat Feb 09, 2019 10:16 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 6th Edition Hw#8.111 Exothermic RXN
Replies: 1
Views: 60

6th Edition Hw#8.111 Exothermic RXN

Hi, can someone please explain why is it that ab exothermic reaction needs to be cooled in order to maintain that constant temperature?
by 005115864
Wed Feb 06, 2019 7:34 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 6th Edition Hw #8.11 Reversible/Irreversible
Replies: 2
Views: 72

6th Edition Hw #8.11 Reversible/Irreversible

Hi! Can someone please explain the idea of irreversible and reversible reactions to me? I don't understand how to differentiate from the two and how calculate work based on the type of reaction.
by 005115864
Wed Feb 06, 2019 6:46 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 6th Edition Hw #8.3 Delta V
Replies: 1
Views: 53

6th Edition Hw #8.3 Delta V

Hi, I was just wondering how am I supposed to know that for me to calculate the change in volume for the finding work done using the given equation, I have to first use pi*r^2*d to find delta v? also, why is d 20.0 cm if that's how much the pump is depressed?
by 005115864
Mon Feb 04, 2019 11:18 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 3
Views: 70

Re: Bond Enthalpies

It's not necessary, but it is certainly helpful to apply what you already know how to do. For instance, I like to draw them out because I like to see what is similar and what is different and compare the molecules I'm looking at. That way, I don't have to count every single bond in the reaction, jus...
by 005115864
Mon Feb 04, 2019 11:16 am
Forum: Calculating Work of Expansion
Topic: Units for pressure
Replies: 10
Views: 167

Re: Units for pressure

Refer to the constants and go from there. If the problem gives you torr, and whatever constant you're using uses atm, then make sure to use atm in order to be able to cancel them out properly.
by 005115864
Mon Feb 04, 2019 11:14 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: kJ vs J
Replies: 9
Views: 167

Re: kJ vs J

Both are good, just be careful and pay attention to units because sometimes a constant will be given in joules instead of kj so then you have to convert to joules in order to cancel out.
by 005115864
Sun Jan 20, 2019 2:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th Edition Hw #12.79 using Strong Acids
Replies: 1
Views: 50

6th Edition Hw #12.79 using Strong Acids

Hi, I just wanted to confirm something. Since H2SO4 is a strong acid, we can automatically assume it dissociates completely, which is why when we are making an Ice table for the reaction H2SO4 +H2O -> HSO4^- + H3O^+, since we know that H2SO4 has an initial concentration of 0.15M, we can assume H30+ ...
by 005115864
Sun Jan 20, 2019 1:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th Edition Hw #12.69
Replies: 1
Views: 74

6th Edition Hw #12.69

Hi can someone please explain how they got the equation Al(H2O)6 +H2O -> H3O + AL(H2O)5OH from the initial given concentration which is 0.055 M AlCl3? I know I have to make an acid/base reaction but why 6 h2os?
by 005115864
Sun Jan 20, 2019 10:26 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th Edition Hw 11.89, Determining equation using grapg
Replies: 1
Views: 26

6th Edition Hw 11.89, Determining equation using grapg

Hi! Can someone explain how the stoichiometric coefficients are determined using the given graph? I understand that it is a dissociation reaction there for A will dissolve into B and C, but I dont understand how to calculate the stoichimetric coefficients and make a balanced equation.
by 005115864
Sat Jan 19, 2019 3:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle and Partial Pressure
Replies: 3
Views: 62

Le Chatelier's Principle and Partial Pressure

In question 11.69b, form the 6th edition, the formula given is CO + H20 > CO2 + H2. It asks what will happen to the partial pressure of CO2 if the partial pressure of CO is reduced. What I don't understand is why does reducing the partial pressure of CO decrease the amount of CO2. I thought using Da...
by 005115864
Sat Jan 19, 2019 11:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Stability of reactions using equilibrium constant
Replies: 1
Views: 103

Stability of reactions using equilibrium constant

How can I determine which reaction is more stable using K?

For example in 11.45, the question asks whether the dissociation of Cl2 or F2 is more stable. The k for Cl is 1.2*10^-7 and the k for F is 1.2*10^-4
by 005115864
Sat Jan 19, 2019 10:24 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th Edition Hw #11.45 Neglible Answers
Replies: 1
Views: 42

6th Edition Hw #11.45 Neglible Answers

Hi, I had a question regarding how to determine whether an answer is neglible or not when using the quadratic formula and getting two separate answers. In this homework problem, I determined that x=5.5x10^-6 or x=-5.5x10^-6. I know that to find out whether the answer is neglible or not, I have to pl...
by 005115864
Sat Jan 12, 2019 10:57 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6th Edition Hw#11.29
Replies: 2
Views: 53

6th Edition Hw#11.29

If Q equals 1.0 for the reaction N2+O2>2NO at 25 degrees Celsius, will the reaction have the tendency to forms products, reactants or stay at equilibrium? It says to refer to the apendix where we're given delta H and delta G I know i need to find K in order to compare it to Q. Why do we use use gibs...
by 005115864
Sat Jan 12, 2019 9:54 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice table
Replies: 4
Views: 81

Re: ice table

The +x is determined by the stoichiometric coefficients. For example if the product has a 2 in front of it, it would have to be +2x. We're adding the x because its the change in the reaction and since we are assuming this a forward reaction, we are using up the reactants (thus the minus reactant) an...
by 005115864
Sat Jan 12, 2019 9:49 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 12
Views: 206

Re: Kc and Kp

No they are not included in when solcing for Kc or Kp because and pure liquids don't have concentrations. Since solids and pure liquids aren't really mixed with other things, so that is why we can't really use them to calculate kc or kp. That is why it is ideal to use gases and aqueous solutions.
by 005115864
Sat Jan 12, 2019 9:38 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Kc
Replies: 4
Views: 101

Re: Calculating Kc

Using the balanced equation is imperative because the stoichiometric coefficients are needed in order to solve for KC as they are what you raise each concentration to the power of. Therefore you need the correct balanced ratio for each reaction and the stoichiometric coefficients are necessary.
by 005115864
Thu Dec 06, 2018 7:21 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: (6th Edition) #12.49
Replies: 1
Views: 43

(6th Edition) #12.49

Which is the stronger base, the hypobromite ion, BrO, or morphine, C17H19O3N? Justify your answer How can i tell which is stronger without pKb values? I already know HBrO is a relatively weak acid because it has a single bonded O-H and bromine is less electronegative so the electron cloud is fairly ...
by 005115864
Thu Dec 06, 2018 6:32 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: (6th Edition) #12.19
Replies: 1
Views: 54

(6th Edition) #12.19

Hi, the original question asks what is the difference of pH if HCl- were diluted by 12%. I understand the pH equation is -log(H+) but in this case why is it that we divide the H+ concentrations? The solutions manuel says we would use the equation, pH = -log(0.12[H]+/[H+]) = -log(0.12) = 0.92 why do ...
by 005115864
Sat Dec 01, 2018 5:43 pm
Forum: Hybridization
Topic: identifying hybridization of a central atom
Replies: 4
Views: 100

Re: identifying hybridization of a central atom

It also helps to think of the regions of electron distribution and whether one area is more localized with electrons. If the electron cloud is more localized, it is most definitely polar. If the electron cloud is evenly distributed, it is nonpolar.
by 005115864
Sat Dec 01, 2018 5:40 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE formula
Replies: 32
Views: 1449

Re: AXE formula

It's possible but be aware of that there are molecules with different shapes but same AXE Formula. This is because they have the same number of electron densities. For instance, tetrahedral and trigonal pyramidal are both AXE4 because they both have 4 regions of electron densities.
by 005115864
Sat Dec 01, 2018 5:34 pm
Forum: Hybridization
Topic: pi bonds
Replies: 5
Views: 138

Re: pi bonds

The 2 corresponds to the quantum number!! So since, C, N, and O are in 2P and S is in 3P and so forth!
by 005115864
Sun Nov 25, 2018 5:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hypothetical Shape Question
Replies: 2
Views: 76

Hypothetical Shape Question

If we were told to draw the lewis structure for C3H4, how would we determine which is best to draw if there are several possible structures you can draw with different hybridizations?
by 005115864
Sun Nov 25, 2018 4:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 3
Views: 91

Polarity

Why is ClF3 considered polar if it doesn't have a partial positive and partial negative attraction?
by 005115864
Sun Nov 25, 2018 4:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Ch.4 #73 (6th Edition)
Replies: 2
Views: 55

Ch.4 #73 (6th Edition)

Hi! I know none of the molecules is a radical, but suppose one of them were how does one tell if it is a radical by looking at the configuration?
by 005115864
Sun Nov 25, 2018 4:26 pm
Forum: Hybridization
Topic: Hw: Ch.4 #43 (6th Edition)
Replies: 1
Views: 26

Hw: Ch.4 #43 (6th Edition)

Can someone describe what s-character is? Does it have to do with the s-orbital?
by 005115864
Sun Nov 25, 2018 4:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hw: Ch.4 #73 (6th Edition)
Replies: 2
Views: 88

Hw: Ch.4 #73 (6th Edition)

Hi! I was wondering why in the cans of CH2^2-, why is the bond angle still less than 109.5 degrees if it has two lone pairs directly opposite of each other? I was under the impression that if we have an even amount lone pairs opposite to another, they will cancel out so the Lone Pair repulsions will...
by 005115864
Thu Nov 15, 2018 5:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ch.3 #19 (6th Edition)
Replies: 2
Views: 96

Ch.3 #19 (6th Edition)

Hi! Can someone please explain to me why it is more favorable to take an electron from the p subshell if it is already half filled? I thought half-filled subshells were most favorable so taking an electron from something that is already half-filled will make the atom less stable? Problem: Sb3+ Answe...
by 005115864
Thu Nov 15, 2018 5:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th Edition Hw #39
Replies: 1
Views: 51

6th Edition Hw #39

Hi ! Can someone explain to me why NH4CL is drawn separately?

I understand NH4 has a +1 charge and Cl by itself has a -1 charge so they are attracted to each other but why not draw them as a compound?
by 005115864
Sun Nov 11, 2018 10:06 pm
Forum: Lewis Structures
Topic: Noble Gas Valence Electrons
Replies: 3
Views: 121

Noble Gas Valence Electrons

Hi! Can someone explain to me why in the lewis structure for XeF2 why does Xe, the central atom have 3 sets of lone pairs? I know that noble gases have a valence electron number of 8 but in this example it has 10 and while I know Xe can exceed the octet rule, how do I know to add those extra electro...
by 005115864
Thu Nov 08, 2018 6:21 pm
Forum: Dipole Moments
Topic: Permanent Dipole Moments
Replies: 4
Views: 325

Re: Permanent Dipole Moments

A permament Dipole moment is when the difference of electronegativity between two atoms is so large that it holds a partial positive and partial negative charge. Hope this helps! :)
by 005115864
Thu Nov 08, 2018 5:41 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Solubility
Replies: 2
Views: 60

Ionic Solubility

Hi! I have a question concerning ionic solubility. Can someone please explain why it is that increasing covalent of silver halides (AgF, AgCl, AgBr)makes them less soluble?
by 005115864
Thu Nov 08, 2018 5:19 pm
Forum: Lewis Structures
Topic: Double Bonds
Replies: 7
Views: 180

Re: Double Bonds

Hi ! I kind of see this as a game of seeing what best works. "What best works" is determined by the formal charge. That is to say, if the formal charge of EACH individual element is close to zero then it is MOST stable. However, if the molecule as an entirety has a charge, you would want t...
by 005115864
Mon Nov 05, 2018 7:42 am
Forum: Trends in The Periodic Table
Topic: Higher Electron Affinity Nitrogen or Carbon
Replies: 4
Views: 315

Re: Higher Electron Affinity Nitrogen or Carbon

If you ever forget, the period trend of electron affinity genrally follows both Ionization energy and electronegativity. >> Increases as you go to the right and decreases down a group. Remember electron affinity is related to the energy released when an electron is added to a neutral atom in order t...
by 005115864
Mon Nov 05, 2018 7:33 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What is delta V when given +-5 for example?
Replies: 3
Views: 393

Re: What is delta V when given +-5 for example?

Hi, this is the UNCERTAINTY given so yes you would have to go 10 and 5 for the uncertainty because you're given the uncertainty of velocity in order to find the most accurate position (delta x) Think of it as a trade off, if you have the a certain momentum, then you must have an uncertain position, ...
by 005115864
Mon Nov 05, 2018 7:29 am
Forum: Lewis Structures
Topic: Midterm Practice with Unpaired Electrons
Replies: 2
Views: 103

Midterm Practice with Unpaired Electrons

Hi all, I have a practice problem that I need help on. The question is: For the following molecules how many unpaired electrons are there for each molecule? O2 and C2^- So for this, I don't know why they gave us the molecules in diatomic form but I treated it as a normal atom and did a a drawn out e...
by 005115864
Sun Oct 28, 2018 3:02 pm
Forum: Lewis Structures
Topic: Ground State e- Configuration
Replies: 3
Views: 69

Re: Ground State e- Configuration

Hi, to answer your question simply, an element has the tendency to seek stable energy levels. So, in this case stability would be filling the 4d energy level completely before starting to fill the 5s energy level. It typically is easier to fulfill an energy level completely before jumping to a highe...
by 005115864
Sun Oct 28, 2018 2:59 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ionization of elements
Replies: 3
Views: 113

Re: Ionization of elements

This is due to fact that elements have the tendency to look for more stable states. Therefore, to have a stable ground state, elements tend to follow the Pauli exclusion principle and Hund's rule. If these rules are not followed, then it is in an excited state.
by 005115864
Sun Oct 28, 2018 2:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework 2.45d
Replies: 1
Views: 67

Re: Homework 2.45d

Hi, this has to do with the fact that ground-state electron configurations means numbers of electrons = number of protons. Add all the electrons in the ground-state electron configuration and find the same number on the periodic table and you will get the element predicted to have that configuration.
by 005115864
Sun Oct 28, 2018 2:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configs from Periodic Table
Replies: 1
Views: 31

Re: Electron Configs from Periodic Table

Essentially, yes it is just a periodic table trend. Since the periodic table was organized by atomic number there is a discrepancy when it comes to organizing the energy levels, however, since 3d is a lower energy level than 4s, then we would write it as a 1s^2,2s^2,2p^6,3s^2,3p^6,3d^10,4s^2. It is ...
by 005115864
Sun Oct 21, 2018 4:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter2, #39, Electron Config. Arrow Graph
Replies: 1
Views: 40

Chapter2, #39, Electron Config. Arrow Graph

Hi! Hi I need help interpreting number 39 in chapter 2 for the electron configuration arrow graphs. It says we have to identify which graphs represent excited states and which graphs represent ground states. This was a homework problem from the Quantum Mechanics in Chapter 2 part of the syllabus how...
by 005115864
Sun Oct 21, 2018 4:08 pm
Forum: Properties of Electrons
Topic: Electron Spin
Replies: 7
Views: 394

Re: Electron Spin

Hi! Electron spins are similar to orientation except it's just the way an electron spins whether that be clockwise or counter clockwise! It's not really a value that can be changed it is just a property that was found of electrons upon observing them. If you recall, in the lecture, we discussed the ...
by 005115864
Sun Oct 21, 2018 4:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: shells
Replies: 2
Views: 76

Re: shells

Hi!
Dr. Lavelle said we didn't have to worry about that in the test since it goes beyond the scope of the class. He won't give anything that messy, and as long as you understand the basics, you'll be fine. It's the same as the F subshell.
by 005115864
Sun Oct 21, 2018 4:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Negative Sign in front of Rydberg constant
Replies: 1
Views: 289

Re: Negative Sign in front of Rydberg constant

Hi! Basically, to understand this, we have to think of it as what will give us a positive number in the end if you're dealing with Delta Energy. In this case, a negative is in front because you're subtracting nInitial-nFinal which will result in a negative number so adding a negative in the front wi...
by 005115864
Sat Oct 13, 2018 1:27 pm
Forum: Properties of Light
Topic: Properties of Light - variables?
Replies: 2
Views: 45

Re: Properties of Light - variables?

Hi! Can you clarify what you variables you want defined? As for what is the variable for the speed of light, the variable is c which is 3.00 * 10^8 m/s and it is found in the lambda = h*c/E equation lambda= wavelength h= Planck's constant which is 6.626*10^-34 J*S and E is the total energy emitted o...
by 005115864
Wed Oct 10, 2018 2:49 pm
Forum: Properties of Light
Topic: Photoelectric Effect PostMod #34
Replies: 1
Views: 54

Photoelectric Effect PostMod #34

Hi, I need help answering part b of this problem. Here is the entire question; 33. Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10^15 s-1 before it can emit an electron from its surface. Answer the following two questions. A. What is the minimum energy needed to produce ...
by 005115864
Wed Oct 10, 2018 8:28 am
Forum: Properties of Light
Topic: Photoelectric Effect PostMod #30
Replies: 1
Views: 53

Photoelectric Effect PostMod #30

This question is related to #28 and #29 but I have gotten stuck on #30. The Question is.. Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. What is the frequency of the incident light on the sodium metal su...
by 005115864
Wed Oct 10, 2018 8:03 am
Forum: Photoelectric Effect
Topic: Post-Mod Problem #28
Replies: 4
Views: 101

Re: Post-Mod Problem #28

Hi! I'm still confused about how that got us the answer. I understand the equations we're supposed to use and where everything goes but the one part I am still confused about is the work function. If the work function is 150.6 KJ, shouldn't we first convert that to joules which would be 1.506x10^-5....
by 005115864
Wed Oct 03, 2018 7:58 am
Forum: Limiting Reactant Calculations
Topic: Two Limiting Reactants
Replies: 6
Views: 174

Re: Two Limiting Reactants

Speaking from experience, it is possible to have more than one limiting reactant if you think of it this way, there are not always just two reactants. Sometimes you have more than two, in that case, you will have several limiting reactants and your greatest number will be the excess.
by 005115864
Tue Oct 02, 2018 10:12 pm
Forum: Empirical & Molecular Formulas
Topic: Question F3(6th Edition)
Replies: 3
Views: 73

Re: Question F3(6th Edition)

Hi, Okay so this is a question that is testing your knowledge on polyatomic ions and acids which should've been a topic covered in your high school chemistry class. To start off, nitric acid has the word acid in it and knowing from general chemical rules, almost all acids begin with a hydrogen which...
by 005115864
Tue Oct 02, 2018 9:56 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental L.39
Replies: 6
Views: 126

Re: Fundamental L.39

Hi, I just wanted to share something interesting I found. Another way to solve this problem, oddly enough, is by simply creating a balanced equation. Because they explicitly tell us the reactants and ultimate product, I simply combined Tin and Oxygen to make my product. In this case, the molecular a...
by 005115864
Tue Oct 02, 2018 5:32 pm
Forum: Empirical & Molecular Formulas
Topic: Question M19 (6th edition)
Replies: 3
Views: 319

Re: Question M19 (6th edition)

In this example, yes. While it is standard that you always add up the masses to make sure they add up to the total mass, it is important to note that this is an example of combustion. In general, combustion questions always include what is being burned plus oxygen, so that oxygen should be an expect...

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