## Search found 99 matches

Sun Mar 15, 2020 7:52 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: SHE
Replies: 3
Views: 95

### SHE

Is the standard hydrogen electrode always the anode?
Sun Mar 15, 2020 7:51 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: lnQ
Replies: 4
Views: 132

### lnQ

for the value of Q, I know it uses the concentration of products and reactants; but for the coefficients, would we need to raise it to the power of the balanced redox reaction?
Sun Mar 15, 2020 7:48 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Replies: 1
Views: 73

I know adiabatic means that no energy is transferred as heat; is there any formula we need to know along with this word definition?
Sun Mar 15, 2020 7:47 am
Forum: Calculating Work of Expansion
Topic: w = -p(deltaV) [ENDORSED]
Replies: 1
Views: 88

### w = -p(deltaV)[ENDORSED]

if we're given the mass of water, and an accompanying density, I know we use the formula m/deltaDensity. however, we're given the density of both h20 in its liquid form and in its ice form. which do we use?
Sun Mar 15, 2020 7:45 am
Forum: Calculating Work of Expansion
Topic: reversible expansion
Replies: 4
Views: 94

### reversible expansion

I know the formula with the integral is for the reversible expansion, but does anyone know what the area under the curve means?
Sun Mar 15, 2020 7:43 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: enthalpy constants?
Replies: 4
Views: 210

### enthalpy constants?

what exactly was the purpose of the 3/2R and 5/2R constants? when would we need to use them?
Sat Mar 14, 2020 7:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: bars
Replies: 3
Views: 31

### bars

when working with cell potentials and the nernst equation, what do we do when we're given a quantity with bars as the unit? do we convert to M?
Sat Mar 14, 2020 6:33 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: solubility product
Replies: 1
Views: 29

### solubility product

what are we supposed to do when we're asked to calculate the solubility product?
Sat Mar 14, 2020 5:45 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: h20 in our rate law
Replies: 3
Views: 84

### h20 in our rate law

given a dilute solution, with water as a reactant, would we include [H20] in the rate law?
Sat Mar 14, 2020 5:43 pm
Forum: *Enzyme Kinetics
Topic: catalysts
Replies: 4
Views: 85

### catalysts

In one of the homework questions, i believe 7.17, one of the main concepts was that a catalyst that only affects the rate of one step of the reaction , has no effect on the whole rate of the reaction, overall. is my takeaway correct?
Sat Mar 14, 2020 1:45 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: lnA
Replies: 3
Views: 32

### lnA

where exactly does lnA come from? I understand where all the other constants/variables come from, but not sure about this one.
Sat Mar 14, 2020 1:33 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation energy
Replies: 7
Views: 79

### Activation energy

what is the correct unit for Activation Energy?
Sat Mar 14, 2020 1:14 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius eqn.
Replies: 3
Views: 58

### arrhenius eqn.

for t1 and t2, should t1 always be the bigger temperature?
Sat Mar 14, 2020 12:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: pre-exponential factor
Replies: 2
Views: 21

### pre-exponential factor

So in the arrhenius equation, A is referred to as the pre-exponential factor; does anyone know *why* it's named that??
Sat Mar 14, 2020 12:51 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 4
Views: 52

### arrhenius equation

How would you summarize the purpose of the Arrhenius equation?
Sat Mar 14, 2020 9:07 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: pre-eq
Replies: 1
Views: 24

### pre-eq

What exactly makes pre-equilibrium the more "simple" method?
Sat Mar 14, 2020 9:07 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: diff b/w mechanisms?
Replies: 1
Views: 23

### diff b/w mechanisms?

can someone summarize the key differences b/w the steady-state eq and the pre-eq?
Sat Mar 14, 2020 9:04 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: intermediates
Replies: 8
Views: 112

### intermediates

where exactly do the intermediates (which cancel out) come from?
Sat Mar 14, 2020 9:03 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reaction mechanisms
Replies: 2
Views: 59

### reaction mechanisms

do we use steady-state or pre-eq in this class?
Sat Mar 14, 2020 7:16 am
Forum: First Order Reactions
Topic: 7B.1
Replies: 1
Views: 46

### 7B.1

The problem is: Beta blockers are drugs that are used to manage hypertension. It is important for doctors to know how rapidly a beta blocker is eliminated from the body. A certain beta blocker is eliminated in a rst-order process with a rate constant of 7.6 10 3 min 1 at normal body temperature (37 ...
Tue Mar 10, 2020 6:32 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: meaning of slow/fast mechanism
Replies: 3
Views: 62

### meaning of slow/fast mechanism

For example, what does the fast in "fast bimolecular dimerization" imply?
Tue Mar 10, 2020 6:30 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: slow/fast mechanism?
Replies: 1
Views: 37

### slow/fast mechanism?

how is the "speed" of a mechanism determined?
Tue Mar 10, 2020 4:20 pm
Forum: First Order Reactions
Topic: first order rate of consumption
Replies: 2
Views: 34

### first order rate of consumption

When using the equation for the rate of consumption of [A] in the first order, does [A] always need to be expressed as a concentration? Could we use mass instead in the formula and get the right answer?
Tue Mar 10, 2020 3:09 pm
Forum: First Order Reactions
Topic: determining Kr
Replies: 5
Views: 84

### determining Kr

When given a graph full of points of ln[A] vs t, all we need to do to find Kr is determine the slope? Do we use the typical slope equation (change in rise/run)?
Mon Mar 09, 2020 8:41 pm
Forum: General Rate Laws
Topic: 7A.3
Replies: 1
Views: 49

### 7A.3

Ethene is a component of natural gas, and its combustion has been thoroughly studied. At a certain temperature and pressure, the unique rate of the combustion reaction C2H4(g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g) is 0.44 mol/Ls (a) What is the rate at which oxygen reacts? (b) What is the rate of format...
Wed Feb 12, 2020 7:10 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Self-test 4I.4A
Replies: 1
Views: 29

### Self-test 4I.4A

How would we solve this problem? I'm not sure how to start here.

Confirm that liquid water and water vapor are in equilibrium when the
temperature is 100.C and the pressure is 1 atm. Data are available in Tables 4C.1 and 4G.1.
Wed Feb 12, 2020 1:18 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 4F.17
Replies: 1
Views: 55

### 4F.17

Could someone please post their scratchwork for this problem? I keep getting 2J/K for the entropy change. 4F.17 Calculate the standard entropy of vaporization of water at 85 C, given that its standard entropy of vaporization at 100 C is 109.0 J/Kmol and the molar heat capacities at constant pressure...
Tue Feb 11, 2020 12:32 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4D.5
Replies: 1
Views: 28

### 4D.5

For a certain reaction at constant pressure, deltaH = -15 kJ,
and 22 kJ of expansion work is done on the system by compressing
it into a smaller volume. What is deltaU for this process?

To get the answer, we assume that the value for work is -22; isn't work positive if it's being done on the system?
Mon Feb 10, 2020 8:47 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Self-test 4D.4A
Replies: 1
Views: 23

### Self-test 4D.4A

Gasoline, which contains octane, may burn to carbon monoxide if the air supply is restricted. Calculate the standard reaction enthalpy for the incomplete combustion of liquid octane to carbon monoxide gas and liquid water from the standard reaction enthalpies for the combustions of octane and carbon...
Mon Feb 10, 2020 12:59 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: EXAMPLE 4D.1 Determining a reaction enthalpy from experimental data
Replies: 1
Views: 46

### EXAMPLE 4D.1 Determining a reaction enthalpy from experimental data

Benzene is added to gasoline to increase the octane number. When 0.113 g of benzene, C6H6, burns in excess oxygen in a calibrated constant-pressure calorimeter with a heat capacity of 551 JC^-1, the temperature of the calorimeter rises by 8.60 C. Write the thermochemical equation for the reaction 2 ...
Mon Feb 03, 2020 2:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: endo vs exo
Replies: 8
Views: 43

### endo vs exo

For the breaking of a diatomic molecule's bond, what would the sign for delta H be? Why?
Mon Feb 03, 2020 2:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: sign of delta H
Replies: 2
Views: 31

### sign of delta H

If a reaction has more energy in its reactants, what will the sign of it's delta H be? How do we determine this?
Mon Feb 03, 2020 2:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: reversing signs
Replies: 5
Views: 48

### reversing signs

for calculating enthalpy change, when do you need to reverse the sign of delta H?
Mon Feb 03, 2020 2:20 pm
Forum: Calculating Work of Expansion
Topic: units
Replies: 9
Views: 80

### units

What are the units of w?
Mon Feb 03, 2020 2:19 pm
Forum: Calculating Work of Expansion
Topic: w=-P(deltaV) derivation
Replies: 3
Views: 36

### w=-P(deltaV) derivation

In order to derive the simplified formula, why do some of the intermediate steps have integrals? What do they represent in the context of the formula?
Mon Feb 03, 2020 2:17 pm
Forum: Calculating Work of Expansion
Topic: internal energy
Replies: 4
Views: 43

### internal energy

What exactly is the meaning of U being a state property?
Mon Feb 03, 2020 2:16 pm
Forum: Calculating Work of Expansion
Topic: formula derivation
Replies: 1
Views: 32

### formula derivation

can someone explain how we get from W=FD to W=P(deltaV)?
Mon Feb 03, 2020 2:15 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: examples of doing work
Replies: 2
Views: 20

### examples of doing work

What are some examples of a closed system doing work on its surroundings (as well as having work being done on it?)?
Mon Feb 03, 2020 2:14 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: changing energy of closed systems?
Replies: 1
Views: 30

### changing energy of closed systems?

is cooling a closed system equivalent to having the system do work on the surroundings?
Mon Feb 03, 2020 2:13 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed system energy change
Replies: 1
Views: 20

### closed system energy change

is doing work on a closed system the same as adding heat?
Mon Feb 03, 2020 2:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: changing energy of various systems?
Replies: 1
Views: 27

### changing energy of various systems?

is it possible to change the energy of an isolated system?
Mon Feb 03, 2020 2:09 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system example
Replies: 2
Views: 28

### isolated system example

What exactly is a bomb calorimeter? Why is it used as an example for an isolated system?
Mon Feb 03, 2020 2:08 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: question on lecture notes about closed system
Replies: 5
Views: 54

### question on lecture notes about closed system

For my notes under the definition of a closed system, I have (for the example specifically) "Ex: sealed beaker of water: Beaker does not insulate"
I'm confused as to what a lack of insulation has to do with it being a closed system? Or do I have the notes wrong? Thank you for your help!
Wed Jan 22, 2020 6:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: "shifting" eq?
Replies: 3
Views: 49

### "shifting" eq?

What does it mean when we say the eq is shifted to the right or left, in terms of K's values?
Wed Jan 22, 2020 6:32 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: chem module 1a question
Replies: 2
Views: 38

### chem module 1a question

Does K give us information about the relative concentrations of reactant and product?
Wed Jan 22, 2020 6:30 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: chem module 1a question
Replies: 2
Views: 30

### chem module 1a question

"If we make a reaction go faster, we can increase the amount of product at equilibrium" Is this true or false, and why?
Mon Jan 13, 2020 12:00 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: intermediate values of K
Replies: 3
Views: 21

### intermediate values of K

What are the parameters for K's intermediate values, ad what do they tell us?
Sun Jan 12, 2020 11:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: emitting solids and liquids
Replies: 2
Views: 21

### emitting solids and liquids

Why don't solids and liquids appear in the K expression?
Sun Jan 12, 2020 11:54 pm
Forum: Ideal Gases
Topic: pv = nRT purpose
Replies: 5
Views: 57

### pv = nRT purpose

When do we use this formula?
Sun Jan 12, 2020 11:51 pm
Forum: Ideal Gases
Topic: eq at the molecular level
Replies: 4
Views: 67

### eq at the molecular level

When a reaction's at equilibrium, does that mean the rate at which products and reactants are being formed are equal or merely constant?
Sun Jan 12, 2020 11:42 pm
Forum: Ideal Gases
Topic: equilibrium constant purpose
Replies: 7
Views: 64

### equilibrium constant purpose

What exactly does K tell us about a reaction?
Sun Dec 08, 2019 5:23 am
Forum: Calculating the pH of Salt Solutions
Topic: 6.13
Replies: 1
Views: 103

### 6.13

B(OH)3 is a very weak acid because it does not have a conjugate system to delocalize...
This was the answer posted to the question; I was just wondering what it meant by a conjugate system in this context?
Sun Dec 08, 2019 4:46 am
Forum: Calculating the pH of Salt Solutions
Topic: kbr?
Replies: 1
Views: 81

### kbr?

The answer key says KBr will be neutral, but the previous similar compounds, like KF aren't? Why is that?
Sun Dec 08, 2019 3:59 am
Forum: Polyprotic Acids & Bases
Topic: 6C.21 [ENDORSED]
Replies: 1
Views: 97

### 6C.21[ENDORSED]

Are we expected to know the formulas for these molecules?
Sun Dec 08, 2019 3:52 am
Forum: Polyprotic Acids & Bases
Topic: H2S and HCl
Replies: 2
Views: 99

### H2S and HCl

Why is HCl the stronger acid? Is there any other reason we should be aware of other than that its more electronegative?
Sun Dec 08, 2019 3:23 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: enthalpy?
Replies: 3
Views: 57

### enthalpy?

will we be tested on gibbs free energy and the related material? just wondering, because its in the section about acid and base strengths.
Sun Dec 08, 2019 2:22 am
Forum: Bronsted Acids & Bases
Topic: 6A.9 [ENDORSED]
Replies: 1
Views: 124

### 6A.9[ENDORSED]

For letter C, I can tell a change is occurring in the reaction, but can't exactly pinpoint which molecule is gaining what. How do we know a hydrogen hasn't been gained?
Sun Dec 08, 2019 1:48 am
Forum: Conjugate Acids & Bases
Topic: 6A.3
Replies: 2
Views: 113

### 6A.3

What are the chemical equations for the proton transfer equilibria supposed to look like ?
Sun Dec 08, 2019 12:17 am
Forum: Bronsted Acids & Bases
Topic: arrhenius bases
Replies: 1
Views: 99

### arrhenius bases

can someone provide an example of an arrhenius base in a reaction?
Sun Dec 08, 2019 12:03 am
Forum: Biological Examples
Topic: chelating ligands
Replies: 3
Views: 104

### chelating ligands

what are the differences between questions asking us about denticity and chelating? what are we supposed to answer specifically for each type?
Sat Dec 07, 2019 10:21 pm
Forum: Biological Examples
Topic: b12?
Replies: 3
Views: 159

### b12?

so b12 contains cobalt which helps with anemia and some mental illnesses; what makes it so useful, structure wise?
Sat Dec 07, 2019 9:30 pm
Forum: Biological Examples
Topic: memorizing examples
Replies: 3
Views: 39

### memorizing examples

are there specific biological compounds that we need to memorize?
Sat Dec 07, 2019 9:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: carbonato
Replies: 1
Views: 39

### carbonato

can someone explain why carbonato is bi/monodentate?
Sat Dec 07, 2019 9:27 pm
Forum: Biological Examples
Topic: chemotherapy drugs
Replies: 4
Views: 44

### chemotherapy drugs

how does chemotherapy's structure as a coordinate compound serve its effectiveness?
Sun Nov 24, 2019 11:03 pm
Forum: Dipole Moments
Topic: benzene polarity
Replies: 4
Views: 84

### benzene polarity

is benzene polar?
Sun Nov 24, 2019 10:50 pm
Forum: Bond Lengths & Energies
Topic: resonance bond length
Replies: 2
Views: 121

### resonance bond length

given a triple bond, a double bond, a single bond, and a double bond in a resonance structure, where would the resonance bond length lie in comparison to the others?
Sun Nov 24, 2019 10:45 pm
Forum: Hybridization
Topic: e geometry and hybridization
Replies: 2
Views: 40

### e geometry and hybridization

when determining the hybridization, the specific shape doesn't matter right? we only pay attention to the number of e density areas?
Sun Nov 24, 2019 10:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: resonance bond rules
Replies: 2
Views: 102

### resonance bond rules

in resonance structures, the same rules we would use to figure out the number of sigma and pi bonds still apply right?
Sun Nov 24, 2019 10:40 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: rotation in sigma bonds
Replies: 1
Views: 97

### rotation in sigma bonds

What exactly does it mean when they say the atoms rotate in sigma bonds?
Sun Nov 17, 2019 9:35 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: covalent vs hydrogen bond?
Replies: 2
Views: 26

### covalent vs hydrogen bond?

why are covalent bonds stronger?
Sun Nov 17, 2019 8:54 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: bp trend?
Replies: 2
Views: 23

### bp trend?

why does boiling point increase with atom size?
Sun Nov 17, 2019 8:42 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: potential energy formula
Replies: 1
Views: 20

### potential energy formula

can someone explain why a bigger negative PE value means a greater attraction, while a more positive PE number means a lesser attraction?
Sun Nov 17, 2019 8:21 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: np force?
Replies: 2
Views: 23

### np force?

what's the name of the force that acts on np molecules and monatomic gases again?
Sun Nov 03, 2019 7:54 pm
Forum: Electronegativity
Topic: memorizing tables
Replies: 9
Views: 90

### memorizing tables

For the electronegativity numbers, will we be given a table or be asked to memorize any?
Sun Nov 03, 2019 7:41 pm
Forum: Electronegativity
Topic: definitions
Replies: 8
Views: 129

### definitions

Could someone break down the difference between ionization energy and electron affinity?
Sun Nov 03, 2019 7:39 pm
Forum: Electronegativity
Topic: size
Replies: 8
Views: 84

### size

what is the general trend associated with atom size and electronegativity?
Sun Nov 03, 2019 7:36 pm
Forum: Coordinate Covalent Bonds
Topic: bond question
Replies: 5
Views: 185

### bond question

do coordinate covalent bonds form in nature? are they also more stable than regular bonds?
Sun Nov 03, 2019 7:06 pm
Forum: Lewis Acids & Bases
Topic: diff b/w lewis acid and base
Replies: 12
Views: 195

### diff b/w lewis acid and base

What classifies a molecule as a Lewis acid or base? Is it just dependent on who receives the e pair in the reaction?
Sun Oct 27, 2019 10:31 pm
Forum: Electronegativity
Topic: isoelectronic atoms
Replies: 2
Views: 56

### isoelectronic atoms

Do isoelectronic atoms have the same electronegativity, along with the same number of electrons? Or is it only the latter?
Sun Oct 27, 2019 10:22 pm
Forum: Octet Exceptions
Topic: Octet Guideline?
Replies: 2
Views: 34

### Octet Guideline?

Could someone explain the guideline from the notes (8 e- -> s2p6)?
Sun Oct 27, 2019 10:16 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy Unit
Replies: 6
Views: 68

### Ionization Energy Unit

Does anyone happen to have the unit for ionization energy?
Sun Oct 27, 2019 10:14 pm
Forum: Trends in The Periodic Table
Topic: Cations vs Parent atoms
Replies: 4
Views: 51

### Cations vs Parent atoms

Could someone explain why cations are smaller than their parent atoms?
Sun Oct 27, 2019 4:59 pm
Forum: Quantum Numbers and The H-Atom
Topic: determining the number of orbitals
Replies: 7
Views: 112

### determining the number of orbitals

Using given quantum numbers, what's the formula for determining the number of orbitals in a subshell? thank you!
Sun Oct 20, 2019 11:26 pm
Forum: DeBroglie Equation
Topic: 1B.19 Help
Replies: 3
Views: 64

### 1B.19 Help

Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling.....

I've been using DeBroglie's eqn. for this, but I'm not getting the right answer? Could someone post their work? thank you!
Sun Oct 20, 2019 11:11 pm
Forum: Einstein Equation
Topic: 1B.15 help w/ part c
Replies: 2
Views: 138

### 1B.15 help w/ part c

I was just wondering why we had to use that kinetic energy formula instead of being able to convert using the simple einstein equation. What am I missing here?
Sun Oct 20, 2019 10:58 pm
Forum: Einstein Equation
Topic: energy emitted by H electrons
Replies: 5
Views: 111

### energy emitted by H electrons

So we were given the E = -hR/n^2 formula which, if i'm not wrong, can be used to give us the energy emitted by a transitioning electron. Is this formula only for electrons in a Hydrogen atom?
Sun Oct 20, 2019 9:35 pm
Forum: Einstein Equation
Topic: Alternative unit for J
Replies: 4
Views: 66

### Alternative unit for J

How can Joules be written in terms of kg, m, and s? thank you!
Sun Oct 20, 2019 8:39 pm
Forum: Einstein Equation
Topic: 1B.9 help
Replies: 4
Views: 69

### 1B.9 help

A lamp rated at 32 W emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

What formula would we use for this? (this is probably in the wrong forum) Thank you!
Sun Oct 13, 2019 9:05 pm
Forum: Properties of Light
Topic: Relationship b/w wavelength and E
Replies: 5
Views: 79

### Relationship b/w wavelength and E

Is Energy directly or indirectly proportional to wavelength?
Sun Oct 13, 2019 8:59 pm
Forum: Properties of Electrons
Topic: Intensity vs. Energy
Replies: 10
Views: 125

### Intensity vs. Energy

What's the difference between the two concepts in terms of the photoelectric experiment?
Sun Oct 13, 2019 8:56 pm
Forum: Properties of Light
Topic: Baler v. Lyman Series
Replies: 10
Views: 163

### Baler v. Lyman Series

What are the differences between the two?
Sun Oct 13, 2019 8:51 pm
Forum: Properties of Electrons
Topic: electron size
Replies: 3
Views: 36

### electron size

Were we given the size of an electron?
Wed Oct 09, 2019 2:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Self-test L.3A
Replies: 1
Views: 86

### Self-test L.3A

Could someone write out the steps to solving this problem? Self-test L.3A: A student used a sample of hydrochloric acid that was known to contain 0.020 mol HCl in 500.0 mL of solution to titrate 25.0 mL of a solution of calcium hydroxide.The stoichiometric point was reached when 15.1 mL of acid had ...
Sun Oct 06, 2019 9:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: HW problem G5
Replies: 3
Views: 127

### HW problem G5

n = cv is the equation we eventually use to solve for the answer right?
Sun Oct 06, 2019 3:49 am
Forum: Molarity, Solutions, Dilutions
Topic: m = cMV Formula
Replies: 1
Views: 125

### m = cMV Formula

I've become pretty familiar with the n = cv formula (explained on page F55), but I'm still a little confused as to when we would use the m = cMV. Could someone explain its use a bit further? thank you!
Sun Oct 06, 2019 3:46 am
Forum: Molarity, Solutions, Dilutions
Topic: Preparing solutions
Replies: 1
Views: 55

### Preparing solutions

Is there a difference in the procedure for preparing stock solutions as compared to regular solutions?
Sat Oct 05, 2019 11:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: Symbols for Molarity
Replies: 8
Views: 215

### Symbols for Molarity

This is a silly/obvious question, but when referring to molarity, or concentration in general, the book uses "c" or "M" interchangeably right? (just wanted to be sure that there's no difference in meaning for the two symbols. thank you!)
Sun Sep 29, 2019 5:36 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Metric Conversions
Replies: 8
Views: 205

### Memorizing Metric Conversions

hello! i was just wondering if anyone had any helpful tricks for memorizing the metric conversions (from pico to Tera)? thank you!!!