Search found 103 matches

by Samuel Tzeng 1B
Fri Mar 13, 2020 10:08 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step Determination
Replies: 5
Views: 100

Re: Slow Step Determination

I'm pretty sure it should be given
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:08 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Identification
Replies: 4
Views: 113

Re: Identification

I think you just have to know if it's pure or not
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:06 pm
Forum: Administrative Questions and Class Announcements
Topic: take home FINAL DEADLINE
Replies: 15
Views: 353

Re: take home FINAL DEADLINE

He hasn't explicitly stated when we need to submit the final yet
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:04 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 5
Views: 59

Re: Catalysts

It means the catalyst is not consumed during the reaction
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:03 pm
Forum: General Rate Laws
Topic: Temperature and kinetics
Replies: 5
Views: 103

Re: Temperature and kinetics

Yes at higher temperatures, molecules have higher kinetic energy
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:02 pm
Forum: First Order Reactions
Topic: Units for t
Replies: 13
Views: 148

Re: Units for t

The SI units for time is seconds
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:01 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Delta S total
Replies: 3
Views: 96

Re: Delta S total

The total entropy is the entropy of the surroundings plus the entropy of the system
by Samuel Tzeng 1B
Fri Mar 13, 2020 10:00 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 3
Views: 50

Re: Catalysts

I think different types of catalysts use different methods to lower the activation energy
by Samuel Tzeng 1B
Fri Mar 13, 2020 9:58 pm
Forum: Zero Order Reactions
Topic: Catalyst
Replies: 4
Views: 121

Re: Catalyst

No a zero order reaction won't be influenced by a catalyst
by Samuel Tzeng 1B
Fri Mar 13, 2020 9:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6.45
Replies: 3
Views: 53

Re: 6.45

The reduction table in the back of the book shows you which metals will be reduced
by Samuel Tzeng 1B
Fri Mar 13, 2020 9:54 pm
Forum: General Rate Laws
Topic: Instantaneous Rate
Replies: 2
Views: 52

Re: Instantaneous Rate

The instantaneous rate is the rate at any given time, the rate is given by the tangent line at that time
by Samuel Tzeng 1B
Fri Mar 13, 2020 9:52 pm
Forum: Balancing Redox Reactions
Topic: Oxidation number
Replies: 12
Views: 269

Re: Oxidation number

The oxidation number change in a chemical reaction show what is being reduced and oxidized
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:41 pm
Forum: First Order Reactions
Topic: rate constants
Replies: 19
Views: 323

Re: rate constants

the rate constant is always positive
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:39 pm
Forum: General Rate Laws
Topic: Rate limiting step
Replies: 13
Views: 162

Re: Rate limiting step

it's the slowest step in a reaction
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: finding k
Replies: 3
Views: 43

Re: finding k

You'll likely need to be given the rate law or experimental data
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Change in Ecell
Replies: 5
Views: 78

Re: Change in Ecell

Increasing the size of the metal does not change the cell potential
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:36 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: dilutions and Ecell
Replies: 8
Views: 152

Re: dilutions and Ecell

If it's a cathode solution (like on test 2) then diluting it will decrease cell potential
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:34 pm
Forum: *Enzyme Kinetics
Topic: Do we need to know enzyme kinetics for the final? [ENDORSED]
Replies: 4
Views: 447

Re: Do we need to know enzyme kinetics for the final? [ENDORSED]

You should know that enzymes can act as catalysts
by Samuel Tzeng 1B
Wed Mar 11, 2020 4:32 pm
Forum: General Rate Laws
Topic: 7A.3
Replies: 5
Views: 100

Re: 7A.3

0.44 is not the rate constant but the actual rate so you would multiply the number of oxygen's by 0.44
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:50 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: purpose
Replies: 4
Views: 77

Re: purpose

It relates the rate constant k to activation energy Ae and temperature T
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:47 pm
Forum: General Rate Laws
Topic: overall order
Replies: 5
Views: 50

Re: overall order

You'll have to find the order of the individual reactants then add them up
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:46 pm
Forum: Second Order Reactions
Topic: linear graph
Replies: 7
Views: 162

Re: linear graph

1/[A] vs time
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:45 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Slow Step
Replies: 4
Views: 46

Re: Slow Step

You will most likely not need to determine which step is the slow step
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:45 pm
Forum: General Science Questions
Topic: Test 2 Grades [ENDORSED]
Replies: 23
Views: 601

Re: Test 2 Grades [ENDORSED]

Probably during dicussion
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:44 pm
Forum: General Rate Laws
Topic: 7A3
Replies: 2
Views: 65

Re: 7A3

Since the equation has 3 moles of O2 on the reactant side, the rate at which oxygen reacts will be 3 times the rate of reaction
Similarly, since the equation has 2moles of H2O on the product side, the rate at which water forms will be 2 times the rate of reaction
by Samuel Tzeng 1B
Mon Mar 09, 2020 3:42 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: k'
Replies: 6
Views: 85

Re: k'

it is the rate constant of the reverse reaction
by Samuel Tzeng 1B
Mon Feb 10, 2020 4:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal
Replies: 9
Views: 90

Re: Isothermal

Isothermal systems have constant temperature, this does not mean the same as reversible
by Samuel Tzeng 1B
Mon Feb 10, 2020 4:52 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneity
Replies: 18
Views: 171

Re: spontaneity

if delta G is negative the reaction is spontaneous
by Samuel Tzeng 1B
Mon Feb 10, 2020 4:49 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous delta G
Replies: 7
Views: 69

Re: Spontaneous delta G

finding the temperature at delta G=0 gives the minimum temperature for the reaction to be spontaneous
by Samuel Tzeng 1B
Mon Feb 10, 2020 4:41 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: qp=deltaH
Replies: 6
Views: 85

Re: qp=deltaH

q = deltaH at constant pressure
by Samuel Tzeng 1B
Mon Feb 10, 2020 4:40 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q=mCdeltaT vs q=nCdeltaT
Replies: 2
Views: 36

Re: q=mCdeltaT vs q=nCdeltaT

use q=mCdeltaT when you're given the mass and use q=nCdeltaT when you're given the moles
by Samuel Tzeng 1B
Sun Feb 02, 2020 8:33 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Positive or negative work?
Replies: 8
Views: 87

Re: Positive or negative work?

If work is done on the system it is positive, if the system is doing work its surroundings work is negative
by Samuel Tzeng 1B
Sun Feb 02, 2020 8:31 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 12
Views: 173

Re: PV=nRT

P is pressure, V is volume, n is # of moles of gas, R is the gas constant, T is temperature
by Samuel Tzeng 1B
Sun Feb 02, 2020 8:28 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Pressure in an open beaker
Replies: 12
Views: 108

Re: Pressure in an open beaker

Pressure in an open beaker is always constant since there isn't a volume to drop or increase pressure
by Samuel Tzeng 1B
Sun Feb 02, 2020 8:28 pm
Forum: General Science Questions
Topic: Extra Credit
Replies: 19
Views: 293

Re: Extra Credit

I don't think so.
by Samuel Tzeng 1B
Mon Jan 27, 2020 3:08 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic reaction
Replies: 18
Views: 267

Re: Exothermic reaction

if temp increases then the reaction will shift to the left, if temp decreases then the reaction will shift to the right
by Samuel Tzeng 1B
Mon Jan 27, 2020 3:07 am
Forum: Administrative Questions and Class Announcements
Topic: Grading of Tests
Replies: 18
Views: 245

Re: Grading of Tests

I believe they'll give partial credit if you use the right steps
by Samuel Tzeng 1B
Mon Jan 27, 2020 3:06 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa to Kb
Replies: 12
Views: 145

Re: pKa to Kb

pKa + pKb = 14, then use pKb to solve for Kb
by Samuel Tzeng 1B
Mon Jan 27, 2020 3:05 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Shifts Left or Right
Replies: 15
Views: 176

Re: Reaction Shifts Left or Right

the reaction will shift left
by Samuel Tzeng 1B
Mon Jan 27, 2020 3:04 am
Forum: Administrative Questions and Class Announcements
Topic: homework for week 4
Replies: 11
Views: 129

Re: homework for week 4

I'm pretty sure the thermodynamics section
by Samuel Tzeng 1B
Sun Jan 19, 2020 9:12 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa
Replies: 13
Views: 91

Re: pKa

A stronger acid will have a lower pKa
by Samuel Tzeng 1B
Sun Jan 19, 2020 9:12 pm
Forum: General Science Questions
Topic: test 1
Replies: 8
Views: 101

Re: test 1

The test is during your discussion session on week 3
by Samuel Tzeng 1B
Sun Jan 19, 2020 9:09 pm
Forum: General Science Questions
Topic: Acids
Replies: 3
Views: 54

Re: Acids

Lewis acids are proton acceptors while Bronsted acids are proton donors
by Samuel Tzeng 1B
Sun Jan 19, 2020 9:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 7
Views: 58

Re: Le Chatelier's Principle

It helps us predict how a reaction will react when a physical change occurs
by Samuel Tzeng 1B
Sun Jan 12, 2020 9:18 pm
Forum: Ideal Gases
Topic: P=(n/v)RT
Replies: 12
Views: 136

Re: P=(n/v)RT

Writing (n/V)RT is the same as nRT/V
by Samuel Tzeng 1B
Sun Jan 12, 2020 9:16 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q>K
Replies: 9
Views: 82

Re: Q>K

If the ratio of products to reactants is larger than that of the equilibrium constant, then Q>K
by Samuel Tzeng 1B
Sun Jan 12, 2020 9:09 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating Q
Replies: 16
Views: 226

Re: Calculating Q

Since the activity of solids and liquids are equal to 1, they aren't included in the calculation of Q and K, this leaves only gases and aqueous substances
by Samuel Tzeng 1B
Sun Jan 12, 2020 9:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration
Replies: 5
Views: 36

Re: Concentration

If all other conditions remain the same, the equilibrium constant won't change
by Samuel Tzeng 1B
Sun Jan 12, 2020 9:02 pm
Forum: Ideal Gases
Topic: ICE Table
Replies: 9
Views: 108

Re: ICE Table

If the forward reaction is favored, then reactants will have a negative change and products will have a negative change, and vice versa when the reverse reaction is favored
by Samuel Tzeng 1B
Sun Dec 08, 2019 6:49 pm
Forum: Naming
Topic: Chelating
Replies: 3
Views: 149

Re: Chelating

If it has the structure binding site-spacer-spacer-binding site then it is typically chelating
by Samuel Tzeng 1B
Sun Dec 08, 2019 6:47 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 14
Views: 512

Re: Octet exception

Elements with the third energy shell and on since the d-orbital can also have electrons
by Samuel Tzeng 1B
Sun Dec 08, 2019 6:45 pm
Forum: Naming
Topic: -ate
Replies: 11
Views: 286

Re: -ate

You don't need to add anything for positive ions or neutral molecules
by Samuel Tzeng 1B
Sun Dec 08, 2019 6:44 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic
Replies: 7
Views: 193

Re: Amphiprotic

they can act as both an acid and a base
by Samuel Tzeng 1B
Sun Dec 08, 2019 6:44 pm
Forum: Hybridization
Topic: double and triple bonds
Replies: 6
Views: 255

Re: double and triple bonds

pi bonds in double and triple bonds don't hybridize
by Samuel Tzeng 1B
Sun Dec 01, 2019 6:22 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: 6C.19
Replies: 1
Views: 38

Re: 6C.19

HNO3 is stronger since it’s conjugate base NO3- is more stable than the conjugate base of HNO2
by Samuel Tzeng 1B
Sun Dec 01, 2019 6:19 pm
Forum: Bronsted Acids & Bases
Topic: Conjugate acids and bases
Replies: 5
Views: 110

Re: Conjugate acids and bases

Conjugate acids are bronsted bases with an H+
Conjugate vases are bronsted acids without an H+
by Samuel Tzeng 1B
Sun Dec 01, 2019 6:12 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Drawing sigma & Pi bonds
Replies: 7
Views: 214

Re: Drawing sigma & Pi bonds

You can represent end to end by drawing 2 infinity signs next to each other and represent side to side by drawing two 8’s next to each other
by Samuel Tzeng 1B
Sun Dec 01, 2019 6:05 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH calcuations
Replies: 8
Views: 107

Re: pH calcuations

I believe so
by Samuel Tzeng 1B
Sun Dec 01, 2019 6:03 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: H2SO4
Replies: 2
Views: 42

Re: H2SO4

Yes the concentration of H+ would be double that of H2SO4
by Samuel Tzeng 1B
Sun Nov 24, 2019 3:50 pm
Forum: Naming
Topic: Order
Replies: 4
Views: 75

Re: Order

The transition metal cation comes before the anion
by Samuel Tzeng 1B
Sun Nov 24, 2019 3:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Focus 9C.1 and 9C.2
Replies: 2
Views: 63

Re: Focus 9C.1 and 9C.2

9C.1: Coordination Complexes
9C.2: The Shapes of Complexes
by Samuel Tzeng 1B
Fri Nov 22, 2019 1:12 am
Forum: Determining Molecular Shape (VSEPR)
Topic: name?
Replies: 4
Views: 60

Re: name?

chrisleung wrote:Yes, they are two names for the same geometry, for molecules with configuration AX2E or AX3E


AX3E would be trigonal pyramidal, AX2E2 would be bent
by Samuel Tzeng 1B
Fri Nov 22, 2019 1:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: NO Shape and Polarity
Replies: 4
Views: 81

Re: NO Shape and Polarity

NO is linear, I think it's slightly polar
by Samuel Tzeng 1B
Mon Nov 18, 2019 12:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: pentagonal bipyramidal 3 lone pairs?
Replies: 2
Views: 45

Re: pentagonal bipyramidal 3 lone pairs?

I don't think we would need to know this as it's either super uncommon or not possible
by Samuel Tzeng 1B
Mon Nov 18, 2019 12:31 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: NH2OH
Replies: 1
Views: 28

Re: NH2OH

it would be between the oxygen atoms of one molecule and the hydrogen of another
by Samuel Tzeng 1B
Mon Nov 18, 2019 12:28 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: CH2Cl2
Replies: 1
Views: 38

Re: CH2Cl2

since the C-H bonds and C-Cl bonds have differing polarities, the molecule will be polar and will have dipole-dipole interactions
by Samuel Tzeng 1B
Mon Nov 18, 2019 12:26 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: H2SeO4
Replies: 1
Views: 47

Re: H2SeO4

the dipole between O-H bonds will cause the H to be slightly negative, while the dipole between the Se-O bonds will make the O slightly positive, this causes the H atoms of one molecule to be attracted to the O atoms of another, creating dipole-dipole interactions
by Samuel Tzeng 1B
Mon Nov 18, 2019 12:21 am
Forum: Dipole Moments
Topic: Intermolecular Forces
Replies: 1
Views: 39

Re: Intermolecular Forces

London, Dipole-dipole, dipole-induced dipole, ion-dipole, h-bondings, ion-induced dipole
by Samuel Tzeng 1B
Sun Nov 10, 2019 6:47 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: dipole moment and intermolecular forces
Replies: 3
Views: 79

Re: dipole moment and intermolecular forces

Dipole moments cause parts of a molecule to be charged, this leads to positively charged parts of one molecule being attracted to negatively charged parts of another, leading to intermolecular forces.
by Samuel Tzeng 1B
Sun Nov 10, 2019 6:44 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F.3 hw prob
Replies: 1
Views: 27

Re: 3F.3 hw prob

CH4 and CCl4 won't have dipole-dipole interactions since they don't have permanent dipole moments
by Samuel Tzeng 1B
Sun Nov 10, 2019 6:41 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 3
Views: 44

Re: Dipole Moments

dipole moments occur when electrons are unequally shared, this can affect intermolecular forces as it makes parts of the molecule positively/negatively charged
by Samuel Tzeng 1B
Sun Nov 10, 2019 6:39 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F.1 hw prob
Replies: 1
Views: 18

Re: 3F.1 hw prob

Look at the difference in electronegativity between atoms and look for cases of hydrogen bonding
by Samuel Tzeng 1B
Sat Nov 02, 2019 6:59 pm
Forum: Lewis Structures
Topic: 2B. 9
Replies: 3
Views: 47

Re: 2B. 9

It shows that they're bonded through ionic bonds rather than covalent bonds
by Samuel Tzeng 1B
Sat Nov 02, 2019 6:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.3
Replies: 1
Views: 40

Re: 2A.3

a) [Ar]
b) [Ar]3d^10 4s^2
c) [Kr]4d^5
d) [Ar]3d^10 4s^2
by Samuel Tzeng 1B
Sat Nov 02, 2019 6:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.5
Replies: 1
Views: 45

Re: 2A.5

a) [Ar]3d^10
b) [Xe]4f^14 5d^10 6s^2
c) [Ar]3d^10;
d) [Xe]4f^14 5d^10
by Samuel Tzeng 1B
Sat Nov 02, 2019 6:52 pm
Forum: Resonance Structures
Topic: Textbook question 2B.15
Replies: 1
Views: 46

Re: Textbook question 2B.15

N can't be double bonded to Cl since Cl is a halogen and halogens don't form double bonds
by Samuel Tzeng 1B
Sat Nov 02, 2019 6:48 pm
Forum: Lewis Structures
Topic: 2B. 3 part d
Replies: 4
Views: 45

Re: 2B. 3 part d

Br has three bonds (one with each F) and two pairs of lone electrons, while the F's have 3 pairs of lone electrons
by Samuel Tzeng 1B
Sun Oct 27, 2019 9:33 pm
Forum: Lewis Structures
Topic: VSEPR: E in AXE
Replies: 2
Views: 29

Re: VSEPR: E in AXE

E represents lone pairs on the central atom
by Samuel Tzeng 1B
Sun Oct 27, 2019 9:31 pm
Forum: Sigma & Pi Bonds
Topic: Single vs. Double bonds
Replies: 15
Views: 274

Re: Single vs. Double bonds

Since double bonds are stronger, they pull the atoms closer together and are therefore shorter.
by Samuel Tzeng 1B
Sun Oct 27, 2019 9:29 pm
Forum: Lewis Structures
Topic: 2C.7
Replies: 2
Views: 38

Re: 2C.7

a.2 bonding pairs, 2 lone pairs
b.2 bonding pairs, 4 lone pairs
c.3 bonding pairs, 2 lone pairs
d.5 bonding pairs, 1 lone pair
by Samuel Tzeng 1B
Sun Oct 27, 2019 9:25 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.23
Replies: 2
Views: 52

Re: 2A.23

a.Mg3As2
b.In2S3
c.AlH3
d.H2Te
e.BiF3
by Samuel Tzeng 1B
Sun Oct 27, 2019 9:21 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.21
Replies: 4
Views: 80

Re: 2A.21

a.[Ar]
b.[Kr]5s^2 4d^10
c.[Xe]
d.[Ar]3d^8

no unpaired electrons for all
by Samuel Tzeng 1B
Sat Oct 19, 2019 9:31 pm
Forum: Photoelectric Effect
Topic: E = pc vs E= mv^2/2
Replies: 2
Views: 44

Re: E = pc vs E= mv^2/2

E=pc=mc^2 only applies to em radiation

E=mv^2/2 is used for kinetic energy of an object
by Samuel Tzeng 1B
Sat Oct 19, 2019 7:53 pm
Forum: Properties of Electrons
Topic: Electron structures
Replies: 4
Views: 95

Re: Electron structures

Electrons are paired if they're in the same orbital and parallel if they're in separate orbitals and have the same spin
by Samuel Tzeng 1B
Sat Oct 19, 2019 3:00 pm
Forum: DeBroglie Equation
Topic: 1B. 19 Homework Help
Replies: 1
Views: 40

Re: 1B. 19 Homework Help

I used the ones from the chem website

Mass of neutron = 1.674 927 × 10^−27 kg

Mass of proton = 1.672 622 × 10^−27 kg
by Samuel Tzeng 1B
Sat Oct 19, 2019 2:58 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 263

Re: Midterm

6 – 8pm, Wednesday November 6
by Samuel Tzeng 1B
Sat Oct 19, 2019 2:55 pm
Forum: Einstein Equation
Topic: Focus 1B.5 Homework.. Electron Volts
Replies: 2
Views: 71

Re: Focus 1B.5 Homework.. Electron Volts

1 eV = 1.602 × 10^-19 J
by Samuel Tzeng 1B
Sat Oct 12, 2019 3:47 pm
Forum: DeBroglie Equation
Topic: Wave Properties of Electrons and the De Broglie Equation Post-Module Assessment
Replies: 1
Views: 28

Re: Wave Properties of Electrons and the De Broglie Equation Post-Module Assessment

wavelength = h/(mv)

if wavelength is shorter than 10^-15m it is undetectable
by Samuel Tzeng 1B
Sat Oct 12, 2019 3:40 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 4
Views: 74

Re: Wavelength

since the speed of light is always the same c = 3.0*10^8 and c=wavelength * frequency, as wavelength decreases frequency must increase and the same idea applies to energy since frequency and energy are directly related
by Samuel Tzeng 1B
Sat Oct 12, 2019 3:29 pm
Forum: Properties of Light
Topic: Homework B9
Replies: 1
Views: 44

Re: Homework B9

find number of joules from the light
32J/s * 2.0s = 64J

then divide joules by the energy per photon
64J/(4.7*10^-19) = 1.4*10^20

finally divide by Avogadro's #

1.4*10^20/(6.022*10^23) = 2.3*10^-4 mol photon
by Samuel Tzeng 1B
Sat Oct 12, 2019 3:19 pm
Forum: Properties of Electrons
Topic: Speed of an Electron
Replies: 3
Views: 91

Re: Speed of an Electron

I think it's reasonable as long as it's lower than the speed of light
by Samuel Tzeng 1B
Sat Oct 12, 2019 3:16 pm
Forum: Properties of Light
Topic: Textbook 1B.15
Replies: 1
Views: 36

Re: Textbook 1B.15

E(photon)=1.66*10^-17+KE(electron)= 1.66*10^-17J + 0.5 * (9.11*10^-31kg) * (3.6*10^6m/s)^2 = 2.25*10^-17J

then you can use the energy of the photon to find the wavelength using E=hv
by Samuel Tzeng 1B
Sun Oct 06, 2019 1:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: Preparing solutions
Replies: 1
Views: 56

Re: Preparing solutions

I don't think so
by Samuel Tzeng 1B
Thu Oct 03, 2019 4:59 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Lab experiments- accuracy vs precision
Replies: 7
Views: 155

Re: Lab experiments- accuracy vs precision

If your experiment is inaccurate yet precise it may indicate that there is a problem with the devices/methods you are using to conduct your experiment
by Samuel Tzeng 1B
Thu Oct 03, 2019 4:57 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.17
Replies: 6
Views: 138

Re: Fundamentals M.17

Darren Nguyen 1F wrote:
Samuel Tzeng 1H wrote:Molar mass of XA = total mass - mass of H2O


How do I get total mass?


It's the molar mass of HA + XOH = (250+125)

Sorry I meant total molar mass - molar mass of H2O
by Samuel Tzeng 1B
Thu Oct 03, 2019 4:53 pm
Forum: Balancing Chemical Reactions
Topic: Fundamentals L39
Replies: 2
Views: 101

Re: Fundamentals L39

Start off by finding moles of tin and oxygen

Sn: 1.50g Sn / 118.71g/mol = .01264 mol Sn
O: (28.35g - 26.45g - 1.50g) / 16.00g/mol = 0.025 mol O

With this you can tell the empirical formula is SnO2

The oxide would be Tin(IV) Oxide since each oxygen has a -2 charge so the tin must have a +4 charge

Go to advanced search