Search found 99 matches

by AlyssaBei_1F
Mon Mar 11, 2019 8:45 am
Forum: Administrative Questions and Class Announcements
Topic: Homework week 9
Replies: 3
Views: 72

Re: Homework week 9

No I believe we just turn in 7 problems this week.
by AlyssaBei_1F
Mon Mar 11, 2019 8:37 am
Forum: Zero Order Reactions
Topic: Graphs
Replies: 6
Views: 142

Graphs

Do we need to know what the graphs will look like for zero, first, and second order reactions?
by AlyssaBei_1F
Mon Mar 11, 2019 8:34 am
Forum: Second Order Reactions
Topic: Second Order Reaction Graphs
Replies: 1
Views: 27

Second Order Reaction Graphs

Will the graph of a second order reaction always be a straight line with a negative slope?
by AlyssaBei_1F
Mon Mar 11, 2019 8:32 am
Forum: Zero Order Reactions
Topic: Zero Order Units
Replies: 3
Views: 44

Re: Zero Order Units

In the 7th edition, 7a problem #7 lays it out. The units for zero order are (mol A)/L/s. The units for first order are s^-1. The units for second order are L/(mol A)/s.
by AlyssaBei_1F
Mon Mar 04, 2019 12:29 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation energy
Replies: 8
Views: 155

Re: Activation energy

Activation energy is the energy needed for the reaction to occur. It is also known as Ea. The less activation energy needed the more favorable the process/reaction is.
by AlyssaBei_1F
Mon Mar 04, 2019 12:26 pm
Forum: General Rate Laws
Topic: Derivatives
Replies: 5
Views: 92

Derivatives

In lecture today, many equations involved integrals and derivatives. Do we need to know how to solve with integrals and derivatives for the kinetics section?
by AlyssaBei_1F
Mon Mar 04, 2019 12:24 pm
Forum: First Order Reactions
Topic: First Order Reactions
Replies: 6
Views: 71

First Order Reactions

In first order reactions, will it always be a straight line like the graph in lecture from today?
by AlyssaBei_1F
Mon Mar 04, 2019 12:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt
Replies: 14
Views: 208

Re: Pt

You add Pt(s) when there is not a solid on either the anode or cathode side. Sometimes it will tell you what kind of solid to add in the problem.
by AlyssaBei_1F
Mon Mar 04, 2019 12:20 pm
Forum: Balancing Redox Reactions
Topic: Cell diagrams
Replies: 8
Views: 130

Re: Cell diagrams

If the anode or cathode does not include a solid, you add Pt(s) to whatever side does not have a solid. The aqueous solutions always go near the line (I). For example Pt(s) I Na (aq) II cathode.
by AlyssaBei_1F
Mon Feb 25, 2019 4:20 pm
Forum: Balancing Redox Reactions
Topic: Friday Lecture Example [ENDORSED]
Replies: 2
Views: 67

Friday Lecture Example [ENDORSED]

In Friday's lecture, the answer to his example was Cu(s) I Cu^2+(aq) II Fe^3+ (aq), Fe^2+(aq) II Pt(s). Why is the Pt(s) added?
by AlyssaBei_1F
Mon Feb 25, 2019 2:22 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Order in Cell Diagrams
Replies: 2
Views: 45

Re: Order in Cell Diagrams

Oxidation (from reactants), oxidation (from products) II reduction (from reactants), reduction (from products).
Separate with comma for same states
Sperate with I when different states
by AlyssaBei_1F
Mon Feb 25, 2019 2:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Voltage
Replies: 1
Views: 27

Voltage

Is voltage always positive?
by AlyssaBei_1F
Mon Feb 25, 2019 2:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 2
Views: 33

Re: Cell Diagrams

Cu(s) and Cu2+(aq) is separated by a I because it is two different states. Fe3+(aq) and Fe2+(aq) is separated by a comma because they are the same state.
by AlyssaBei_1F
Mon Feb 18, 2019 5:48 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 4
Views: 68

Van't Hoff Equation

In the Van't Hoff equation, is the 2 R's in the equation both Boltemann's constant?
by AlyssaBei_1F
Mon Feb 18, 2019 5:46 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G
Replies: 4
Views: 63

Re: Delta G

The çhange in G is not dependent on path taken so it would not be a state function.
by AlyssaBei_1F
Mon Feb 18, 2019 5:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 4
Views: 60

Gibbs Free Energy

G=-RTlnK, in this equation does K represent the confrontation of products over reactants?
by AlyssaBei_1F
Mon Feb 18, 2019 5:43 pm
Forum: Van't Hoff Equation
Topic: vant hoff
Replies: 2
Views: 52

Re: vant hoff

You need a constant pressure. The Van't Hoff equation can be used to calculate K @ different temperature if delta H is known.
by AlyssaBei_1F
Mon Feb 18, 2019 5:40 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 3
Views: 52

Re: Entropy

Gases have the highest entropy value because the molecules have the greatest freedom of movement. Entropy of solid<Entropy of liquid<entropy of gas
by AlyssaBei_1F
Mon Feb 11, 2019 10:35 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta H
Replies: 3
Views: 57

Delta H

When does delta H replace q in delta u=q+w?
by AlyssaBei_1F
Mon Feb 11, 2019 10:34 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Expansion
Replies: 2
Views: 48

Re: Reversible Expansion

R (constant) is in Kelvin, so it would be more efficient to use K.
by AlyssaBei_1F
Mon Feb 11, 2019 10:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Expansion
Replies: 2
Views: 48

Re: Reversible Expansion

R (constant) is in Kelvin, so it would be more efficient to use K.
by AlyssaBei_1F
Mon Feb 11, 2019 10:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Microstates
Replies: 7
Views: 196

Re: Microstates

micro states to the power of molecules are W in the equation s=kblnW
by AlyssaBei_1F
Mon Feb 11, 2019 2:44 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Signs for entropy
Replies: 5
Views: 92

Signs for entropy

When do you use -delta H/T versus +delta H/T?
by AlyssaBei_1F
Mon Feb 04, 2019 9:51 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open vs Closed Systems
Replies: 4
Views: 68

Open vs Closed Systems

I get confused on identifying open vs closed systems. Can someone give me examples of each and how they go about differentiation one vs the other?
by AlyssaBei_1F
Mon Feb 04, 2019 9:49 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpy
Replies: 2
Views: 38

Bond Enthalpy

Will the Lewis Structure be given for a problem with bond enthalpy on a test?
by AlyssaBei_1F
Mon Feb 04, 2019 9:46 am
Forum: Phase Changes & Related Calculations
Topic: Heat and Condensation
Replies: 9
Views: 112

Re: Heat and Condensation

Condensation releases heat because you are going from a gas to liquid state. In a gas molecules are moving rapidly, so in order to slow the particles you need to release heat to turn them into a liquid.
by AlyssaBei_1F
Mon Feb 04, 2019 9:43 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 6
Views: 96

Re: Work

I think of work like exothermic and endothermic. Doing work on a system is positive because you are adding energy. Work by a system is negative because energy is released.
by AlyssaBei_1F
Mon Jan 28, 2019 10:00 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 2
Views: 56

Bond Enthalpies

In lecture on Friday, Dr. Lavelle said bond enthalpies of diatomic molecules are accurate, but all others are averages of many different molecules. Can someone give me an example of what he means?
by AlyssaBei_1F
Mon Jan 28, 2019 9:56 am
Forum: Phase Changes & Related Calculations
Topic: Enthalpy and state property
Replies: 2
Views: 46

Enthalpy and state property

Can someone explain how enthalpy is a state property?
by AlyssaBei_1F
Mon Jan 28, 2019 9:55 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Exothermic vs. Endothermic
Replies: 10
Views: 135

Re: Exothermic vs. Endothermic

Endothermic has a positive delta G and exothermic has a negative delta g. Endothermic requires heat and exothermic releases heat. Endothermic favors product formation and exothermic favors reactant formation.
by AlyssaBei_1F
Mon Jan 28, 2019 9:50 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Units of Kp
Replies: 9
Views: 285

Re: Units of Kp

Kp is usually atm or bar, but make sure you use the same units for all the gases in the problem.
by AlyssaBei_1F
Mon Jan 21, 2019 9:31 am
Forum: Ideal Gases
Topic: ICE table
Replies: 11
Views: 238

Re: ICE table

You can use it for both, but be careful when coming up with your final answer. Use Kp instead of Kw.
by AlyssaBei_1F
Mon Jan 21, 2019 9:26 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating pH of a weak acid and its salt
Replies: 4
Views: 148

Calculating pH of a weak acid and its salt

For calculating the pH of a weak acid and its salt, is an extra number given, but the steps to complete the problem are the same?
by AlyssaBei_1F
Mon Jan 21, 2019 9:25 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature for Equilibrium
Replies: 4
Views: 65

Temperature for Equilibrium

Is 25 degrees C the standard temperature for equilibrium?
by AlyssaBei_1F
Mon Jan 21, 2019 9:24 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 4
Views: 58

Le Chatelier's Principle

Can someone explain Le Chatelier's Principle?
by AlyssaBei_1F
Mon Jan 14, 2019 9:36 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Example from lecture on Wednesday
Replies: 2
Views: 49

Example from lecture on Wednesday

On Wednesday in lecture, Dr. Lavalle went over an example about ATP Hydrolysis with ATP + h20 as the reactants going to ADP + Pi. Can someone explain the ice table values, such as how he got them and the answer?
by AlyssaBei_1F
Mon Jan 14, 2019 9:32 am
Forum: Ideal Gases
Topic: Denoting brackets/parentheses
Replies: 9
Views: 108

Re: Denoting brackets/parentheses

Brackets are only used when dealing with concentration.
by AlyssaBei_1F
Mon Jan 14, 2019 9:30 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature
Replies: 6
Views: 116

Re: Temperature

If the temperature is increased, molecules increase their speed and movement. If temperature decreases, molecules decrease their speed and movement.
by AlyssaBei_1F
Mon Jan 14, 2019 9:26 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changing Temperature
Replies: 4
Views: 95

Re: Changing Temperature

When the heat is lowered, you are giving off heat, so it would be an exothermic reaction (shifting towards the formation of products).
by AlyssaBei_1F
Tue Jan 08, 2019 7:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem #1 5J 7th Edition
Replies: 1
Views: 51

Problem #1 5J 7th Edition

Can someone explain to me how to use the Le Chatelier's principle to figure out this problem?
by AlyssaBei_1F
Tue Jan 08, 2019 7:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K'
Replies: 3
Views: 57

Re: K'

K' refers to the reverse reaction. You can find K' by calculating 1/K.
by AlyssaBei_1F
Tue Jan 08, 2019 7:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs. Kp
Replies: 7
Views: 122

Re: Kc vs. Kp

Kp is only used when dealing with gases.
by AlyssaBei_1F
Tue Jan 08, 2019 7:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5H Problem #3 7th Edition
Replies: 2
Views: 46

5H Problem #3 7th Edition

When combining the two equations, why is Cl^2 not included in the final equation?
by AlyssaBei_1F
Mon Dec 03, 2018 4:32 pm
Forum: Naming
Topic: nitro vs nitrito
Replies: 3
Views: 59

Re: nitro vs nitrito

In the 7th edition book Table 9C.1 shows the difference. The N is underlined in nitro and the O is underlined in nitrito
by AlyssaBei_1F
Mon Dec 03, 2018 4:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 52

Polydentate

To figure out if a compound is polydentate, do we have to draw the lewis structure and count the number of lone pairs or is there an easier way to go about doing this?
by AlyssaBei_1F
Mon Dec 03, 2018 4:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 70

Coordination Number

To find the coordination number, do we have to draw the Lewis structure and count the number of bonds? Or is there an easier way than drawing the lewis structure?
by AlyssaBei_1F
Mon Dec 03, 2018 4:25 pm
Forum: Lewis Acids & Bases
Topic: 6C #19 7th Edition
Replies: 1
Views: 44

6C #19 7th Edition

In 6C #19 7th Edition, how can we conclude that HClO2 is a stronger acid than HClO?
by AlyssaBei_1F
Mon Nov 26, 2018 1:25 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 4
Views: 93

Re: Polarizability

For polarizability, would the trend decrease across a period from right to left because the atoms are getting smaller from right to left?
by AlyssaBei_1F
Mon Nov 26, 2018 1:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizability
Replies: 3
Views: 35

Re: Polarizability

Is there a trend for polarizability?
by AlyssaBei_1F
Mon Nov 26, 2018 1:16 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number
Replies: 4
Views: 55

Re: Oxidation Number

How do we know [Fe(CN)6] has an overall charge of -4? Is it given?
by AlyssaBei_1F
Mon Nov 26, 2018 1:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizability
Replies: 3
Views: 35

Polarizability

Can someone explain to me how to determine which atom has a higher polarizability?
by AlyssaBei_1F
Mon Nov 19, 2018 2:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 45

Sigma and Pi Bonds

Do we need to know how to draw sigma and pi bonds?
by AlyssaBei_1F
Mon Nov 19, 2018 2:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 46

Re: Bond Angles

<180 or <90
by AlyssaBei_1F
Mon Nov 19, 2018 2:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs and bonding
Replies: 4
Views: 95

Lone pairs and bonding

Can someone explain why larger lone pairs electrons force bonding electrons closer together?
by AlyssaBei_1F
Mon Nov 19, 2018 2:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular geometry vs Electronicgeometry
Replies: 3
Views: 66

Molecular geometry vs Electronicgeometry

What is the difference between molecular geometry vs electronicgeometry?
by AlyssaBei_1F
Mon Nov 12, 2018 1:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 5
Views: 96

Polarizing Power

Can someone explain to me how we determine polarizing power?
by AlyssaBei_1F
Mon Nov 12, 2018 1:29 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 12
Views: 406

Re: Formal Charge

A resonance is a Lewis structure that have bonds in different equivalent locations.
by AlyssaBei_1F
Mon Nov 12, 2018 1:27 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cations and polarizing power
Replies: 3
Views: 48

Cations and polarizing power

Can someone explain to me why smaller and more highly charged cations have more polarizing power?
by AlyssaBei_1F
Mon Nov 12, 2018 1:27 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cations and polarizing power
Replies: 2
Views: 71

Cations and polarizing power

Can someone explain to me why smaller and more highly charged cations have more polarizing power?
by AlyssaBei_1F
Mon Nov 12, 2018 1:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 69

Bond Angles

When determining bond angles, will a linear structure always have 180 degrees? Will a trigonal planar structure always have 120 degrees? Will a tetrahedral structure always have 109.5 degrees?
by AlyssaBei_1F
Mon Nov 12, 2018 1:18 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Energy of Bonds
Replies: 3
Views: 101

Re: Energy of Bonds

The energy is given and my TA said there is a sheet that tells you the energy of bonds.
by AlyssaBei_1F
Tue Nov 06, 2018 12:45 am
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 6
Views: 129

Bond Lengths

Can someone explain to me the process for determining bond lengths?
by AlyssaBei_1F
Tue Nov 06, 2018 12:44 am
Forum: Octet Exceptions
Topic: Octet rule vs. Formal charge
Replies: 7
Views: 158

Re: Octet rule vs. Formal charge

All elements must have an octet, but you look at formal charge to find the most stable Lewis structure.
by AlyssaBei_1F
Tue Nov 06, 2018 12:43 am
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 4
Views: 86

Re: Octet Exceptions

H, He, Li, and Be do not obtain a full octet. Elements in period 3 or below can have an expanded octet, including S, P, and Cl.
by AlyssaBei_1F
Sun Nov 04, 2018 9:49 pm
Forum: DeBroglie Equation
Topic: Kg vs Grams
Replies: 6
Views: 249

Re: Kg vs Grams

Kg is the SI unit. We only use grams when working with moles. Always convert to kg.
by AlyssaBei_1F
Sun Nov 04, 2018 5:54 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 4
Views: 86

Electronegativity

Does electronegativity have the same trend as electron affinity on the periodic table?
by AlyssaBei_1F
Sun Nov 04, 2018 5:51 pm
Forum: Properties of Light
Topic: Standard Units
Replies: 8
Views: 209

Re: Standard Units

Wavelength units are m or nm. If they give you nm, make sure to convert to m (SI unit for wavelength)
by AlyssaBei_1F
Sun Nov 04, 2018 5:43 pm
Forum: Lewis Structures
Topic: central atom
Replies: 7
Views: 118

Re: central atom

The central atom is most likely the atom with the lowest ionization energy
by AlyssaBei_1F
Sun Nov 04, 2018 5:39 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 4
Views: 95

Re: Atomic Radius

Electrons are equal to the number of protons. If an element has more protons, then it will have more electrons, causing the element to have more shells and be bigger.
by AlyssaBei_1F
Sun Nov 04, 2018 5:37 pm
Forum: Electronegativity
Topic: Problem 2D #11 (7th edition)
Replies: 2
Views: 61

Problem 2D #11 (7th edition)

On Problem 2D #11 (7th edition), can someone explain to me how O2- is smaller than N3- for polarizability?
by AlyssaBei_1F
Sun Nov 04, 2018 1:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Problem 1A #15 (7th edition book)
Replies: 1
Views: 138

Problem 1A #15 (7th edition book)

On Problem 1A #15 (7th edition book), I understand all the steps to get 0.112, but I am confused on how n2^2 is 9 and then you take the square root and the answer for n2 is 3. Can someone explain this to me?
by AlyssaBei_1F
Mon Oct 29, 2018 4:40 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 3
Views: 106

Bond Lengths

On today's lecture notes, there was bond lengths labeled on certain bonds. For example, in the benzene example the double bonds had 1.34A and the single bonds had 1.54A. I am confused on how we figure out these numbers.
by AlyssaBei_1F
Mon Oct 29, 2018 4:33 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 10
Views: 255

Re: lewis structure

The central atom is the atom in the middle. It is determined by the atom with the lowest ionization energy. Ionization energy increases up a group and increases across a period.
by AlyssaBei_1F
Mon Oct 29, 2018 4:31 pm
Forum: Lewis Structures
Topic: central atom
Replies: 7
Views: 118

Re: central atom

The central atom is the atom with the least ionization energy. Hydrogen is never a central atom. Ionization energy increases up a group and increases across a period making Flourine (F) have the largest ionization energy.
by AlyssaBei_1F
Mon Oct 29, 2018 4:28 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 20
Views: 640

Re: E=hv

The E would represent the energy of the photon. The work function or threshold energy would be the energy required to remove an electron.
by AlyssaBei_1F
Mon Oct 22, 2018 9:26 am
Forum: Properties of Light
Topic: kg or g [ENDORSED]
Replies: 11
Views: 255

Re: kg or g [ENDORSED]

kg is the SI unit. Grams is only used for moles. Also Joules is kg m^2 s^-2, so it would make sense to use kg.
by AlyssaBei_1F
Mon Oct 22, 2018 9:20 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 7th Edition Book, Section 1.D #23
Replies: 2
Views: 48

7th Edition Book, Section 1.D #23

In the 7th Edition Book, Section 1.D #23, it asks how many orbitals can have the following quantum numbers in an atom? I understand how to get a, b, and d, but I an confused on c) n=2. Can someone explain to me how the answer is 4?
by AlyssaBei_1F
Mon Oct 22, 2018 9:17 am
Forum: Einstein Equation
Topic: 7th Edition Book, Section 1.A #9
Replies: 2
Views: 186

7th Edition Book, Section 1.A #9

In the 7th Edition Book, Section 1.A #9 it asks for us to fill out a chart. I understand the first three columns, but don't understand the last column that says "event." How do we know the event based on the answers we found and are given? Is there a chart that tells you the event based on...
by AlyssaBei_1F
Mon Oct 22, 2018 9:13 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 5
Views: 69

Electron Configuration

In the 7th edition book, section 1.E #13 asks to write the ground state electron configuration for a) silver. Is the answer [Kr]4d^105s^1 an okay answer or do we need to draw it out?
by AlyssaBei_1F
Sun Oct 21, 2018 11:37 am
Forum: Properties of Light
Topic: Equations
Replies: 6
Views: 106

Equations

Will we be given a sheet with equations for chemistry test #2?
by AlyssaBei_1F
Mon Oct 15, 2018 2:37 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg's Indeterminacy Equation
Replies: 2
Views: 62

Heisenberg's Indeterminacy Equation

Can someone explain to me where 4pi comes from in the heisenberg indeterminacy equation?
by AlyssaBei_1F
Mon Oct 15, 2018 2:34 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative sign in front of Bohr Frequency Condition
Replies: 4
Views: 73

Re: Negative sign in front of Bohr Frequency Condition

The negative sign means the bound electron has lower energy than the free electron. The energy is still positive.
by AlyssaBei_1F
Mon Oct 15, 2018 2:28 pm
Forum: Properties of Electrons
Topic: Constructive vs Destructive
Replies: 3
Views: 75

Re: Constructive vs Destructive

Constructive is when waves are in phase, meaning the waves are on the same pattern which creates a greater amplitude. Destructive is when waves are out of phase, meaning the waves are opposite of each other, which creates a smaller amplitude. This shows that waves show diffraction patterns and have ...
by AlyssaBei_1F
Mon Oct 15, 2018 2:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Planck's constant
Replies: 7
Views: 103

Re: Planck's constant

Planck's constant is used in the equation E=hv(frequency) and various others. It is equal to 6.626x10^-34 J/s
by AlyssaBei_1F
Tue Oct 09, 2018 3:17 pm
Forum: Empirical & Molecular Formulas
Topic: when to multiply empirical formula [ENDORSED]
Replies: 9
Views: 381

Re: when to multiply empirical formula [ENDORSED]

You want to multiply by the smallest possible number that will give you a whole number. I would multiply 3.5 by 2 to get 7.
by AlyssaBei_1F
Tue Oct 09, 2018 3:15 pm
Forum: Properties of Light
Topic: Wavelength vs Frequency
Replies: 7
Views: 92

Re: Wavelength vs Frequency

Wavelength is the distance from one peak to another. Frequency is the amount of waves over a given period.
by AlyssaBei_1F
Tue Oct 09, 2018 3:10 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical vs Actual Yield
Replies: 5
Views: 322

Re: Theoretical vs Actual Yield

The theoretical yield is always bigger because due to side reactions, impurities, etc. the actual yield will be less.
by AlyssaBei_1F
Tue Oct 09, 2018 3:07 pm
Forum: Molarity, Solutions, Dilutions
Topic: Finding the volume of stock solution to dilute
Replies: 12
Views: 392

Re: Finding the volume of stock solution to dilute

It does not matter if you use mL or L, but you have to stay consistent throughout the whole problem. I usually just change to liters.
by AlyssaBei_1F
Sun Oct 07, 2018 2:08 pm
Forum: Properties of Light
Topic: Topic 1A #3
Replies: 2
Views: 58

Topic 1A #3

I am confused on this problem. To find out all the parts (a,b,c,d) do we only use the equation E=hv or do we need to use another equation also?
by AlyssaBei_1F
Sun Oct 07, 2018 1:55 pm
Forum: Photoelectric Effect
Topic: Photoelectric Equations
Replies: 1
Views: 38

Re: Photoelectric Equations

The correct answer would be d (E=hv). E = energy h= Planck's constant v= frequency
by AlyssaBei_1F
Sun Oct 07, 2018 1:50 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 136

Re: Molecular Formula

The molecular formula tells you how many atoms there are per element, so all you would need to do is count the atoms. You would not be able to do this with the empirical formula though because the empirical formula is a ratio.
by AlyssaBei_1F
Sun Oct 07, 2018 1:44 pm
Forum: Properties of Light
Topic: C=Delta x V
Replies: 6
Views: 82

Re: C=Delta x V

The only equation I can think of is c=(lamba)x(v). I don't think c=delta x v exists.
by AlyssaBei_1F
Tue Oct 02, 2018 2:18 pm
Forum: Balancing Chemical Reactions
Topic: States of Atoms
Replies: 7
Views: 118

Re: States of Atoms

For the states of atoms, I would just look it up. After doing problems with the states of atoms, it becomes easier because you see it more often.
by AlyssaBei_1F
Mon Oct 01, 2018 4:20 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 2
Views: 155

Limiting Reactant

On the limiting reactant video, the example is calcium carbonate reacts with water to form calcium hydroxide and ethyne. I understand up to calculating the moles of CaC2 and H2O, but am confused why we have to multiply 1.56 (moles of CaC2) by 2. Can someone help me with this?
by AlyssaBei_1F
Mon Oct 01, 2018 4:10 pm
Forum: SI Units, Unit Conversions
Topic: Naming Compounds
Replies: 8
Views: 220

Re: Naming Compounds

Sadly there is no trick, the best way is to memorize.
by AlyssaBei_1F
Mon Oct 01, 2018 3:49 pm
Forum: Limiting Reactant Calculations
Topic: Limiting reagents
Replies: 12
Views: 181

Re: Limiting reagents

The limiting reagent is the reactant that gets used up first in a chemical reaction. It determines how much product is produced. There cannot be two limiting reagents because once one reactant is used up the reaction cannot continue.

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