Search found 103 matches

by Astrid Lunde 1I
Tue Mar 10, 2020 10:08 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 7b.3c - where did the ln come from?
Replies: 6
Views: 37

Re: 7b.3c - where did the ln come from?

It is a first order rate law so use lnA = -kt + lnA
by Astrid Lunde 1I
Tue Mar 10, 2020 10:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 6
Views: 50

Re: Calculating K

K has no units because it is a ration.
by Astrid Lunde 1I
Tue Mar 10, 2020 10:00 pm
Forum: General Rate Laws
Topic: Determining Rate Laws
Replies: 4
Views: 26

Re: Determining Rate Laws

You can also look at K's units to find which order it is. M/S is 0th order. 1/S is 1st order. 1/SM is 2nd order.
by Astrid Lunde 1I
Tue Mar 10, 2020 9:58 pm
Forum: Phase Changes & Related Calculations
Topic: delta G0 versus delta G
Replies: 15
Views: 180

Re: delta G0 versus delta G

Anything with a o means that it is standard. So o is standard and is regular.
by Astrid Lunde 1I
Tue Mar 10, 2020 9:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equations
Replies: 8
Views: 95

Re: Equations

∆G° = ∆H° - T∆S°and ∆G° = - RT ln K and G=-nFE are essential, but are also on your equation sheet.
by Astrid Lunde 1I
Thu Mar 05, 2020 4:51 pm
Forum: Balancing Redox Reactions
Topic: Acidic and Basic Redox Reactions
Replies: 9
Views: 66

Re: Acidic and Basic Redox Reactions

It should specify if it is Basic or Acidic. Acidic meaning balance with H+ and Basic meaning balance with OH-.
by Astrid Lunde 1I
Thu Mar 05, 2020 4:45 pm
Forum: Balancing Redox Reactions
Topic: oxidizing and reducing agents
Replies: 10
Views: 66

Re: oxidizing and reducing agents

Look at the oxidation numbers of the different elements.
by Astrid Lunde 1I
Thu Mar 05, 2020 4:41 pm
Forum: Balancing Redox Reactions
Topic: Half reactions
Replies: 6
Views: 57

Re: Half reactions

Add H2O fist to balance the oxygen and then the H+ to balance the hydrogen.
by Astrid Lunde 1I
Thu Mar 05, 2020 4:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram Order
Replies: 8
Views: 83

Re: Cell Diagram Order

The anode is on the left and the cathode is on the right. Make sure you put lines in between the solid, gas and aq.
by Astrid Lunde 1I
Thu Mar 05, 2020 4:35 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Metals
Replies: 4
Views: 29

Re: Inert Metals

I would use Pt(s) as it is more common.
by Astrid Lunde 1I
Mon Mar 02, 2020 12:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Notation commas
Replies: 4
Views: 43

Re: Cell Notation commas

The comas are used in a cell diagram to separate two of the same states in a half reaction.
by Astrid Lunde 1I
Mon Mar 02, 2020 12:03 pm
Forum: Balancing Redox Reactions
Topic: Oxidation/Reduction
Replies: 17
Views: 159

Re: Oxidation/Reduction

Find the change in oxidation number for an atom. If the oxidation number decreases from reactants to products then it is reduction. If the oxidation number increases from reactants to products then it is oxidized.
by Astrid Lunde 1I
Mon Mar 02, 2020 12:01 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Order of compounds in cell diagram?
Replies: 5
Views: 36

Re: Order of compounds in cell diagram?

anode is the left and cathode is the right. Also remember aq us closest to the center of the cell diagram than gas and lastly solid.
by Astrid Lunde 1I
Mon Mar 02, 2020 11:59 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: k
Replies: 10
Views: 89

Re: k

k is the constant rate so it has no units.
by Astrid Lunde 1I
Mon Mar 02, 2020 11:58 am
Forum: Balancing Redox Reactions
Topic: Anode and Xathod
Replies: 9
Views: 57

Re: Anode and Xathod

Cathode is were reduction occurs and anode is were oxidation occurs.
by Astrid Lunde 1I
Wed Feb 19, 2020 10:28 pm
Forum: Balancing Redox Reactions
Topic: Understanding Half-Reactions
Replies: 11
Views: 86

Re: Understanding Half-Reactions

It helps you separate what is being reduced and what is being oxidized in the reaction. After balancing the reduction and oxidation separately we can then add them together to make the overall balanced redox reaction. This would be a lot more difficult to do if we did not separate them first.
by Astrid Lunde 1I
Wed Feb 19, 2020 10:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 14
Views: 313

Re: Anode and Cathode

CNourian2H wrote:how do the terms anode and cathode relate to oxidation and reduction. He used the latter pair of terms to define anode and cathode, but can someone explain this further?

Cathode is the reduction reaction and the anode is the oxidation reaction.
by Astrid Lunde 1I
Wed Feb 19, 2020 10:15 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode position
Replies: 5
Views: 34

Re: Anode and Cathode position

It is usually written in that order, but I would always double check to see where the oxidation and reduction reactions are placed in correspondence to the left and the right of the galvanic cell.
by Astrid Lunde 1I
Wed Feb 19, 2020 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Lavelle's Office Hours
Replies: 5
Views: 95

Re: Lavelle's Office Hours

Does anyone know what Lavelle's office hours are like? Is it going over general HW problems and information, or do we need to ask him questions and bring our own HW problems in? It's similar to the TA office hours where you are able to ask questions. When I went it was mostly questions regarding th...
by Astrid Lunde 1I
Wed Feb 19, 2020 10:09 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 5
Views: 24

Re: Balancing Redox Reactions

To write the half reactions you need find out what is being oxidized and reduced which you do by finding the oxidation number for each species present.
by Astrid Lunde 1I
Fri Feb 14, 2020 10:13 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Why is delta U = 0 for isothermal reactions?
Replies: 11
Views: 166

Re: Why is delta U = 0 for isothermal reactions?

U is equal to 0 because it is an isolated system so there is no energy energy leaving or going into the system.
by Astrid Lunde 1I
Fri Feb 14, 2020 10:09 am
Forum: Student Social/Study Group
Topic: Midterm
Replies: 8
Views: 326

Re: Midterm

Question 8 was problem 4I.9 on our homework problems, that is what my TA said.
by Astrid Lunde 1I
Fri Feb 14, 2020 10:02 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: PV=nRT
Replies: 5
Views: 45

Re: PV=nRT

In that case I would use P1V1=P2V2. PV=nRT is usually used when you have three values and the constant and only need to solve for the last value.
by Astrid Lunde 1I
Fri Feb 14, 2020 10:00 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv vs Cp
Replies: 17
Views: 225

Re: Cv vs Cp

Cv is constant volume and Cp is constant pressure.
by Astrid Lunde 1I
Fri Feb 14, 2020 9:59 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Delta S
Replies: 8
Views: 108

Re: Delta S

delta S is the total between delta S of the surroundings and the system.
by Astrid Lunde 1I
Fri Feb 07, 2020 9:28 pm
Forum: Phase Changes & Related Calculations
Topic: -w vs w
Replies: 15
Views: 102

Re: -w vs w

w is when work is being done one the system. -w is when the system is doing work.
by Astrid Lunde 1I
Fri Feb 07, 2020 9:25 pm
Forum: General Science Questions
Topic: Midterm
Replies: 17
Views: 282

Re: Midterm

There are many review sessions for the midterm. The one on Sunday should cover everything with practice problems.
by Astrid Lunde 1I
Fri Feb 07, 2020 9:21 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 417

Re: Isolated vs Closed [ENDORSED]

Closed system can exchange heat while an isolated system has no effect from the surroundings.
by Astrid Lunde 1I
Fri Feb 07, 2020 9:19 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 14
Views: 89

Re: closed vs isolated

Isolated systems do not interact with the environment around it. A closed system can transfer energy.
by Astrid Lunde 1I
Fri Feb 07, 2020 9:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system
Replies: 8
Views: 56

Re: isolated system

It is so tightly sealed that the volume can not change and there is no effect from the outside system.
by Astrid Lunde 1I
Tue Jan 28, 2020 4:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Adding Enthalpies
Replies: 5
Views: 32

Re: Adding Enthalpies

Because they are state functions the enthalpies should be added.
by Astrid Lunde 1I
Tue Jan 28, 2020 4:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: qp vs qv
Replies: 6
Views: 41

Re: qp vs qv

There are really no other differences other then what you said qv occurs under constant volume and qp under constant pressure.
by Astrid Lunde 1I
Tue Jan 28, 2020 4:09 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 418

Re: Kc vs Kp

Kp is when you deal with partial pressure so it is used for gasses. Use Kc when you see aq.
by Astrid Lunde 1I
Tue Jan 28, 2020 4:05 pm
Forum: Ideal Gases
Topic: Chemical Equilibrium
Replies: 4
Views: 27

Re: Chemical Equilibrium

Catalyst speeds up the reaction.
by Astrid Lunde 1I
Tue Jan 28, 2020 4:04 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Gas Constant
Replies: 13
Views: 71

Re: Gas Constant

The gas constant is given on the formula sheet, make sure you chose the one with the units that apply to the equation.
by Astrid Lunde 1I
Tue Jan 21, 2020 8:13 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acids and Bases
Replies: 7
Views: 47

Re: Acids and Bases

Acids donate protons and bases accept protons.
by Astrid Lunde 1I
Tue Jan 21, 2020 8:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: partial pressure
Replies: 5
Views: 41

Re: partial pressure

They both work, check what units are given in the problem and use the same units.
by Astrid Lunde 1I
Tue Jan 21, 2020 8:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice box approximation
Replies: 9
Views: 71

Re: ice box approximation

If the K value is less than 10^-3 then you can approximate and there is not need for the quadratic formula.
by Astrid Lunde 1I
Tue Jan 21, 2020 8:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Calculator
Replies: 4
Views: 47

Re: Calculator

Yes, scientific calculators are permitted, however graphing calculators are not.
by Astrid Lunde 1I
Tue Jan 21, 2020 8:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Test One Content
Replies: 6
Views: 88

Re: Test One Content

It is on chemical equilibrium as well as acids and bases
by Astrid Lunde 1I
Wed Jan 15, 2020 3:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and Exothermic Reactions Class Example
Replies: 5
Views: 48

Re: Endothermic and Exothermic Reactions Class Example

The N2 bonds are broken which requires heat making it an endothermic reaction.
by Astrid Lunde 1I
Wed Jan 15, 2020 3:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: x is small approximation
Replies: 6
Views: 56

Re: x is small approximation

We can approximate if x is less then 1.0 x 10^-4.
by Astrid Lunde 1I
Wed Jan 15, 2020 3:21 pm
Forum: Ideal Gases
Topic: mole fraction
Replies: 4
Views: 36

Re: mole fraction

Yes, you multiply the mole fraction with the total pressure to get the partial pressure.
by Astrid Lunde 1I
Wed Jan 15, 2020 3:17 pm
Forum: Ideal Gases
Topic: equilibrium constant
Replies: 5
Views: 42

Re: equilibrium constant

K represents the ratio of products to reactants so P/R.
by Astrid Lunde 1I
Wed Jan 15, 2020 3:14 pm
Forum: Ideal Gases
Topic: bars vs atm
Replies: 8
Views: 62

Re: bars vs atm

They are two different units, but they do the same thing:measure pressure. As long as you are constant with what unit you use for a single problem you should be ok.
by Astrid Lunde 1I
Thu Jan 09, 2020 4:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solid/liquid
Replies: 7
Views: 46

Re: solid/liquid

Yes the solids and liquids have no effect on the calculation.
by Astrid Lunde 1I
Thu Jan 09, 2020 4:55 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Kc Vs Kp
Replies: 18
Views: 159

Re: Using Kc Vs Kp

The units in the question should help you find out when to use Kc and Kp. Kc is in M and Kp is in Bar.
by Astrid Lunde 1I
Thu Jan 09, 2020 4:52 pm
Forum: Ideal Gases
Topic: K
Replies: 10
Views: 83

Re: K

Yes it will still be the same, but Kc is in terms of Moles and Kp is in terms of Bars.
by Astrid Lunde 1I
Thu Jan 09, 2020 4:48 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 132

Re: Understanding Q

Yes you can solve Q the same way as you would solve K.
by Astrid Lunde 1I
Thu Jan 09, 2020 4:47 pm
Forum: Ideal Gases
Topic: K value
Replies: 14
Views: 94

Re: K value

When K is a large value > 10^3 then there are more products at equilibrium. When K is a small value <10^-3 then there are more reactants.
by Astrid Lunde 1I
Fri Dec 06, 2019 11:51 am
Forum: Air Pollution & Acid Rain
Topic: Acid Rain
Replies: 5
Views: 161

Re: Acid Rain

Acid rain is when CO2 reacts in the atmosphere which results in acid rain. This rain, like stated in the name, is Acidic. When there is an excessive amount of CO2 in the air there will be a lot of acid rain. This contributes to the greenhouse effect and global warming.
by Astrid Lunde 1I
Fri Dec 06, 2019 11:48 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Definition
Replies: 4
Views: 46

Re: Ligand Definition

Ligands are ions or molecules that are attached to the central atom, they are lewis acids.
by Astrid Lunde 1I
Fri Dec 06, 2019 11:45 am
Forum: Bond Lengths & Energies
Topic: Hydrogen Bonding
Replies: 9
Views: 191

Re: Hydrogen Bonding

Hydrogen bonding occurs when the hydrogen bonds with N,O or F
by Astrid Lunde 1I
Fri Dec 06, 2019 11:41 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and Ka
Replies: 9
Views: 145

Re: pKa and Ka

One thing to know that Dr. Lavelle mentioned in class is that if a pKa value is given it is highly likely that that acid is a weak acid. Strong acids strongly favor the products and, thus, have an astronomically large pKa. Does that mean strong acids have a high conc of H+? Yes, the pKa is so large...
by Astrid Lunde 1I
Fri Dec 06, 2019 11:35 am
Forum: Coordinate Covalent Bonds
Topic: Hemoglobin and Myoglobin
Replies: 1
Views: 107

Re: Hemoglobin and Myoglobin

know how to draw the lewis structure. Hemoglobin transports oxygen thought the bloodstream because the oxygens are weakly attached, bonds to 4 oxygens. Myoglobin stores oxygen in muscles because the single oxygen is strongly attached.
by Astrid Lunde 1I
Sun Dec 01, 2019 4:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: When VSEPR doesn't work
Replies: 4
Views: 53

Re: When VSEPR doesn't work

For Lavell's class I think we should stick to using VSEPR theory to determine the shape of a molecule as he taught in lecture.
by Astrid Lunde 1I
Sun Dec 01, 2019 4:27 pm
Forum: Sigma & Pi Bonds
Topic: Drawing Sigma and Pi bonds
Replies: 7
Views: 95

Re: Drawing Sigma and Pi bonds

You should name the bonds individually and draw the sigma next to the first bond and the pi next to the second and/or third bond, depending on the number of bonds.
by Astrid Lunde 1I
Sun Dec 01, 2019 4:26 pm
Forum: Naming
Topic: Roman numerals
Replies: 6
Views: 45

Re: Roman numerals

The roman numeral tells us the charge on the metal ion.
by Astrid Lunde 1I
Sun Dec 01, 2019 4:24 pm
Forum: Hybridization
Topic: Hybridization of Hydrogen
Replies: 3
Views: 35

Re: Hybridization of Hydrogen

It can only from one bond because it only has one electron, which is in the 1s orbital so it can only be hybridized in the 1s orbital.
by Astrid Lunde 1I
Sun Dec 01, 2019 4:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polarity
Replies: 10
Views: 105

Re: Determining Polarity

Check the net dipoles of the molecule. If you see lone pairs the molecule will always be polar.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:43 pm
Forum: Resonance Structures
Topic: Resonance and Naming
Replies: 11
Views: 217

Re: Resonance and Naming

No, it is the same compound.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:40 pm
Forum: Sigma & Pi Bonds
Topic: How to Find Sigma Bonds and Pi Bonds
Replies: 15
Views: 296

Re: How to Find Sigma Bonds and Pi Bonds

Look at the lewis structure and the bonds formed between the atoms. single bond is 1 sigma bond, double bond is 1 sigma and 1 pi bond, triple bond is 1 sigma and 2 pi bonds. So the fist bond is always sigma and anything after is a pi bond.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What are Ligands?
Replies: 6
Views: 59

Re: What are Ligands?

A ligan is a ion or a molecule bonding to a metal atom.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:30 pm
Forum: Naming
Topic: Naming Order
Replies: 6
Views: 60

Re: Naming Order

The naming of the molecule should be in alphabetical order.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 23
Views: 197

Re: Seesaw

Yes, it would be less because the lone pairs push on the other bonds.
by Astrid Lunde 1I
Sat Nov 23, 2019 6:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPER shape for IF4-
Replies: 5
Views: 56

Re: VSEPER shape for IF4-

The electron geometry is octahedral and the molecular geometry is square planar.
by Astrid Lunde 1I
Wed Nov 13, 2019 9:03 pm
Forum: Hybridization
Topic: 2F.5
Replies: 4
Views: 51

Re: 2F.5

You add the number of lone pars of the atom to the number of atoms the atom is bonded to.
by Astrid Lunde 1I
Wed Nov 13, 2019 8:54 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: bond order
Replies: 4
Views: 298

Re: bond order

805097738 wrote:can someone explain what bond order is?


Bond order is measure of the number of electrons involved in bonds between atoms in the molecule. The higher the bond order means the stronger the chemical bond.
by Astrid Lunde 1I
Wed Nov 13, 2019 8:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPER shape for IF4-
Replies: 5
Views: 56

Re: VSEPER shape for IF4-

It is octahedral because there are 6 bonding pars and 2 lone pairs. Square planar is when there are 4 bonding pairs and two lone pairs.
by Astrid Lunde 1I
Wed Nov 13, 2019 8:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.5 b
Replies: 4
Views: 39

Re: 2E.5 b

The are asking for the ClO2 cation so there are 18 electrons. The shape is trigonal planar and the bond angle is 120 degrees.
by Astrid Lunde 1I
Wed Nov 13, 2019 8:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.15
Replies: 3
Views: 34

Re: 2E.15

TeCl4 is See-saw shaped so the bond angles have to be 120 and 90.
by Astrid Lunde 1I
Fri Nov 08, 2019 3:44 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 18
Views: 156

Re: Drawing Lewis Structures

No, not every atom has to have a formal charge of 0 but they all have to add up to 0 to make the formal charge of the molecule 0.
by Astrid Lunde 1I
Fri Nov 08, 2019 3:37 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 11
Views: 111

Re: Bond lengths

The bond lengths are all the same because the actual structure is a mix of all the resonance structures.
by Astrid Lunde 1I
Fri Nov 08, 2019 3:31 pm
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 190

Re: central atom

Yes, the optimal structure would be the middle atom having a 0 charge.
by Astrid Lunde 1I
Fri Nov 08, 2019 3:26 pm
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 190

Re: central atom

APatel_4A wrote:How do we know what the central atom should be?


It is the least electronegative atom
by Astrid Lunde 1I
Fri Nov 08, 2019 2:57 pm
Forum: Resonance Structures
Topic: Formal Charge Question
Replies: 15
Views: 283

Re: Formal Charge Question

They have to add up to the same formal charge.
by Astrid Lunde 1I
Fri Nov 08, 2019 2:55 pm
Forum: Lewis Structures
Topic: Formal Charges
Replies: 15
Views: 144

Re: Formal Charges

505106414 wrote:Is it okay to break the octet rule in order to minimize formal charge?


No unless the atom itself is able to break the octet rule.
by Astrid Lunde 1I
Fri Nov 08, 2019 2:53 pm
Forum: Hybridization
Topic: Electrons
Replies: 13
Views: 485

Re: Electrons

It means the electron is exited
by Astrid Lunde 1I
Sat Nov 02, 2019 2:16 pm
Forum: Octet Exceptions
Topic: Exceptions?
Replies: 5
Views: 65

Re: Exceptions?

The elements in group 3 can break the octet rule.
by Astrid Lunde 1I
Wed Oct 30, 2019 5:00 pm
Forum: Lewis Structures
Topic: Valence Electrons from Periodic Table
Replies: 10
Views: 132

Re: Valence Electrons from Periodic Table

To find the valence electron from the periodic table look at the group number.
by Astrid Lunde 1I
Wed Oct 30, 2019 4:57 pm
Forum: Ionic & Covalent Bonds
Topic: Partial charge
Replies: 4
Views: 40

Re: Partial charge

They are found in ionic bonds as-well.
by Astrid Lunde 1I
Wed Oct 30, 2019 4:51 pm
Forum: Octet Exceptions
Topic: expanded valence shells
Replies: 2
Views: 36

Re: expanded valence shells

Some atoms are more stable with expanded valence shells like phosphorus when it bonds with Chlorine.
by Astrid Lunde 1I
Wed Oct 30, 2019 4:45 pm
Forum: Lewis Structures
Topic: 2B 19
Replies: 3
Views: 44

Re: 2B 19

It means each atom has to have an octet.
by Astrid Lunde 1I
Wed Oct 23, 2019 4:09 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs covalent
Replies: 8
Views: 347

Re: Ionic vs covalent

An ionic bond is the transfer of electrons from a metal to a non metal atom.
A covalent bond is the sharing of electrons of non metals.
by Astrid Lunde 1I
Wed Oct 23, 2019 4:03 pm
Forum: Octet Exceptions
Topic: Octet Rule
Replies: 6
Views: 62

Re: Octet Rule

There are a few exceptions, but generally yes they need to follow the octet rule.
by Astrid Lunde 1I
Wed Oct 23, 2019 3:57 pm
Forum: Lewis Structures
Topic: Molecule Formulas
Replies: 5
Views: 415

Re: Molecule Formulas

They should all be given, however I assume we would have to know simple molecules like water.
by Astrid Lunde 1I
Wed Oct 23, 2019 3:54 pm
Forum: Lewis Structures
Topic: Finding Valence Electrons
Replies: 8
Views: 71

Re: Finding Valence Electrons

To find the number of valence electrons look at the group number, however this does not work for d block elements.
by Astrid Lunde 1I
Wed Oct 23, 2019 3:51 pm
Forum: Lewis Structures
Topic: Electronegativity
Replies: 5
Views: 58

Re: Electronegativity

Electronegativity decreases down a group and increases across a period.
by Astrid Lunde 1I
Wed Oct 16, 2019 5:10 pm
Forum: Quantum Numbers and The H-Atom
Topic: X Y and Z
Replies: 7
Views: 108

Re: X Y and Z

In his lecture today, Lavelle emphasized that the plane the electron is found in is arbitrary and different textbooks associate different l values with different x,y, and z planes. So, because he said this we can assign the x,y,z variables to the values we have correct? That confused me as well. I ...
by Astrid Lunde 1I
Wed Oct 16, 2019 5:05 pm
Forum: Trends in The Periodic Table
Topic: Ionic radii
Replies: 11
Views: 82

Re: Ionic radii

As you go down the group the number of electrons increases for each atom. You then get more shells and the valence electrons in the outermost shell get farther away from the nucleus.
by Astrid Lunde 1I
Wed Oct 16, 2019 5:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum
Replies: 2
Views: 19

Re: Magnetic Quantum

No, I think as long as you list them you should be fine.
by Astrid Lunde 1I
Wed Oct 16, 2019 3:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: X Y and Z
Replies: 7
Views: 108

Re: X Y and Z

I think this is related to the model that was shown during the lecture today. Depending on the number we can use the table to find out if it is x, y, or z.
by Astrid Lunde 1I
Wed Oct 16, 2019 3:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron spin
Replies: 8
Views: 124

Re: Electron spin

Is it only possible for an electron to have a +1/2 or -1/2 spin?
by Astrid Lunde 1I
Wed Oct 09, 2019 12:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines
Replies: 3
Views: 77

Re: Spectral Lines

Location on the electromagnetic spectrum doesn't exactly determine which series a line belongs to. Each line represents energy released by the movement of a hydrogen electron from one energy level to a lower energy level. Each energy level is represented by what's called the principal quantum numbe...
by Astrid Lunde 1I
Wed Oct 09, 2019 12:22 pm
Forum: Properties of Electrons
Topic: Changes in Orbitals
Replies: 3
Views: 43

Re: Changes in Orbitals

Im pretty sure you would use the equation
Correct me if I'm wrong.
by Astrid Lunde 1I
Wed Oct 09, 2019 12:15 pm
Forum: *Black Body Radiation
Topic: Black Body
Replies: 5
Views: 94

Re: Black Body

I think professor mentioned in class that the perfect black body that can absorb all frequencies of light does not currently exist. Cuz if we can still see it, it must has reflected some sort of frequencies which are able to be detected by our eyes, or it will just be invisible. Plz correct me if I...
by Astrid Lunde 1I
Wed Oct 09, 2019 12:10 pm
Forum: Properties of Light
Topic: Photons
Replies: 7
Views: 80

Re: Photons

A photon is just the name for a quantum of light, right?
by Astrid Lunde 1I
Wed Oct 09, 2019 12:05 pm
Forum: Properties of Light
Topic: Self-test 1A.1B
Replies: 4
Views: 48

Re: Self-test 1A.1B

Joseph Saba wrote:I believe since we use the equation c = w*f, then 3e8= 98.6e6x. to solve for x (wavelength) then divide by the frequency. I got 3.05 meters.

Are c and w*f constant values in the equation you used?
by Astrid Lunde 1I
Thu Oct 03, 2019 1:33 pm
Forum: Limiting Reactant Calculations
Topic: Percentage Yields
Replies: 8
Views: 125

Re: Percentage Yields

Percent yield means the actual yield divided by the theoretical yield. You want the percent yield to be as close to 100% as possible to get the maximum amount of yield form the product you created.
by Astrid Lunde 1I
Thu Oct 03, 2019 1:28 pm
Forum: Balancing Chemical Reactions
Topic: "Combustion" Term
Replies: 8
Views: 182

Re: "Combustion" Term

You can use the term Metabolism which is a general term for biological processes.
Or you can use the term Oxidation which means the compound reacts with oxygen.

Go to advanced search