Search found 94 matches

by Orly Termeie 3I
Sat Mar 12, 2016 4:10 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: How to draw the reaction coordinate diagram
Replies: 1
Views: 1275

How to draw the reaction coordinate diagram

Can someone please demonstrate how you would draw out this graph?
by Orly Termeie 3I
Sat Mar 12, 2016 4:01 am
Forum: *Electrophilic Addition
Topic: Electrophilic addition products
Replies: 1
Views: 245

Electrophilic addition products

Can someone please explain part c to me? How would you get 2-bromo?
by Orly Termeie 3I
Fri Mar 11, 2016 10:17 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: Fuel cells
Replies: 1
Views: 643

Re: Fuel cells

If Delta G is negative the fuel cell would be feasible and thus, the cell potential would have to be positive. Since the products would have a lower energy than the reactants which is favorable.
by Orly Termeie 3I
Thu Mar 10, 2016 7:41 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Naming with cis/trans
Replies: 1
Views: 291

Naming with cis/trans

If asked to draw the conformation of a cyclohexane and it has more than two substituents do we still use cis/trans to name it? Also do we only use cis and trans for cyclohexane or all types of cyclos?
by Orly Termeie 3I
Wed Mar 09, 2016 8:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887401

Re: Chemistry Jokes

:)
by Orly Termeie 3I
Wed Mar 09, 2016 7:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887401

Re: Chemistry Jokes

What is Connie's nickname?

SiliCon
by Orly Termeie 3I
Tue Mar 08, 2016 11:21 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Which has higher heat capacity?
Replies: 1
Views: 244

Re: Which has higher heat capacity?

Heat capacity increases as molecular complexity increases. When there are more atoms in a molecule there are further bond vibrations available. These vibrations are able to absorb energy. Also ethane has a single bond, but ethene has a double bond that makes it more restricting and cannot absorb add...
by Orly Termeie 3I
Wed Mar 02, 2016 10:17 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Delta G negative
Replies: 1
Views: 231

Delta G negative

Why is delta G negative for exergonic reactions?
by Orly Termeie 3I
Wed Mar 02, 2016 9:14 pm
Forum: *Electrophilic Addition
Topic: Adding reactants
Replies: 1
Views: 299

Adding reactants

When demonstrating the mechanisms and using arrows to show the flow of electrons should we include an addition sign, such as HBr + the double bonded carbon chain or just not include one?
by Orly Termeie 3I
Wed Mar 02, 2016 5:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Competition
Replies: 66
Views: 23899

Thermodynamics and Interesting Applications Video

Made by Orly Termeie. Enjoy!
by Orly Termeie 3I
Mon Feb 29, 2016 2:36 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Transition states
Replies: 1
Views: 272

Transition states

Should we draw the transition state diagrams for both the SN2 and Electrophilic addition mechanisms?
by Orly Termeie 3I
Sun Feb 28, 2016 4:59 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Vinyl
Replies: 1
Views: 241

Vinyl

I am still confused as to what vinyl means. Can someone please explain what it means?
by Orly Termeie 3I
Thu Feb 25, 2016 11:55 pm
Forum: *Electrophiles
Topic: Electrophiles vs Nucelophiles
Replies: 2
Views: 318

Re: Electrophiles vs Nucelophiles

Hey! Something is usually a nucleophile if it has a negative charge or a full octet of electrons. Something is usually an electrophile if it has a positive charge and not a full octet. Thus it would want to gain electrons.
by Orly Termeie 3I
Tue Feb 23, 2016 6:03 pm
Forum: *Nucleophilic Substitution
Topic: Writing reactions
Replies: 1
Views: 265

Writing reactions

When writing reactions from now on should compounds like OH- be written as -OH to demonstrate which element is negatively charged?
by Orly Termeie 3I
Sun Feb 21, 2016 11:26 pm
Forum: *Nucleophiles
Topic: Ambident Nucleophile
Replies: 2
Views: 375

Ambident Nucleophile

How can I identify a ambident nucleophile? In the homework chapter 4 question 5 the options were NH2CH3, CH3O-, SCN-, and -CH3 why was the answer SCN-?
by Orly Termeie 3I
Fri Feb 19, 2016 6:00 pm
Forum: *Complex Reaction Coordinate Diagrams
Topic: Entropy
Replies: 2
Views: 495

Entropy

Why does entropy decrease when bonds are formed?
by Orly Termeie 3I
Tue Feb 16, 2016 4:09 pm
Forum: General Rate Laws
Topic: Rate constant
Replies: 2
Views: 345

Rate constant

Is the rate constant the same thing as the slope of a reaction?
by Orly Termeie 3I
Sat Feb 13, 2016 2:25 pm
Forum: Zero Order Reactions
Topic: Plots
Replies: 2
Views: 312

Plots

How can we tell if a reaction is a zero order, first order, or second order one when plotting a graph?
by Orly Termeie 3I
Tue Feb 09, 2016 6:03 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Finding S given 2 moles of a molecule
Replies: 1
Views: 265

Finding S given 2 moles of a molecule

If there are 2 moles of a molecule and 4 orientations would you do S=kln4^2(6.02x10^23)? Thanks!
by Orly Termeie 3I
Tue Feb 09, 2016 1:34 am
Forum: Calculating Work of Expansion
Topic: W= F x d
Replies: 1
Views: 498

W= F x d

In the W=F x D what does D stand for and how does it correlate with a graph or real life example?
by Orly Termeie 3I
Mon Feb 08, 2016 11:07 pm
Forum: Calculating Work of Expansion
Topic: Deriving irreversible work equation
Replies: 1
Views: 257

Deriving irreversible work equation

What's the difference between deriving the w=-Pdv equation through force and Area rather than through w=-integral(pdv)?
by Orly Termeie 3I
Mon Feb 08, 2016 8:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G equal maximum work
Replies: 2
Views: 831

Delta G equal maximum work

If Delta G is negative does that mean work will be done? Also does this correlation between work and Delta G occur only in standard conditions?
by Orly Termeie 3I
Mon Feb 08, 2016 5:41 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 2011 Midterm Q1B
Replies: 1
Views: 228

Re: 2011 Midterm Q1B

Internal energy is directly affected by temperature. If a system has a temperature change that automatically means delta U which is internal energy will change. Since temperature indicates random motion of particles which alters the Energy. So if temperature decreases so does internal energy. Also u...
by Orly Termeie 3I
Sun Feb 07, 2016 12:17 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Water in cell diagrams
Replies: 1
Views: 204

Water in cell diagrams

Why isn't water included in cell diagrams?
by Orly Termeie 3I
Sat Feb 06, 2016 9:45 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Eo=0? When same element
Replies: 1
Views: 203

Eo=0? When same element

Conceptually and mathematically why does Eo= 0 when the components in galvanic cells are the same?
by Orly Termeie 3I
Fri Feb 05, 2016 9:49 pm
Forum: Balancing Redox Reactions
Topic: Determining an ion's charge
Replies: 1
Views: 210

Determining an ion's charge

When determining the charge for an ion such as 2Cr^3+ would you say Cr has a +3 or +6 charge? Or for 3HgO2^-3 would Oxygen have a charge of -4 or -12? And Hg +1 or +9? Is this how you determine whether something is reduced? By looking at the overall charge or just the oxidation number?
by Orly Termeie 3I
Fri Feb 05, 2016 8:34 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: k>1
Replies: 1
Views: 288

k>1

Why is it that when a cathode is larger than an anode products are favored because k>1?
by Orly Termeie 3I
Thu Feb 04, 2016 6:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Conducting electrode
Replies: 1
Views: 165

Conducting electrode

What other electrodes other than platinum could be used as an electrode when there is no solid metal present?
by Orly Termeie 3I
Mon Feb 01, 2016 1:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Double lines in cell diagrams
Replies: 2
Views: 372

Double lines in cell diagrams

Will there always be double lines between the anode and cathode sections of a cell diagram?
by Orly Termeie 3I
Wed Jan 27, 2016 11:54 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Residual Entropy
Replies: 1
Views: 280

Residual Entropy

If you have a molecule such as PO4 ^3- how many arrangements does it have for residual entropy?
by Orly Termeie 3I
Tue Jan 26, 2016 11:36 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: The effect the number of moles has on Entropy
Replies: 1
Views: 663

The effect the number of moles has on Entropy

When determining whether entropy has decreased or increased or whether it is positive/negative we consider the relation between the number of moles on the products and reactants sides. However should we only consider the moles of gases or also liquid, aqueous, and solid ones as well?
by Orly Termeie 3I
Thu Jan 21, 2016 2:12 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Increase in Disorder
Replies: 2
Views: 550

Increase in Disorder

If there has been an increase in disorder will the change in Entropy be positive? And thus the reaction would be spontaneous?
by Orly Termeie 3I
Thu Jan 21, 2016 1:39 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Quiz #1
Replies: 2
Views: 320

Re: Quiz #1

Material from chapter 8 and 9 will be on the quiz. the practice quizzes in the workbook are a helpful guide as well.
by Orly Termeie 3I
Mon Jan 18, 2016 11:11 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Sign of Entropy
Replies: 1
Views: 329

Sign of Entropy

If Entropy is positive does it mean a process or change will be spontaneous?
by Orly Termeie 3I
Sat Jan 16, 2016 4:02 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Reversible reactions
Replies: 1
Views: 234

Reversible reactions

If a reaction is reversible does that automatically mean the change in temperature will be zero, and thus delta U will be zero?
by Orly Termeie 3I
Sat Jan 16, 2016 3:57 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy and Intermolecular Forces
Replies: 2
Views: 2018

Re: Entropy and Intermolecular Forces

Gases have the highest entropy and they also have the least amount of intermolecular forces present. This makes sense because if something has a high entropy it means energy and matter are dispersed disorderly. Gass molecules are spread out and are not rigid like in solids. Thus, the lower the inter...
by Orly Termeie 3I
Sat Jan 16, 2016 3:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Understanding q=-w
Replies: 2
Views: 360

Re: Understanding q=-w

q=-w when the change in internal energy (delta U) equals zero. This occurs when there is no temperature change. Since the equation for internal energy is q+w= Delta U when delta U equals zero it would be q+w=0 and then you subtract the w to the other side and then you get q=-w.
by Orly Termeie 3I
Sat Jan 16, 2016 3:34 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Finding limiting reactants for thermochemistry questions
Replies: 1
Views: 377

Finding limiting reactants for thermochemistry questions

For some questions in the homework we had to find the limiting reagent first in order to solve the question such as in 8.99. For which types of questions should we determine the limiting reagent for?
by Orly Termeie 3I
Wed Jan 13, 2016 11:50 pm
Forum: Calculating Work of Expansion
Topic: Calculating Work under constant pressure
Replies: 1
Views: 321

Calculating Work under constant pressure

When a reaction is under constant pressure and you need to calculate work would you use the w=-p(vfinal- vinitial) formula?
by Orly Termeie 3I
Tue Jan 12, 2016 12:58 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's law: Sig Figs
Replies: 1
Views: 284

Hess's law: Sig Figs

For Hess's law questions how would we determine the number of sig figs? Would it depend on the decimal point placement?
by Orly Termeie 3I
Sat Jan 09, 2016 5:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: q and Enthalpy
Replies: 1
Views: 236

q and Enthalpy

At constant pressure why does q equal Enthalpy? Thanks!
by Orly Termeie 3I
Fri Jan 08, 2016 7:43 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpy in Example 8.13
Replies: 1
Views: 268

Re: Bond Enthalpy in Example 8.13

The best way to determine how many bonds a compound will form would be to draw out the lewis structures, like how Professor Lavelle did in class and in the course reader.
by Orly Termeie 3I
Fri Jan 08, 2016 7:42 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 1
Views: 197

Standard Enthalpy of Formation

Hello! What is the difference between enthalpy and the standard enthalpy of formation? Thank you!
by Orly Termeie 3I
Wed Jan 06, 2016 10:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy Calculation References
Replies: 2
Views: 372

Re: Enthalpy Calculation References

I asked a TA today and she said we will not have to memorize the enthalpy values and that they will be provided to us.
by Orly Termeie 3I
Mon Jan 04, 2016 11:09 pm
Forum: Phase Changes & Related Calculations
Topic: ammonium nitrate dissolution
Replies: 2
Views: 607

Re: ammonium nitrate dissolution

Dissolution means breaking apart or disintegration. Furthermore, a reaction is endothermic when bonds are broken using energy. Thus, ammonium nitrate dissolution would be endothermic.
by Orly Termeie 3I
Sat Dec 05, 2015 11:28 am
Forum: Polyprotic Acids & Bases
Topic: H2So4
Replies: 1
Views: 337

H2So4

Hello! Why is the Ka1 value of H2So4 smaller than the Ka2 value?
by Orly Termeie 3I
Tue Dec 01, 2015 9:58 pm
Forum: Identifying Acidic & Basic Salts
Topic: Salts in Reactions
Replies: 1
Views: 294

Salts in Reactions

Why are salts not included when writing out a reaction? Also, on homework number 13.1 the question stated that HCl was added to a benzoic acid, but in the solutions manual HCl was not included in the reaction equation. Why is that?
by Orly Termeie 3I
Tue Dec 01, 2015 1:22 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Pkb
Replies: 1
Views: 429

Pkb

The lower the pkb the stronger the base correct? Also if this is true, why?
by Orly Termeie 3I
Mon Nov 30, 2015 1:05 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Determining weak bases
Replies: 3
Views: 842

Re: Determining weak bases

Hello! In the course reader towards the end of chapter 12 material there is a section that lists strong acids/ bases and another page detailing how you can't tell whether a base is strong or not. Hope this helps!
by Orly Termeie 3I
Wed Nov 25, 2015 9:43 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids with Carbon
Replies: 2
Views: 444

Acids with Carbon

Why are acids that contain Carbon usually weak? Thanks!
by Orly Termeie 3I
Tue Nov 24, 2015 5:12 pm
Forum: Conjugate Acids & Bases
Topic: Memorizing types of acids/bases
Replies: 3
Views: 678

Memorizing types of acids/bases

Are there other acids and bases that are not in the course reader that we should still know of?
by Orly Termeie 3I
Tue Nov 24, 2015 5:08 pm
Forum: Lewis Acids & Bases
Topic: Difference between Lewis and Bronsted bases
Replies: 1
Views: 1334

Difference between Lewis and Bronsted bases

When given a chemical formula how can you tell whether the acid given is a lewis acid or bronsted base?
by Orly Termeie 3I
Wed Nov 18, 2015 9:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K>1
Replies: 3
Views: 422

K>1

When k>1 the reaction has a tendency to form products correct? Thanks!
by Orly Termeie 3I
Sun Nov 15, 2015 3:42 pm
Forum: Naming
Topic: When to add "ion"
Replies: 1
Views: 214

Re: When to add "ion"

When the overall charge of the complex is negative or positive you would add the word ion at the end of the complex's name. You add -ate to the end of a transition metal's name when the charge of the complex (component in brackets) is negative.
by Orly Termeie 3I
Sun Nov 15, 2015 3:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Water
Replies: 2
Views: 386

Adding Water

Hello! When does the addition of water to a reaction at equilibrium affect concentration? Also, when computing the K value when are aqueous molecules included?
by Orly Termeie 3I
Thu Nov 12, 2015 6:19 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Compression and photosynthesis. 11.115 hmwk
Replies: 4
Views: 520

Re: Compression and photosynthesis. 11.115 hmwk

Since the reaction is already occurring in H2O, and is considered a liquid, it will not affect the reaction.
by Orly Termeie 3I
Wed Nov 11, 2015 5:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape of Coordination Compounds
Replies: 1
Views: 304

Shape of Coordination Compounds

Once you figure out the coordination number for a compound, for example four, how would you know whether the shape would be a tetrahedral or square planar?
by Orly Termeie 3I
Wed Nov 11, 2015 5:26 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Compression and photosynthesis. 11.115 hmwk
Replies: 4
Views: 520

Re: Compression and photosynthesis. 11.115 hmwk

Since H2O is a liquid, you would not consider its moles when determining the effect the compression would have. Thus, the number of moles on the products and reactants side would be almost identical. So there would not really be an effect. Hope this helped!
by Orly Termeie 3I
Wed Nov 11, 2015 5:13 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: When to use bi-, tri- vs. bis-, tris-?
Replies: 3
Views: 2262

Re: When to use bi-, tri- vs. bis-, tris-?

Hey! If the ligand is a polydentate, then you would use the bis, tris, etc prefixes. Hope this helps!
by Orly Termeie 3I
Wed Nov 11, 2015 5:10 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate Compound Formulas
Replies: 1
Views: 274

Coordinate Compound Formulas

Hello! When given the name for a coordinate compound and asked to write the formula, does the order in which you write the ligands matter? Thanks!
by Orly Termeie 3I
Wed Nov 11, 2015 5:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining Polydentate Structures Through Formula
Replies: 2
Views: 384

Re: Determining Polydentate Structures Through Formula

When I went to the Undergraduate advisers and TA office hours, they told me the best way is to memorize the type of ligand (mono,bi,tri) for all the ligands in the course reader. Hope this helps!
by Orly Termeie 3I
Sun Nov 08, 2015 3:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complex
Replies: 1
Views: 244

Chelating Complex

Hello! How can someone identify a chelating complex given the lewis structure of the compound or the name of the compound?
by Orly Termeie 3I
Wed Nov 04, 2015 8:30 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Angles
Replies: 1
Views: 221

Angles

Do Seesaw and trigonal bypyramidal shapes have a 180 degree angle?
by Orly Termeie 3I
Mon Nov 02, 2015 8:52 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO diagrams
Replies: 2
Views: 253

Re: MO diagrams

But since it's F2- wouldn't one F be more electronegative?
by Orly Termeie 3I
Sun Nov 01, 2015 1:16 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO diagrams
Replies: 2
Views: 253

MO diagrams

When doing the Molecular orbital diagram for molecules such as F2-, one F will be lower in energy than another, correct? Thanks!
by Orly Termeie 3I
Thu Oct 29, 2015 3:00 am
Forum: Dipole Moments
Topic: Polarity
Replies: 3
Views: 762

Polarity

Hello! Is XeF2Cl2 considered polar or nonpolar, and why? Also, why do square planar molecules have an exact bond angle of 90 degrees instead of less than 90 degrees? Thanks!
by Orly Termeie 3I
Sat Oct 24, 2015 5:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of IF5
Replies: 1
Views: 1107

Re: Shape of IF5

The VSEPR formula for IF5 is AX5E, because there are six regions of electron density, but one corresponds to a lone pair, which is why the name is square pyramidal. Look at page 109 in the textbook, it has a picture there. Hope this helps!
by Orly Termeie 3I
Sat Oct 24, 2015 4:52 pm
Forum: Lewis Structures
Topic: Element Arangement
Replies: 1
Views: 234

Element Arangement

Helllo! In regards to lewis structures, can we place the bonded elements symmetrically around the central atom or is that only when drawing the structure in molecular (3D) form? Also, does the order we place atoms around a central atom matter... for instance for ClNO2 do the Oxygens have to be oppos...
by Orly Termeie 3I
Sat Oct 24, 2015 1:50 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Character
Replies: 2
Views: 385

Re: Ionic Character

Electronegativity decreases as you go down a group. Thus, Sulfur is less electronegative than Oxygen, and so it would have an electronegative charge more similar with Carbon's.
by Orly Termeie 3I
Sat Oct 24, 2015 11:29 am
Forum: Lewis Structures
Topic: Homework 3.39.b
Replies: 1
Views: 279

Re: Homework 3.39.b

This is an ionic compound so the individual elements will not share electrons, so we do not create bonds for these elements. Instead, electrons are just transferred from one element to another. On page 65 in the workbook there is an example of this. Hope this helped!
by Orly Termeie 3I
Sat Oct 24, 2015 11:20 am
Forum: Hybridization
Topic: Hybridization
Replies: 1
Views: 269

Hybridization

In the Sulfate ion, if asked what orbitals the double bonded oxygen is using, would the answer be three 2sp2 orbitals and three 2p orbitals and the hybridized orbitals it is using is just three 2sp2 orbitals? For the sulfur would the orbitals be four 3sp3 orbitals and two 3d orbitals and the hybridi...
by Orly Termeie 3I
Sat Oct 24, 2015 8:38 am
Forum: Ionic & Covalent Bonds
Topic: Question regarding the central atom
Replies: 2
Views: 360

Re: Question regarding the central atom

I believe Nitrogen would be the central atom because it has a lower ionization energy than Oxygen's ionization energy. Hope this helps!
by Orly Termeie 3I
Fri Oct 23, 2015 7:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape
Replies: 1
Views: 174

Molecular shape

Hello! How would you draw the correct molecular shape of trigonal pyramidal, square planar, and square pyramidal? Thank you!
by Orly Termeie 3I
Thu Oct 22, 2015 11:03 pm
Forum: Hybridization
Topic: Lone Pair
Replies: 1
Views: 318

Re: Lone Pair

Lone pairs have strong repelling powers, so they would push the other bonds away from itself which would reduce the other bond angles. Lone pairs are used to write the AXE notation, and thus are useful in determining the shape of a molecule. Hope this helped!
by Orly Termeie 3I
Tue Oct 20, 2015 12:23 am
Forum: Octet Exceptions
Topic: Octet exceptions
Replies: 2
Views: 374

Octet exceptions

Is Bromine an exception to the octet rule? Can Bromine have an expanded octet? Thanks!
by Orly Termeie 3I
Thu Oct 15, 2015 11:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 1
Views: 221

Electron Configuration

Hello! When asked to complete an electron configuration, would we use the short hand method in which we use a Noble gas then the rest of the configuration, or should we list the full configuration? Thanks!
by Orly Termeie 3I
Thu Oct 15, 2015 7:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Valence Electrons
Replies: 2
Views: 1221

Valence Electrons

Hello! The number of valence electrons a element has is determined by the number of electrons in shells that are not full, correct? For instance Nickel has 10 valence electrons while Gallium has 3 correct? Also, how would you determine the valence electron configuration for these elements?
Thanks!
by Orly Termeie 3I
Tue Oct 13, 2015 4:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Significant numbers for Rydberg Questions
Replies: 2
Views: 466

Significant numbers for Rydberg Questions

Hello! When only given discrete values for n in an Rydberg question, such as 3 or 4, how many significant figures should be used? Thank you
by Orly Termeie 3I
Mon Oct 12, 2015 8:04 pm
Forum: Trends in The Periodic Table
Topic: Office Hours Oct. 9
Replies: 1
Views: 296

Re: Office Hours Oct. 9

The configuration of chromium plus one is [Neon] 3d5..... so, the Ml numbers could be -2,-1,0,1,2. Since the final electron is in the fifth d orbital depending on whether the electron started inhabiting from -2 or 2 the numbers for Ml would be either -2 or 2. You would start from -2 then -1 then 0 t...
by Orly Termeie 3I
Sun Oct 11, 2015 7:35 am
Forum: Trends in The Periodic Table
Topic: Electron Affininty
Replies: 1
Views: 260

Electron Affininty

Hello! Why does electron affinity decrease when going down a group?
by Orly Termeie 3I
Fri Oct 09, 2015 5:58 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations
Replies: 1
Views: 319

Re: Balancing Equations

Nitrogen and Oxygen are diatomic molecules so when you use them in equations separately they are N2 and O2. The following list includes the diatomic molecules:
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Fluorine (F2)
Chlorine (Cl2)
Iodine (I2)
Bromine (Br2)
by Orly Termeie 3I
Thu Oct 08, 2015 11:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Subshell notation/number of orbitals
Replies: 1
Views: 318

Re: Subshell notation/number of orbitals

I believe the answers would be...
c. 6f and 7 orbitals
d. 2p and 3 orbitals
by Orly Termeie 3I
Thu Oct 08, 2015 11:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Clarification on the use of noble gases in configurations
Replies: 2
Views: 377

Re: Clarification on the use of noble gases in configuration

In class we went over both ways to co write the configurations: the long way and short way (with noble gases). So just to be safe, I would know how to write the electron configurations both ways. :)
by Orly Termeie 3I
Tue Oct 06, 2015 11:01 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 1
Views: 209

Rydberg Equation

Hello! On quizzes and exams will it be permitted to use the Rydberg equation-- frequency=R(1/nfinal^2 - 1/ninitial^2)? Thank you!
by Orly Termeie 3I
Sun Oct 04, 2015 10:10 pm
Forum: Significant Figures
Topic: Rounding when it comes to 5
Replies: 5
Views: 680

Re: Rounding when it comes to 5

I think we round to the nearest even number to keep all data consistent Thus, we do not always round up and instead round numbers depending on which even number is the closest. This keeps things balanced. In addition, even numbers are easier to divide so in later steps if we are required to divide b...
by Orly Termeie 3I
Sun Oct 04, 2015 9:34 pm
Forum: DeBroglie Equation
Topic: Conversion for DeBroglie Equation
Replies: 1
Views: 259

Re: Conversion for DeBroglie Equation

I believe we will be given the conversion factors on exams and quizzes; however, we should memorize the actual equations (DeBroglie, Heisenberg, etc).
by Orly Termeie 3I
Sun Oct 04, 2015 9:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Quizzes and Exams
Replies: 4
Views: 427

Re: Quizzes and Exams

Judging by the practice quizzes in the workbook, most of the questions require formulas and equations. However, understanding the reasoning for using formulas and learning about the processes will help.
by Orly Termeie 3I
Sun Oct 04, 2015 1:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework
Replies: 5
Views: 603

Re: Homework

The homework assignments can be found in the first few pages of the course reader and in the syllabus. In addition, the homework responses are due as we continue through a chapter. Homework questions are not collected, but it is highly recommended that you do the problems for practice. I recommend t...
by Orly Termeie 3I
Sat Oct 03, 2015 1:04 pm
Forum: DeBroglie Equation
Topic: E= pv and E=pc Question
Replies: 1
Views: 265

E= pv and E=pc Question

Hello! I just had a clarifying question: so you use the E=pv equation when you are finding the momentum or energy of anything other than light, correct? And you use the E=pc equation to calculate the energy or momentum of light? Thanks!
by Orly Termeie 3I
Wed Sep 30, 2015 10:56 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formulas and Rules for Figuring out their Names
Replies: 4
Views: 611

Re: Molecular Formulas and Rules for Figuring out their Name

Hi! In regards to naming compounds, the review in the course reader section is really helpful! Two main types of compounds are molecular and ionic, and each have their own rules for naming. For acids there are different formulas as well. In some practice problems in the textbook the formulas were gi...
by Orly Termeie 3I
Wed Sep 30, 2015 1:23 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer and Lyman series
Replies: 3
Views: 421

Balmer and Lyman series

Hello! Why is it that in the Balmer series n1=2, but in the Lyman series n1=1? What accounts for this difference? Thank You! :)
by Orly Termeie 3I
Sun Sep 27, 2015 12:44 am
Forum: Administrative Questions and Class Announcements
Topic: Homework
Replies: 5
Views: 603

Re: Homework

Do we have to read the entire chapter assigned for homework on top of the problems? I started reading Chapter 1 but it seems to cover a lot more information than I think we will cover in class. Do we have to read all 54 pages or just do the practice problems? I started the practice problems and rea...

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