Search found 124 matches

by Riya Sood 4G
Sun Feb 16, 2020 10:44 am
Forum: Balancing Redox Reactions
Topic: Balancing redox reactions [ENDORSED]
Replies: 1
Views: 13

Balancing redox reactions [ENDORSED]

Do the charges on both sides have to be equal when balancing redox reactions?
by Riya Sood 4G
Sat Feb 15, 2020 4:03 pm
Forum: Balancing Redox Reactions
Topic: Homework 6K.3 part c
Replies: 2
Views: 10

Homework 6K.3 part c

Balance each of the following skeletal equations by using oxidation and reduction half-reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction. How is the Cl2 the oxidizing agent in part c? (c) Reaction of hydrosulfuric acid with c...
by Riya Sood 4G
Tue Feb 11, 2020 6:58 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: 5
Views: 23

Residual Entropy

How can we define residual entropy? And what does it tell us?
by Riya Sood 4G
Tue Feb 11, 2020 6:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for delta H
Replies: 1
Views: 9

Units for delta H

When is delta H written as KJ/mol and when is it written as KJ?
by Riya Sood 4G
Tue Feb 11, 2020 1:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal energy of ideal gas
Replies: 4
Views: 16

Internal energy of ideal gas

Is the internal energy of an ideal gas 0 at constant temperature?
by Riya Sood 4G
Mon Feb 10, 2020 9:50 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Extensive and State properties
Replies: 3
Views: 11

Extensive and State properties

Are state properties also considered to be extensive properties ? Is there any correlation between the two concepts ?
by Riya Sood 4G
Mon Feb 10, 2020 6:34 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U = 0
Replies: 2
Views: 10

Re: delta U = 0

Delta U= 0 during an isothermal reaction where temperature is constant. As such, the heat absorbed = work done on the surroundings.
by Riya Sood 4G
Sat Feb 08, 2020 8:57 am
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of a combustion reaction?
Replies: 7
Views: 22

Enthalpy of a combustion reaction?

Is Delta H positive or negative for a combustion reaction?
by Riya Sood 4G
Wed Feb 05, 2020 1:43 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Question 4.37
Replies: 2
Views: 13

Question 4.37

Under what conditions, if any, does the sign of each of the
following quantities provide a criterion for assessing the spontaneity of a reaction? (a) DeltaG; (b) DeltaH; (c) DeltaS(system); (d) DeltaS(tot).

What is the answer to part (c) and (d) ?
by Riya Sood 4G
Wed Feb 05, 2020 1:01 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Molar Entropy
Replies: 4
Views: 24

Molar Entropy

What is molar entropy? What is it telling us ?
by Riya Sood 4G
Wed Feb 05, 2020 12:38 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Thermodynamically stable/unstable
Replies: 2
Views: 25

Thermodynamically stable/unstable

If a compound is thermodynamically unstable, does it decompose into its constituent elements?
by Riya Sood 4G
Tue Feb 04, 2020 12:41 pm
Forum: Calculating Work of Expansion
Topic: Identifying constant pressure in a question
Replies: 3
Views: 10

Identifying constant pressure in a question

What are some key indicators in a question to identify whether pressure is constant or not to calculate the work when the question does not explicitly use the words "constant external pressure"?
by Riya Sood 4G
Sun Feb 02, 2020 5:55 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Changes in pressure
Replies: 2
Views: 21

Changes in pressure

4H.1 Which substance in each of the following pairs has the higher molar entropy at 298 K: (a) HBr(g) or HF(g); (b) NH3(g) or Ne(g); (c) I2(s) or I2(l); (d) 1.0 mol Ar(g) at 1.00 atm or 1.0 mol Ar(g) at 2.00 atm? For part (d), why does a lower pressure result in a higher entropy? The answer key stat...
by Riya Sood 4G
Sun Feb 02, 2020 4:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy units
Replies: 5
Views: 15

Enthalpy units

When calculating enthalpies, using Hess's Law, do we use the units kj to denote delta H?
by Riya Sood 4G
Sun Feb 02, 2020 11:25 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Phase change
Replies: 20
Views: 47

Phase change

is the delta H positive or negative when ice turns to liquid?
by Riya Sood 4G
Sun Feb 02, 2020 8:25 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Expansion
Replies: 2
Views: 16

Re: Reversible Expansion

Reversible expansion means when we increase the volume of an ideal gas in very small amounts at a constant temperature. Also the external pressure is approximately equal to pressure inside the system in a reversible expansion. I am guessing we should know how to solve the integral since it is part o...
by Riya Sood 4G
Sun Feb 02, 2020 8:21 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Affect of temperature on entropy?
Replies: 5
Views: 22

Affect of temperature on entropy?

Does increasing the temperature, increase or decrease the entropy of a system? Since increasing the temperature should put the molecules in an excited state to move around more freely
by Riya Sood 4G
Sun Feb 02, 2020 8:19 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 1
Views: 16

Re: Entropy

Gasses have the largest entropy because they can exist in many microstates. Molecules in a liquid and solid can move around less and are more rigidly bound. Therefore, they have lower entropy compared to gasses. When there is a phase change, going from solid to liquid and liquid to gas, always incre...
by Riya Sood 4G
Tue Jan 28, 2020 8:36 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 11
Views: 34

Bond Enthalpies

Why is calculating enthalpy from bond enthalpies considered to be not as efficient as other methods?
by Riya Sood 4G
Mon Jan 27, 2020 6:47 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Units for temperature?
Replies: 11
Views: 27

Units for temperature?

When calculating from the specific heat capacity using the formula q=C(m) (delta T), do we use units for temperature as degree celsius or Kelvin?
by Riya Sood 4G
Sun Jan 26, 2020 11:33 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy from DSC curves
Replies: 1
Views: 18

Enthalpy from DSC curves

Do we have to calculate enthalpy from DSC curves?
by Riya Sood 4G
Sun Jan 26, 2020 11:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Signs for enthalpy
Replies: 8
Views: 16

Signs for enthalpy

Are enthalpies always expressed as positive? Can they ever be negative?
by Riya Sood 4G
Sun Jan 26, 2020 5:53 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: HW 4A.7
Replies: 2
Views: 46

Re: HW 4A.7

For this question, we need to take into account both the mass of the water and copper and calculate the heat required (q) for both of them and add it together. Your equation should be set up as: (400g)(4.18 J/cg)(100-22C)+ (500g) (0.38 J/Cg)(100-22C)= 1.4 x 10^2 KJ. In the solutions manual, they con...
by Riya Sood 4G
Sun Jan 26, 2020 5:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 6
Views: 14

Bond Enthalpies

Will we have to draw the Lewis structure to calculate the bond enthalpies or they were just used as an example in lecture?
by Riya Sood 4G
Sun Jan 26, 2020 5:45 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: pH of a buffer solution calculation
Replies: 3
Views: 29

Re: pH of a buffer solution calculation

PranaviKolla2B wrote:How do we calculate the pH of a buffer solution? Are there any good videos explaining this?



We only have to calculate the pH based on the ice table example used in the notes.
by Riya Sood 4G
Sun Jan 26, 2020 5:43 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: delta H and delta U
Replies: 2
Views: 9

delta H and delta U

How are the delta H and delta U connected for reactions with ideal gasses?
by Riya Sood 4G
Sun Jan 26, 2020 5:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Types of Delta H
Replies: 3
Views: 15

Re: Types of Delta H

Delta Hc with the degree sign refers to the standard enthalpy of combustion.
by Riya Sood 4G
Tue Jan 21, 2020 9:29 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Homework 6C.5
Replies: 2
Views: 29

Homework 6C.5

6C.5 Write the chemical formula for the conjugate base of formic
acid, HCOOH and calculate its pKb from the pKa of formic acid
(see Table 6C.1).

what is the answer to this problem? Cannot find it in the solutions manual
by Riya Sood 4G
Mon Jan 20, 2020 3:01 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: pH of a buffer solution calculation
Replies: 3
Views: 29

pH of a buffer solution calculation

Do we have to use the Henderson-Hasselbach Equation when calculating the pH of a buffer solution? or we just use the ICE table ?
by Riya Sood 4G
Sun Jan 19, 2020 10:12 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Priciple
Replies: 4
Views: 12

Le Chatelier's Priciple

Does adding a liquid or solid to a reaction at equilibrium affect the concentrations of the reactants or products?
by Riya Sood 4G
Sun Jan 19, 2020 7:38 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Titration
Replies: 2
Views: 9

Titration

What does an equivalence point tell us about a titration?
by Riya Sood 4G
Fri Jan 17, 2020 1:46 pm
Forum: Phase Changes & Related Calculations
Topic: 4A. 1 Identifying open and closed system
Replies: 11
Views: 70

4A. 1 Identifying open and closed system

1. Identify the following systems as open, closed, or isolated: (a) coffee in a very-high-quality thermos bottle; (b) coolant in a refrigerator coil; (c) a bomb calorimeter in which benzene is burned; (d) gasoline burning in an automobile engine; (e) mercury in a thermometer; (f) a living plant. How...
by Riya Sood 4G
Thu Jan 16, 2020 7:23 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: rearranging for quadratic
Replies: 3
Views: 24

Re: rearranging for quadratic

The way to ensure that you get -4.92, is by first simplifying the denominator. Once you do that you can multiply to the 0.56 (Kc value). At this point you should be at -3.92. And then we would subtract the equation we get from 3+x. And then -3.92-1= -4.92

Hope this helps.
by Riya Sood 4G
Thu Jan 16, 2020 7:16 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Acids and Bases, understanding the Ka value
Replies: 3
Views: 19

Acids and Bases, understanding the Ka value

Does a large Ka value mean that that the acid is more stable or unstable?
by Riya Sood 4G
Wed Jan 15, 2020 11:22 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6D.15
Replies: 1
Views: 35

6D.15

Calculate the pH of (a) 0.19 m NH4Cl(aq); (b) 0.055 m
AlCl3(aq).

How do we do part b of this question? What will be the dissociation reaction?
by Riya Sood 4G
Tue Jan 14, 2020 10:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Chart
Replies: 5
Views: 19

Re: ICE Chart

One possible way to tell is if they gave us the concentrations of products. Then we assume that reactants would be formed and the reverse reaction would take place. Also if Q is given, then we can compare it to the K and see which direction the reaction would proceed in.
by Riya Sood 4G
Tue Jan 14, 2020 10:43 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6A.19
Replies: 1
Views: 24

Re: 6A.19

This happens because the answer key is using the 6th edition of the textbook where the value of H3O+ is 3.2 mmol/L. But in the 7th edition of the textbook the value is 3.2 mol/L. This is why the answer key gives 3.2 x10^-3 in the denominator.
by Riya Sood 4G
Thu Jan 09, 2020 9:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.15
Replies: 1
Views: 19

Re: 5I.15

Yes the denominator will just be 1. This is because the reactant is a solid and we do not include solids and liquids in our calculations for the equilibrium constants.
by Riya Sood 4G
Thu Jan 09, 2020 9:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing K and Q Values
Replies: 4
Views: 23

Re: Graphing K and Q Values

In class he showed us three bar graphs that compared K and Q. When the bar for Q was higher than K (Q>K), we assume that the reaction favors formation of reactants. When the bar for K and Q are equal (K=Q), than the reaction is considered to be at equilibrium. Lastly, when the Q is a smaller bar tha...
by Riya Sood 4G
Thu Jan 09, 2020 9:45 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Effect of Inert Gases
Replies: 9
Views: 29

Effect of Inert Gases

When do inert gases have no effect on the equilibrium reaction?
by Riya Sood 4G
Wed Jan 08, 2020 5:39 pm
Forum: Ideal Gases
Topic: Units for Pressure
Replies: 6
Views: 44

Units for Pressure

What units for pressure do we use when calculating using the formula, pv=nRT? Is it bar or atm?
by Riya Sood 4G
Tue Jan 07, 2020 8:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question from Module Assessment Part 1A
Replies: 3
Views: 20

Question from Module Assessment Part 1A

Why are equilibrium constants useful? A. One number that gives us information about the relative concentrations of reactant and product. B. One number that gives us information about the relative production rates of reactant and product. C. One number that gives us information about the relative act...
by Riya Sood 4G
Mon Jan 06, 2020 11:24 pm
Forum: Ideal Gases
Topic: Dynamic Equilibrium
Replies: 10
Views: 55

Re: Dynamic Equilibrium

Also remember that when a system is at dynamic equilibrium, its composition stays the same.
by Riya Sood 4G
Sun Dec 08, 2019 8:13 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Equilibrium sign
Replies: 4
Views: 52

Equilibrium sign

Do we add the equilibrium sign if we are writing the dissociation of a strong acid/strong base ?
by Riya Sood 4G
Sun Dec 08, 2019 12:38 am
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 61

Re: Options to reduce acid rain

Acid rain can be reduced by reducing burning of fossil fuels. Also, neutralizers like limestone can be used
by Riya Sood 4G
Sat Dec 07, 2019 12:13 pm
Forum: Naming
Topic: Adding the word ion
Replies: 1
Views: 17

Adding the word ion

When do we add the word "ion" to the end?
by Riya Sood 4G
Sat Dec 07, 2019 11:47 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond order
Replies: 2
Views: 31

Bond order

What is the formula for bond order and what is the bond order of Cl2?
by Riya Sood 4G
Fri Dec 06, 2019 9:49 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Atoms in the same plane
Replies: 1
Views: 18

Atoms in the same plane

How can we determine which atoms are in the same plane and which can undergo rotation ?
by Riya Sood 4G
Thu Dec 05, 2019 6:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polarity
Replies: 2
Views: 21

Determining Polarity

Is T shape polar or nonpolar?
by Riya Sood 4G
Thu Dec 05, 2019 5:25 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen Bonding
Replies: 2
Views: 15

Hydrogen Bonding

How many hydrogen bonding sites can H2O form? Do the 2Hs also act as potential hydrogen bonding sites ?
by Riya Sood 4G
Tue Dec 03, 2019 10:55 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 24

Re: Naming

It also helps to draw out the lewis structures to help associate them with the names of ligands and remember their charge.
by Riya Sood 4G
Tue Dec 03, 2019 10:52 pm
Forum: Biological Examples
Topic: Coordination Compounds in relation to Chemotherapy
Replies: 2
Views: 25

Re: Coordination Compounds in relation to Chemotherapy

It is important to know that cisplatnin is a chemotherapy drug. It forms a coordination bond with DNA which stops cell division since the Cls are on the same side in a cis compound.
by Riya Sood 4G
Tue Dec 03, 2019 10:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Rotations
Replies: 1
Views: 21

Rotations

How can we determine which atoms stay in the same plane in a compound?
by Riya Sood 4G
Tue Dec 03, 2019 10:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 17

Coordination Number

Do we have to take into account the lone pair electrons when finding the coordination number ? for instance, what is the coordination number for the shape triagonal pyramidal?
by Riya Sood 4G
Sun Dec 01, 2019 10:41 pm
Forum: Hybridization
Topic: Hybridization Order
Replies: 2
Views: 17

Re: Hybridization Order

Yes the s orbital comes before the p orbital. But I don't believe that the order matters. For instance, both dsp^3 and sp^3d are considered the same thing.
by Riya Sood 4G
Sun Dec 01, 2019 10:37 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Bond strength and strength of acid.
Replies: 6
Views: 30

Bond strength and strength of acid.

How does the bond strength play a role in determining the strength of the acid? Is there a trend?
by Riya Sood 4G
Sun Dec 01, 2019 10:34 pm
Forum: Polyprotic Acids & Bases
Topic: Oxoacids Trends
Replies: 1
Views: 27

Re: Oxoacids Trends

Increasing the number of oxygens increases the strength of the acidity because the additional O helps to pull out the atom easily. For example in HClO2 and HClO, the extra oxygen of HClO2 makes it stronger and easier to pull out the H atom from the H-O bond. Also, the oxidation state of the Cl is gr...
by Riya Sood 4G
Sun Dec 01, 2019 10:28 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6D.11
Replies: 1
Views: 40

6D.11

Decide whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH . 7
or pH , 7, write a chemical equation to justify your answer.
(a) NH4Br; (b) Na2CO3; (c) KF; (d) KBr; (e) AlCl3; (f) Cu(NO3)2.


How do we solve this problem?
by Riya Sood 4G
Sun Dec 01, 2019 8:13 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Mondentate/Bidentate
Replies: 1
Views: 17

Mondentate/Bidentate

How is H20 (water) both monodentate and bidentate?
by Riya Sood 4G
Thu Nov 28, 2019 6:15 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: calculating pKa and pKb
Replies: 2
Views: 35

calculating pKa and pKb

Write the chemical formula for the conjugate acid of the base pyridine,
C5H5N, and calculate its pKa from the pKb for pyridine.

How do we solve this problem?
by Riya Sood 4G
Thu Nov 28, 2019 2:54 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Value of pH
Replies: 8
Views: 41

Value of pH

Can the value of pH every be negative ?
by Riya Sood 4G
Wed Nov 27, 2019 8:47 pm
Forum: Naming
Topic: Naming coordination compound
Replies: 3
Views: 29

Naming coordination compound

Does the placement of the ligands matter when going from the name of the coordinate compound to the formula? How do we know which ligand comes first after the metal?
by Riya Sood 4G
Tue Nov 26, 2019 1:18 pm
Forum: Naming
Topic: Naming coordination compound
Replies: 5
Views: 49

Naming coordination compound

What is the name of the coordinate compound [Fe(en)₂(NO₂)₂]SO₄ ?
by Riya Sood 4G
Sun Nov 24, 2019 7:06 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 28

Naming

Is there a formula to follow while naming coordination compounds that tells us what comes first and so on?
by Riya Sood 4G
Sun Nov 24, 2019 10:08 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 31

Coordination Number

Do en and edta always result in 6 coordination numbers?
by Riya Sood 4G
Sun Nov 24, 2019 9:01 am
Forum: Naming
Topic: Naming coordination compound
Replies: 1
Views: 24

Naming coordination compound

What is the name of the coordination compound: [Co(NH3)6]Cl2 ?
by Riya Sood 4G
Fri Nov 22, 2019 10:09 am
Forum: Hybridization
Topic: 2F.15
Replies: 2
Views: 21

2F.15

How does increasing the s character, increase the bond angle?
by Riya Sood 4G
Wed Nov 20, 2019 9:29 am
Forum: Dipole Moments
Topic: Hydrogen Bonds
Replies: 3
Views: 27

Hydrogen Bonds

How do we create hydrogen bonds from a given figure? Is it the just the regions where atoms such F, O, and N are located ?
by Riya Sood 4G
Tue Nov 19, 2019 12:08 pm
Forum: Dipole Moments
Topic: Polar or nonpolar
Replies: 8
Views: 67

Polar or nonpolar

Is 02 polar or nonpolar ?
by Riya Sood 4G
Tue Nov 19, 2019 11:53 am
Forum: Bond Lengths & Energies
Topic: Boiling point
Replies: 11
Views: 76

Boiling point

How does the molar mass relate to the boiling point?
by Riya Sood 4G
Tue Nov 19, 2019 11:39 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Shape
Replies: 6
Views: 33

Linear Shape

Are linear shapes always nonpolar ? are there any exceptions?
by Riya Sood 4G
Mon Nov 18, 2019 12:16 am
Forum: Dipole Moments
Topic: Intermolecular Forces
Replies: 1
Views: 17

Intermolecular Forces

What are all the intermolecular forces that we need to know?
by Riya Sood 4G
Sun Nov 17, 2019 9:48 pm
Forum: Dipole Moments
Topic: Effects for boiling point
Replies: 5
Views: 27

Effects for boiling point

How is the boiling point affected by the intermolecular forces? What is the trend?
by Riya Sood 4G
Sun Nov 17, 2019 9:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 3
Views: 23

VSEPR Model

Do we have to memorize the molecular shapes and bond angles for the test or will be we given a chart?
by Riya Sood 4G
Sun Nov 17, 2019 9:29 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 5
Views: 24

VSEPR Model

What is the difference between electron arrangement and molecular shape?
by Riya Sood 4G
Sat Nov 16, 2019 8:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 2
Views: 40

VSEPR Model

What is the shape of the IO2F2- and what is the lewis structure ?
by Riya Sood 4G
Sat Nov 16, 2019 7:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 7
Views: 31

VSEPR Formula

Do we account for lone pairs electrons when finding the molecular shape?
by Riya Sood 4G
Wed Nov 13, 2019 10:12 am
Forum: Dipole Moments
Topic: 3F. 7
Replies: 1
Views: 19

3F. 7

Which should have a higher boiling point: SO2 or O3?
by Riya Sood 4G
Wed Nov 13, 2019 9:47 am
Forum: Dipole Moments
Topic: 3F.1
Replies: 2
Views: 35

3F.1

How does NH2OH have London forces and dipole-dipole interactions?
by Riya Sood 4G
Tue Nov 12, 2019 8:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Bond Angle
Replies: 1
Views: 14

Determining Bond Angle

How do we determine the bond angle from the shape ?
by Riya Sood 4G
Mon Nov 11, 2019 7:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 3
Views: 24

VSEPR Model

Is there a way to figure out the VSEPR model shape without drawing out the Lewis Structure ?
by Riya Sood 4G
Thu Nov 07, 2019 10:42 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Intermolecular Forces 3F
Replies: 1
Views: 23

Intermolecular Forces 3F

3. F, 5) Suggest, giving reasons, which substance in each of the following pairs is likely to have the higher normal melting point (Lewis structures may help your arguments): (a) HCl or NaCl; (b) C2H5OC2H5 (diethyl ether) or C4H9OH (butanol); (c) CHI3 or CHF3; (d) C2H4 or CH3OH. How do we solve this...
by Riya Sood 4G
Wed Nov 06, 2019 2:16 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 3
Views: 46

Dipole Moment

Do dipole moments exist even when there is 0 Formal Charge?
by Riya Sood 4G
Tue Nov 05, 2019 8:21 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Module Question
Replies: 2
Views: 36

Heisenberg Uncertainty Module Question

You are caught in a radar trap and hope to show that the speed measured by the radar gun is in error due to the Heisenberg uncertainty principle. If you assume that the uncertainty in your position was +/- 5 m when your speed was measured, and that the car has a mass of 2150 kg, what is your calcula...
by Riya Sood 4G
Tue Nov 05, 2019 7:45 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Module Question
Replies: 2
Views: 38

Heisenberg Uncertainty Module Question

. For large everyday objects does Heisenberg's uncertainty (indeterminacy) principle play any measurable role?
What is the answer and why?
by Riya Sood 4G
Tue Nov 05, 2019 7:39 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty in Position
Replies: 4
Views: 57

Heisenberg Uncertainty in Position

If we are given the delta x as +/- 5, do we multiply by 2 ?
by Riya Sood 4G
Mon Nov 04, 2019 10:35 am
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 4
Views: 33

Lewis Structure

How to chose the central atom when drawing Lewis Structures?
by Riya Sood 4G
Mon Nov 04, 2019 10:29 am
Forum: Ionic & Covalent Bonds
Topic: C, N, O, and F
Replies: 13
Views: 94

C, N, O, and F

Do C, N, O, and F always follow the octet guideline even if their formal charge is not 0?
by Riya Sood 4G
Sun Nov 03, 2019 11:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Principle
Replies: 1
Views: 33

Uncertainty Principle

To calculate the delta v, we multiply the +/- part by 2 right?
by Riya Sood 4G
Sun Nov 03, 2019 7:35 pm
Forum: Properties of Light
Topic: Focus 1.3
Replies: 2
Views: 30

Focus 1.3

In each second, a certain lamp produces 2.4 x 10^21 photons
with a wavelength of 633 nm. How much power (in watts) is produced as radiation at this wavelength (1W=1 J/s)?

What is the answer and how do we solve this problem?
by Riya Sood 4G
Sun Nov 03, 2019 6:06 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 2
Views: 13

Ionization Energy

Are there any exceptions to the ionization energy trend in the periodic table? Does it always increase from left to right?
by Riya Sood 4G
Sun Nov 03, 2019 6:06 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 2
Views: 10

Ionization Energy

Which has a lower ionization energy Oxygen or Nitrogen? Why?
by Riya Sood 4G
Sun Nov 03, 2019 12:39 pm
Forum: Electronegativity
Topic: Ionic or covalent?
Replies: 17
Views: 109

Ionic or covalent?

How do we figure out if the compound is ionic or covalent without looking at the electronegativity?
by Riya Sood 4G
Sun Nov 03, 2019 12:33 pm
Forum: Resonance Structures
Topic: Delocalized electrons
Replies: 2
Views: 19

Delocalized electrons

What does it mean to be delocalized electrons?
by Riya Sood 4G
Sun Nov 03, 2019 8:45 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s and d orbital
Replies: 1
Views: 13

s and d orbital

In what instances does the s orbital have lower energy than the d orbital and when does d orbital have lower energy than s orbital?
by Riya Sood 4G
Sat Nov 02, 2019 9:57 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles and Molar Mass
Replies: 2
Views: 45

Moles and Molar Mass

What is atomic weight and molecular weight ? and do we have to calculate them? How?
by Riya Sood 4G
Wed Oct 30, 2019 12:17 am
Forum: Resonance Structures
Topic: 2B. 3
Replies: 2
Views: 21

2B. 3

What is the answer for part c and d in 2B.3?
We had to draw resonance structures for c)SiO2 and d)BrF3?
by Riya Sood 4G
Mon Oct 28, 2019 10:36 am
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 2
Views: 33

Lewis Structure

Can we ever have a single unpaired electron on a Lewis Structure ?
by Riya Sood 4G
Sun Oct 27, 2019 7:29 pm
Forum: Resonance Structures
Topic: Lewis Structures for Resonance
Replies: 4
Views: 22

Lewis Structures for Resonance

Is there always an octet formed for Lewis Structures of atoms with resonance ?
by Riya Sood 4G
Sun Oct 27, 2019 1:58 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 4
Views: 32

Valence Electrons

When counting the valence electrons for elements in Group 3-12, do we count the d orbital electrons also?

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