Search found 130 matches

by ayushibanerjee06
Tue Feb 18, 2020 10:27 pm
Forum: Balancing Redox Reactions
Topic: 6K.1
Replies: 1
Views: 2

6K.1

For 6K.1 a), why is C oxidized from +2 to +1 when C2 is +4 in C2H5OH and C2 is +2 in C2H4O? Also, if both C and Cr go to lower oxidation states, how do you know which one is oxidized and reduced?
by ayushibanerjee06
Tue Feb 18, 2020 8:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 4
Views: 20

Test #2

Does anyone know what Test #2 will cover, especially since it is next week?
by ayushibanerjee06
Mon Feb 17, 2020 9:55 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5J.15
Replies: 4
Views: 15

Re: 5J.15

For 5J.15 part b), did anyone else get K=2.0*10^-18 for 273.15 K?
by ayushibanerjee06
Mon Feb 17, 2020 9:45 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5J.15
Replies: 4
Views: 15

5J.15

For 5J.15, why does the book say that 100 degrees Celsius is 423 Kelvins and not 373.15 Kelvins?
by ayushibanerjee06
Mon Feb 17, 2020 9:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 42
Views: 217

Re: Midterm Curve

I really wish but no, unfortunately ):
by ayushibanerjee06
Sat Feb 15, 2020 10:50 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equilibrium
Replies: 13
Views: 43

Re: Equilibrium

if you use the deltag=-nrtlnK equation, it will equal zero because, at equilibrium, K=1 and ln(1)=0.
by ayushibanerjee06
Sat Feb 15, 2020 9:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.21
Replies: 1
Views: 20

5G.21

For 5G.21, what am I doing wrong? The question is" Calculate the equilibrium constant at 25.8C for each of the following reactions, by using data in Appendix 2A: (a) the combustion of hydrogen: 2 H2(g) + O2(g) -> 2H2O(g) (b) the oxidation of carbon monoxide: 2CO(g)+O2(g) -> 2 CO2(g) For a) I us...
by ayushibanerjee06
Sat Feb 15, 2020 9:31 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Calculations
Replies: 1
Views: 19

Gibbs Free Energy Calculations

For Gibbs Free Energy Calculations, why don't you multiply the standard GFE you get when using the delta G = -RTlnK equation by the number of moles of the product? For example, in 5G.13, why don't you multiply -19124.75 kJ/mol by 2?
by ayushibanerjee06
Sat Feb 15, 2020 9:21 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G. 13
Replies: 4
Views: 38

Re: 5G. 13

Selena Yu 1H wrote:For G, I got -19.124 kJ instead of 19.33 kJ. You would use the equation G = -RTlnK to find what G is.


So, you use G=-RTlnK to find the standard GFE and not the ones in the back of the book?
by ayushibanerjee06
Sat Feb 15, 2020 9:19 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.15
Replies: 3
Views: 27

Re: 5G.15

Selena Yu 1H wrote:For 5G.15, for the standard GFE I got -12.35 kJ and for my final answer, I actually got -2.7 kJ/mol instead of -27 kJ/mol

How did you get -12.35 kJ? I used the one for NH3 in the back of the book that was -32.9 kJ/mol since the standard GFE for the reactants are zero.
by ayushibanerjee06
Sat Feb 15, 2020 7:52 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.15
Replies: 3
Views: 27

5G.15

For 5G.15, (a) Calculate the reaction Gibbs free energy of N2(g) 1 3 H2(g) S 2 NH3(g) when the partial pressures of N2, H2, and NH3 are 4.2 bar, 1.8 bar, and 21 bar, respectively, and the temperature is 400. K. For this reaction, K 5 41 at 400. K. (b) Indicate whether this reaction mixture is likely...
by ayushibanerjee06
Sat Feb 15, 2020 7:40 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G. 13
Replies: 4
Views: 38

5G. 13

Can someone find where my error is? The question is: (a) Calculate the reaction Gibbs free energy of I2(g) -> 2I(g) at 1200. K (K 5 6.8) when the partial pressures of I2 and I are 0.13 bar and 0.98 bar, respectively. (b) Indicate whether this reaction mixture is likely to form reactants, is likely t...
by ayushibanerjee06
Wed Feb 05, 2020 11:00 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4.33
Replies: 1
Views: 7

4.33

When do you use q=mcdeltat and when do you use enthalpy of combustion/formation to find energy?
by ayushibanerjee06
Wed Feb 05, 2020 10:43 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4.29
Replies: 1
Views: 16

4.29

Why do exothermic reactions need to be cooled to stay at a constant temperature?
by ayushibanerjee06
Wed Feb 05, 2020 10:21 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4.27
Replies: 1
Views: 5

4.27

For 4.27 part b), why does q change from 1.4x10^4 to 1.4x10^7?
by ayushibanerjee06
Wed Feb 05, 2020 9:13 pm
Forum: Phase Changes & Related Calculations
Topic: General Phase Change Calculations
Replies: 6
Views: 25

General Phase Change Calculations

For phase change questions, when do you know to start off with q=mcdeltaT to find the heat and when to use the Hvap etc.? For example, why do you use q=mcdeltaT first in question 4.1 where as in 4C.13 you use H=6.01 kJ/mol first?
by ayushibanerjee06
Wed Feb 05, 2020 12:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4D.7
Replies: 1
Views: 23

4D.7

The question is: Oxygen difluoride is a colorless, very poisonous gas that reacts rapidly and exothermically with water vapor to produce O2 and HF: OF2(g) + H2O(g) -> O2(g) + 2 HF(g) delta H = -318 kJ What is the change in internal energy for the reaction of 1.00 mol OF2? Why can’t you assume that n...
by ayushibanerjee06
Sun Feb 02, 2020 10:44 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 6
Views: 19

Bond Enthalpies

Why are bonds that are formed negative in bond enthalpy calculations?
by ayushibanerjee06
Sun Feb 02, 2020 10:42 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4A.7
Replies: 3
Views: 13

4A.7

For 4A.7 a), why do you add the q of water and copper?
by ayushibanerjee06
Thu Jan 30, 2020 9:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4B.9
Replies: 3
Views: 23

4B.9

The question says: In an adiabatic process, no energy is transferred as heat. Indicate whether each of the following statements about an adia- batic process in a closed system is always true, always false, or true in certain conditions (specify the conditions): (a) deltaU= 0; (b) q=0; (c) q < 0; (d)...
by ayushibanerjee06
Thu Jan 30, 2020 9:30 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4E.7
Replies: 1
Views: 18

4E.7

For the reaction: CH3CHCH2(g)+ 1H2O(g) -> CH3CH(OH)CH3(g)
I calculated that the bonds formed were: -7(c-h), -1 (c-c), -1(c=c), -2(o-h) and the bonds broken were: 6(c-h) + 2(o-h) + 1(c-c) + 1(c=c). I don't know why this is wrong.
by ayushibanerjee06
Wed Jan 29, 2020 9:02 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4D.3
Replies: 2
Views: 21

4D.3

The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113 8C to 22.799 8C. The calorimeter assembly is known to have a total heat capacity (calorimeter co...
by ayushibanerjee06
Tue Jan 21, 2020 11:46 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka*Kb=Kw
Replies: 5
Views: 25

Ka*Kb=Kw

For the Ka*Kb=Kw equation, does it make a difference if we say Kw=10^-4 or 1.0*10^-4?
by ayushibanerjee06
Mon Jan 20, 2020 8:42 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 33
Views: 120

Re: Kc vs Kp

You use Kp when all the products and reactants are gases and the question includes units like bar/atm/pa. You use Kc when the products and reactants are given in moles or molarity, even if the products and reactants are gases. If the question asks for Kp and the question only gives you information a...
by ayushibanerjee06
Mon Jan 20, 2020 8:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: When to ignore the second (de)protonization?
Replies: 5
Views: 27

Re: When to ignore the second (de)protonization?

You can ignore the Ka2 and Ka3 when they are much smaller in comparison the Ka1 and will no longer have an effect on the pH.
by ayushibanerjee06
Mon Jan 20, 2020 8:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Difference in PH between strong and weak acids
Replies: 11
Views: 52

Re: Difference in PH between strong and weak acids

Remember that having a higher pH value means that it is not very acidic since it is closer to neutral pH = 7. Because of this, weaker acids have higher pHs because they are deprotonating less. Strong acids disassociate 100%, but since weak acids do not, their pH tends to be higher.
by ayushibanerjee06
Mon Jan 20, 2020 8:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gas
Replies: 6
Views: 33

Re: Inert Gas

Although adding an inert gas affects the total volume of the reaction, they do not interact with anything, thus causing there to be no change in concentration.
by ayushibanerjee06
Mon Jan 20, 2020 8:32 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K value at a specific temp
Replies: 6
Views: 30

Re: K value at a specific temp

When the temperature is increased, K is higher. When the temperature is decreased, K is lower.
by ayushibanerjee06
Mon Jan 20, 2020 8:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure changes
Replies: 5
Views: 11

Re: Pressure changes

There will be no shift in the reaction.
by ayushibanerjee06
Mon Jan 20, 2020 3:54 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 6G.5
Replies: 1
Views: 17

6G.5

For the question: What is the concentration of hydronium ions in a solution that is 0.20 m NH2NH2(aq) and 0.30 m NaCl(aq), do we assume that [OH-] is 0.30 M and not [NH2NH3+]?
by ayushibanerjee06
Sat Jan 18, 2020 4:34 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Sessions
Replies: 2
Views: 17

Re: UA Sessions

Will there be UA sessions this Monday? Hi Ayushi, I had the same question! Unfortunately, I was told that there most likely will not because Office Hours and classes are not occurring on that day. If I hear anything else to the contrary, I will be sure to let you know! Good luck on the test :) -Reb...
by ayushibanerjee06
Sat Jan 18, 2020 4:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Fall Quarter Final
Replies: 2
Views: 25

Fall Quarter Final

When can we pick up our fall quarter final next week?
by ayushibanerjee06
Sat Jan 18, 2020 4:02 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Sessions
Replies: 2
Views: 17

UA Sessions

Will there be UA sessions this Monday?
by ayushibanerjee06
Sat Jan 18, 2020 4:01 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Buffer questions
Replies: 4
Views: 21

Buffer questions

Where can we find buffer questions to practice because none were assigned in the homework?
by ayushibanerjee06
Sat Jan 18, 2020 2:13 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.11
Replies: 2
Views: 21

Re: 6B.11

Please include the entire question with your post; this will better assist us in helping you The question is: A student added solid Na2O to a volumetric flask of volume 200.0 mL, which was then filled with water, resulting in 200.0 mL of NaOH solution. Then 5.00 mL of the solution was transferred t...
by ayushibanerjee06
Fri Jan 17, 2020 6:59 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.11
Replies: 2
Views: 21

6B.11

For 6B.11 a) ii), why do you multiply 0.18M by (500.0 ml/5.00 ml) and don't use the m1v1=m2v2 equation?
by ayushibanerjee06
Fri Jan 17, 2020 6:43 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6B.9
Replies: 1
Views: 14

6B.9

For 6B.9 i), when I solve for [OH-], I did Kw/[H3O+] (1.0x10^-14/1.50) and got 6.67x10^-15 instead of 1.50x10^-14. What am I doing wrong?
by ayushibanerjee06
Fri Jan 17, 2020 12:40 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6A.21
Replies: 2
Views: 24

6A.21

For 6A.21, why can you assume that [H3O+] and [OH-] are the same concentration?
by ayushibanerjee06
Thu Jan 16, 2020 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.35
Replies: 1
Views: 11

5.35

For 5.35, how do you determine the coefficients of A, B, and C from just looking at the graph? Also, why do you divide the partial pressure by 100 in the equilibrium constant?
by ayushibanerjee06
Mon Jan 13, 2020 3:05 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.9
Replies: 3
Views: 13

5J.9

Consider the equilibrium 3 NH3(g) + 5 O2(g) <-> 4 NO(g) + 6 H2O(g). (a) What happens to the partial pressure of NH3 when the partial pressure of NO is increased? (b) Does the partial pressure of O2 decrease when the partial pressure of NH3 is decreased? Can someone explain why both NH3 and O2 increa...
by ayushibanerjee06
Mon Jan 13, 2020 2:59 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.3
Replies: 5
Views: 22

5J.3

The question is: The four gases NH3, O2, NO, and H2O are mixed in a reaction vessel and allowed to reach equilibrium in the reaction 4 NH3(g) + 5 O2(g) <-> 4 NO(g) + 6 H2O(g). Why is there less NH3 when NO is removed?
by ayushibanerjee06
Mon Jan 13, 2020 2:52 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.1
Replies: 3
Views: 12

5J.1

The question is: Consider the equilibrium CO(g) + H2O(g) <->CO2(g) + H2(g). c) If the concentration of CO is increased, what happens to the concentra- tion of H2?
Can someone explain why?
by ayushibanerjee06
Sat Jan 11, 2020 4:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Thermodynamically Stable
Replies: 3
Views: 27

Thermodynamically Stable

For 5I.13, why is Cl2 more thermodynamically stable than F2?
by ayushibanerjee06
Sat Jan 11, 2020 3:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.1 [ENDORSED]
Replies: 4
Views: 25

5G.1 [ENDORSED]

Can someone explain why if you start with a higher pressure of reactant, the equilibrium constant will be larger?
by ayushibanerjee06
Sat Jan 11, 2020 1:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.13
Replies: 3
Views: 18

5I.13

For 5I.13 a) and b), should we use K or Kc?
by ayushibanerjee06
Sat Jan 11, 2020 1:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure Substance
Replies: 5
Views: 23

Re: Pure Substance

Their activities are actually 1, not 0.
by ayushibanerjee06
Sat Jan 11, 2020 1:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw 5I.1
Replies: 4
Views: 39

Re: Hw 5I.1

You do not have to create an ice table. I find that if they give you the equilibrium concentrations of the product(s) and all of the reactants except for the one they are asking about and vice versa, you should set up K and solve for the concentration for you are trying to find.
by ayushibanerjee06
Sat Jan 11, 2020 1:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: using Kp vs Kc
Replies: 13
Views: 34

Re: using Kp vs Kc

You can use both but as everyone else mentioned, make sure to pay attention if you are given atms or mols.
by ayushibanerjee06
Sat Jan 11, 2020 1:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5H.3
Replies: 4
Views: 29

5H.3

I am confused about how to do 5H.3 because I am unsure of how to start the problem since it combines two equations. How do I set it up?
by ayushibanerjee06
Sat Dec 07, 2019 7:27 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxoacid Strength
Replies: 6
Views: 50

Oxoacid Strength

Would HOF or HOCl be a stronger acid? Since oxoacid strength is based on electronegativity, shouldn't HOF be stronger than HOCl?
by ayushibanerjee06
Sat Dec 07, 2019 2:38 pm
Forum: Conjugate Acids & Bases
Topic: Amphiprotic v. amphoteric
Replies: 3
Views: 37

Re: Amphiprotic v. amphoteric

Also, what would be an example of a molecule that would be amphoteric but not amphiprotic?
by ayushibanerjee06
Sat Dec 07, 2019 2:36 pm
Forum: Conjugate Acids & Bases
Topic: Amphiprotic v. amphoteric
Replies: 3
Views: 37

Amphiprotic v. amphoteric

On the final, how would you show that a molecule is either amphiprotic or amphoteric through using reactions?
by ayushibanerjee06
Sat Dec 07, 2019 2:04 pm
Forum: Conjugate Acids & Bases
Topic: Acid/base reactions
Replies: 3
Views: 49

Acid/base reactions

I'm kind of confused about acid/base reactions. So acids are classified as electron pair acceptors (Lewis) and proton donors (Bronsted) and bases are classified as electron pair donors (Lewis) and proton acceptors (Bronsted). When we do chemical equations for proton transfer, I always get confused b...
by ayushibanerjee06
Fri Dec 06, 2019 4:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.63
Replies: 1
Views: 27

2.63

For 2.63, why is b), the OCO angle, less than 109.5 and not less than 120?
by ayushibanerjee06
Tue Dec 03, 2019 5:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Plane
Replies: 2
Views: 16

Plane

How do you determine if atoms are on the same plane? I never understood this topic
by ayushibanerjee06
Mon Dec 02, 2019 12:22 pm
Forum: General Science Questions
Topic: Practice Final
Replies: 3
Views: 77

Practice Final

Will there be a practice final similar to Dino Nuggets for the midterm?
by ayushibanerjee06
Mon Dec 02, 2019 11:36 am
Forum: Calculating the pH of Salt Solutions
Topic: 6D.11 F
Replies: 2
Views: 24

6D.11 F

Why does Cu(NO3)2 make the solution more basic? The reaction I got is Cu(NO3)2 + H20 -> CuO + H2(NO3)2
by ayushibanerjee06
Mon Dec 02, 2019 11:31 am
Forum: Calculating the pH of Salt Solutions
Topic: 6D.11 E
Replies: 1
Views: 24

6D.11 E

For 6D.11 E, why does AlCl3 affect the pH by making it more acidic? I got 2AlCl3 + 3H20 -> Al2O3 + 6HCl
by ayushibanerjee06
Mon Dec 02, 2019 11:29 am
Forum: Calculating the pH of Salt Solutions
Topic: 6D.11 c and d
Replies: 1
Views: 23

6D.11 c and d

For 6D.11 C, why can you keep the Fluoride in the chemical reaction when Halogens don't affect the pH? For D you ignore the Bromine because KBr keeps the pH neutral?
by ayushibanerjee06
Sun Dec 01, 2019 6:20 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: differences in acid/base strength
Replies: 1
Views: 28

differences in acid/base strength

Just for clarification, for acids and bases that have more than 2 atoms, we should look at which molecule has the more electronegative atom and if it has 2 atoms, we should look at the bond length? So, for 2+ atoms we look at the intermolecular forces and for 2 atoms we look at the intramolecular fo...
by ayushibanerjee06
Sun Dec 01, 2019 6:18 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: 6C.19
Replies: 1
Views: 16

6C.19

Why is HNO3 stronger than HNO2?
by ayushibanerjee06
Sun Dec 01, 2019 6:17 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: 6C.21
Replies: 2
Views: 21

6C.21

Why is formic acid stronger than acetic acid? I thought that acetic acid would be stronger because it has resonance.
by ayushibanerjee06
Sun Dec 01, 2019 5:45 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: concentrations greater than 1
Replies: 1
Views: 13

concentrations greater than 1

for H+ and OH- concentrations greater than 1, should we do log instead of -log?
by ayushibanerjee06
Sun Dec 01, 2019 5:39 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.9
Replies: 1
Views: 24

6B.9

For 6B.9 i), the H3O+ concentration is 1.50 M and when I do the pH of that I get a negative number. What am I doing wrong?
by ayushibanerjee06
Sun Dec 01, 2019 5:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.3
Replies: 2
Views: 27

Re: 6B.3

but part a) asks for the desired solution. 0.005 mol/0.2L is 0.025 M which is what you start with. same thing when you multiply 0.025 M * 0.25 L.
by ayushibanerjee06
Sun Dec 01, 2019 5:18 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.3
Replies: 2
Views: 27

6B.3

Can someone explain how to do 6B.3? The question is: A careless laboratory technician wants to prepare 200.0 mL of a 0.025 m HCl(aq) solution but uses a volumetric flask of volume 250.0 mL by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solu...
by ayushibanerjee06
Tue Nov 26, 2019 4:55 pm
Forum: Hybridization
Topic: plane
Replies: 2
Views: 22

plane

What does it mean for something to be in the same plane? I never really understood what this means and how to approach this question.
by ayushibanerjee06
Mon Nov 25, 2019 2:46 pm
Forum: Amphoteric Compounds
Topic: Bi2O3
Replies: 2
Views: 11

Bi2O3

Why is Bismuth Trioxide amphoteric?
by ayushibanerjee06
Mon Nov 25, 2019 2:45 pm
Forum: Amphoteric Compounds
Topic: As2O3
Replies: 2
Views: 40

As2O3

Why is Arsenic Trioxide amphoteric?
by ayushibanerjee06
Mon Nov 25, 2019 2:39 pm
Forum: Lewis Acids & Bases
Topic: SO3
Replies: 2
Views: 27

SO3

Why is SO3 a Lewis Acid?
by ayushibanerjee06
Sun Nov 24, 2019 7:23 pm
Forum: Naming
Topic: atoms outside of the coordination complex
Replies: 2
Views: 22

atoms outside of the coordination complex

should we put atoms/molecules that are outside of the coordination complex before the ligands when naming molecules? also, I remember Dr. Lavelle saying in lecture that we should put the ligands in alphabetical order and when I did the homework I put the ones that there were one of first and it was ...
by ayushibanerjee06
Sun Nov 24, 2019 6:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.63
Replies: 2
Views: 24

2.63

Why is the COO bond in Peroxyacetylnitrate 109.5 and not 120?
by ayushibanerjee06
Sun Nov 24, 2019 5:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.57
Replies: 1
Views: 14

2.57

What would you say the shape of CH3CN would be because the CH3 is tetrahedral, CN is linear, and the two Cs are in the same plane (180 degrees)? I know the hybridization of the C in CH3 is sp3 and the other C is sp and that there are 5 sigma and 2 pi bonds, but I don't know what this means.
by ayushibanerjee06
Sun Nov 24, 2019 5:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.45
Replies: 1
Views: 15

2.45

For 2.45, can someone explain what the answers for e) and f) would be? The question is: Consider the molecules H2CCH2, H2CCCH2, and H2CCCCH2. (a) Draw Lewis structures for these molecules. (b) What is the hybridization at each C atom? (c) What type of bond connects the carbon atoms (single, double, ...
by ayushibanerjee06
Thu Nov 21, 2019 6:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Bond Angles for Shapes with Lone Pairs
Replies: 5
Views: 45

VSEPR Bond Angles for Shapes with Lone Pairs

I just want to clarify the bond angles for VSEPR shapes with lone pairs. AX3E: trigonal pyramidal <109.5 AX3E2: t-shaped <90 AX4E: seesaw <90 and <120 AX4E2: square planar 90 (Doesn’t have a lone pair but just want to make sure) AX5: trigonal bipyramidal 90,120, and 180 AX5E: square pyramidal <90 (A...
by ayushibanerjee06
Wed Nov 20, 2019 3:29 pm
Forum: Bond Lengths & Energies
Topic: Boiling Points
Replies: 3
Views: 54

Boiling Points

Why does NO2 have a higher boiling point than N2O? I am confused because NO2 is a radical.
by ayushibanerjee06
Tue Nov 19, 2019 7:50 pm
Forum: Bond Lengths & Energies
Topic: Boiling Point
Replies: 7
Views: 77

Boiling Point

Does SiH4 or SiF4 have a higher boiling point?
by ayushibanerjee06
Mon Nov 18, 2019 3:19 pm
Forum: Hybridization
Topic: Hybridization and VSEPR
Replies: 1
Views: 17

Hybridization and VSEPR

Is hybridization based on molecular geometry or electronic arrangement? I am still kind of confused about the difference between these two
by ayushibanerjee06
Mon Nov 18, 2019 3:07 pm
Forum: Hybridization
Topic: 2F.15
Replies: 2
Views: 23

2F.15

Can someone explain 2F.15? The question is: Noting that the bond angle of an sp3 hybridized atom is 109.5 and that of an sp2 hybridized atom is 120, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased? I thought that it woul...
by ayushibanerjee06
Fri Nov 15, 2019 5:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29 B
Replies: 1
Views: 22

2E.29 B

There are three isomers of dichlorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ring. (a) Which of the three forms are polar? (b) Which has the largest dipole moment? Can someone explain b? I thought the dipole moment depends on the distance between t...
by ayushibanerjee06
Fri Nov 15, 2019 5:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: C2H4
Replies: 3
Views: 27

C2H4

can someone explain c2h4's shape and bond angles? I don't understand why it is 120 degrees
by ayushibanerjee06
Fri Nov 15, 2019 5:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.19 C and D
Replies: 1
Views: 16

2E.19 C and D

Predict the shapes and estimate the bond angles of (a) the thiosulfate ion, S2O3-2; (b) (CH3)2Be; (c) BH2- ; (d) SnCl2.

Why are c and d less than 120? I thought they were less than 109.5
by ayushibanerjee06
Fri Nov 15, 2019 5:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.17 D
Replies: 1
Views: 19

2E.17 D

Can someone explain 2E.17 D?
The question is: Predict the bond angles at the central atom of the following molecules and ions: (a) ozone, O3; (b) azide ion, N32; (c) cyanate ion, CNO2; (d) hydronium ion, H3O+
by ayushibanerjee06
Fri Nov 15, 2019 5:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.17 B
Replies: 2
Views: 18

2E.17 B

Can someone explain 2E.17 b)? The question is: Predict the bond angles at the central atom of the following molecules and ions: (a) ozone, O3; (b) azide ion, N32; (c) cyanate ion, CNO2; (d) hydronium ion, H3O1. When I draw the structure I get a lone pair on the central N so I thought it would be les...
by ayushibanerjee06
Mon Nov 11, 2019 10:34 am
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 142

Re: Test 2

Elizabeth Johnson 1I wrote:This is semi-related but the final will be cumulative rather than just the 2nd half of the course, right?


yup
by ayushibanerjee06
Sun Nov 10, 2019 3:56 pm
Forum: Administrative Questions and Class Announcements
Topic: UA Workshops 11/11
Replies: 2
Views: 31

UA Workshops 11/11

Will there still be UA workshops tomorrow?
by ayushibanerjee06
Sun Nov 10, 2019 3:52 pm
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 142

Re: Test 2

Jamie Hwang 3H wrote:I'm kind of confused on what will be on the test. Will the test go over polarizability and dipole moments because that wasn't really on the midterm?

i assume so
by ayushibanerjee06
Fri Nov 08, 2019 9:09 am
Forum: General Science Questions
Topic: Test 2
Replies: 20
Views: 142

Test 2

Is the second test cumulative?
by ayushibanerjee06
Thu Nov 07, 2019 8:05 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F.5 B
Replies: 1
Views: 19

3F.5 B

Why does C4H9OH have a higher melting point than C2H5OC2H5? And why does CHI3 have a higher melting point than CHF3?
by ayushibanerjee06
Wed Nov 06, 2019 10:54 am
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4408

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer. i think they used the wrong mass of an electron because when i went to the review session th...
by ayushibanerjee06
Wed Nov 06, 2019 10:33 am
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4408

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

For 6b., I am confused about why GarBreadium has the longer deBroglie wavelength. Shouldn't it be He because it weighs more?
by ayushibanerjee06
Tue Nov 05, 2019 10:00 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: polarizability/polarizing power and periodicity
Replies: 2
Views: 18

polarizability/polarizing power and periodicity

does polarizability and polarizing power relate to electronegativity and electron affinity? like do ions with high polarizability have a higher electron affinity and atomic radius? and do ions with a strong polarizing power have a low electron affinity, electronegativity, and small atomic radius?
by ayushibanerjee06
Tue Nov 05, 2019 12:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: +/- speed
Replies: 3
Views: 46

Re: +/- speed

nicolely3B wrote:You multiply the value by 2 to get the total margin of uncertainty in velocity. So you use ∆V = 10 m/s to solve this.


the uncertainty is always multiplied by two because you do the largest-the smallest
by ayushibanerjee06
Mon Nov 04, 2019 1:58 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4408

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

For 2a in Mini Dino Nuggets, do you need to draw partial positives on the hydrogens?
by ayushibanerjee06
Sat Nov 02, 2019 11:31 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4408

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Will they be posted? pls help us out
by ayushibanerjee06
Sat Nov 02, 2019 11:29 pm
Forum: Dipole Moments
Topic: Dipole Moments on Lewis Structures
Replies: 2
Views: 27

Dipole Moments on Lewis Structures

How do you draw dipole moments on Lewis Structures? For example, how would you draw the dipole moments on CH3F and CH3Br's Lewis Structures?
by ayushibanerjee06
Thu Oct 31, 2019 8:00 pm
Forum: Electronegativity
Topic: 2D.1
Replies: 4
Views: 41

2D.1

Can someone explain 2D.1?
Place the following elements in order of increasing electronegativity: antimony, tin, selenium, and indium.

I thought it was tin<antimony<tellurium<selenium
by ayushibanerjee06
Thu Oct 31, 2019 5:59 pm
Forum: Electronegativity
Topic: 2D.3
Replies: 2
Views: 33

2D.3

For 2D.3, doesn't BeBr3 have primarily ionic bonds?
by ayushibanerjee06
Thu Oct 31, 2019 5:43 pm
Forum: Octet Exceptions
Topic: 2C.9
Replies: 4
Views: 35

Re: 2C.9

Sorry, I meant 2C.11 part c

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