## Search found 21 matches

Sat Mar 12, 2016 10:15 pm
Forum: *Aldehydes
Topic: Q7E from 2014 final
Replies: 1
Views: 790

### Q7E from 2014 final

This part says to draw the newman digram for 3-chloro-4,4,4-trihydroxy-3-methylbutanenitrile. I was wondering how you know that it is a gauche and not anti.
Wed Mar 09, 2016 6:15 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Question 7C from Final 2011
Replies: 1
Views: 302

### Question 7C from Final 2011

The question asks to draw a line structure for 4-methyl-3-heptanone. I was wondering where the oxygen atom came from. Is it from the heptanone?
Sat Mar 05, 2016 1:24 pm
Forum: *Alkanes
Topic: Numbering
Replies: 2
Views: 323

### Numbering

While solving a bunch of the line structures for different molecules, I was confused as to which ones take priority. Do the double bonds take priority over the substituents? If there is just one double bond how would we name that?
Sun Feb 28, 2016 5:32 pm
Forum: *Alkanes
Replies: 1
Views: 264

While looking at the course reader again after lecture, I was still confused about intermediates. I wasn't sure how you can tell which one is the intermediate when there is a reaction. It states for ste 1: Ch3Ch=ChCh3 +Hbr ---> Ch3ChCh2Ch3 +Br-. They say ch3chch2ch3 is the intermediate.
Sun Feb 28, 2016 5:30 pm
Forum: *Alkanes
Topic: Difference
Replies: 1
Views: 223

### Difference

Sun Feb 07, 2016 2:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Really confused
Replies: 1
Views: 260

### Really confused

I really don't understand question 14.15 where for part a it gives AgBr(s) -----> Ag+(aq) + Br- (aq), a solubility equilibrium. We have to write the half reactions and devise a galvanic cell. I don't know how to do it for this problem. Please help!
Sun Feb 07, 2016 1:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Electrodes
Replies: 1
Views: 548

### Inert Electrodes

I was solving questions and sometimes they would put Pt such as in question 14.11 where part e) has Pt added at the end of each half cell. How do you know when to apply Pt and when to not?
Sun Jan 31, 2016 6:43 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Equation dealing with entropy and heat
Replies: 1
Views: 346

### Equation dealing with entropy and heat

So for entropy it is delta s = heat reversible/t. Can this equation be used also for irreversible? And when do we apply the q= -w?
Sun Jan 24, 2016 1:13 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Question 8.28
Replies: 1
Views: 713

### Question 8.28

Question 8.28 asks: A sample of gas in a cylinder of volume 3.42 L at 298 K and 2.57 atm expands to 7.39 L by two different pathways. Path A is an isothermal, reversible expansion. Path B has two steps. In the first step, the gas is cooled at constant volume to 1.19 atm. In the second step, the gas ...
Sun Jan 17, 2016 8:02 pm
Forum: Calculating Work of Expansion
Topic: Specific heat capacity and molar heat capacity
Replies: 3
Views: 1408

### Specific heat capacity and molar heat capacity

I was reading section 8.5 which deals with the measurement of heat. I was really confused with the part about specific heat capacity and molar heat capacity. What is the difference between the two and for which situation do these apply to?
Sun Jan 10, 2016 8:32 pm
Forum: Phase Changes & Related Calculations
Topic: Question 8.19
Replies: 1
Views: 306

### Question 8.19

Question 8.19 asks: (a) Calculate the heat that must be supplied to a 500.0-g copper kettle containing 400.0g of water to raise its temperature from 22.0 Celsius to the boiling point of water 100.0 Celsius. (b) What percentage of the heat is used to raise the temperature of the water? So I understan...
Thu Dec 03, 2015 9:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 44 chapter 11
Replies: 1
Views: 337

### Question 44 chapter 11

Question 44 asks: Consider the reaction 2NO2 (g)---> 2NO (g) +O2 (g). If the initial partial pressure of NO2 (g) is 3.0 bar and x is the equilibrium concentration of O2(g), what is the correct equilibrium relation? (a) K=x^3; (b) K= 2x^2/(3.0-2x)^2; (c) K=4x^3/ (3.0-2x)^2; (d) K=x^2/ (3.0-x); (e) K=...
Thu Nov 26, 2015 7:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Question 101
Replies: 1
Views: 288

### Equilibrium Question 101

The question is : A) Calculate K at 25 Celsius for the reaction br2(g)---> 2Br(g) from the thermodynamic data provided in appendix 2a. B) What is the vapor pressure of liquid bromine? I was confused about the vapor pressure. Is it the same way that we normally calculate pressure or is it different? ...
Mon Nov 23, 2015 1:35 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question regarding units
Replies: 1
Views: 304

### Question regarding units

The question is regarding number 24 from the textbook in chapter 11. Q: The equilibrium constant for the reaction PCl3(g)+Cl2(g)--> PCl5(g) is K=3.5 x 10^4 at 760 C. At equilibrium the partial pressure of PCl5 was 1.3 x 10^2 bar and that of PCl3 was 9.56 bar. What as the equilibrium partial pressure...
Fri Nov 13, 2015 7:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming the compounds
Replies: 3
Views: 424

### Naming the compounds

I was unsure about the part where you name the compound and add the roman numerals to the name. For instance, it states [Co(NH3)3(OH2)3]2(SO4)3. They say the name for this is triamminetriaquacobalt(III). I was wondering where the (III) came from and how you would know that it is (III).
Mon Nov 09, 2015 1:11 am
Forum: Lewis Structures
Topic: Quiz Questions
Replies: 1
Views: 408

### Quiz Questions

On the quiz there were several questions regarding lowest energy lewis structures. While solving it out there was a situation where I had to draw the lewis structure for NO. I was able to draw a triple bond but then I was wondering for a linear shape do both atoms have to have +0 charge? Or is it ok...
Sun Nov 01, 2015 8:44 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Question 4.64
Replies: 1
Views: 1237

### Question 4.64

The question states Which of the following species are paramagnetic: (a) N2-; (b) B2-; (c) B2+? If the species is paramagnetic, how many unpaired electrons does it possess? What I was wondering about is whether if the charge on the molecules has any correlation with the unpaired electrons. Is it pos...
Sat Oct 24, 2015 3:26 am
Forum: Ionic & Covalent Bonds
Topic: Question regarding the central atom
Replies: 2
Views: 391

### Question regarding the central atom

In question 3.36, it states "Write the Lewis structure of (a) nitronium ion, ONO+". I understand that the starting atom should be the central atom but in a case where there are two oxygen atoms, would the oxygen be the central atom or would it be the nitrogen?
Sat Oct 17, 2015 1:17 pm
Forum: Resonance Structures
Topic: Writing the Lewis Structure
Replies: 1
Views: 306

### Writing the Lewis Structure

Overall, I understand which atom is the central atom along with the theory behind resonance. However, I am still clueless about question 3.10 from the textbook. The question states: Which E 3+ ions are predicted to have the following ground-state electron configurations: (a) [XE] 4f 14 5d 8 ; (b) [X...
Sun Oct 11, 2015 10:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question 2.29 regarding the quantum numbers in an atom
Replies: 1
Views: 307

### Question 2.29 regarding the quantum numbers in an atom

Question 2.29 states : How many electrons can have the following quantum numbers in an atom: (a) n=2, l=1; (b) n=4, l=2, ml= -2; (c) n=2; (d) n=3, l=2, ml= +1 I understand that for part a the energy level is 2 and the orbital angular momentum of the electron is 1 which results in 2p, thus having 6 e...
Sun Oct 04, 2015 11:16 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: I am quite confused behind the concept regarding 1.45
Replies: 1
Views: 424

### I am quite confused behind the concept regarding 1.45

The problem is : A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 ± 5.0 ms^-1. What is the minimum uncertainty in its position? I used the equation Δx= ћ/2mΔv I knew at this point that ћ= (1.054 x 10^-34 kg x m^2 x s^-1), m= 8.00 kg. However, I was really confused behind wh...