Search found 16 matches
- Sat Mar 18, 2017 11:25 pm
- Forum: *Electrophilic Addition
- Topic: Reaction step naming
- Replies: 3
- Views: 1557
Re: Reaction step naming
Yes, electrophilic addition is always two step. For SN2, its basically substitution. The two reactants are usually a reaction between a hydrocarbon with substituent attached to one of its carbon (for example Bromine) and another molecule (example OH). So what it means by substitution is the substitu...
- Sat Mar 18, 2017 11:19 pm
- Forum: *Haloalkanes
- Topic: Transition states and mechanisms?
- Replies: 1
- Views: 1739
Re: Transition states and mechanisms?
I think this depends on the question and usually the question will specify whether we should draw the transition states or not. But in most cases like the ones in the practice finals, when we are asked to draw the mechanisms, drawing transition states are mandatory ( and is stated in the question )
- Sun Mar 12, 2017 11:10 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrows
- Replies: 1
- Views: 650
Re: Arrows
I'm guessing the arrows you meant by pointing from hydrogen to chlorine are bromine is most probably from the bonds, and not from the hydrogen atom itself. If it is from the bond, then one explanation is because bonds contain electrons and therefore can be considered a source of electron or electron...
- Sun Mar 12, 2017 11:07 pm
- Forum: *Cycloalkanes
- Topic: How much of Common naming do we need to know for Quiz 3?
- Replies: 4
- Views: 1763
Re: How much of Common naming do we need to know for Quiz 3?
Yes, neo is used for 5 carbons and more only
Re: 1.26
Yes, E means that the atoms or atom groups are on opposite sides of the double bond. In this question, Br and CH2CH3 are opposite of each other, which is why it's E. We compare Br and Ch3Ch2 instead of Ch2Ch2Ch3 because Br gets more priority than the Ch2Ch2Ch3 atom groups.
- Sun Mar 05, 2017 9:58 pm
- Forum: *Alkanes
- Topic: Which structure?
- Replies: 2
- Views: 465
Re: Which structure?
I think usually the question will specify if they want lewis structure or line structure. If the question did not specify, I think we are free to draw either type of structures. Like in page 22 of the organic chemistry book, when the question is "draw the cycloalkane" we can draw either th...
- Thu Mar 02, 2017 2:36 pm
- Forum: *Alkanes
- Topic: Naming [ENDORSED]
- Replies: 93
- Views: 17044
Re: Naming [ENDORSED]
With #,# do you mean something like 2,3 dimethyl octane? If yes, then I think the numbers are to indicate which carbon the methyl is placed on. So if its 2,3 it means that on the second and third carbon, there is a methyl branch
- Mon Feb 20, 2017 8:50 pm
- Forum: First Order Reactions
- Topic: 15.29
- Replies: 3
- Views: 2561
Re: 15.29
I think what the solution manual's trying to do is to find the concentration of A after 3 minutes. To do so, we need to use the data that is given. The question gave the concentration of B after 3 minutes and we know that initially, the concentration of B is none since the product has not formed yet...
- Sun Feb 19, 2017 3:26 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Chapter 15 Question 19
- Replies: 1
- Views: 442
Re: Chapter 15 Question 19
This exercise is similar to example 15.2 on page 621-622. So in determining the reaction order in B, try to look at experiment 1 and experiment 3. From the two experiments, the concentration of B is increased by: \frac{3.02}{1.25} = 2.416 the rate (of the overall equation) changed by : \frac{50.8}{8...
- Fri Feb 10, 2017 9:46 pm
- Forum: Balancing Redox Reactions
- Topic: Self Test 14.2 B
- Replies: 2
- Views: 576
Re: Self Test 14.2 B
From the equation you write, yes I could identify the reduction and oxidation!! But could you explain how you can come up with that equation? Thankyou!
- Fri Feb 10, 2017 3:59 pm
- Forum: Balancing Redox Reactions
- Topic: Self Test 14.2 B
- Replies: 2
- Views: 576
Self Test 14.2 B
Hi! I am a bit confused with this question: When iodide ions react with iodate ions in basic aqueous solution, triiodide ions, I 3 - , are formed. Write the net ionic equation for the reaction. (Note that the same product is obtained in each half-reaction.) I got the equation like this: I - (aq&...
- Sun Feb 05, 2017 9:43 am
- Forum: Phase Changes & Related Calculations
- Topic: Why Does Steam Cause Severe Burns?
- Replies: 2
- Views: 1159
Re: Why Does Steam Cause Severe Burns?
Hi! steam cause severe burns because as steam touches our skin, It needs to change first from vapor to liquid. After changing from the liquid, its temperature then needs to change from 100 degrees (because steam is water vapor and it is at least at 100 degrees as water boils at 100 degrees) to that ...
- Tue Jan 31, 2017 10:00 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy
- Replies: 5
- Views: 1086
Re: Entropy
I think that might happen because when the temperature is increased, the system is given more heat too as heat increases the temperature. therefore as T increases, q actually also increases. And the increase in q is usually greater than that of T which is why in actuality when a system is heated ent...
- Sun Jan 29, 2017 12:24 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: HW Ch. 8 #39
- Replies: 1
- Views: 499
Re: HW Ch. 8 #39
For this question, I think you should use the specific heat capacity of liquid water instead of ice. Because this change is from water at 0 degree to 20 degrees. Therefore this process is made up of 2 sub-process. One is from the melting of ice water to liquid water at 0 degrees. Then followed by th...
- Sun Jan 22, 2017 5:15 pm
- Forum: Phase Changes & Related Calculations
- Topic: units for pressure [ENDORSED]
- Replies: 2
- Views: 528
Re: units for pressure [ENDORSED]
Yes! I agree, I think if no specific instruction is given, it would be best to convert it to atmosphere. For the conversions, I think all would be given to us. Try checking page 125 of the course reader, there are lists of constants and formulas that I think would be given to us.
- Sat Jan 14, 2017 11:32 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard States of Elements
- Replies: 1
- Views: 686
Re: Standard States of Elements
Most of the elements in the periodic table are in the solid state. I think it is easiest to remember those that are not. So I think you can just try to know that bromine and mercury are liquids. And noble gasses, hydrogen, oxygen, chlorine, fluorine, and nitrogen are gas. And the rest are solid. Hop...