Search found 16 matches

by feodora_r_3d
Sat Mar 18, 2017 11:25 pm
Forum: *Electrophilic Addition
Topic: Reaction step naming
Replies: 3
Views: 532

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...
by feodora_r_3d
Sat Mar 18, 2017 11:19 pm
Forum: *Haloalkanes
Topic: Transition states and mechanisms?
Replies: 1
Views: 720

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 )
by feodora_r_3d
Sun Mar 12, 2017 11:10 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Arrows
Replies: 1
Views: 303

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...
by feodora_r_3d
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: 630

Re: How much of Common naming do we need to know for Quiz 3?

Yes, neo is used for 5 carbons and more only
by feodora_r_3d
Mon Mar 06, 2017 6:33 pm
Forum: *Alkenes
Topic: 1.26
Replies: 2
Views: 468

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.
by feodora_r_3d
Sun Mar 05, 2017 9:58 pm
Forum: *Alkanes
Topic: Which structure?
Replies: 2
Views: 216

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...
by feodora_r_3d
Thu Mar 02, 2017 2:36 pm
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 7821

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
by feodora_r_3d
Mon Feb 20, 2017 8:50 pm
Forum: First Order Reactions
Topic: 15.29
Replies: 3
Views: 770

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...
by feodora_r_3d
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: 238

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...
by feodora_r_3d
Fri Feb 10, 2017 9:46 pm
Forum: Balancing Redox Reactions
Topic: Self Test 14.2 B
Replies: 2
Views: 282

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!
by feodora_r_3d
Fri Feb 10, 2017 3:59 pm
Forum: Balancing Redox Reactions
Topic: Self Test 14.2 B
Replies: 2
Views: 282

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&...
by feodora_r_3d
Sun Feb 05, 2017 9:43 am
Forum: Phase Changes & Related Calculations
Topic: Why Does Steam Cause Severe Burns?
Replies: 2
Views: 352

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 ...
by feodora_r_3d
Tue Jan 31, 2017 10:00 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 5
Views: 452

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...
by feodora_r_3d
Sun Jan 29, 2017 12:24 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW Ch. 8 #39
Replies: 1
Views: 219

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...
by feodora_r_3d
Sun Jan 22, 2017 5:15 pm
Forum: Phase Changes & Related Calculations
Topic: units for pressure [ENDORSED]
Replies: 2
Views: 235

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.
by feodora_r_3d
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: 348

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...

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