Search found 10 matches

by Rachel_Prescott_2M
Sat Mar 18, 2017 1:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge [ENDORSED]
Replies: 4
Views: 650

Re: Salt Bridge [ENDORSED]

A salt bridge is an inverted u-shaped tube that contains an electrolyte and allows the two half cells to be connected so ions can flow freely and the charge between the half cells remains balanced. A porous disk allows cation/anion flow as well but takes the form of a disk in between the two solutio...
by Rachel_Prescott_2M
Sat Mar 11, 2017 1:56 pm
Forum: *Alcohols
Topic: Types of Alcohols [ENDORSED]
Replies: 1
Views: 305

Re: Types of Alcohols [ENDORSED]

The difference between primary, secondary, and tertiary alcohols depends on how many other carbons the carbon attached to the -OH is bonded to. In a primary alcohol, the carbon attached to the -OH group is only attached to one other carbon. In a secondary alcohol the carbon attached to the -OH group...
by Rachel_Prescott_2M
Sun Mar 05, 2017 5:46 pm
Forum: *Alkanes
Topic: sec and tert
Replies: 2
Views: 294

Re: sec and tert

sec- and tert- are commonly used for naming substituents. Sec- stands for secondary which means the carbon that the functional group is attached to is also attached to 2 other carbons and tert- stands for tertiary which means the carbon is attached to 3 other carbons. I think this applies mostly jus...
by Rachel_Prescott_2M
Sun Feb 26, 2017 4:37 pm
Forum: *Electrophiles
Topic: nucleophile and electrophile
Replies: 3
Views: 607

Re: nucleophile and electrophile

I'm pretty sure it does because a greater electronegativity means the molecule is more attracted to electrons. Electrophiles are also attracted to electrons meaning the greater the electronegativity of a substance the stronger the electrophile and the weaker the nucleophile.
by Rachel_Prescott_2M
Mon Feb 20, 2017 12:31 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow step vs. Fast step
Replies: 3
Views: 2377

Re: Slow step vs. Fast step

The slow step determines the rate of reaction and for this reason it is also called the rate determining step. The slow step serves as a bottleneck of sorts, the rate at which something gets to a bottleneck (fast step) doesn't really matter for the overall rate, but the rate something gets through t...
by Rachel_Prescott_2M
Sun Feb 19, 2017 10:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Difference between Delta H and q?
Replies: 3
Views: 14862

Re: Difference between Delta H and q?

q is the amount of heat transferred to a system whereas \Delta H is used to describe the change in enthalpy. Enthalpy is the total potential energy of a system, which is associated with the heat transferred to/from a system (q). However, at constant pressure q_{p}=\Delta H which can make it difficul...
by Rachel_Prescott_2M
Sat Feb 04, 2017 5:53 pm
Forum: Balancing Redox Reactions
Topic: Blancing redox [ENDORSED]
Replies: 2
Views: 324

Re: Blancing redox [ENDORSED]

H2S and S may look neutral, but to write a redox reaction we look at each element individually to determine charge. So while the compound H2S is neutral, the sulfur atom is not and in fact has a -2 charge to balance out the 2 hydrogen atoms with +1 charges within the molecule. The sulfur is being ox...
by Rachel_Prescott_2M
Sun Jan 29, 2017 1:03 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Quiz 1 Preparation, Question #11
Replies: 1
Views: 267

Re: Quiz 1 Preparation, Question #11

You can use the \Delta H given to you as a conversion factor of sorts since it is in kJ/mol. So after converting the grams of PbO to moles multiply that value by 106.9 KJ/mol so the moles cancel and you are left with kJ's. This value is the same as q in the equation q=mC\Delta T so you can plug in a...
by Rachel_Prescott_2M
Fri Jan 20, 2017 3:28 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 8.27
Replies: 2
Views: 325

Re: 8.27

The equation used for part a, when the reaction is irreversible and against a constant pressure, is w=-P(v2-v1) whereas the equation used for an isothermal and reversible expansion is w=-nRTln(v2/v1). For part b, the reaction may not be taking place with a constant pressure so the usual w=-P(v2-v1) ...
by Rachel_Prescott_2M
Sat Jan 14, 2017 5:45 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Change of CO2
Replies: 1
Views: 247

Re: Phase Change of CO2

CO2 commonly sublimes because the atmospheric pressure on Earth is too low for it to transition through the liquid state. CO2 can be in a liquid state, but this would only be seen in a very high pressure environment that can usually only be replicated in a lab. Additionally, the intermolecular force...

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