Search found 6 matches

by MichelleVu2H
Thu Feb 18, 2016 8:44 pm
Forum: Method of Initial Rates (To Determine n and k)
Replies: 1
Views: 1943


It is for when you use the Arrhenius equations for two temperatures. For instant, temp T1: ln k1 = ln A - Ea/RT1 temp T2: ln k2 = ln A - Ea/RT2 Combine and subtract them from each, usually like T2-T1: ln k2 - ln k1 = ln A - ln A - Ea/RT2 - (- Ea/RT1) Cancel out the ln A: ln k2 - ln k1 = -Ea/RT2 + Ea...
by MichelleVu2H
Fri Feb 05, 2016 9:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity of a Calorimeter
Replies: 1
Views: 449

Re: Heat Capacity of a Calorimeter

Since the enthalpy of combustion is negative, heat is being lost by the reaction. Heat lost by reaction is the heat gained by the calorimeter, thus -q = qcal = Ccal * delta T. Rewriting it you get Ccal = -q/delta T
by MichelleVu2H
Sat Jan 30, 2016 1:38 am
Forum: Balancing Redox Reactions
Topic: Hydrogen Electrode
Replies: 1
Views: 351

Re: Hydrogen Electrode

Hydrogen electrode is a metallic conductor consisting of hydrogen gas submerged in an electrolyte solution. It is significant in that when hydrogen's standard potential is set to zero at all temperatures, it is referred to as the standard hydrogen electrode, which is then used to find the numerical ...
by MichelleVu2H
Fri Jan 22, 2016 9:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8838
Views: 1496968

Re: Chemistry Jokes

Do you have mole problems?
If so, call Avogrado at 602-1023
by MichelleVu2H
Thu Jan 14, 2016 4:04 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Affecting Isolated Systems
Replies: 2
Views: 414

Re: Affecting Isolated Systems

I don't believe there is. An isolated system has no contact with the surroundings which means nothing is being exchanged between the system and the surroundings. In addition, the first law of thermodynamics state that the internal energy of an isolated system is constant which also explains why the ...
by MichelleVu2H
Thu Jan 07, 2016 6:14 pm
Forum: Phase Changes & Related Calculations
Topic: Temperature Vs. Heat
Replies: 5
Views: 1046

Re: Temperature Vs. Heat

I would assume so. The loss or addition of heat into a system would cause a change in temperature or that the reaction gave off energy in the form of heat.

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