Electrochemistry
- 10.2 Nernst Equation
Electrochemistry : 10.2 Nernst Equation NERNST EQUATION Cell potential (E°cell) under any condition Ecell = E°cell – (RT/nF) ln Q R: universal gas constant. Q...
- Atoms, Molecules & Stoichometry
+ Objectives (a) define the terms relative atomic, isotopic, molecular and formula mass, based on the 12C scale (b) define the term mole in terms of the Avogadro constant (c) calculate the relative atomic mass of an element given the relative abundances...
- Electrochemistry
Learning Objectives(a) describe and explain redox processes in terms of electron transfer and/or of changes in oxidation number (oxidation state) (b) define the terms: (i) standard electrode (redox) potential (ii)...
- How To Balance Ionic Equations In Alkaline Medium?
(I) Standard Electrode Potential What information can we obtain from SEP? Sign – oxidation or reduction favoured Magnitude – the extent the reaction is favoured How to measure SEP? - connecting the redox couple (half cell) to SHE. - learn to draw...
- Thermochemistry : 9.1 Concept Of Enthalpy
Heat-The energy transferred between a system and surrounding. System-Part of universe whose change we are going to observe. Surrounding-The rest of the universe outside the system. Exothermic-Gives off heat.-From the system to the surroundings.-Ex : 2H2(g)...
Electrochemistry
Ideal Gas Calculations
Strategies:1. Read the question carefully to extract all the given information: - initial and final T, P, V
- no. of moles of gas, n
- unchanged conditions (constant T, P, V, n?)For difficult or wordy questions, drawing a simple diagram will aid understanding.2. Apply relevant gas law equations.Constant T, Pi x Vi = Pf x Vf (Boyles’ law)
Constant P, Vi/ Ti = Vf/ Tf (Charles’ law)
Constant V, Pi/ Ti = Pf/ Tf
Constant T,P Vi/ ni = Vf/ nf (Avogadro's law)
Constant n,
3. When using the ideal gas equation, PV = nRTP : pressure of gas in Nm-2 or Pa.
V : volume of gas in m3
T : absolute temperature in Kelvins
n : number of moles of gas
R : Universal gas constant (8.314 J K-1 mol-1)* remember to convert all conditions to S.I. units.Many questions will present P, V, T in non S.I. units (e.g. atm, dm3, oC) to trick unsuspecting students.
- 10.2 Nernst Equation
Electrochemistry : 10.2 Nernst Equation NERNST EQUATION Cell potential (E°cell) under any condition Ecell = E°cell – (RT/nF) ln Q R: universal gas constant. Q...
- Atoms, Molecules & Stoichometry
+ Objectives (a) define the terms relative atomic, isotopic, molecular and formula mass, based on the 12C scale (b) define the term mole in terms of the Avogadro constant (c) calculate the relative atomic mass of an element given the relative abundances...
- Electrochemistry
Learning Objectives(a) describe and explain redox processes in terms of electron transfer and/or of changes in oxidation number (oxidation state) (b) define the terms: (i) standard electrode (redox) potential (ii)...
- How To Balance Ionic Equations In Alkaline Medium?
(I) Standard Electrode Potential What information can we obtain from SEP? Sign – oxidation or reduction favoured Magnitude – the extent the reaction is favoured How to measure SEP? - connecting the redox couple (half cell) to SHE. - learn to draw...
- Thermochemistry : 9.1 Concept Of Enthalpy
Heat-The energy transferred between a system and surrounding. System-Part of universe whose change we are going to observe. Surrounding-The rest of the universe outside the system. Exothermic-Gives off heat.-From the system to the surroundings.-Ex : 2H2(g)...