CHE2C Others

What does it mean for a battery to be dead?

Both reactions have reached equilibrium:
- deltaG = 0
- K=Q
- cell can no longer work

Batteries

group of galvanic cells connected in a series to produce continuous current

What type of reaction is corrosion?

oxidation

Which metals resist corrosion? What are the solutions they can make?

• Al, Cu, Ag, Fe

• (Al2(OH)6)

• CuCO3 (patina)

• Ag2S (tarnish)

• Fe2O3

What is the mechanism of iron corrosion?

Iron is rusting instead of the metal underneath

• involves water and oxygen in the cathode reaction

What are preventative corrosion methods?

painting, galvanizing (metal plating), alloying (mix of metals), cathode protection (sacrificing anode)

What is the electrolytic stoichiometry?

current / time → quantity of current → moles of electron → moles of elements → grams of elements:
- g x 1/mw x e-/mol x F/mol x sec/c = seconds

What is involved in electrolysis?

aluminum, copper, electro plating, sodium

What are the different types of ligands?

• monodentate

  • make only one bond

• chelating ligand

  • has more than one lone pair so it can make several bonds with TM

    • bidentate, polydentate, hexdentate

Bidentate

• has 2 coordinating atoms

  • ex) oxalate and ethylenediamine (en)

polydentate

• has 4 coordinating atoms

  • ex) diethylenetriamine (dien)

hexadentate

• has 6 coordinating atoms

  • ex) ethylenediaminetetraacetate (EDTA)

Typical geometry of coordination numbers

• linear

  • 2 ligands

• tetrahedral (square planar)

  • 4 ligands

• octahedral

  • six ligands