Ch. 3 Redox Flashcards
What is the reductant
causes another species to be reduced // oxidized itself
What is the oxidant
causes another species to be oxidized // reduced itself
what side is the electrons in oxidation
= 1e on right (product side as gives away)
what side is the electrons in reduction
= 1e on left (reactant side as receives)
Steps to writing haply equations
- Balance (except H and O)
- Water (add H2O to side with no O)
- Hydrogen (add H+ to opposite side of water)
- Electrons (to side most positive)
Steps to joining equations
- Add phases
- Multiply coefficients so electrons are equal
- Add two equations together (minus electrons)
Acronym for half equations
Breakfast We Have Eggs
What is a cation/ anion
- Cations= positive charged ions
- Anions= negatively charged ions
in metal displacement, which metal loses electron
most reactive
What factors influence reactivity
- # of protons in nucleus♣ greater # of protons= greater force of attraction b/w nucleus and valance electrons
- Distance of valance electrons from nucleus
♣ greater the distance of valance from nucleus= smaller force of attraction b/w nucleus and valance - number of shells b/w valance and nucleus that are shielding in valance electrons from nucleus
♣ greater # of shells= smaller force of attraction b/w nucleus and valance
What is ionisation energy
energy required to remove one electron for a gaseous species
define corrosion
oxidation of a metal in the presence of air to form the metal oxide
What does water vapour act as during corrosion
acts as electrolyte (conducts electric current) for the transfer of the electrons from the metal to oxygen
define passivating metal
metal that forms an impervious oxide layer (does not allow particular substances to pass through) on its surface, prevents further corrosion
What is the oxidation state of elements
0
