Chap 7 - redox, alloys, metals, properties Flashcards
note: oxidation & reduction always go tgt
diff. in numbering of oxidation state & ionic
oxidation state - +2
ionic - 2+
reduction things
-loss of oxygen
-gain of electrons
-gain of hydrogen
-oxidising agent
oxidation things
-gain of oxygen
-loss of electrons
-loss of hydrogen
-reducing agent
define spectator ion
-ion that doesn’t change in a reaction
OILRIG
-Oxidation Is Loss of electrons
-Reduction Is Gain of electrons
ionic half equations
-find oxidising & reducing agents
Reactants -> Prodcuts
- _a__ -> ___ + ____e (a is oxidised)
- _a__ + ____e -> _____ (a is reduced)
-electrons in both are the same
rules:
-all elements oxidation state = 0 - electrically neutral
-rmb charges for some compounds - eg, SO4 = -2
-H oxidation state = +1
-O2 oxidation state = -2
-a compound oxidation state total = 0
ionic equations
-rewrite half equations
-cancel electrons from both sides
magnetic metals
-iron
-cobalt
-nickle
define delocalised
free to move
define metallic bonding
positive metal ions in a sea of delocalised electrons held by electrostatic forces
which bonds have giant lattice structure
-metallic bonds
-ionic bonds
-giant covalent bonds
why can metals conduct electricity
-delocalised electrons are free to move and carry charge freely through the structure
properties of metal
-malleable
-high melting/ boiling point
-good thermal conductivity
-good electrical conductivity
-ductile
which metal has a low boiling point
mercury
define malleable
bent or hammered into shape
define ductile
drawn into wires
why are metals malleable/ ductile
-particles are in ordered structure
-layer can slide over each other
define good thermal/ electrical conductivity
-can conduct heat/ electricity well
why do metals have good thermal/ electrical conductivity
-delocalised electrons can more freely & carry energy/ charge through the structure
-Only energy can be passed by vibrating particles too
define alloy
A mixture of a metal with another substance
why an alloy is more useful than the pure metal
-it’s harder
-because other element disrupts the lattice structure &
-makes it more difficult to remove the layers form the metal
define brass
An alloy of copper and zin