Section 4 - Inorganic Chemistry Flashcards
group 1 elements
alkali metals
reactivity in group 1
more reactive down the group
electrons loss group 1
the more further away the electron is from the nucleus the easier it is to lose it
Group 7 elements
Halogens
group 7 atomic number
as it increases the elements have a darker colour and higher boiling points
group 7 reactivity
the higher it is on the periodic table the more reactive it is
As atomic number of halogens increases:
Elements have darker colour and higher boiling point
Chlorine (Cl2)
- fairly reactive
- green gas
- poisonous
Bromine (Br2)
- red-brown liquid
- gives out orange vapour at room temp.
Iodine (I2)
- dark grey crystalline solid
- gives off purple vapour when heated.
displacement reaction def
when a more reactive element displaces a less reactive element from a compound
oxidation def
loss of electrons
Reduction def
gain of electrons
redox reaction
reactions where reduction and oxidation happen at the same time
Magnesium burned in air
- burns with bright white flame and white powder
- MgO slightly alkaline when dissolved in water
Hydrogen burned in air
- easily burned, can be explosive
- Almost invisible pale blue flame
- only product water
- The comnustion of hydrogen is described with a ‘squeaky pop’
Reactivity series
putas sadicas limpiando calcetines magneticamente autosaboteando zebras ironicamente cazando serpientes gordas
How is rust made?
iron + water+ oxygen -> hydrated iron (III) oxide (rust)
Three main ways of preventing rusting?
- Painting/ coating with plastic - ideal for big and small structures alike
- Oiling/ Greasing - best when object is moving
- sacrificial methord
Sacrificial methord
- placing a more reactive metal with the iron.
- Water and oxygen then react with this metal insead than with iron
- normally zinc is used and a coating is sprayed (GALVANISING)
