Chemical change

What can’t be displaced using carbon

• K

• Na

• Ca

• Mg

• Al

What can be displaced using carbon

• Zen

• Fe

• Sn

• Pb

• H

• Cu

• Ag

• Au

• Pt

Displacement

Process in which a more reactive element displaces a less reactive element form a compound

• Can be used to obtain metals from their ores

Neutralisation

• Acid + alkali = neutralisation/salt

• Obtain crystals by gently heating the mixture so water evaporates and the salt is left behind

Titration

1. Burette measure the volume of acid / alkali needed to neutralise the unknown concentration

2. In calculation but the unknown compound at the top, then at the sides but volume, mass , moles and ratio.

3. Mass Mr moles and concentration is concentration/ volume

Electrolysis

Passing an electrical current through a substance to cause oxidation and reduction at the two electrodes

• Only happens when ions are free to move around ( molten or in solution )

• POSITIVE IONS = CATIONS AND GO TO THE ANODE

• NEGATIVE IONS = ANIONS AND GO TO THE CATHODE.

• OPPOSITES ATTRACT