Chemical change

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Chemistry

Acids and Bases

IGCSE Chemistry

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6 Terms

1
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What can’t be displaced using carbon

  • K

  • Na

  • Ca

  • Mg

  • Al

2
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What can be displaced using carbon

  • Zen

  • Fe

  • Sn

  • Pb

  • H

  • Cu

  • Ag

  • Au

  • Pt

3
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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

4
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Neutralisation

  • Acid + alkali = neutralisation/salt

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

5
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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

6
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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