C4 - Chemical Changes
- Created by: JellyBeanBears
- Created on: 16-05-18 15:53
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- Chemical Changes
- Acids and Bases
- pH scale goes from acidic to alkali (0-14)
- pH can be measured
- Universal indicatior
- A pH probe attached to a pH meter
- Acids form H+ ions in water
- base is a substance with a pH greater that7
- Alkalis form OH- ins in water
- Acid + base == salt + water
- H+(aq)+OH-(aq) == H2O (l)
- Strong / Weak acids
- strong acids ionise completely
- all particle dissociate to release H+ ions
- More reactive than weak acids
- weak acid don't ionise completely
- a few particles dissociate to release H+ ions
- these are reversible and set up equilibriums
- pH is the measure of concentration of H+ ions in acids or alkalis
- Factor H+ ion concentration = 10'-x
- x = difference in pH
- strong acids ionise completely
- Reaction of Acids
- acid + metal oxide == salt + water
- Acid + metal carbonate == salt + water + carbon dioxide
- acid + metal hydroxide == salt + water
- Redox Reactions
- if electrons are transferred its a redox reacrion
- Displacement reactions
- a more reactive metal will replace a less reactive metal from its compound
- iron + copper sulphate == iron sulphate + copper
- Iron is more reactive than copper
- Copper was displaced by iron
- iron + copper sulphate == iron sulphate + copper
- a more reactive metal will replace a less reactive metal from its compound
- Acids and Bases
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