C4-Chemical Changes

• what happens when metal reacts with metal oxide

  metal oxide is formed (has been oxidised)

  
  

  oxidations reaction takes place
• what determines how rapidly a metal reacts in reactivity series

  ability to lose electrons and form ion
• metals at top of reactivity series regularly lose electrons and form ion
• what happens during extraction of metals

  more reactive element will displace a less reactive element
• what is oxidation

  loss of electron
• what is reduction

  gain of electron
• acid PH solution

  0-6 are acids
• what Is neutral in PH solution

  7
• alkalis PH solution

  8-14 are alkalis
• neutral colour in universal indicator

  green
• very acidic colour in universal indicator

  red
• very alkaline colour in universal indicator

  purple
• neutralisation equation

  H+ (aq) + OH- (aq) ----> H20 (L)
• what happens when Hydrochloric acid reacts with metals

  metal -- chloride
• what happens when sulphuric acid react with metals

  metal-- sulfate
• what does aqueous (Aq) mean

  dissolved in water
• what do hydraulic acids produce

  chlorides
• what do sulphuric acids produce

  sulfates
• what do nitric acids produce

  nitrates
• how to tell if something is a weak acid or strong acid

  strong acids have lower PH then weak acids
• what is it meant by concentration of acid

  amount of acid molecules given in volume of solution
• dilute acid compared to concentration acid

  will have fewer acid molecules even if strength is same
• what does molten mean

  melted
• what is electrolyte

  melting or dissolving ionic compound so the forces of attraction break and it can conduct electricity
• what is electroylsis

  using electricity to break down electrolytes to form elements
• what is the cathode

  negative electrode
• what is anode

  positive electrode
• where do positive ions move during electrolysis

  to cathode and gain electrons to form atom
• where do negative ions move during electrolysis

  to anode and lose electron to form atom