Flashcards
displacements & ores
Flashcards do conjunto (20)
- 1define reactivity seriesthe list of metals in order of their reactivity with the most reactive at top and the least reactive at the bottom
- 2What is the reactivity series?Potassium
Sodium
Calcium
Magnesium
Aluminium
[ Carbon ]
Zinc
Iron
Tin
Lead
[ Hydrogen ]
Copper
Mercury
Silver
Gold
Platinum - 3What is always given off when a metal reacts with water or a dilute acid?hydrogen
- 4What is: a) oxidation b) reductiona) to have oxygen added
b) have oxygen removed - 5metal + oxygenmetal oxide
• called an oxidation reaction
• some react slowly and some react quickly - 6metal + waterhydroxide + hydrogen
• always [metal] hydroxide and hydrogen gas - 7metal + acidsalt + hydrogen
- 8Explain why the non-metals, carbon and hydrogen, are given positions based on a series of displacement reaction.for example, copper cannot replace/displace the hydrogen from an acid, whereas lead can, so it is placed between copper and lead in the reactivity series
- 9What is displacement reaction?when a more reactive metal will displace a less reactive metal from an aqueous solution of one of its salts
- 10How is the reaction between magnesium and copper sulphate a displacement reaction?= magnesium + copper sulphate
• magnesium is more reactive than copper so it replaces it from its aqueous solution - 11Give the symbol and ionic equation for the reaction: magnesium + copper sulphate → magnesium sulphate + copperMg + CuSO4 → MgSO4 + Cu
Mg + Cu2+ → Cu + Mg2+ - 12Why are displacement reactions also known as redox reactions? (REDuction - OXidation)→ one substance loses oxygen whereas another one gains it
→ also refers to the transfer of electrons:
• oxidation is loss
• reduction is gain
[ OIL RIG ] - 13Which ions have been oxidised/reduced in this ionic equation? Mg + Cu2+ → Cu + Mg2+ Give the half equation.→ magnesium is oxidised as it loses electrons
Mg - 2e- → Mg2+
→ copper is reduced as it gains electrons
2e- + Cu2+ → Cu - 14Give the ionic and half equations for the reaction between iron and copper sulphate.Fe + Cu2+ → Cu + Fe2+
• iron is oxidised- it loses electrons
Fe - 2e- → Fe2+
• copper is reduced- it gains electrons
2e- + Cu2+ → Cu - 15What is an ore?a rock containing enough metal to make it worthwhile extracting economically, depending on:
• how easy it is to extract from its ore
• how much metal the ore contains
• the demands for the particular metal - 16A _____ reactive metal will displace a ______ reactive metal from its ore.A more reactive metal will displace a less reactive metal from its ore.
- 17How is carbon used to extract metals?it will displace less reactive metals from their oxides- the metal oxide and carbon is heated forming the metal and waste carbon dioxide
- 18metal oxide + carbonmetal + carbon dioxide
- 19Why is hydrogen sometimes used as the reducing agent to extract metals, instead of carbon? Give an example.Sometimes the carbon may form a compound, which is useless
For example, tungsten obtained from the reduction of its oxide by hydrogen is very pure:
tungsten oxide + hydrogen → tungsten + water - 20How are metals more reactive than carbon extracted?through electrolysis
Informações
- Descrição
- • 5.1: the reactivity series • 5.2: displacement reactions • 5.3: extracting metals
- Criado por
- Farha Idrees
- Visualizações
- 7
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