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26 Cards in this Set
- Front
- Back
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When do zinc/copper carbonate decompose?
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When heated
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How do you know when zinc/copper carbonate are decomposing? Give an example.
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Distinctive colour changes
e.g. ZnCO₃ (s) → ZnO(s) + CuCO₃(s) → CuO(s) + CO₂(g) White Yellow Solid (hot) Green Black Solid White solid (cold) Solid Solid |
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When does Carbon dioxide dissolve well in water?
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When it is under pressure.
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Why can CO₂ be collected by downward delivery?
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It is more dense than air
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What is downward delivery?
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When does Carbon Dioxide become less soluble?
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At low pressure or high temperature
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Why is carbon dioxide used in fire extinguishers?
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It displaces oxygen because it is more dense than air, starving the flames
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What does Acid + metal create?
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Acid + Metal → Salt + Hydrogen
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How do you prepare hydrogen?
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Why doesn't Aluminium readily react with dilute acids?
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It has a protective oxide layer
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What happens if Aluminium is reacted with dilute acid? Give 2 symbol equations
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2Al(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂(g)
2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H₂(g) |
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What happens when a metal corrodes? Give an example.
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Metal reacts with oxygen
e.g. Magnesium + Oxygen → Magnesium Oxide |
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What is given off when a metal reacts with water?
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Hydrogen
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What do less reactive metals react with steam to form?
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metal oxides
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What do more reactive metals react with steam to form?
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metal hydroxides
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What is given off when a metal reacts with acid? Give an example.
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Hydrogen and a salt
Magnesium + Hydrochloric→ Magnesium + Hydrogen acid chloride |
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What is the test for hydrogen?
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A lit splint will pop in its presence
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What is a displacement reaction?
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A more reactive metal displaces a less reactive metal from its compound
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When will a reactive metal displace a less reactive one from a metal oxide? Give an example.
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When it is heated.
e.g. Zinc + Iron Oxide → Iron + Zinc Oxide |
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What is a Thermit reaction?
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A very exothermic reaction
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What is an exothermic reaction?
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A reaction with the evolution of heat
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What is a reducing agent?
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The element that takes oxygen from a compound
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What is an oxidising agent?
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The element that gives oxygen to a reducing agent
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When is rust formed?
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When iron reacts with water and oxygen
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Name 4 ways of preventing rust.
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Regular painting or oiling
Galvanising (coat it with zinc) Make object out of non rusting object Attach zinc bars to ships |
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What is zinc used as in method 2 and 4 of Q25?
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A sacrificial metal
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