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Chemistry Revision Exam Thing > Limestone > Flashcards

Limestone Flashcards

1
Q

Name three metal carbonates (any ones)

A
  1. Lithium Carbonate
  2. Calcium Carbonate
  3. Sodium Carbonate
    (any ‘metal’ + ‘carbonate’ is correct)
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2
Q

What are carbonates the chemical opposites of?

A

Acids

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3
Q

What is ‘thermal stability’?

A

How much heat something can withstand before decomposing (falling apart basically idk)

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4
Q

What is the formula for metal thermally decomposing?

A

Metal carbonate → metal oxide + carbon dioxide

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5
Q

What is limestone’s chemical name and formula?

A

Calcium Carbonate, CaCO₃

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6
Q

What is Calcium Oxide’s traditional name and formula?

A

Quicklime, CaO

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7
Q

What is Calcium Hydroxide’s traditional name and formula?

A

Slaked Lime, Ca(OH)₂

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8
Q

What are the word and symbol equations for the reactions in the limestone cycle?

A 
Calcium Carbonate (limestone) + heat → Calcium Oxide (quicklime) + Carbon Dioxide
CaCO₃ → CaO + CO₂

Calcium Oxide + Water → Calcium Hydroxide (slaked lime)
CaO + H₂O → Ca(OH)₂

(this second reaction creates a ton of heat, very exothermic)

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9
Q

What is limewater?

A

Diluted Calcium Hydroxide

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10
Q

What does Limewater (dilute slaked lime) react with to make Calcium Carbonate (limestone) again?

A

Carbon Dioxide

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11
Q

What colour does limewater go when reacting with carbon dioxide?

A

Milky

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12
Q

Name three uses of limestone

A
  1. Construction (bricks, concrete)
  2. Extracting Iron from it’s ore (minecraft)
  3. Neutralizing acidic soil
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13
Q

What are the 4 (5) benefits of Limestone?

A
  • Creates Jobs
  • Improves crop yield
  • Valuable raw material
  • Supports building industry
  • Coolest rock (wowzers)
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14
Q

What are 4 drawbacks of limestone?

A
  • Destroys habitats
  • Destroys natural beauty (giant hole in the hill after all limestone is taken)
  • Noise and dust pollution from quarrying
  • Increased traffic near quarries
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15
Q

Describe the entire limestone cycle >:)

A
  1. Limestone aka Calcium Carbonate aka CaCO₃
  2. Limestone thermally decomposes into Quicklime when heated
  3. Quicklime aka Calcium Oxide aka CaO
  4. Quicklime reacts with some H₂O to produce Slaked Lime
  5. Slaked Lime aka Calcium Hydroxide aka Ca(OH)₂
  6. Slaked Lime is diluted to become Limewater
  7. Limewater aka Dilute Calcium Hydroxide aka also Ca(OH)₂ but with some H₂O too
  8. Limewater reacts with some CO₂ to become milky (because limestone is produced)
  9. gg cycle repeats you’re back to limestone
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Chemistry Revision Exam Thing (6 decks)

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