Carbon Dioxide

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Last updated 2:56 PM on 6/13/26
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10 Terms

1
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What are the properties of carbon dioxide?

  • Sublimes at -76°C to form a solid called 'dry ice'

  • It dissolves in water to form a weakly acidic solution of carbonic acid (H2CO3)

  • It is more dense than air, so sinks and can be used in fire extinguishers to smother the fire and prevent oxygen from reaching the fuel

  • It absorbs infra-red radiation in its bonds, which means it behaves as a 'greenhouse gas' trapping heat in the atmosphere.

2
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What are the 5 chemical reactions that produce carbon dioxide?

  1. Respiration

  2. Combustion of hydrocarbon fuels

  3. Metal carbonates reacting with acid

  4. Thermal decomposition of metal carbonates

  5. Fermentation of sugar solution to produce ethanol (alcohol)

3
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What is an acronym to remember the 5 chemical reactions that produce carbon dioxide?

Rabbits

Can

Make

Tasty

Fudge

4
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What is the chemical and word equation for respiration?

glucose + oxygen —> carbon dioxide + water

C6H12O6 + 6O2 → 6CO2 + 6H2O

5
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What is the chemical and word equation of combustion of hydrocarbon fuels?

methane + oxygen → carbon dioxide + water

CH4 + 2O2 → CO2 + 2H2O

6
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What is the chemical and word equation of fermentation of sugar solution to produce ethanol (alcohol?)

sugar  ethanol + carbon dioxide

C6H12O6 → 2CH3CH2OH + 2CO2

 

The reaction needs to be done in an anaerobic environment (without oxygen).

7
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What is the chemical and word equation of combustion of metal carbonates reacting with acid?

eg calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide

CaCO3 + 2HCl → CaCl2 + H2O + CO2

8
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What is the chemical and word equation of thermal decomposition of metal carbonates?

Heat is used to break down a metal carbonate

eg copper carbonate → copper oxide + carbon dioxide

CuCO3 → CuO + CO2

 

9
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What are the observations of thermal decomposition of metal carbonates?

  • Colour changed from green to black

  • Limewater went cloudy

  • The mass decreased

  • The powder appeared to bubble

<ul><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">Colour changed from green to black</span></p></li><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">Limewater went cloudy</span></p></li><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">The mass decreased</span></p></li><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">The powder appeared to bubble</span></p></li></ul><p></p>
10
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What are the observations of metal carbonates reacting with acid?

  • the calcium carbonate effervesces

  • the limewater goes cloudy

<ul><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">the calcium carbonate effervesces</span></p></li><li><p><span style="font-family: &quot;Trebuchet MS&quot;;">the limewater goes cloudy</span></p></li></ul><p></p>