Carbon dioxide
RAG Sheet & WordBank
• Red Amber Green(No idea) (Some clue) (Know
it)
What do you know about CO2?– < 1% of air is CO2
– Plants used CO2 for photosynthesis
– Without photosynthesis, no food for animals and for humans
Preparation of Carbon dioxide• In reactions of air and oxygen:
• Very expensive way to manufacture CO2
Preparation of Carbon dioxide (MP)• Reaction between dilute hydrochloric acid and
marble chips– Marble chips = calcium carbonate = CaCO3
• Word equation:Calcium Carbonate + hydrochloric acid
Calcium chloride + water + carbon dioxideFormula equation (HL):
CaCO3 + HCl CaCl2 + H2O + CO2
• CO2 collected by the upward displacement of air
Preparation of Carbon dioxide (MP)• Main steps:
1. Dilute HCl is dropped onto marble chips, enough to keep chips fizzing
2. Jars of gas collected
• Practical worksheet
Properties of Carbon dioxide (MP)• Colourless, odourless, tasteless gas• Limewater (calcium hydroxide) turns milky
Properties of Carbon dioxide (MP)• Colourless, odourless, tasteless gas• Limewater (calcium hydroxide) turns milky• Word equation:Calcium Hydroxide + carbon dioxide
chalk + water
• Formula equation (HL)Ca(OH)2 + CO2 CaCO3 + H20• Carbon dioxide + water turns blue litmus paper red • acidic gas (carbonic acid)• Carbon dioxide quenches a burning split• Denser then air
Properties of CO2 - SummaryPhysical Properties Chemical PropertiesColourless, odourless, tasteless gas
Does not supports combustion
Slight soluble in water Turns limewater milky
More dense then air Dissolves in water to form carbonic acid
• Practical worksheet
Uses of CO2
• Fizzy drinks– CO2 under pressure provides fizz when opened
• Fire Extinguishers– Ideal as more dense then air and does not support
combustion
• Refrigeration– Dry ice, CO2 gas under pressure turns into white solid.
– Sublimes – used in transportation of food
• Special effects in concerts
RAG Sheet & WordBank
• Red Amber Green(No idea) (Some clue) (Know
it)
• Worksheet• Exam questions• Mind maps
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