carbon dioxide. rag sheet & wordbank redambergreen (no idea) (some clue) (know it)
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Carbon dioxide
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RAG Sheet & WordBank
• Red Amber Green(No idea) (Some clue) (Know
it)
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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
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Preparation of Carbon dioxide• In reactions of air and oxygen:
• Very expensive way to manufacture CO2
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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
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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
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• Practical worksheet
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Properties of Carbon dioxide (MP)• Colourless, odourless, tasteless gas• Limewater (calcium hydroxide) turns milky
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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
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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
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• Practical worksheet
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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
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RAG Sheet & WordBank
• Red Amber Green(No idea) (Some clue) (Know
it)
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• Worksheet• Exam questions• Mind maps