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