The atmosphere Flashcards
Air
A mixture of gases
Air is composed of
20% oxygen
78% nitrogen
1-2% other gases
Test for water
Cobalt chloride paper goes from blue to pink
Anhydrous copper sophistry goes from white to blue
A catalyst
A chemical that speeds up a chemical reaction without being used up in that reaction
E.g:manganese dioxide
Properties of oxygen
A colourless, tasteless, odourless gas Denser than air Soluble in water Neutral Ignites a glowing splint Turns limewater milky
To prepare oxygen Equation
Hydrogen Peroxide —>(manganese dioxide)—>oxygen and water
2H202—>MnO2—>02+2H2O
Uses of oxygen
Breathing
Steel making
To prepare Carbon dioxide
Hydrochloric acid + calcium carbonate—>Calcium Chloride + water+carbon dioxide
2HCl+CaCO3—>CaCl2+H2O+CO2
Properties of carbon dioxide
Colourless, odourless,tasteless gas
Acidic gas
Doesn’t supports combustion
Turns limewater milky
Atmosphere
A layer of gases that extends about the surface of the earth
Uses of CO2
Refrigeration
Fizzy drinks
Fire extinguishers
Stage effects
