Production of oxygen O2
Hydrogen peroxide ---manganese dioxide (catalyst)---> water + oxygen.
2H2O2 ---MnO2---> 2H2O + O2
Proof of oxygen: relights a glowing splint.
Carbon (charcoal) burned in oxygen:
C + O2 ---> CO2 : This is an acidic oxide.
Magnesium burned in oxygen:
2Mg + O2 ---> 2MgO : This is a basic oxide.
Production of CO2, carbon dioxide (denser than air, can be poured)
Calcium Carbonate (marble chips) + Hydrochloric acid ---> Calcium chloride + water + carbon dioxide
CaCO3 + 2Hcl ---> CaCl2 + H2O + CO2
Proof: quenches a lighted splint.
Limewater + carbon dioxide ---> Chalk + Water
Ca(OH)2 + CO2 --->CaCO3 +H2O
Carbon dioxide + water ---> Carbonic acid (acid rain)
CO2 + H2O ---> H2CO3
Production of hydrogen, H2 (colourless, odourless, highly reactive gas)
Zinc + Hydrochloric acid = Zinc chloride + Hydrogen
Zn + 2HCl = ZnCl2 + H2
Proof of hydrogen: Popping noise with a lighted splint.
Carbon dioxide in air dissolves in rainwater
CO2 + H2O ---> H2CO3 (carbonic acid)
Sulfur dioxide (SO2) from factories and cars burning fossil fuels SO2 then dissolves into rainwater
SO2 + H2O ---> H2SO3 (sulfurous acid)
Fossil fuels are hydrocarbons containing hydrogen and carbon.
Iron + oxygen + water = iron oxide
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You might as well just tell us what's coming up
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does anyone know what's on the exam craft exam
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