Chemistry Equations

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.


Acid Rain:

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.


Rust:

Iron + oxygen + water = iron oxide