Experimental activity

Experimental activity chemisty VIII th grade

chemisty VIII th grade

OxidesOxides propertiesproperties

Materials necessaryMaterials necessary

TTubes, support tubes, pipette, spoon substancesubes, support tubes, pipette, spoon substanceshydrochloric acidic, calciumhydrochloric acidic, calcium oxide, oxide, copper oxide, phenolphthaleincopper oxide, phenolphthalein and water.and water.

Calcium oxide reacts with water. Form calcium Calcium oxide reacts with water. Form calcium hydroxide and heat.The reaction is also known off of lime.hydroxide and heat.The reaction is also known off of lime.

Ca O + HCa O + H22O → Ca(OH)O → Ca(OH)2 2 + Q ; + Q ; Q = heat

Calcium hydroxide is a base.Calcium hydroxide is a base.Phenolphthalein is colored red - carmine.Phenolphthalein is colored red - carmine.

The reaction of calcium oxide with hydrochloric acid.The reaction of calcium oxide with hydrochloric acid.Form calcium chloride and water. Calcium chloride is white.Form calcium chloride and water. Calcium chloride is white.

CaO + 2HCl → CaClCaO + 2HCl → CaCl22 + H + H22OO

Reaction of copper oxide with hydrochloric acid.Reaction of copper oxide with hydrochloric acid.

CuO + 2 HCl → CuClCuO + 2 HCl → CuCl22 + H + H22OO

→ → CuClCuCl2 green colors2 green colors

Earth Treasures!

Earth Treasures!

Earth TreasuresEarth Treasures!!

Using oxidesUsing oxidesUsing oxides:Using oxides:

• pigments, colorants lead oxides, Fe, Cr, Zn;• pigments, colorants lead oxides, Fe, Cr, Zn;

• obtaining soda, fizzy drinks CO2;• obtaining soda, fizzy drinks CO2;

• construction; catalysts: MnO2, V2O5;• construction; catalysts: MnO2, V2O5;

• obtain cast iron, steel, aluminum;• obtain cast iron, steel, aluminum;

• plant photosynthesis, extracting beer barrels• plant photosynthesis, extracting beer barrels

• fire fighting; fertilizer.• fire fighting; fertilizer.