The law of conservation of mass means that the atoms of an object cannot be created or destroyed, but can be moved around and be changed into different particles. This law says that when a chemical reaction makes two different atoms into a new product, the mass will be the same. Knowing this the mass of the copper should be the same at the beginning and at the end of the experiment.
In this investigation we will see some chemical changes such as formation of gas, temperature changes, solid formed, color change occurs or a new odor produced and physical changes such as freezing, melting, dissolving evaporating.
Copper is a widely used metal, it is use in door handles, cooking pots, cars, swimming pool and hot tubes to control the yeast.
Physical and chemical properties of copper:
• Symbol : Cu
• Atomic number: 29
• Highly electrical and thermal conductivity
• State at room temperature : Solid
• Brownish red colour
• Melting point : 1083 C
• Density : 8.93 g cm2
• Boiling point : 2595 C
Copper is find in ores, an ore is a type of rock that contains minerals with important elements including metals, there is a lot of different copper ores such as Chalcopyrite, Covellite, Malachite, Azurite:
|Mineral |Formula |Appearance |% copper in |
| | | |mineral |
|Bornite |Cu5FeS4 |Golden brown, metallic |63 |
|Malachite |CuCO3Cu(OH)4 |Bright green, earthy |58 |
|Azurite |2CuCO3Cu(OH)4 |Blue,