Science Report on Copper
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 …show more content…
-In stage 1 the copper dissolved completely and the solution went blue, a toxic gas was also formed.
Cu(s) + 4HNO3(aq) ( Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)
-In stage 2 the blue colour turned lighter and the solution heated up.
Cu(NO3)2(aq) + 2NaOH(aq) ( Cu(OH)2(s) + 2NaNO3(aq)
- In stage 3 the colour of the solution changed once again, it went from light blue to dark blue, a solid was formed.
Cu(OH)2(s) J( CuO(s) + H2O(g)
-In stage 4 a substance disappeared and the solution turned into a teal colour.
CuO(s) + H2SO4(aq) ( CuSO4(aq) + H2O(l)
-In stage 5 the liquid went clear, a new solid formed and a chlorine gas formed.
Cu+2(aq) + Zn(s) ( Cu(s) + Zn+2(aq)
After going through that many chemical changes the copper remains the same. The copper found in stage 6 is small, shiny, it has a brown-orange colour, it’s mass is 1.6g. It looks and weights exactly like the copper at the beginning of the experiment. It proves that the law of conservation of matter is