Respuesta :
Answer:Please see answer in explanation column
Explanation:
1.Cu(S) + 4HNO_3(aq) ----> Cu(NO_3)_2(aq) + 2NO_2(g) + 2H_2O(l)
2.Cu(NO_3)_2(aq) + 2Na(OH)_2(aq) ----> Cu(OH)_2(s) + 2NaNO3(aq)
3.Cu(OH)_2(s) {Heat}----> CuO(s) + H_2O(l)
4.CuO(s) + H_2SO_4(aq) ----->CuSO_4(aq) + H_2O(l)
5.CuSO_4(aq) + Zn(s) -----> Cu(s) + ZnSO_4(aq)
B)for Step 1
--Physical change can be seen when Reddish-Brown gas evolved and Copper dissolves and solution turns blue
- Chemival change occurs with the Formation of NO2 and Formation of Cu(NO3)2
Step 2
Physical change can be observed with Greenish-Blue ppt and the solution becomes colourless
chemical changes occurs with formation of Cu(OH)2 which precipitates and NaNO3 solution which is colorless
step 3
Physical change observed when the Precipitate turns black Chemical change occurs with Cu(OH)2 losing water to give CuO(black)
step 4
physical change observed when the Precipitate dissolves and solution becomes blue
Chemical change occurs with Formation of hydrated CuSO4 (blue solution)
STEP 5
Physical change is observed with Brown ppt and Zinc dissolves
Chemical change occurs when Solid Cu formed and Zinc replaces copper from its solution.
c) Precipitation depends on solubility of compound, from the reaction, we can find out that;
Cu(OH)2, CuO and solid Cu precipitate because they have very low solubility in water.
Cu(NO3)2 and CuSO4 do not precipitate but remain in the solutrion because they are very soluble in water.
In the copper cycle some of the compounds formed precipitates as they have low solubility as compared to other compounds which have more solubility.
What is physical properties?
Physical properties are those properties which are changes from one substance to another and are observable from simple eyes.
Copper cycle is the biogeochemical exchange cycle of copper which is present naturally and anthropogenic between different reservoirs. Following steps are involved in this cycle:
- Step 1
In this step formation of Cu(NO₃)₂ takes place in addition with evolution of reddish-brown NO₂ gas which shows the physical change, and also blue color of solution shows the physical change.
Cu(S) + 4HNO₃(aq) → Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)
- Step 2
In this step formation of Greenish-Blue ppt of Cu(OH)₂ and colorless solution of NaNO₃ is obtained.
Cu(NO₃)₂(aq) + 2Na(OH)₂(aq) → Cu(OH)₂(s) + 2NaNO₃(aq)
- Step 3
In this step on heating Greenish-Blue ppt of Cu(OH)₂ we obtain black ppt of CuO(s).
Cu(OH)₂(s) → CuO(s) + H₂O(l)
- Step 4
In this step black ppt of CuO gets dissolve and show the formation of blue color of hydrated CuSO₄.
CuO(s) + H₂SO₄(aq) → CuSO₄(aq) + H₂O(l)
- Step 5
In this step zinc displaces copper from their solution as a result of which formation of brown color ppt of copper takes place, and we get the original copper from this cycle.
CuSO₄(aq) + Zn(s) → Cu(s) + ZnSO₄(aq)
Hence, some formed precipitate because of their less solubility.
To know more about copper cycle, visit the below link:
https://brainly.com/question/15180044
