Write the equation for any chemical change that occured in these steps: 1. Place

ID: 483650 • Letter: W

Question

Write the equation for any chemical change that occured in these steps:

1. Place 2 to 3 small pieces of copper(II) nitrate into an uncovered cruicible. Now heat the copper(II) nitrate strongly under the fume hood.

2. Heat magnesium ribbon in flame of burned.

3. Aluminum wire in the hottest part of the flame and hold there for a few seconds.

4. copper foil heated in the hottest part of the flame for a few minuites.

5. Add 15 drops of 0.1 M calcium choloride(CaCl2) solution to a test tube, now add 15 drops of 0.1 M sodium carbonate (Na2CO3).

6. Add a small amount of solid calium carbonate (caCO3) to a test tube, then add 30 drops of diute hydrocholic acid (HCl)

7. Add 15 drops of 0.1 M sodium iodide (Nal) solution to a test tube, then add 15 drops bromine water (Br2) solution.

1) Upon heating CuII nitrate fumes of NO2 are obtained and CuO is formed

2Cu(NO3)2 ======> 2CuO + 4NO2 + O2

2) Mg on burning form MgO

2Mg + O2 ======> 2MgO

3) Al on heating at such high temperature get burned and form Al2O3

4Al + 3O2 =======> 2Al2O3

4) 2 Cu + O2 =======> 2CuO

5) CaCl2 + Na2CO3 ======> CaCO3 + 2NaCl

Net reaction Ca2+ + CO3 2- ======> CaCO3

6) CaCO3 + 2HCl ======> H2O + CO2 + CaCl2

7) 2NaI + Br2 =======> 2NaBr + I2

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