Question

For each, provide a.type of reaction, b. Molecular equation (balanced), c.Net ionic equation.

1. Mercury(II) oxide and heat

2. Iron and oxygen (O2)

3. Water And sodium

4. potassium carbonate solution and calcium nitrate solution

5. silver nitrate solution and sodium chloride solution

6. Ammonium chloride solution and sodium sulfate solution

7. Potassium iodide solution and lead (II) nitrate solution

8. Sodium carbonate solution and hydrochloric acid

9. Potassium carbonate solution and acetic acid solution

10. Solid sodium bicarbonate and vinegar

11. Zinc strip and cupric sulfate solution

12. Copper strip and zinc sulfate solution

13.Magnesium metal and hydrochloric acid

14.Magnesium metal and acetic acid solution

15.Copper metal and acetic acid solution

Answer 1

1.

2HgO ----->2 Hg + O₂

Hg metal is obtained from from its oxide as metal lying below H in electrochemical series .

HgO = Hg²⁺ + O^-2

2Hg²⁺ + 4e^- =2Hg

2O^-2 - 4e^- = O₂

2.

Fe + O₂ ----------> Fe₂O₃ + Fe₃O₄

4Fe + 3O₂ ------> 2Fe₂O₃

3Fe+ 2O₂--------> Fe₃O₄

Net equation :

2Fe + 4e^- =2 Fe²⁺

3O₂ - 6e^- = 6O^2-

2Fe + 6O^2- = Fe₂O₃

3.

Water reacts with sodium by forming fire in water. Na can react easily as it can easily release a e^- and reacts with water and form NaOH and H₂ gas.

2Na + 2H-OH ------->2 NaOH + H₂

2Na -2 e^- =2 Na⁺

2H-OH =2H⁺ + 2OH^-

2H⁺ +2 e^- = 2H = H₂

Balance : 2Na + 2 H₂O =2 NaOH + H₂

4.

K₂CO₃ + Ca(NO₃)₂ ------> K₂NO₃ + CaCO₃

K₂CO₃= 2K⁺ + CO₃^2- -------(1)

Ca(NO₃)₂ = Ca²⁺ + NO₃^2- -------(2)

(1) + (2) ----->

CaCO₃ + k₂NO₃

Exchange reaction occurs