Question

NaOH + H2SO4 --- Na2SO4 + H2O ZnO + HNO3 --- Zn(NO3)2 + H2O CuCl2 + Na2S ---- NaCl + CuS H2O2 --- H2O + O2 HgO ---- Hg + O2

Answer 1

(1) 2NaOH + H2SO4 → Na2SO4 + 2H2O.

(2) ZnO + 2HNO3 → Zn(NO3)2 + H2O.

(3) CuCl2 + Na2S → CuS + 2NaCl.

(4) 2H2O2 → 2H2O + O2.

(5) 2HgO → 2Hg + O2.

Answer 2

The equations you provided are chemical equations representing various reactions. Let's break them down:

1. NaOH + H2SO4 → Na2SO4 + H2O: This equation represents a neutralization reaction between sodium hydroxide (NaOH) and sulfuric acid (H2SO4). The products are sodium sulfate (Na2SO4) and water (H2O).

2. ZnO + HNO3 → Zn(NO3)2 + H2O: This equation represents a reaction between zinc oxide (ZnO) and nitric acid (HNO3). The products are zinc nitrate (Zn(NO3)2) and water (H2O).

3. CuCl2 + Na2S → NaCl + CuS: This equation represents a double displacement reaction between copper(II) chloride (CuCl2) and sodium sulfide (Na2S). The products are sodium chloride (NaCl) and copper(II) sulfide (CuS).

4. H2O2 → H2O + O2: This equation represents the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2).

5. HgO → Hg + O2: This equation represents the decomposition of mercury(II) oxide (HgO) into mercury (Hg) and oxygen gas (O2).

These reactions represent various types of chemical reactions, including neutralization, decomposition, and double displacement reactions.