Question

What happen when ,
Zinc is heated with dilute hydrochloric acid .
Sodium bicarbonate is strongly heated .
Exccess of co2 is passed through line water .
Gypsum is heated to 100 C

Answer 1

HCl is the chemical formula that represents hydrochloric acid. The metal zinc readily reacts with hydrochloric acid to produce hydrogen gas (H2) and zinc chloride (ZnCl2). Every chemical reaction either produces or absorbs heat. In chemistry this effect is described as the reaction enthalpy. The zinc reaction produces the heat and hence has the negative enthalpy.