Question

Give 5 examples of change in temperature during chemical reaction with chemical equation..??

Answer 1

Answer:

1) cao+H2o ----------)ca(oH)2.

2)zn+H2SO4----------)znSo4+H2.

3)caco3----------)cao+ co2.

4)Na+Hcl----------)Nacl+H2+Heat.

5)Mg+H2so4---------)Mgso4+H2+heat

Answer 2

Most exothermic reactions change the temperature of their surroundings due to liberation of hear. Examples are-

• Formation of Zinc Sulphate: It is a simple displacement reaction which releases heat during formation of metal bonds. Zn+H2SO4→ZnSO4+H2+heat
• Formation of slaked lime: CaO reacts with water to give Ca(OH)2 with liberation of heat. CaO+H2O→Ca(OH)2+heat
• Production of ammonia gas: Nitrogen and hydrogen combine in a ratio of 3:5 to give ammonia gs with liberation of heat. N2+(3)H2→(2)NH3+heat
• Combustion of Methane: Methane gas burns in the presence of oxygen to liberate CO2 and hear. CH4+O2→Co2+H2O+heat
• Neutralization reaction: Sodium hydroxide reacts with dil. HCl to form a salt and releases heat. NaOH+dil.HCl→NaCl+H2O+heat