Exothermic reaction for std 8 to 10

To measure the change in chemical reactions and conclude whether the reaction is exothermic or endothermic.

AIM : To measure the change in chemical reactions and conclude whether the reaction is exothermic or endothermic.

THEORY : During the chemical reaction if the temperature increases the reaction is exothermic and if temperature decreases the reaction is endothermic.

APPARATUS : Conical flask, 250 ml. Beaker, Stand, Thermometer, Glass rod, measuring cylinder, stirrer.

MATERIAL : Dilute hydrochloric acid, Zinc metal, Solid ammonium chloride,

Exothermic reaction

Observation : 

(1) initial temperature of dilute hydrochloric acid 0 C.
(2) Temperature of the mixture when Zinc metal dissolves in hydrochloric acid = 0 C.
(3) Difference of temperature = 0 C.
(4) Give chemical reaction of Zinc metal with hydrochloric acid.

NOTE :

 (1) Similarly heat of neutralization in neutralization reaction between dilute hydrochloric acid and sodium hydroxide can be measured.
(2) The increase in temperature can be noted when dissolution of solid sodium hydroxide in water is carried out.

PRACTICAL USES

The combustion reactions of kerosene, 

Petrol, 

LPG are exothermic, 

therefore these substance are used as fuel.

more Video presentation:

Exothermic reaction animation video