1. A chemical substance gives hydrogen ion and chloride ion when dissolved in water. Similarly, another chemical substance gives sodium ion and hydroxide ion. Write their molecular formula
and also chemical reaction between them.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

m=9

step-by-step explanation: