. Explain with examples following characteristics of chemical reactions:   a. Change of colour  b. Evolution of gas  c. Change of smell  d. Change of state

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.

what are the statements

the objects have the same charge is correct.

nathan lee