Gaseous mixtures . Question 1 options: can only contain molecules must contain both isolated atoms and molecules are all homogeneous are all heterogeneous can only contain isolated atoms

Must contain isolated both isolated atoms and molecules

Explanation:

There is very little intermolecular forces of attraction between atoms and molecules of a gas.

Hence in a gas mixture; We mostly find isolated atoms and molecules with minimal interaction with each other, hence the answer.

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.