Which of the following is TRUE about ideal gas particles?
A. They move in random directions.
B. They are very large.
C. They have high intermolecular forces.
D. They have inelastic collisions.
E. They always move in straight lines.

The answer is A.

Explanation:

Gas particles do not have a fixed position or volume so they move in random speed and directions.

(Correct me if I am wrong)

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.