Copper is a good conductor of electricity. Alcohol can be burned in an engine. Salt dissolves in water. No processes are exothermic. One process is exothermic.
All processes are exothermic.
The properties of chemical compounds are different from those of the elements from which they are formed. The Law of Definite Composition states that the physical state of a compound is dependent on the chemical composition of that compound. A mixture of oil and salt water is a homogeneous mixture. One statement is true. No statements are true.