Answer:
A chemical reaction that has a positive ΔH is said to be endothermic , while a chemical reaction that has a negative ΔH is said to be exothermic . What does it mean if the ΔH of a process is positive? It means that the system in which the chemical reaction is occurring is gaining energy.
Answer:
a way in which something is usually done, especially within a particular area or activity.
Explanation:
In the 5th century BC, Democritus of Abdera proposed the idea of an atom, which was advanced as the smallest, individual particles
