TASK DEFINITION: Given a scientific question, generate a correct answer to it.
PROBLEM: A change in one or more physical properties of matter without any change in chemical properties is called what?

SOLUTION: physical change

PROBLEM: What do halogens require electrons to achieve?

SOLUTION: octet

PROBLEM: Chemical equations in which heat is shown as either a reactant or a product are called what?

SOLUTION:
thermochemical equations