Question

1. a blue powder is mixed into water. when stirred, a blue solution is produced no visible solids left. later, the solution is put into an evaporating dish and he until all the liquid evaporates. the original blue powder is left behind in the d is this an example of chemical change, physical change, or both? (1)
2. what was then name given to ancient philosophers who thought about the world (vs. other philosophers who thought about ideas like the meaning of ethics etc.). (1)
3. empedocles and democritus were to two early greek philosophers who h about the nature of matter. state these two differing ideas. (1)

Explanation:

8.

A physical change alters the form or state of matter without changing its chemical composition. Mixing the powder in water and evaporating the water are physical processes as the powder's chemical identity remains the same.

Ancient philosophers who thought about the nature of the world were called natural - philosophers. They focused on understanding natural phenomena.

Empedocles proposed that all matter was made up of four elements: earth, air, fire, and water. Democritus believed matter was composed of tiny, indivisible particles called atoms.

Answer:

Physical change

9.