Learning experiments with simple and inexpensive materials at middle school 7th and 8th grades

Experiments with simple and inexpensive materials: physics, chemistry and biology that can be used in these experiments material samples; experimenting with simple and inexpensive materials; the place of technology in the lab; determining the scientific process skills to be gained in experiments; Middle school 7th and 8th grade Physics, chemistry, biology planning various experiments based on different laboratory approaches appropriate to the nature of the subjects, implementation and reporting; the approaches to be used in the evaluation of student performances (knowledge, skill, attitude-value) in experiments