Подчеркните причастия, определите какая форма причастия употребляется.Обратите внимание на

Подчеркните причастия, определите какая форма причастия употребляется.Обратите внимание на самостоятельный сопричастный оборот.
7)Substances attacked by moisture should be kept dry .
8)The elements of group i referred to collectively as the sodium family and as alkali metals are among the most chemically active metals.
9) When considering solvent extraction commonly available extractants should be first taken into amount.
10) Having prepared some nearly black amorphous sulphur in the laboratory and examined it the following week the students noticed that it had become brittle and much lighter in colour.