• first to provide exam data-mining in study guide • allow students to focus on most examined concepts – cut study time and increase efficiency • an exp

• according to syllabus for exam up to year 2016 • updated new questions from top schools from 2003 - end 2013 • complete encyclopedia of almost 800 quest

Oxygen exists in two gaseous (dioxygen and ozone) and six solid allotropic modifications. An additional allotropic modification of oxygen, the cyclooctaoxygen,

Research into the educational effectiveness of chemistry practical work has shown that the laboratory offers a unique mode of instruction, assessment and evalua