The one true aim of our programmes is help our students become better English speakers. Lessons are fun, interactive and designed to be effective in a short period of time.
The azide ion (N3– ) is one of those chemical entities that just plain looks weird. Three nitrogens…
Toefl 24 classes
Tel: 123 123 123
Mobile: 234 234 234
Please contact us through facebook, tweeter
or see our work on instagram
© 2018 Online Chemistry tutor.