In this latest quiz from C&EN, quizmaster Jessica Morrison tries to stump you with questions about the science and unfortunate history behind chemical warfare. The eight questions, which recognize the upcoming 100th anniversary of chemical weapons’ first use, are multiple-choice. When you’ve finished the quiz, you’ll have an opportunity to share your score on Facebook and Twitter. Go ahead! Impress us with your knowledge of chemical weapons. We promise not to alert the NSA.