Helium

Name Period Chapter 2: The Chemical Context of Life This chapter covers the basics that you may have learned in your chemistry class. Whether your teacher goes over this chapter, or assigns it for you to review on your own, the questions that follow should help you focus on the most important points. Concept 2.1 Matter consists of chemical elements in pure form and in combinations called compounds Define and give an example of the following terms: matter: element: compound: What four elements make up 96% of all living matter? What is the difference between an essential element and a trace element? essential element: trace element: Concept 2.2 An element?s properties depend on the structure of its atoms