Chemical Context Of Life Essay
Name: Roya Razmjou AP Biology Chapter 2 Active Reading Guide 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. Section 1 1. Define and give an example of the following terms: Term Definition matter: anything that has shape and takes up space element: a single substance that cannot be broken down into other substances by a chemical reaction compound: a substance that is made up of a ratio of two or more elements What four elements make up 96% of all living matter? Carbon, oxygen, nitrogen and hydrogen make up 96% of all living
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For example, the element carbon has three naturally occurring isotopes. The most common of the three is carbon-12 is accountable for 99% of of the carbon that is found in nature. Carbon-12 has 6 neutrons. Another isotope of carbon, carbon-13, has 7 neutrons. The least common isotope of carbon, which is carbon-14, has 8 neutrons. All three isotopes of carbon have 6 protons, which makes them a carbon atom. Explain radioactive isotopes and one medical application that uses them. A radioactive isotope is an unstable isotope whose nucleus decays spontaneously, which in turn gives off energy and particles. This decay usually leads to a change in the number of protons found in the atom, in which the original atom is converted into an atom of a different element. An example of this is the decaying of a radioactive carbon. When it decays, the carbon becomes nitrogen. Radioactive isotopes can be used in medicine as radioactive tracers. For example, some kidney disorders can be diagnosed by injecting a small dose of a liquid, that contains these radioactive
For example, the element carbon has three naturally occurring isotopes. The most common of the three is carbon-12 is accountable for 99% of of the carbon that is found in nature. Carbon-12 has 6 neutrons. Another isotope of carbon, carbon-13, has 7 neutrons. The least common isotope of carbon, which is carbon-14, has 8 neutrons. All three isotopes of carbon have 6 protons, which makes them a carbon atom. Explain radioactive isotopes and one medical application that uses them. A radioactive isotope is an unstable isotope whose nucleus decays spontaneously, which in turn gives off energy and particles. This decay usually leads to a change in the number of protons found in the atom, in which the original atom is converted into an atom of a different element. An example of this is the decaying of a radioactive carbon. When it decays, the carbon becomes nitrogen. Radioactive isotopes can be used in medicine as radioactive tracers. For example, some kidney disorders can be diagnosed by injecting a small dose of a liquid, that contains these radioactive