BIO 101 Chapter 3 Notes.docx

BIO 101 Chapter 3 Notes.docx - BIO 101 Chapter 3...

This preview shows page 1 - 2 out of 4 pages.

BIO 101 Chapter 3 “Complexity 1: Versatile Elemental Structure” Notes 3.1 A Brief History of Understanding Matter Revealing Matter’s Complexity 1. For many years, one major activity of scientists has been to develop ways of sorting out the pure components parts or elemental substances from these mixtures. 2. The smallest unit bit of a compound that retains all the properties of that compound is called a Molecule . 3. Elements cannot be degraded any further by chemical or physical means. Revealing Continuity Between Living and Nonliving Matter 1. Friederich Wohler synthesized Urea from simpler substances that were known to be nonliving. a. It had long been thought that when living things were created, an entirely separate realm of (more sophisticated) “organic” components must have been used. b. These components were supposed by some to explain the sense of self humans seemed to have. 3.2 Atomic Structure What’s an Atom? 1. The term atom comes from the Greek Atomos , which means “unable to be cut”. a. In reality, the atom is made up of even smaller subatomic particles. What are Its Parts? 1. An atom consists of a dense, centrally positioned Nucleus with a cloud of negatively charged Electrons spinning around it. a. The Nucleus holds a collection of positively charged particles called Protons , and neutrally charged particles called Neutrons . 2. Protons and electrons have a net charge. a. This word (charge) means that these tiny particles have electrical properties. b. Since each electron has a unit negative charge, it continually orbits the nucleus to which it is attracted by the positively charged protons found there. c. Electrical neutrality is maintained because the number of protons in the nucleus equals the number of electrons in the cloud above the nucleus. 3. If the number of electrons and protons ever becomes unequal, then the entire atom takes on a net electrical charge and is called an ion . 4. The electron shell closest to the nucleus has the capacity for two electrons.
Image of page 1

Subscribe to view the full document.

Image of page 2

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern