Chapter 2 - Chapter 2 10-Nov-16 10:04 PM Chapter 2 The...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 2 10-Nov-16 10:04 PM Chapter 2 The Chemical Level of Organization Preliminary notes on Chapter: Oxygen, carbon, hydrogen, nitrogen make up 96% of body mass Number of protons = atomic number Mass number = protons and neutrons Same number of protons, different number of neutrons is same atom, but different weights - considered isotope Atomic mass of element is average mass of all isotopes If two atoms share an electron, forms a molecule Compounds consist of two of more types of atoms Free radical: atom with unpaired electron in outer shell ATP couples endergonic (require energy) and exergonic (releases energy) reactions Most catalysts in living systems are enzymes; protein molecules Ionic bonds: attraction of ions of opposite charges Atoms are stable when they have eight electrons in outermost shell Covalent: share pair of valenc electrons When hydrogen forms polar covalent bong w/ oxygen atom or nitrogen atom, hydrogen will have a parial positive charge, allowing it to hydrogen bond Synthesis reactions are usually endergonic; anabolic Inorganic compounds lack carbon, usually small Organic compounds contain carbon, usually hydrogen, always have covalent bonds Water is most abundent supstance, seves as a lubricant; high capcity for absorbing heat and high heat of vaporization Salts ionieze into neitehr H nore OH Mole: amount in grams of a substance that has a mass equalt to the combined atomic mass of all its atoms Objectives After completing this chapter, you should be able to
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
1 identify, by name and symbol, the principal chemical elements of the human body. 1 26 elements present in human body 1 4 compose 96% - the major elements 1 Hydrogen 2 Carbon 3 Oxygen a 65% of body mass 2 Nitrogren 2 8 compose 3.6% - lesser elements 1 Calcium 2 Phosphorus (P_ 3 Pottasium 4 Sulfur 5 Sodium 6 Chlorine 7 Magnesium 8 Iron 2 The rest are trace elements 2 describe the basic structure of an atom, ion, molecule and compound. 1 Atoms: smallest units of matter that retain the properties and characteristics of an element 1 Composed of subatomic particles: 1 Protons: Neutrons; netral; reside in nucleus 2 Electrons: Keywords and Topics Make certain that you can define, and use in context, each of the terms listed below, and that you understand the significance of each of the concepts. 1 Identify, by name and symbol, the principal chemical elements of the human body. 1 chemical element 2 chemical symbol 3 major elements 1 26 elements present in human body 1 4 compose 96% - the major elements 1 Hydrogen 2 Carbon 3 Oxygen a 65% of body mass 2 Nitrogren 2 8 compose 3.6% - lesser elements 1 Calcium 2 Phosphorus (P_ 3 Pottasium 4 Sulfur 5 Sodium
Image of page 2
6 Chlorine 7 Magnesium 8 Iron 2 Describe the basic structure of an atom, ion, molecule, compound and free radicle. 1 atom 2 subatomic particles 1 nucleus 1 Proton: reside in nucleus; positively charged 2 Neutron: netral; reside in nucleus 2 Electrons: negatively charged; move around in space around nucleus, primarily in regions called electron shells 1 electron shells 1 First electron shell holds up to 2 electrons 2
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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