UA BSC 109 - Basic Chemistry and The Elements (3 pages)

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Basic Chemistry and The Elements



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Basic Chemistry and The Elements

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Types of bonds, parts of the atom, key elements of the periodic table


Lecture number:
2
Pages:
3
Type:
Lecture Note
School:
University of Alabama
Course:
Bsc 109 - Intro Biology Non Maj II
Edition:
1

Unformatted text preview:

BSC 109 1st Edition Lecture 2 Outline of Last Lecture I The characteristics of life II Living things are grouped according to characteristics III Defining features of humans IV Biological organization V Science as knowledge and a process VI The Cholera outbreak Outline of Current Lecture I All matter consists of elements II Atoms are the smallest functional unit that retains the properties of an element III IV V Elements Chemical bonds link atoms to form molecules Energy fuels life s activities Current Lecture I II All matter consists of elements A Matter 1 Anything that has mass and occupies space 2 Composed of elements B Elements 1 Cannot be broken down into a simpler form 2 Periodic table lists all known elements only need to know a few of them Atoms the smallest functional unit that retains the properties of an element A Proton 1 Positive charge 2 Determines element B Neutron 1 No charge 2 Determines isotope C Electron 1 Negative charge These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV V 2 Participates in chemical reactions 3 Outer shell electrons determine chemical behavior D Nucleus consists of neutrons and protons E Each element consists of one type of atom Elements A Of the 92 elements 25 are essential to life 1 Carbon 2 Hydrogen 3 Oxygen 4 Nitrogen B Trace elements occur in small amounts C Compound substance consisting of two or more elements in a fixed ratio 1 Iodine in salt prevents goiter 2 Fluoride in water prevents cavities Chemical bonds link atoms to form molecules A Chemical bonds attractive forces holding atoms together B Covalent bonds 1 Form when atoms share electrons equally or unequally 2 Results in each atom having a maximally filled outermost shell of electrons 3 It is the strongest of the chemical bonds 4 Example the bonds between hydrogen and oxygen in a molecule of water C Sharing electrons 1 Nonpolar covalent bonds electrons are



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