ch.2 notes

ch.2 notes - 9/6/2009 Atoms,!Molecules!and!Ions Chapter!2

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
9/6/2009 1 Atoms, Molecules and Ions Chapter 2 (Students are responsible for 1 reading units 2.1 " 2.2) What are the Goals (Chapter 2)? Understand what an atom is. Understand the structure of an atom . Learn what atomic weights are. Introduce the periodic table and some basic information it includes Learn the relationship between atoms, elements, compounds and molecules. Learn what ions are, what ionic compounds are and how they are named. Introduce what organic chemistry and organic molecules are.
Background image of page 1

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

View Full DocumentRight Arrow Icon
9/6/2009 2 Where are the atoms in this representation of a compound? In this drawing, what do the different colors mean? http://www.udel.edu/chem/white/C647/Penicillin.gif Penicillin Is this an ionic compound or an organic molecule? Chemical Composition of the World: Atoms 101 !"#$ “indivisible, uncuttable” All matter is composed of atoms which cannot be further split into smaller portions Atoms are completely solid Atoms are homogeneous, with no internal structure Between atoms there is empty space Atoms differ in size Democritus ( c .460 ! c .370 B.C.)
Background image of page 2
9/6/2009 3 Chemical Composition of the World: Atoms 200 Each element is composed of extremely small particles called atoms. All t f i lt id ti l t All atoms of a given element are identical to one another in mass and other properties, but the atoms of one element are different from the atoms of other elements. The atoms of one element cannot be changed into atoms of a different element by chemical reactions; atoms are neither created or John Dalton (1766 " 1844) destroyed in chemical reactions. Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms.
Background image of page 3

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

View Full DocumentRight Arrow Icon
9/6/2009 4 Chemical Composition of the World: Atoms 300 Thomson’s “plum pudding” model Electrons embedded in a shell of positive charge Rutherford’ mode Rutherford s model Electrons randomly circulating around nucleus made of protons Rutherford’s Experiment – How does it support his hypothesis for atomic structure rather than Thomson’s?
Background image of page 4
9/6/2009 5 The Modern Atom Most of the atom is empty space. Au foil Atomic radius = ~ 10 " 10 m Nuclear radius = ~ 10 " 15 m Volume ratio: V Atom : V Nucleus = ~ 10 15 ! Atoms, Molecules and Ions The Modern Atom The atom is made up of three fundamental particles: The proton ,p + The neutron ,n 0 The electron ,e " Nearly all of the mass of } Nuclear the atom is contained in the nucleus Nucleus
Background image of page 5

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

View Full DocumentRight Arrow Icon
9/6/2009 6 Atoms, Molecules and Ions The Modern Atom proton neutron electron Mass/ kg 1.67x10 " 27 1.675x10 " 27 9.1x10 " 31 Charge* +1 0 " 1 Location Nucleus Nucleus Atom Stability Stable Unstable Stable outside the nucleus * In units of 1.6 x 10 " 19 C Atoms, Molecules and Ions The Modern Atom " Structure A Small Dense Nucleus Nuclear Radius: ~ 10 " 15 m (1 fm) Density of the nucleus: ~ 100,000,000,000,000 g # cm " 3 (Density of water = 1 g # cm " 3 ) The mass of theelectron is ~ 1/2000 that of the proton and neutron – most of the mass of the atom is in the nucleus
Background image of page 6
9/6/2009 7 Atoms, Molecules and Ions The Four Forces of Nature There are only four fundamental forces found in Nature Nature.
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/11/2010 for the course CHEM 1201 taught by Professor Cook during the Spring '08 term at LSU.

Page1 / 47

ch.2 notes - 9/6/2009 Atoms,!Molecules!and!Ions Chapter!2

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online