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Particles of Matter

Particles of Matter. EQ: How do I describe the smallest particles of an element?. Atoms. The smallest particle of an element. EQ: How do I describe the smallest particles of an element?. Democritus. A Greek

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Particles of Matter

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  1. Particles of Matter EQ: How do I describe the smallest particles of an element?

  2. Atoms • The smallest particle of an element EQ: How do I describe the smallest particles of an element?

  3. Democritus • A Greek • First to suggest that matter could be divided into pieces and that there is a time when they cannot be cut any further • Called the smallest pieces atomos which is Greek for “uncuttable” EQ: How do I describe the smallest particles of an element?

  4. Dalton • A teacher from 1802 • Proposed the atomic theory • His theory has five components EQ: How do I describe the smallest particles of an element?

  5. Dalton’s Ideas • Atoms can’t be broken into smaller pieces. • He imagined them as tiny marbles, impossible to break • In any element, all atoms are exactly alike. An element always has the same properties EQ: How do I describe the smallest particles of an element?

  6. Dalton’s Ideas • Atoms of two or more elements can combine to form a compound • Atoms of each element have a unique mass – still have not been able to measure the mass of individual atoms EQ: How do I describe the smallest particles of an element?

  7. Dalton’s ideas • The masses of the elements in a compound are always in constant ratio EQ: How do I describe the smallest particles of an element?

  8. Atoms and Molecules Today • Molecule – a group of atoms that are joined together act like a single unit • Chemical bond – the force that holds two atoms together EQ: How do I describe the smallest particles of an element?

  9. How small are atoms? • One sheet of paper is 10,000 atoms thick • So small only a scanning tunneling microscope can capture the image a device that "feels" the cloud of electrons that form the outer surface of atoms, rather as a phonograph needle feels the grooves in a record. EQ: How do I describe the smallest particles of an element?

  10. Particle Model • The way we explain matter in terms of atoms and molecules http://www.mcgrawhill.ca/school/applets/bcscience7/particle/index.htm EQ: How do I describe the smallest particles of an element?

  11. Class Work and Homework EQ: How do I describe the smallest particles of an element? • Fill In • What did I learn • Confused • Say • Read Particles of Matter in the folder • Answer questions 1 – 5, p. K 33

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