i:i understand the structure of matter. 1. what is a model and how do scientists use them? reality...
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I:I Understand the structure of matter
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1. What is a model and how do scientists use them?
• Reality is complex.• Study as a whole.• Make predictions.• Only a
representation.
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2. How small is an atom?
a. The width of one hair is one million atoms.b. An atom is as small as a cell.c. You can see atoms through our classroom microscopes.
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3. What do scientists use models for?
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4. How are models limited in how they present information?
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5. What did previous scientists do and what were their contributions to help develop the atomic theory and our current model of an atom.• ..
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Scientists add to theory of atomDemocritus 450 BC
Aristotle 350 BC
Dalton 1800
Thomson 1897
Rutherford 1899
Bohr 1913
Uncuttable = ‘atomos’
Setback for 2000 years
Gas experiments showed that tiny particles combine.
Vacuum tube showed negative charges.
Gold Foil experiments found nucleus.
Fixed energy levels.
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6. What is the electron cloud?
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7. Where are the following located: • a. nucleus
• b. electrons• c. neutrons• d. protons
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8. What is a periodic table?
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9. Who is Dimitri Mendeleev & what did he do?
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10. What is the difference between (a)molecules & (b)compounds?
Hydrogen H2
Oxygen 02
Nitrogen N2
Water H20
Carbon Dioxide C02
Methane CH4
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11. What are the main properties of solid, liquid and gas?
(a) No definite shape, but definite volume.(b) No definite shape, no definite volume. (c) Definite shape, but definite volume.