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Steps of Scientific Method

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Presentation on theme: "Steps of Scientific Method"— Presentation transcript:

1 Steps of Scientific Method
Experimental variables ? What does experiment do? Scientific Theory vs. Law?

2 Chpt 2 - Atoms, Molecules and Ions
Atomic Theory - Greeks and Dalton Advances in theory (Sci Method works) Thomson Millikan Rutherford Chadwick Molecules and Ions Periodic Table - design, group names

3 J J Thomson Postulated the existence of electrons using cathode-ray tubes. Determined the charge-to-mass ratio of an electron.

4 Cathode Ray with Field

5 R. S. Millikan Performed experiments involving charged oil drops.
Determined the magnitude of the charge on a single electron. Calculated the mass of the electron.

6 E. Rutherford Atom has a dense center of positive charge called the nucleus. Electrons travel around the nucleus at a relatively large distance.

7 Atomic / Nucleus Size

8 Chadwick Novel experiment to discover missing mass in the atom (nucleus) Why difficult to observe?

9 Periodic Table Who ? How is it organized? Know the group and
series names, metals, nonmetals, metalloids, solids, liquids, gases

10 Chpt 2 - Nomenclature Names <-> Chemical formulas
Binary and Polyatomic Ionic per -ate, -ate, -ite, hypo -ite Roman numerals ( ) if necessary in the formula Molecules (prefixes) Acids Without oxygen With oxygen

11 Nomenclature Metal 1st -> ionic compound
Binary - Metal retains its name nonmetal ends -ide Know the normal charges to combine -make neutral Use roman numerals for charge on transition elements Polyatomic ions memorize from Table 2.5 Use ( ) for polyatomics, if more than 1 needed Nonmetal 1st -> molecule Use prefixes!! Mono not used on 1st element 1st element retains its name, other ends -ide

12 Nomenclature H 1st = Acids No oxygen, also ends -ide
hydro ____ ic acid Has oxygen, polyatomic ion (Table 2.5) -ate becomes ____ic acid -ite becomes ____ous acid H+1 used to balance polyatomic (-) charge

13 Common Polyatomic ions

14 Matter classification

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