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Chapter 3 Scientists

Terms in this set (23)

Who wrote the law of definite proportions?Proust
Proust
Who was Democritus?
A Greek philosopher who named the atom
What did Democritus support?
the particle theory of matter
Why was the atom named "the atom"
It was based off of the Greek word meaning "indivisible"
Who wrote the Law of Conservation of Mass?
Antoine Lavoisier
What is the Conservation of Mass?
mass is neither created or destroyed
What is the Law of Definite proportions?
A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample our source of the compound
Who wrote the Law of Multiple Proportions?
Dalton
What is the Law of Multiple proportions?
If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
proposed an explanation of some of the basic laws of atomic theory
John Dalton
What are the five parts of Dalton's atomic theory?
1.All mater is composed of extremely small particles called atoms
2.Atoms of a given element are identical in size, mass and other properties
3.Atoms cannot be subdivided, created, or destroyed
4.Atoms of different elements combine in simple whole number ratios to form chemical compounds
5.In chemical reactions, atoms are combined, separated, or rearranged
What is different in the modern atomic theory?
Atoms can be subdivided and atoms of the same element can differ in mass.
Who was Joseph Thomsom?
conducted experiments in 1897 to conclude that all cathode rays, subatomic atomic, and electrons.
What did Rutherford call his experiment?
the gold foil experiment
What was the conclusion of the gold foil experiment?
Atoms are made up of mostly empty space with a mall dense positively charged nucleus
Proposed that light is made up of units and energy of a definite amount ,each which is called
Plank, Quantam of Energy
Proposed a model of the atom in which the electrons orbit the nucleus without losing energy
Bohr
Atoms that have the same number of positively charged particles but different numbers of uncharged particles are
isotopes
The sum of the positively charged particles and the uncharged particles is called
the mass number
The number of positively charged particles in an atom is called
atomic number
What did rutherford call his experiment?
the gold foil experiment
proposed an explanation of some of the basic laws of atomic theory
John Dalton
Smaller atom particles
subatomic particles
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