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Chem Exam

QuestionAnswer
Law of conservation of mass During the course of the chemical reaction, mass remains constant. In a chemical reaction, mass is neither created nor destroyed.
Law of definite proportions All samples of a given compound, regardless of their source or how they're prepared, have the same proportions of their constituent elements.
Law of multiple proportions If elements combine to form more than one compound, the ratio or masses between the 2 elements will be small whole numbers.
Law of constant composition A compound must always be made of the same elements in the same amount.
Who law of conservation of mass Antoine Lavoisier
Who law definite proportions Joseph Louis Proust
Who law of multiple proportions John Dalton
Who law of constant composition Joseph Louis Proust
Postulate 1 Each element is composed of extremely small particles called atoms.
Postulate 2 All atoms of the same element are identical in mass and properties.
Postulate 3 Atoms of an element are not changed into atoms of a different element by chemical reactions; atoms are neither created nor destroyed in chemical reactions.
Postulate 4 Atoms of different elements combine in fixed, simple whole‑number ratios to form compounds.
Gold foil experiment Ernest Rutherford
Oil drop experiment Robert Millikan
Plum Pudding model JJ Thomson
Who was credited for electrons JJ Thomson
What did Millikan find Charge of electron
What did Rutherford find Most of the volume of the atom is empty space.
Who discovered neutrons James Chadwick
Created by: user-2057611
 

 



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