Laws of Chemical changes Flashcards
for review purposes (15 cards)
Basic laws of matter that led to the
formulation of
Dalton’s Atomic
Theory
What are the three laws that were inferred from several experiments
conducted during the 18th century using a balance
for the measurements:
Law of Conservation of Mass
Law of Definite Proportion
Law of Multiple Proportion
Who proposed the law of conservation of mass?
a great French chemist and statesman Anton
Lavoisier in 1789
This law states that, despite chemical reactions or physical
transformations, mass is conserved — that is, it cannot be
created or destroyed — within an isolated system. In other
words, in a chemical reaction, the mass of the products will
always be equal to the mass of the reactants.
Law of Conservation of mass
Who formulated the law of definite proportion
Joseph Proust (1754-1826), a French Chemist
The mass fraction is obtained by dividing the mass of each
element by the total mass of the compound.
law of definite proportion
This law states that if two elements (A and B) combine to
form more than one compound, the different masses of one
element (B) that will combine with a fixed mass of the other
element (A) are in a ratio of small whole numbers such as
1:2, 2:3, 3:4 and so on.
law of multiple proportion
Who proposed the Dalton’s atomic theory
John Dalton
