Angers, France - Where Joseph Proust was born on September 26, 1754
Paris, France - Where he studied chemistry and Pharmacy
University of Salamanca - Taught Chemisty
Madrid - He was the director of the royal laboratories
Jons Jacob Berzelius - Proust and Berthollet engaged in a friendly controversy over this issue, but, in the end, Proust was proved to be right.
Claude Berthollet - At the time, most chemists agreed with Claude Berthollet, who believed the composition of a compound would vary according to the amounts of reactants used to produce it
Copper Carbonate - Proust based his theory on careful analysis of copper carbonate, which he prepared in various ways.
Law of Definite Proportions:
Proust’s largest accomplishment into the realm of science was disproving Berthollet with the law of definite proportions, which is sometimes also known as Proust's Law. Proust studied copper carbonate, the two tin oxides,and the two iron sulfides to prove this law. He did this by making artificial copper carbonate and comparing it to natural copper carbonate.
It states that a chemical compound always contains exactly the same proportion of elements by mass. An equivalent statement is the law of constant composition, which states that all samples of a given chemical compound have the same elemental composition.
Atoms:
are made up of 3 types of particles electrons , protons and neutrons . These particles have different properties. Electrons are tiny, very light particles that have a negative electrical charge (-). Protons are much larger and heavier than electrons and have the opposite charge, protons have a positive charge. Neutrons are large and heavy like protons, however neutrons have no electrical charge. Each atom is made up of a combination of these particles.
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