Conservation of mass law and law of definite proportions
Antoine Lavoisier (1743-1794)
Conservation of mass law
"mass of a closed system (in the sense of a completely isolated system) will remain constant over time"
Antoine Lavoisier , French chemist,Antoine Laurent Lavoisier was born on August 26, 1743, in Paris.
Lavoisier's experiments were among the first truly quantitative chemical experiments ever performed. He showed that, although matter changes its state in a chemical reaction, the quantity of matter is the same at the end as at the beginning of every chemical reaction. These experiments provided evidence for the law of the conservation of matter. Lavoisier also investigated the composition of water, and he named the components of water oxygen and hydrogen.
Joseph Proust (1754-1826)
law of definite proportions
"chemical compound consists of elements by comparison mass which is always exactly the same"
French chemist. Joseph Louis Proust was born in Angers and educated in Paris. He is best known for establishing the chemical law of definite proportions, sometimes called Proust's law, which states that the elements in a compound are all present in a fixed proportion by weight, regardless of how the compound is prepared.
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. With this he showed that each had the same proportion of weights between the three elements involved (Cu, C, O). Between the two types of the other compounds, Proust showed that no intermediate indeterminate compounds exist between them
Joseph Proust (1754-1826)
law of definite proportions
"chemical compound consists of elements by comparison mass which is always exactly the same"
French chemist. Joseph Louis Proust was born in Angers and educated in Paris. He is best known for establishing the chemical law of definite proportions, sometimes called Proust's law, which states that the elements in a compound are all present in a fixed proportion by weight, regardless of how the compound is prepared.
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. With this he showed that each had the same proportion of weights between the three elements involved (Cu, C, O). Between the two types of the other compounds, Proust showed that no intermediate indeterminate compounds exist between them
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