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The elements in a are always combined in the same proportion by mass?
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∙ 7y ago
From many years this affirmation is not considered valid.
Iva Braun
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What law states that a compound always contains the same elements in the same proportion by mass regardless of amount?
law of definate proportions
What guantities are always equal to an elements atomic number?
Mass
Who stated the law of constant composition?
Joseph Louis Proust (1754-1826), In 1799 Proust stated that "Compounds always contain the same elements in a constant proportion by mass." This statement is now called law of definite composition or the law of constant proportion.
Why does each compound have only one composition?
This follows from the law of constant proportions which was discovered by the French chemist Joseph Proust. His law states that a chemical compound always contains the same elements combined together in the same proportion by mass.
Why do elements have a listed average atomic mass and not just atomic mass?
Because most naturally occurring elements are a mixture of isotopes, each having a different atomic mass. These individual isotopic atomic masses must be combined accounting for the amount of each isotope of the element is present to get a weighted average atomic mass.
Are the elements in a mixture always combined in the same proportion by mass?
Of course not, mixtures permit any mix of their components.
What substance that contains 2 or more elements chemically combined in a fixed proportion?
A substance made of two or more elements chemically combined in a specific proportion is called a compound. A substance composed of two or more elements combined chemically in a fixed proportion by mass is called a compound. A chemical compound can be held together by a covalent bond or an ionic bond.
What is the law of proportions?
A chemical compound always contains exactly the same proportion of elements by mass. ---------------------------------------------------------------------------------------------------- A law that states that a compound always contains the same elements in the same proportions. Source: e2020
What is the law of definite proportions?
A chemical compound always contains exactly the same proportion of elements by mass. ---------------------------------------------------------------------------------------------------- A law that states that a compound always contains the same elements in the same proportions. Source: e2020
What law states that a compound always contains the same elements in the same proportion by mass regardless of amount?
law of definate proportions
Who developed the law of definite composition?
In chemistry, the law of definite proportions and also the elements, sometimes called Proust's Law, 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.This observation was first made by the French chemist Joseph Proust based on several experiments conducted between 1798 and 1804. Based on such observations, Proust made statements like this one, in 1806:
Is calcium carbonate a compound or a mixture?
Calcium Carbonate is a compound as it contains 3 different elements (calcium, carbon and oxygen) that are chemically combined.
What happens to mass when chemicals are combined?
The mass of the two chemicals are just combined, and are never changed. They may change forms, like from a solid to a gas, but the mass is always the same.
Explain how your class's results in this experiment support the law of definite composition?
"The Law of Definite Composition states that the elements in a given compound are always combined in the same proportion by mass."All of the students in our class had different values for the mass of the hydrate and anhydrous salt, but all calculated the same formula for the hydrate. By everyone calculating the same formula for the hydrate, the law of definite composition was proved.
A substance breaks down into its component elements when it is heated If 61.8 grams of the substance is present before it is heated what is the combined mass of the component elements after heating?
68.0 grams due to the law of conservation of mass which states that mass can not be lost but only converted.
Why are molar masses not a whole number?
Because chlorine (like almost every other element) exists as several isotopes. The molar mass reflects the combined weight and proportion of each of those isotopes.
What guantities are always equal to an elements atomic number?
Mass
