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# What Three laws that support Dalton's Atomic Theory?

Updated: 8/11/2023

Wiki User

10y ago

Law of Conservation of Mass - No detectable gain or loss in mass occurs in chemical reactions. However, the state of a substance may change in a chemical reaction. For example, substances involving in a chemical reaction can change from solid states to gaseous states but the total mass will not change. Note that the energy released (exothermic) or adsorbed (endothermic) in a chemical reaction is a result of energy transfer between atoms and their environment.

Law of Definite Proportion - The elements in a given compound are always combined in the same proportion by mass. This law forms the basis for the definition of a chemical compound. For example, a water molecule (H2O) consists of two hydrogen atoms each of relative mass of 1 and one oxygen atom of relative mass of 16 (rounded to nearest integer number). By putting a sensible unit measurement this means that there are 2 g of hydrogen and 16 g of oxygen in a sample of 18 g of water. The ratio is 1 to 8. Thus, a sample of, say, 51.435 g of water always contain (51.435 x 1/9) 5.715 g of hydrogen and (51.435 x 8/9) 45.720 g of oxygen. The ratio, again, is 1 hydrogen to 8 oxygen. This rule applies for water found anywhere in the universe and the mass proportion is always the same for any given unit measurement (kilogram, pound etc.).

Law of Multiple Proportion - Whenever two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers. Take an example of two mineral samples iron pyrite (FeS2) and iron troilite (FeS). Both contain iron and sulfuratoms. However, for a given fixedamount of iron it requires exactly twice the mass of sulfur needed to make pyrite than that of troilite with the same amount of iron.

Wiki User

10y ago

Wiki User

12y ago

There were actually four postulates:

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangementof atoms.

Wiki User

11y ago

law of conservation of mass

law of definite proportion

law of multiple proportion

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Q: What Three laws that support Dalton's Atomic Theory?
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