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Lecture 9

EASC 101 Lecture 9: 9

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Earth and Planetary Sciences
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The Law of Conservation of Mass In a chemical reaction, the total mass of the reactants, is always equal to the total mass of the products. This law ties in well with the atomic theory, which states that atoms are never created or destroyed. In a chemical reaction the atoms and molecules are simply rearranged. This law of conservation of mass however does not apply to nuclear reactions, because there Is some loss of mass: the mass is changed into energy. This was first suggested by Albert Einstein in his famous equation: E =MC2 (E Is Energy, M is Mass, C2 is a large number) A very tiny amount of mass is equal to a very large amount of energy In an open system some of the mass seems to disappear, when it is in the form of a gas. Other scientists followed up on the law of conservation of mass by stating the ... Law of Definite Composition Compounds are pure substances that contain two or more elements combined together in fixed (or definite) proportions. Water is an example of this law. Pure water always contains 11% Hydrogen and 89% Oxygen. Chemistry Tutorials Law of Multiple Proportions states that the masses of one element, which combine with a fixed mass of the second element, are in a ratio of whole numbers. Pure substances have constant composition and properties. An unknown substance can be identified by measuring a property of the substance (eg. density) and compare it to known values of other substances. If the test property matches a known value, it is likely that substance, because each substance has its own distinguishing properties unique to that substance. Science Focus 9 Matter and Chemical Change Class Notes New Discoveries Allesandro Volta made the first practical battery (the voltaic pile) around 1800, by piling zinc and copper plates on top of each other, separating them with electrolyte-soaked paper discs. When this voltaic pile was hooked up to transfer the electricity through water, they discovered hydrogen and oxygen gases cou
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