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Details Title: Atoms Key Terms Description: Chapter 3 Key Terms Total Flash Cards: 14 Created: 03/16/2004 17:56:06	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term Law of conservation of mass Definition states that mass is neither destroyed nor created during ordinary chemical reactions or physical changes Term law of multiple proportions Definition If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers Term law of definite proportions Definition The fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound Term atom Definition the smallest particle of an element that retains the chemical properties of that element Term nuclear forces Definition these short-range proton-neutron, proton-proton, and neutron-neutron forces hold the nuclear particles together Term atomic number Definition the number of protons and neutrons in the nucleus of each atom of that element Term isotopes Definition atoms of the same element that have different masses Term mass number Definition the total number of protons and neutrons in the nucleus of an isotope Term nuclide Definition a general term for any isotope of any element Term atomic mass unit Definition or 1 amu, is exactly 1/12 the mass of a carbon-12 atom Term average atomic mass Definition the weighted average of the atomic mases of the naturally occuring isotopes of an element Term mole Definition the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12 Term Avogadro's number Definition 6.0221236 x 10^23--is the number of particles in exactly one mole of a pure substance Term molar mass Definition the mass of one mole of a pure substance