CHEM 1211K: CHAPTER 2

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15 Cards in this Set

Front	Back
Law of Conservation of Mass	In a chemical reaction, matter is neither created nor destroyed.
Law of Definite Proportions	All samples of a given compound,regardless of their source or how they were prepared, have the same proportions of their consitituent elements.
Law of Multiple Proportions	When two elements (call them A & B) form two different compounds, the masses of elements B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.
Anions	negatively charged ions
Cations	positively charged ions
Metals	found on lower left an middle of Periodic table -good conductors of heat & electricity -malleability -ductility -shiny -tend to lose electrons when they undergo chemical changes
Non Metals	found on upper right side of Periodic table -some are solids at room temp. others liquids/gasses -poor conductors of heat and electricity -tend to gain electrons when they undergo chemical changes
Metalloids (semiconductors)	Show mixed properties; lie across the zig zag line -intermediate and highly temperature dependent electrical conductivity
Main-group Elements	tend to be largely predictable based on their position on the periodic table
Transition elements/metals	tend to be less predictable based simply on their position in the periodic table.
Noble Gases	are most un-reactive
Alkali Metals	re all reactive metals
Alkaline earth metals	Fairly reactive
Halogens	Very reactive non metals
Mole (Avagadros Number)	6.0221421 *10^23 particles