Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
COMPOUNDS A. Matter is made up of (from smallest to largest) 1) atom – smallest part of an element that has that element’s characteristics. 2) element – a pure substance made up of only one type of atom 3) molecule – two or more elements (same or different) bonded together 4) compound – two or more different elements combined B. Compounds are represented with chemical formulas 1) formulas are made up of element symbols and numbers 2) the numbers are subscript. This tells you the number of atoms needed to make this compound. 3) If there is a (large) number in front of the compound, that tells you how many molecules of that compound there is 4) Examples: a) H2O hydrogen = 2 oxygen = 1 b) C6H12O6 carbon = 6 hydrogen = 12 oxygen = 6 c) Na(OH)2 sodium = 1 oxygen = 2 hydrogen = 2 d) Na(NH4)3 sodium = 1 nitrogen = 3 hydrogen = 12 e) 3CO2 carbon = 3 oxygen = 6 f) 3Na(OH)2 sodium = 3 oxygen = 6 hydrogen = 6 * If there is a # in front of the compound, multiply everything by that number ** If there is a parenthesis, multiply only what is in the parenthesis by the subscript # right after the parenthesis