OL Counting ATOMS Worksheet

Fill in the blanks with the correct missing word. There is a word bank as you click on each blank. 1. Chemical formulas can have three components. a) The element symbols which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in a compound. b) The subscripts which are numbers that are found on the lower right - hand side of each element symbol. This tells you the number of atoms of this element in the molecule. If an element symbol has no subscript next to it, then this indicated that there is only one atom of this element in the molecule. c) The brackets which surround some groups of atoms indicate that the number of all of the atoms inside the bracket need to be multiplied by the subscript on the outside of the bracket found on the lower right - hand side of that bracket. List the number of atoms for each given element of the molecule NaOH. Element # of Atoms Na 1 O 1 H 1 Total: 3 List the number of atoms for each given element of the molecule H2COCH2. Element # of Atoms H 4 C 2 O 1 Total: 7 List the number of atoms for each given element of the molecule Al(OH)3. Element # of Atoms Al 1 O 3 H 3 Total: 7 List the number of atoms for each given element of the molecule Fe2(CO3)3. Element # of Atoms Fe 2 C 3 O 9 Total: 14