Single and Polyatomic Ionic Compounds Introduction

Chemistry Ion Chips Worksheet #1

Single and Polyatomic Ionic compounds – Introduction

Molecules behave as units in physical and chemical processes, and these atomic compositions are expressed as formulas. In a formula, chemical symbols are used to indicate the type of elements present, and subscripts are used to indicate the ratio of these elements. The subscript applies only to the element it follows – H2O = two hydrogen, one oxygen.

In ionic compounds, the charges must be balanced to result in a net charge of zero. If a polyatomic ion is involved (SO42-, PO43-, OH- etc), it must be put in parentheses if more than one is involved to balance the formula – Ca(OH)2. Remember – due to canceling out charges, you do not need or use prefixes in the name of ionic compounds!

For this exercise, fit your chips together to create electronically balanced compounds. Write the correct formula in the space provided – pay attention to subscripts and parentheses! Polyatomic, or “complex” ions can be found in the central chart on your periodic table of ions. (Notice the little mini-box of info…check it out! J)

General Rule of Thumb: “ide” means single ion; “ate” or “ite” means complex. Exception – hydroxide and cyanide are complex.

·  Be aware of the “choice of charge” metals – the ones that are split or have no apparent charge at all. The charge is written in Roman numerals – or the “Classical” system is used – “ic” means the larger charge; “ous” is the smaller charge.

© TWebb