Ma Chan Duen Hey Memorial College

Ma Chan Duen Hey Memorial College Chemistry Section One : Matters Worksheet 8 : Chemical Formula and Charges of Ionic Compounds Name : ______F.4 _____ ( ) Date : ______I. Empirical formula of ionic compounds - Ionic compounds are made up of ______and ______- Total ______charges and total ______charges must be ______- Ionic compounds are electrically ______(a) Total charges of cations and anions - Example 1 Each Na+ has ______unit of positive charge or Each Ca2+ has ______units of positive charge or Each Cl- has ______unit of negative charge or Each O2- has ______units of negative charge (b) Ratio of cation to anion - Ratio of cation to anion is made up to equal total charges so that the ionic compound is electrically ______- Example 1 Ionic compound made up of Na+ and Cl- has a simple ratio of _____ : _____

Ionic compound made up of Ca2+ and Cl- has a ratio of __1__ : _____

Ionic compound made up of Na+ and O2- has a ratio of _____ : __1__

Ionic compound made up of Al3+ and O2- has a ratio of _____ : _____

Ionic compound made up of X2+ and Y- has a ratio of _____ : _____

(c) Empirical formula of ionic compounds - Empirical formula of ionic compounds shows the ratio between cation and anion - Formula of ______is written first and then that of ______- Example 1 Empirical formula for sodium chloride is ______Empirical formula for calcium chloride is ______Empirical formula for sodium oxide is ______Empirical formula for aluminium oxide is ______Empirical formula for ionic compound made up of X2+ and Y- is ______

P.1 II. Charges of ions in ionic compounds - Ratio of cation to anion is made up to equal total charges - Example 1 Ionic compound of empirical formula XY has ______as the cation with _____

______charge and _____ as the anion with ______charge

Ionic compound of empirical formula X2Y has _____ as the cation with _____ positive charge and _____ as the anion with _____ negative charge

Ionic compound of empirical formula XY2 has _____ as the cation and _____ as the anion

Ionic compound of empirical formula X3Y2 has _____ as the cation and _____ as the anion