How to write chemical formula=seminar form 4[1]
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This document provides instructions for writing chemical formulas of ionic compounds in two steps. The first step is to complete a table with common positive and negative ions and their charges. The second step is to use the ions from the table to write formulas by balancing the charges between the metal and nonmetal ions. An example of writing the formula for aluminum carbonate is given to illustrate the process of identifying the ions, balancing their charges, and writing the complete chemical formula.
How to write chemical formula=seminar form 4[1]
- 1. MRSM PC 1 2011 = form 4 How to write CHEMICAL FORMULA Name …………………………………………………class…………………..teacher…… 1) FORMULA OF ION POSITIVE ION (ANION) AND NEGATIVE ION ( CATION) Complete table below Negative Formula in Positive ion Formula in ion compound charge compound Charge Oxide Sodium Hydroxide Potassium Nitrate NO3 -1 -1 Magnesium Mg 2+ +2 Sulphate Zinc Carbonate Copper(II) Cu 2+ +2 Chloride Calsium Bromide Silver Iodide Ammonium Chromate Aluminium Stanum(II) Dichromat e 2) Write the chemical formula of compound Example: Chemical formula of Aluminium Carbonate - State Aluminium ion and Carbonate ion −2 Al 3+ CO3 balance the charge so need 2 aluminium ion and 3 carbonate ion −2 2 Al 3+ 3 CO3
- 2. 2 so the chemical formula is Al2( CO3)3 Complete the table below Metal ion Oxide Hydroxide chloride Sodium Potassium Calcium Ca(OH)2 Zinc Aluminium Metal ion Oxide Hydroxide chloride Ferum(II) Ferum(iii) Copper(II) Silver Ammonium
- 3. 3 Metal ion Bromide Iodide sulphate Carbonate Sodium Potassium Calcium Zinc Aluminium Metal ion Bromide Iodide sulphate Carbonate Ferum(II) Ferum(III) Copper(II) Silver Ammonium