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Hotdogs contain many chemical additives Sodium nitrite Preservative and colour enhancer Sodium phosphate Binding agent Sodium erythrobate Preservative.

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Presentation on theme: "Hotdogs contain many chemical additives Sodium nitrite Preservative and colour enhancer Sodium phosphate Binding agent Sodium erythrobate Preservative."— Presentation transcript:

1 Hotdogs contain many chemical additives Sodium nitrite Preservative and colour enhancer Sodium phosphate Binding agent Sodium erythrobate Preservative

2 Nitrites are not all bad news... Research suggests that sodium nitrite may help protect heart tissue after a heart attack or heart transplant Nitrites and nitrates occur naturally in soil and are important plant nutrients

3 Polyatomic Ions A polyatomic ion is an ion that consists of a stable group of several atoms acting together as a single charged particle. The ionic charge of a polyatomic ion is shared over the entire ion rather than being on just one atom 3- Phosphate Ion

4 Formulas and Charges of Common Polyatomic Ions Name of Polyatomic Ion Ion FormulaIonic Charge Nitrate ionNO 3 - - 1 Nitrite ionNO 2 - - 1 HydroxideOH - - 1 CarbonateCO 3 2- - 2- 2 SulfateSO 4 2- - 2 PhosphatePO 4 3- - 3 AmmoniumNH 4 + + 1

5 Naming Compounds involving Polyatomic Ions Write the name of the compound Fe(NO 3 ) 3 Step 1: Write the name of the metal and check whether it has more than one possible ionic charge. Iron has two possible charges (+2 and +3) Step 2: Determine the ionic charge of the metal. Fe(NO 3 ) 3 x + 3(-1) = 0 x = + 3 Step 3: Write the name of the compound with the Roman numeral if necessary. The name of Fe(NO 3 ) 3 is iron (III) nitrate.

6 Writing Formulas for Compounds Containing Polyatomic Ions What is the chemical formula of copper (II) nitrate? Step 1: Write the symbol of each ion, with its charge. Cu 2+ (NO 3 ) - Step 2: Crisscross the numbers of the ionic charges so that they become subscripts. Cu 2+ (NO 3 ) - Step 3: Write any necessary subscripts after the brackets around each ion. The formula of copper (II) nitrate is Cu(NO 3 ) 2

7 What is the most common ending for the name of.... A) a polyatomic anion? “ –ate” (nitrate, chlorate, sulfate, phosphate) B) an anion made up of only one element? “ –ide” (nitride, chloride, sulfide, phosphide)


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