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How to Name Covalent compounds?

How to Name Covalent compounds?. First of all…What are covalent compounds??. Covalent compounds are a compounds that form between 2 non-metal atoms Polyatomic ions are bonded in this way too, and include at least one non-metal ion (anion) Covalent bonding – elements share e -. - charge.

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How to Name Covalent compounds?

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  1. How to Name Covalent compounds?

  2. First of all…What are covalent compounds?? • Covalent compounds are a compounds that form between 2 non-metal atoms • Polyatomic ions are bonded in this way too, and include at least one non-metal ion (anion) • Covalent bonding – elements share e- - charge - charge

  3. Let’s Recap first… • Cu2S - What does this tell us about the compound? • Tells us it’s Ionic ( metal and non-metal) • There is a 2:1 proportion of atoms • 2 Copper to every 1 Sulfur • Copper is a multivalent element • The name is?? • Copper (I) Sulphide

  4. So how do we Name them? • In formulae of covalent compounds the subscript ( the small #’s at the bottom, behind each element) tells us the actual # of atomsof each element in that molecule • In naming covalent compounds we use prefixes to tell us how many atoms are in the molecule • The prefix goes in front of the element that you are talking about

  5. So Let’s look at an Example now… • In CO2 - how many atoms of Carbon? How many of Oxygen? • 1 atom of Carbon, and 2 atoms of Oxygen • If we had to assign a prefix to each element, what would it be for Carbon? For Oxygen? • Mono-Carbon, Di-Oxygen • Carbon dioxide

  6. Steps for Naming Covalent Compounds: • Step 1: Name the left-most element in the formula first (just like ionic compound naming) • Ex. CO – name Carbon first • Step 2: Name the 2nd element and add the -ide (just like we have done with ionic compounds). • Ex. Carbon Oxide • Step 3: Add to each element the proper prefix to indicate the # of atoms present. • Ex. Monocarbonmonooxide

  7. Step 4: Remember the exceptions to Rule 3… They are: • #1 - If the 1st element has only 1 atom, DO NOT add the prefix mono. • #2 – The prefix “Mono” is shortened to “Mon” if placed in front of oxide. • So back to CO, what is the correct name? • Carbon Monoxide Fast Fact: Carbon Monoxide is an odorless, tasteless gas that will kill you in hours or as fast as 3 minutes if the concentration is high enough.

  8. Try to correctly Name… N2O3 • Name left element first, then the next element with -ideending. • Nitrogen Oxide • Now remember the Prefixes… 2=Di, 3=Tri • DinitrogenTrioxide

  9. Try to name These: • CS2 • CCl4 • P4O10 • Carbon Disulphide • Carbon Tetrachloride • TetraphosphorusDecoxide

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