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Naming Molecular Compounds

This worksheet teaches students how to name molecular compounds using prefixes and formulas. It emphasizes the importance of precise chemical naming and explores covalent bonding between nonmetals through examples like CO and CO₂.

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    Naming Molecular Compounds How are the chemical formula and name of a molecular compound related? Why? When you began chemistry class this year, you probably already knew that the chemical formula for carbon dioxide was CO a . Today you will find out why CO a is named that way. Naming chemical compounds correctly is of paramount importance. The slight diflerence between the names carbon monoxide (CO, a poisonous, deadly gas) and carbon dioxide (CO a , a greenhouse gas that we exhale when we breathe out) can be the diflerence between life and deaths In this activity you w T ill learn the naming system for molecular compounds. M o d e l 1 - M o l e c u l a r C o m p o u n d s Mo lecu lar Formul a Number of Atoms of Fire t Element Number of Atoms of Second Element Name of Compound C1F 1 1 Chlorine monofluoride C1F E 1 5 Chlorine pentafluoride CO 1 1 Carbon monoxide co a 1 5 Carbon dioxide CLO 2 1 Dichlorine monoxide PCL 1 5 Phosphorus pentachlroride NaOs 2 5 Dinitrogen pentoxide 1. Fill in the table to indicate the number of atoms of each type in the molecular formula. 2. Examine the molecular formulas given in Model 1 for various molecular compounds. a. Haw many different elements are present in each compound shown? two b. Do the compounds combine metals with metals, metals with nonmetals, or nonmetals with nonmetals? Non-metals with non-metals c. Based on your answer to b, what type of bonding must be involved in molecular compounds? Covalent bonds 3. Find all of the compounds in Model 1 that have chlorine and fluorine in them. Explain why the name "chlorine fluoride 1 ' is not sufficient to identify a specific compound. M lew rr m!*::±ji12Xa:r*£« Naming Molecular Compounds riHi LT’writ >il e o i ctwge o n Qstudocu Downloaded by Anthony Ngatia {tDnyrgatziggmai.Kjni)

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    4. Assuming that the name of the compound gives a clue to its molecular formula, predict how many atoms each of these prefixes indicates, and provide two examples. Mono- one di- two penta- five M o d e l 2 - Preffixes a n d Suffixes Prefii x Numerical Value Molecular Formula Name o f Compound mono- 1 BCle Boron trichloride di- 2 SFe Sulfur hexafluoride tri- 3 IF? Iodine heptafluoride tetra- 4 N L Nitrogen triiodide penta- 5 NsOt Dinitrogen tetroxide hexa- 6 C L X O Dichlorine monoxide hepta- 7 PiOio Tetraphosphorus decoxide octa- 8 BaHs Penta boron nonahydride nona- g Bia Cfe Tribroniine octoxide deca- 1 0 C1F Chlorine mo no fluoride 5. Examine die prefi xes in Model 2. Fill in the numerical v a ue diat corresponds to each prefix. 6. What suffl x (ending) d o all the compound names in Model 2 have in common? -ide 7. Carefully examine the names of the compounds in Model 2. When is a prefix N O T used in front of die name of a n element? A prefix is not used when there is only ONE atom of the first element 8. Consider the compound NO. a. Which element, nitrogen or oxygen, would require a prefix in the molecule name? Explain your answer. Oxygen It is the second element in the compound. The elements are covalendy bonded so a prefix is needed to shew how many atoms of the element are in the molecule POGIL’ Activities for High School Chemistry 7 2 nrtwjnlnarlpd h v Anfhnnw N n a t w ftnnwn nalrtfllnmail m m l

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