Unit 6 Covalent Bonding covalent bond formed by
Unit 6: Covalent Bonding covalent bond: formed by sharing e–’s between atoms. (nonmetals only) molecular compound: neutral group of atoms joined by covalent bonds.
diatomic molecule: two atoms of the same element.
molecular formula: shows number of atoms of each element
Properties of molecular compounds: Ø lower m. p. ’s than ionic compounds. (usually liquid or gas at room Temp. ) Ø poor conductors
Formulas and Models
Formulas and Models
Formulas and Models
Formulas and Models
Formulas and Models
Quick Quiz! 1. A molecular compound usually consists of A. two metal atoms and a nonmetal atom. B. two nonmetal atoms and a metal atom. C. two or more metal atoms. D. two or more nonmetal atoms.
Quick Quiz. 2. A molecular formula shows… A. how many atoms of each element a molecule contains. B. a molecule's structure. C. which atoms are bonded together. D. how atoms are arranged in space.
Quick Quiz. 3. Compared to ionic compounds, molecular compounds tend to have relatively A. low melting points. B. high melting points. C. high conductivity. D. low conductivity and high melting points.
Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO 2), but these two invisible gases are very different.
A PREFIX tells how many atoms of each element are present in one molecule. Prefix Number mono- 1 hexa- 6 di- 2 hepta- 7 tri- 3 octa- 8 tetra- 4 nona- 9 penta- 5 deca- 10 carbon monoxide (CO) carbon dioxide (CO 2)
Molecular Naming Rules: N 2 O 1) 2) 3) 4) dinitrogen monoxygen ide Name elements in formula order. Prefixes show the number of each atom. Suffix of last element is –ide. No prefix mono- for first element. CCl 4 carbon tetrachloride SO 3 sulfur trioxide H 2 O dihydrogen monoxide
Quick Quiz! 1. Which of the following compounds is named INCORRECTLY? A. CS 2 carbon disulfide B. BCl 3 boron trichloride C. IF 7 iodine heptafluoride D. PCl 5 phosphorus hexachloride
Quick Quiz. 2. Which of the following molecular compounds is named INCORRECTLY? A. PCl 3 phosphorus trichloride B. C 2 O 5 dicarbon pentoxide C. CF 4 carbon tetrafluoride D. H 3 P hydrogen monophosphide
Quick Quiz. 3. The correct formula for hexaphosphorus trisulfide is A. P 7 S 3 B. S 3 P 6 C. P 6 S 3 D. S 3 P 7
A PREFIX tells how many atoms of each element are present in one molecule. Prefix Number mono 1 di 2 tri 3 tetra 4 penta 5 Prefix hexaheptaoctanonadeca- Number 6 7 8 9 10
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