Transcript IONIC BONDING - Norman Public Schools
COVALENT BONDING
When an atom of one
nonmetal shares
one or more electrons with an atom of another
nonmetal
so both atoms end up with eight valence electrons
COVALENT BONDING
IS THE COMPOUND A COVALENT COMPOUND?
NONMETAL NONMETAL YES since it is made of only nonmetal elements
COVALENT BONDING
NAMING COVALENT COMPOUNDS USE THE PREFIX METHOD
COVALENT BONDING
1 = MONO 6 = HEXA 2 = DI 7 = HEPTA 3 = TRI 8 = OCTA 4 = TETRA 9 = NONA 5 = PENTA 10 = DECA
COVALENT BONDING 1.
2.
3.
4.
Name the first element in the compound Write the prefix on the name that matches the subscript number in the formula for the compound Repeat these steps until you have done all of the elements in the compound Change the ending of the name of the last element to end in “-ide”
COVALENT BONDING
NAMING COVALENT COMPOUNDS C = carbon 4 = tetra So C 4 = tetra carbon
COVALENT BONDING
NAMING COVALENT COMPOUNDS S = sulfur 7 = hepta So S 7 = hepta sulfur
COVALENT BONDING
NAMING COVALENT COMPOUNDS Br = bromine 3 = tri So Br = tri bromine
COVALENT BONDING
NAMING COVALENT COMPOUNDS O = oxygen 1 = mono So O = mono xygen
COVALENT BONDING
NAMING COVALENT COMPOUNDS P = phosphorus 9 = nona So P 9 = nona phosphorus
COVALENT BONDING Put all of the parts together to get the final name of the compound
Tetra carbon hepta sulfur tri bromine mono xygen nona phosphorus
This is almost right. The ending on the last element in the name needs to be changed to “-ide” so the final correct name would be
Tetra carbon hepta sulfur tri bromine mono xygen nona phosph ide
COVALENT BONDING
1.
WRITING FORMULAS FOR COVALENT COMPOUNDS Write the symbol for the first element in the compound 2.
3.
To write the subscript, use the number that matches the prefix for the first element Continue until you have used all of the elements in the compound
COVALENT BONDING
tricarbon pentanitrogen octoflourine dioxide tri carbon = C 3 penta nitrogen = N 5 octo flourine = F 8 di oxide = O 2
COVALENT BONDING
Put the pieces together and the formula for Tricarbon pentanitrogen octoflourine dioxide becomes
EXCEPTIONS When a chemical formula starts with hydrogen, the hydrogen atom is acting like an ion and the compound is IONIC, not covalent.
ACIDS have special names based on their formulas
ACID NAMES HCl is hydrochloric acid HNO 3 is nitric acid H 2 SO 4 is sulfuric acid H 3 PO 4 is phosphoric acid
REVIEW QUESTIONS 1.
What part of the atom is involved in covalent bonding?
2.
Covalent compounds are made of elements that are both ___________.
3.
If you see prefixes in the name of a compound, it means it’s bonding is ___________
REVIEW QUESTIONS 4.
What is the chemical name for C 7 H 3 Br 6 ?
5.
What is the chemical name for H 2 O?
6.
What is the chemical formula for monosulfur dioxide?
7.
What is the chemical formula for trinitrogen hexaflourine disulfur monophosphide?