Chemistry 100 Chapter 4 Notes
Chemistry 100 Chapter 4 Notes CHEM 100 002
Popular in Chemistry and Society
Popular in Chemistry
This 3 page Class Notes was uploaded by Heidi Archer on Thursday February 18, 2016. The Class Notes belongs to CHEM 100 002 at Indiana State University taught by Jeeewandara in Winter 2016. Since its upload, it has received 17 views. For similar materials see Chemistry and Society in Chemistry at Indiana State University.
Reviews for Chemistry 100 Chapter 4 Notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 02/18/16
Chapter 4 Chemistry Notes Molecular Changes Molecules determine the behavior of matter o Human Body o Cooking o Cars In all of science history, and exception to this rule has not been found Chemical Compounds and chemical formulas H2O o 2hydrogen atoms bounded to 1 oxygen atom Chemical formulas Represent a compound with chemical formulas Indicate the elements present in a compound and the relative number of atoms of each If we change the subscripts in a chemical formula, we no longer represent the same compound o H O 2s water . . . H 2 2 hydrogen peroxide Concept Check Determine the number of each type of atom in glucose, which has the molecular formula C H O 6 12 6 o Carbon atoms=6 Hydrogen atoms=12 Oxygen Atoms=6 Determine the number of each type of atom in Ca(NO ) 3 2 o When a group of atoms is placed in parentheses with a subscript outside the parenthesis, that subscript applies to the entire group o CaN O 2 6 Determine the number of each type of atom in Pb(C H 2 3 2 2 o Pb=2 C=4 H=6 O=4 Ionic and Molecular Compounds Elements with unstable electron configurations form compounds with other elements to gain stability Atoms combine each other or bonded together to form compounds Bonding between two atoms involves interaction of electrons This can be accomplished by two ways o Transferring electrons (ionic compounds) o Sharing electrons (molecular compounds) Ionic Compounds Contain a metal and one or more nonmetals Metals and nonmetals are a good chemical match o Metals lose electrons o Nonmetals gain electrons The opposite charges attraction is called an “ionic bond” The result is an ionic bond Subscripts represent the ratio of elements in the crystal lattice of the compound Sodium Chloride Soluble ionic compounds dissociate in water to form electrolyte solutions Such solutions conduct electricity Molecular compounds Covalent bonds o Bonds form between atoms by sharing electrons o Resulting collection of atoms is called a molecule A molecule is always neutral Molecules are the particles that constitute a covalent compound/molecular compound Subscripts represent the actual numbers of each kind of atom in the molecule o Molecular formula : a chemical formula that specifies the actual number of each kind of atom in the molecule, not just the simple ratio Molecules can be very small or very large and very complex, such as in protein molecules Concept Check 4.2 Solution Compounds formed between a metal and at least one nonmetal are ionic. Compounds formed between nonmetals are molecular. a) NaBr: ionic Na (metal) and Br (nonmetal) a) SO : molecular 2 S and O (nonmetals) a) MgF 2 Mg (metal) and F (nonmetal) a) CH 4 C and H (nonmetals) Naming Compounds Ionic o Name begins with the cation (metal) o Followed by the base name of the anion (nonmetal) + ide o Names for ionic compounds do not contain prefixes to indicate the number of atoms Naming Compounds: Anions and Polyatomic Ions Polyatomic ions are ions that are composed of two or more atoms covalently bonded that behave as a single ionic unit Concept Check Mg(OH) 2 o Na2SO 4 o Li2CO 3 o Ca3(PO 4 2 o Naming Molecular Compounds The more metallic and element is listed first and is followed by the less metallic element Prefixes are used to show the number of atoms of the element that are present The mono prefix is not used on the first element Formula Mass Formula mass of a compound is analogous to the atomic mass of an element It is computed by summing the atomic masses of all the atoms in its formula Molar Mass The mass in grams of 1 mole of a compound The formula mass of a compound in amu is numerically equivalent to its molar mass in grams per mol (g/mol)
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'