second week of notes
second week of notes CHEM 211-002
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This 3 page Class Notes was uploaded by Briana Marcy on Sunday September 20, 2015. The Class Notes belongs to CHEM 211-002 at George Mason University taught by Paul Cooper in Summer 2015. Since its upload, it has received 36 views. For similar materials see General Chemistry 1 in Chemistry at George Mason University.
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Date Created: 09/20/15
Briana Marcy CHEM 211 Dr Cooper Chem 2nOI week notes ch2 cont d and Ch 3 Chapter 2 When naming binary ionic compounds the metal comes first Atomic Symbol Number and Mass X atomic number of the element A mass number AZN Z atomic number protons N neutrons in the nucleus ISOTOPES are atoms of the same element w the same number of everything EXCEPT nuetrons which in turn ups the mass number Know where metals metalloids and nonmetals are on the periodic table You should also be familiar with the position of noble gases and oftenused elements Molecules consist of two or more atoms bonded by the sharing of electrons most covalent substances consist of molecules Ions are a single atom or covalently bonded group of atoms that have an overall electrical charge the are N0 molecules in an ionic compound ELEMENTS THAT OCCUR AS MOLECULES Diatomic H2 N2 02 F2 CIZ BrZ i2 Tetratomic P4 Octatomic S8 Se8 A polyatomic ion consists of two or more atoms that are covalently bonded together and have an overall charge In many reactions the polyatomic ion will remain together as a unit Naming Binary Ionic Compounds For all ionic compounds the name and formula lists the cation 1 then the anion In a binary ionic compound both the cation and anion are monatomic The name of the cation is the same as the name of the metal HINT many metal names end in ium The anion is named by adding the suffix ide to the root of the nonmetal name Ex Calcium and bromine makes calcium bromide MUST MEMORIZE FIGURE 217 on ch2 PP Know prefixes for hydrates and binary covalent compounds Mono di etc Naming acids see PP slide 50 Naming Binary Covalent Compounds slide 52 Naming straightchain alkanes Hydrocarbons are compounds that contain only carbon and hydrogen atoms Alkanes are the simplest type of hydrocarbon usually named using a root name followed by the suffix ane See slide 56 for molecular masses from chemical formulas Know the used for representing molecules Mixtures Heterogenous mixture one or more visible boundaries between the compounds Homogenous mixture no visible boundaries bc the components are mixed as ind Atoms ions and molecules ANOTHER NAME for a homogenous mixture is a SOLUTION Solutions in water are called AQUEOUS SOLUTIONS Chapter 3 A mole mol is the amt of a substance that contains the same number of entities as there are atoms in exactly 12g of carbon 12 Entities atoms ions molecules formula units or electrons any type of particle One mole contains 6022x10quot23 entities to 4 sig figs This number is called Avogadro s number and is abbrev N EXAMPLES 1 atom of Fe has the mass 5585amu 1 mol of Fe has mass 5585g And 1 molecule of H20 has mass 1802 amu 1 mol of H20 has mass 1802g Molar Mass is the mass per mole of its entities For monatomic elements the molar mass is the same as the atomic mass in gramsmole the atomic mass is found on the Per Table Ex Molar mass of Ne2018 gmol Mass Percent from the chemical formula See slide 310 Many of the formula problems will need to just be practiced practice practiced See PP slides for some the book for others and YouTube is helpful for some concepts as well
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