DOC PREVIEW
UNCW CHM 101 - Balancing Equations and Molecular Weight

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

CHM 101 1st EditionLecture 4 Last Lecture Overview- Molecular and Ionic compounds- Naming Compounds- Stoichiometry Lecture 4 OverviewI. Stoichiometry continued II. Balancing EquationsIII. Chemical ReactionsIV. Formula WeightContinuation of the last lecture- Chemical equations must be balanced so they obey the Law of Conservation of Mattero Matter is not created or destroyedo Atoms are not created or destroyed in chemical reactions- Coefficients give the ratio of substances in chemical reactionso Applied to the whole formula- Subscripts- number of individual atomsN2+ 3H2 2NH3 2 N atoms 2 N atoms6 H atoms 6 H atoms- Equations are balanced when the total number of each type of atom is the same on both sides- Often the states of reactants and products in chemical reactions are indicated o (g) gaso (l) liquido (s) solido (aq) aqueous solution 2Na (s) + 2H2O (l)  2NaOH (aq) +H2 (g)- Always remember to make sure the equation is balanced!3 simple Types of Chemical ReactionsI. Combination Reactions – 2 or more reactants combine to form a single producta. A + B  ABII. Decomposition Reactions – single reactant breaks down to form two or more products a. AB  A + BIII. Combustion Reactions – an organic compound is burned ( C, H, and sometimes O) in O to produce CO2 and H2Oa. CH4 (g) + 2O2 (g)  CO2 (g) + 2H2O (g)i. It’s easier to balance the O atoms last Formula Weight – sum of the atomic weights that make up a formula unit of an ionic compoundExample: MgCl21 Mg = 1 x 24.31 amu = 24.31 amu2 Cl = 2 x 35.45 amu = 70.90 amu 95.21 amuMolecular weight – sum of the atomic weights of all atoms that make up a molecule in a molecular compound (same as formula


View Full Document
Download Balancing Equations and Molecular Weight
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Balancing Equations and Molecular Weight and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Balancing Equations and Molecular Weight 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?