logging in or signing up Dressen-Describing Chemical Reactions darrend23 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 183 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: February 04, 2011 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Chapter 8 : Chapter 8 Chemical Equations and ReactionsSection 8.1 Describing Chemical Reactions: Section 8.1 Describing Chemical Reactions Objective 1: You will learn to identify when a chemical reaction takes place. Objective 2: You will know what the “Law of Conservation of Mass” means. Objective 3: You will be able to write both word and formula equations. Objective 4: You will know what all the different symbols used in writing chemical equations mean.How Do You Know A Rxn Has Occurred???: How Do You Know A Rxn Has Occurred??? Heat and/or light is produced light and heat rxn Production of gas Formation of a precipitate Color change precipitate and color changeLaw of Conservation of Mass: Law of Conservation of Mass Atoms are neither created or destroyed Antoine Lavoisier (1743-1794)Communicating a chemical reaction: Communicating a chemical reaction In a sentence every item is a word … Copper reacts with chlorine to form copper (II) chloride. In a word equation some symbols used … copper + chlorine ® copper (II) chloride In a formula all symbols used … Cu(s) + Cl 2 (g) ® CuCl 2 (s)All chemical reactions…: All chemical reactions… have two parts: Reactants = the substances you start with Products = the substances you end up with The reactants will turn into the products. Reactants ® ProductsSymbols in equations? – Text page 246: Symbols in equations? – Text page 246 the arrow separates the reactants from the products (arrow points to products) Read as: “reacts to form” or yields The plus sign means “and” (s) after the formula = solid: Fe (s) (g) after the formula = gas: CO 2(g) (l) after the formula = liquid: H 2 O (l)Symbols used in equations: Symbols used in equations (aq) after the formula = dissolved in water, an aqueous solution: NaCl (aq) is a salt water solution used after a product indicates a gas has been produced : H 2 ¯ used after a product indicates a solid has been produced : PbI 2 ¯Symbols used in equations: Symbols used in equations double arrow indicates a reversible reaction (more later) shows that heat is supplied to the reaction is used to indicate a catalyst is supplied (in this case, platinum is the catalyst)What is a catalyst?: What is a catalyst? A substance that speeds up a reaction, without being changed or used up by the reaction. Enzymes are biological or protein catalysts in your body.Write a skeleton equation for:: Write a skeleton equation for: Solid iron (III) sulfide reacts with gaseous hydrogen chloride to form iron (III) chloride and hydrogen sulfide gas. Nitric acid dissolved in water reacts with solid sodium carbonate to form liquid water and carbon dioxide gas and sodium nitrate dissolved in water.Now, read these equations:: Now, read these equations: Fe (s) + O 2(g) ® Fe 2 O 3(s) Cu (s) + AgNO 3(aq) ® Ag (s) + Cu(NO 3 ) 2(aq) NO 2(g) N 2(g) + O 2(g) You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.