1 / 9

Chemical Reactions

Chemical Reactions. February 21, 2002. Evidence for Chemical Reactions. Color change Precipitation Gas production Changes in temperature Changes in properties. Chemical Equations. A shorter, easier way to showing chemical reactions using symbols instead of words

raanan
Download Presentation

Chemical Reactions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chemical Reactions February 21, 2002

  2. Evidence for Chemical Reactions • Color change • Precipitation • Gas production • Changes in temperature • Changes in properties

  3. Chemical Equations • A shorter, easier way to showing chemical reactions using symbols instead of words • Chemical Formula – shows the ratio of elements in a compound • H2O • NaCl • CO2

  4. Structure of an Equation • Reactants – materials you start with • Products – materials you end with • Reactant + Reactant  Product • H2 + O2  H2O2

  5. Conservation of Mass • The amount of matter in a chemical reaction does not change, so the total mass of the reactants must equal the total mass of the products

  6. Classifying Chemical Reactions • Synthesis • Decomposition • Single Replacement • Double Replacement

  7. Synthesis • Two or more elements combine to form a more complex compound • A + B  AB • Hand + kerchief  handkerchief • Example: C + Cl2 CCl4

  8. Decomposition • Breaks down compounds into simpler substances • AB  A + B • Schoolbook  school + book • Example: Al2O3  Al + O2

  9. Replacement • A reaction in which one element replaces another in a compound, or two elements in different compounds trade places • AB + C  AC + B (Single) • AB + CD  AC + BD (Double) • T.V. screen + door knob  T.V. knob + screen door • HCl + NaOH  H2O + NaCl

More Related