1 / 10

Topic: Stoichiometry: Balancing Chemical Equations

Topic: Stoichiometry: Balancing Chemical Equations. What is stoichiometry?. The study of quantitative relationships in a balanced chemical equation Balance equations represent chemical reactions Remember in chemical reactions 3 things are conserved Matter Energy charge.

lexiss
Download Presentation

Topic: Stoichiometry: Balancing Chemical Equations

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. Topic: Stoichiometry: Balancing Chemical Equations

  2. What is stoichiometry? • The study of quantitative relationships in a balanced chemical equation • Balance equations represent chemical reactions • Remember in chemical reactions 3 things are conserved • Matter • Energy • charge

  3. Law of Conservation of Matter • Matter is neither created nor destroyed in a chemical reaction • Mass reactants = Mass products • Chemical bonds in reactants may break • New bonds may form to produce products • Number of atoms of each element is “constant” • # of atoms of each element is the same on both sides of the equation

  4. Writing Chemical Equations • Begin with word equation • Solid Tin (IV) Oxide is heated with Hydrogen gas to form tin metal and water vapor. • Next go to skeleton equation: replace names of substances with chemical formulas • SnO2(s) +H2(g) Sn(s) + H2O(g) • Balance skeleton equation: # of atoms of each element is the same on both sides of the equation (law of conversation of mass) - let’s figure out how to balance

  5. Equation Balancing…let’s RAPR A PSnO2(s) +H2(g) Sn(s) + H2O(g) Sn O H 1 - - 1 2 - - 1 2 - - 2 NOT BALANCED

  6. SnO2(s) + H2(g) Sn(s) + H2O(g) 2 2 Sn O H 1 - - 1 2 - - 1 2 4 2 - - 2 4 • Find the most complex compound and then compare the number of each element on product side and reactant side • Look at H2O – 2 Hydrogen and 1 oxygen • On reactant side, 2 Oxygen and 2 Hydrogen • Use Coefficients to balance the numbers of each atom, check number of atoms as you go: NOTE: NEVER CHANGE SUBSCRIPTS BALANCED 

  7. NOTE: Coefficients must be in lowest possible ratios 2SnO2(s) + 4H2(g) 2Sn(s) + 4H2O(g)

  8. Fe + O2 Fe2O3 • HINTS: • Most Complex = Fe2O3 • ODDS ARE AKWARD, so Try to make O3 even!!!!!!! 4Fe + 3O2  2 Fe2O3

  9. AgNO3 + MgCl2 Mg(NO3)2 + AgCl • HINTS: • Keep polyatomics together • NO3 • Ag • Cl • Mg 2 AgNO3 + MgCl2 Mg(NO3)2 + 2 AgCl

  10. Na + H2O  NaOH + H2 2 Na + 2 H2O  2 NaOH + H2 • HINTS: • ODDS ARE AKWARD – try to make even • H on product side H + H2 = 3 hydrogens

More Related