1 / 28

Chapter 8

Chapter 8. Chemical Reactions and Equations. Chemical reactions…. Process by which one or more substances are changed into one or more different substances described by a chemical equation. 4 Signs of a Chemical Reaction:. 1. Evolution of heat and light 2. Production of a gas

gali
Télécharger la présentation

Chapter 8

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. Chapter 8 Chemical Reactions and Equations

  2. Chemical reactions…. • Process by which one or more substances are changed into one or more different substances • described by a chemical equation

  3. 4 Signs of a Chemical Reaction: 1. Evolution of heat and light 2. Production of a gas 3. Formation of a precipitate (solid produced as a result of a chem rxn in a sol’n) 4. Color change

  4. Chemical equation • Represents the identities and relative amounts of the reactants and products in a chemical reaction • (NH4)2Cr2O7(s) ---> N2(g) + Cr2O3(s) + 4H2O(g) • Characteristics: • represents the known facts • contains correct formulas for the reactants & products • satisfies the law of conservation of mass (same # and kind of atoms on both sides of the equation)

  5. (NH4)2Cr2O7(s)---> N2(g) + Cr2O3(s) + 4H2O(g) • Formula equation: uses symbols/formulas to represent the reactants and products • Reactants • products • coefficient (understood to be “1” if no # appears) • symbols (p.246)

  6. ammonium dichromate --> nitrogen + chromium(III) oxide + water • Word equation: (previous ex.) • only fulfills ONE characteristic of a chem eq (represents the facts) • 1st step in writing a balanced chemical equation

  7. Steps to write a balanced chemical equation: 1. Write the word equation. 2. Convert the word equation into a formula equation. 3. Include symbols, where known. 4. Balance the equation. NEVER CHANGE A SUBSCRIPT IN BALANCING EQUATIONS!

  8. Cu + H2SO4 CuSO4 + SO2 + H2O Cu H S O Cu + H2SO4 CuSO4 + SO2 + H2O

  9. Cu +2H2SO4 CuSO4 + SO2 + 2H2O

  10. Beaker Breaker • Balance the following equation ___Fe + ___H2O  ____Fe3O4 + ____H2

  11. SiF4 + H2O  H2SiF6 + H2SiO3 Si F H O SiF4 + H2O  H2SiF6 + H2SiO3

  12. 3SiF4 + 3H2O  2 H2SiF6 + H2SiO3

  13. Solutions of lead(II) nitrate and sodium hydroxide react to produce a lead(II) hydroxide precipitate and an aqueous solution of sodium nitrate.

  14. Pb(NO3)2(aq) + 2NaOH(aq)  Pb(OH)2(cr) + 2 NaNO3(aq)

  15. Solid rubidium oxide reacts with water to produce an aqueous solution of rubidium hydroxide.

  16. Rb2O(s) + H2O(l) 2RbOH(aq)

  17. Lithium reacts with a hydrochloric acid solution to produce an aqueous solution of lithium chloride and hydrogen.

  18. 2Li(cr) + 2HCl(aq) 2LiCl(aq) + H2(g)

  19. In the presence of an electrical current, sodium hydroxide can be produced from the reaction of a sodium chloride solution with water. Hydrogen and chlorine gases are the other products.

  20. 2NaCl + 2H2O  2NaOH + H2 + Cl2

  21. Beaker Breaker Balance the following equation: ______Na + _______H2O  _____H2 + ______NaOH

  22. Aluminum sulfate is produced when aluminum hydroxide reacts with sulfuric acid. Water is the other product.

  23. 2Al(OH)3 + 3H2SO4 Al2(SO4)3 + 6H2O

More Related