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The Dance of the Elements: Simple Chemical Reactions

The Dance of the Elements: Simple Chemical Reactions. 5 types of reactions. Synthesis (S) Decomposition (D) Single replacement (SR) Double replacement (DR) Combustion (C). Visualizing chemical reactions is much like imagining the elements involved in a simple dance.

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The Dance of the Elements: Simple Chemical Reactions

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  1. The Dance of the Elements:Simple Chemical Reactions

  2. 5 types of reactions • Synthesis (S) • Decomposition (D) • Single replacement (SR) • Double replacement (DR) • Combustion (C)

  3. Visualizing chemical reactions is much like imagining the elements involved in a simple dance. At a dance, people can pick a partner, separate and take a break, change a dance partner or change both dance partners.

  4. At the beginning of a dance, partners join together. When elements combine to form a new compound, this is called a SYNTHESIS REACTION.

  5. Reaction Synthesis Reactions Elements combine to form a new compound that has different properties than the elements alone. Synthesis means “to make” and what happens in this reaction is that smaller parts create a new more complex compound.

  6. Recognizing a Synthesis Reaction All synthesis reactions follow the pattern A + B AB Looking at a real reaction, like one below, two or more different elements/compounds combine to form one new compound 2Na (s) + Cl2 (g)  2NaCl (s)

  7. There comes a time for partners to stop dancing and take a break. When chemical compounds divide and break down into smaller components, this is called a DECOMPOSITION REACTION.

  8. Reaction Decomposition Reactions Decomposition occurs when a compound breaks down from a complex molecule into simpler substances. Decomposition means “to break down” or “decay.”

  9. Recognizing a Decomposition Reaction All decomposition reactions follow the pattern AB A+B In an actual reaction, one larger compound breaks down into two or more smaller substances. HgCl2 (s)  Hg (l) + Cl2 (g)

  10. Dancers sometimes change partners When chemical compounds change one partner for another, this is called a SINGLE DISPLACEMENT REACTION.

  11. Reaction Single Displacement Reactions In this reaction, a more reactive ion replaces a less reactive ion and a new compound is produced.

  12. Recognizing a Single Displacement Reaction This reaction follows the pattern AB +C AC+ B An actual single displacement reaction would free one ion and take up another ion Mg (s) + 2 H2O (l)  Mg(OH)2 (l) + H2 (g)

  13. Dancers can also change both partners When two chemical compounds both exchange a partner, it is called a DOUBLE DISPLACEMENT REACTION.

  14. Reaction Double Displacement Reactions In this reaction, the more reactive ions pair to form a new compound and the less reactive pair also form a new compound.

  15. Recognizing a Double Displacement Reaction This reaction follows the pattern AB +CD AD+CB A double displacement reaction would free ions to change partners AgNO3 (aq) + KCl (aq)  AgCl (s) + KNO3 (aq)

  16. It’s that simple! Chemistry isn’t always difficult.By learning to recognize the four simplest types of chemical reactions, you have taken a big step towards learning how different chemicals interact with one another.

  17. HOMEWORK • READ lab CAREFULLY!!!! • HANDOUT: front : tell type for 1—6 , 8—14 • Back : tell type for 1—15 • Finish ch. 8 reading guide AND webquest for a late grade!! • BE READY FOR QUIZ ON TYPES OF REACTIONS NEXT CLASS PERIOD!!

  18. http://www.youtube.com/watch?v=JQVl1-RDFWI (you tube: types of chemical reactions intro.wmv)

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