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–Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

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Presentation on theme: "–Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken."— Presentation transcript:

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3 –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken

4 –Chemical reactions involve changes in matter, the making of new materials with new properties, and energy changes.

5 –Symbols represent elements, formulas describe compounds, chemical equations describe a chemical reaction

6 Items to the LEFT of the arrow in a chemical equation are called REACTANTS. Na + Cl NaCl

7 Items to the right of the arrow are called PRODUCTS. Ex: Na + Cl NaCl

8 Important NOTE: No matter how many reactants and products are involved, all atoms present at the start of a reaction are present at the end.

9 THE TOTAL MASS OF THE REACTANTS MUST EQUAL THE TOTAL MASS OF PRODUCTS. MATTER IS NEVER CREATED OR DESTROYED.

10 Reactions that release heat.

11 Reactions that absorb heat.

12 A substance that speeds up chemical reactions.

13 A substance that slows down a chemical reaction.

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15 Synthesis reaction- 2 or more simple substances combine to form a new, more complex substance

16 Na + Cl NaCl Na 2 O + CO 2 Na 2 CO 3

17 Decomposition reaction- A complex substance breaks down into two or more simpler substances Starts with one reactant and ends with 2 or more products.

18 H 2 CO 2 H 2 O +CO NaCl Na + Cl 2

19 Single-replacement reaction – An uncombined element replaces an element that is part of a compound.

20 One compound and a free element that recombine to yield a new compound and new free element.

21 2Na +2H O 2NaOH + H Fe + CuSO 4 Cu + FeSO 4

22 Double-replacement reaction- different atoms in 2 different compounds replace each other. 2 compounds react to form 2 new compounds.

23 Starts with 2 compounds as reactants. These recombine to form 2 new compounds as products. + +

24 MgCO + H 2 Cl MgCl + H 2 CO KOH + HNO 3 HOH + KNO 3 C:\Documents and Settings\mswilliams\Local Settings\Temporary Internet Files\OLK1B5\types.htm

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26 C + O 2 -----  CO 2 1. Synthesis Reaction

27 NaCl ----  Na + Cl 2 2. Decomposition Reaction

28 3. FeCl 2 + K 2 S --  FeS + KCl Double Replacement

29 4. Fe + H 2 O  Fe 3 O 4 + H 2 Single Replacement

30 5. AlCl 3  Al + Cl 2 Decomposition Reaction

31 6. Na + H 2 SO 4 ---> Na 2 SO 4 + H 2 Single Replacement

32 7. AlCl 3 + Na 2 CO 3  Al 2 (CO 3 ) 3 + NaCl Double Replacement

33 8. CS 2 + O 2  CO 2 + SO 2 Single Replacement

34 9. Cr + O 2  CrO 3 Synthesis Reaction


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