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Chemical Equations + Types of reactions

Chemical Equations + Types of reactions. Chemical Equations. When we look at a chemical equations there are two main parts. H 2 + O 2  H 2 O The reactants , which are located to the left of the arrow. These are the chemicals that are reacting.

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Chemical Equations + Types of reactions

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  1. Chemical Equations + Types of reactions

  2. Chemical Equations • When we look at a chemical equations there are two main parts. H2 + O2  H2O • The reactants, which are located to the left of the arrow. These are the chemicals that are reacting. • The products, which are located to the right of the arrow. These are the new chemicals made after the reaction.

  3. Chemical Equations • Can be written in two ways: • 1.Chemical equation: only has the formulas for elements + compounds involved e.g. H2 + O2  H2O • 2. Word equation: only has the names for elements + compounds involved e.g. Hydrogen Gas + Oxygen Gas Dihydrogen Monoxide

  4. Types of Chemical Reactions • There are four types of reactions. • They are synthesis, decomposition, single and double displacement. • Each one has a different way that reactants combine or break apart to make new products. • Let’s look at each one in more detail!.

  5. Synthesis or Combination • In this reaction, two or more products come together to form one new product compound. • E.G. • Visually it would look like this: • Notice how the rectangle and square came together. +

  6. Decomposition • One large compound breaks apart into two or more smaller products. • E.G. • Visually it would look like this: • Notice how the rectangle/square combination broke apart. +

  7. Single Displacement • In this reaction a lone element exchanges place with another one in a compound on the reactant side to make a new lone element and compound for products. • E.G. • Visually it would look like this: • Notice how the octagon and rectangle traded places. + +

  8. + + Double Displacement • In this reaction two reactant compounds exchange parts to make two new product compounds. • E.G. • Visually it would look like this: • Notice how the octagon and rectangle traded places.

  9. Let’s Try a Few Examples • Look at these chemical equation and determine the type of reaction that has occurred: • You must first look at the chemical equation. • Know the products from reactants (separated by the arrow). • Compare the equation to the four types and determine the type of reaction. AB + CD  AD + CB D.D. A + BC  AC + B S.D A + B  AB Synthesis ABC  AB + C Decomp.

  10. Now the “Real Deal” • 1)  NaOH + KNO3 --> NaNO3 + KOH • 2)  2 Fe + 6 NaBr --> 2 FeBr3 + 6 Na • 3)  CaSO4 + Mg(OH)2 --> Ca(OH)2 + MgSO4 • 4)  Pb + O2 --> PbO2 • 5)  Na2CO3 --> Na2O + CO2 • 1)  double displacement 2)  single displacement 3)  double displacement 4)  synthesis 5)  decomposition

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