3 chemical reactions
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3 chemical reactions

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    3 chemical reactions 3 chemical reactions Presentation Transcript

    • Chemical Reactions
      • Chemical Reaction- a well- defined example of a chemical change. One or more substances are changed into new substances.
      • What makes up a chemical reaction?
      • Reactants - substances you start with
      • 2. Products - substances you end with
      • Reactants -> Products
      • Balanced chemical equation- same number of atoms of each element on both sides of the equation.
        • Remember atoms are rearranged but never lost or destroyed.
      • Writing a balanced chemical equation
      • Reactant on left side and products on the right side.
      • Check for atom balance
      • Choose coefficients that balance the equation.
      • Coefficients - numbers that represent the number of units of each substance taking part in a reaction.
      • Ex:
      • Reactants Products
      • _LiF + _Br 2 -> _LiBr +_ F 2
      • 1 1 2 1 1 2
      • Reactants Products
      • 2 LiF + _Br 2 -> _LiBr +_ F 2
      • 2 2 2 1 1 2
      • Reactants Products
      • 2 LiF + _Br 2 -> 2 LiBr +_ F 2
      • 2 2 2 2 2 2
      • _Mg + _O 2 -> _MgO
      • _AgNO 3 + _NaCl -> _AgCl + _NaNO 3
      • _MgCl 2 + _Na 2 CO 3 -> _MgCO 3 + _NaCl
      • 4. _NaBr + _Cl 2 ->_NaCl +_Br 2
      • 5. _Cu + _S -> _Cu 2 S
      • 6. _Al(OH) 3 + _CO 2 -> _Al(HCO 3 ) 3
      • 7. _ Na + _H2O -> _NaOH + _H2