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CHEMICAL REACTIONS

CHEMICAL REACTIONS. WHAT IS A CHEMICAL REACTION HOW CAN YOU TELL IF A REACTION OCCURRED WHAT ARE THE DIFFERENT TYPES OF CHEMICAL REACTIONS. WHAT IS A CHEMICAL REACTION ?. A CHEMICAL REACTION IS A PROCESS IN WHICH SUBSTANCES UNDERGO CHEMICAL CHANGES . SOME EXAMPLES:

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CHEMICAL REACTIONS

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  1. CHEMICAL REACTIONS WHAT IS A CHEMICAL REACTION HOW CAN YOU TELL IF A REACTION OCCURRED WHAT ARE THE DIFFERENT TYPES OF CHEMICAL REACTIONS

  2. WHAT IS A CHEMICAL REACTION ? A CHEMICAL REACTION IS A PROCESS IN WHICH SUBSTANCES UNDERGO CHEMICAL CHANGES. SOME EXAMPLES: • 2 Na (s) + Cl2 (g) 2 NaCl (s) • HCl (aq) + NaOH (aq) NaCl (aq) + H2O • CH4(g) + 2 O2 (g) CO2(g) + 2 H2O (g) • NaHCO3 (s) + HC2H3O2 (s)NaC2H3O2(aq) + CO2(g) + H2O

  3. HOW CAN YOU DETERMINE IF A REACTION HAS OCCURRED ? COLOR CHANGE PRECIPITATE FORMED • GAS EVOLVED TEMPERATURE CHANGE

  4. TYPES OF CHEMICAL REACTIONS • SYNTHESIS REACTIONS • DECOMPOSITION REACTIONS • SINGLEREPLACEMENT REACTIONS (these are also called OXIDATION /REDUCTIONREACTIONS) • DOUBLEREPLACEMENT REACTIONS • ACID / BASE REACTIONS • COMBUSTION REACTIONS

  5. SYNTHESIS REACTIONS TWO OR MORE SUBSTANCES COMBINE TO FORM ONE SUBSTANCE • Cu + S  CuS • 2 H2 + O2 2 H2O

  6. DECOMPOSITION REACTIONS ONE SUBSTANCE DECOMPOSES OR COMES APART INTO TWO OR MORE SUBSTANCES • 2 KClO3 2 KCl + 3 O2 • CaCO3 CaO + CO2

  7. SINGLE REPLACEMENT REACTIONS AN ELEMENT AND A COMPOUND REACT. • ELEMENT IS A METAL- REPLACES THE METAL OF THE COMPOUND. • Cu + 2 AgNO3 2 Ag + Cu(NO3)2

  8. SINGLE REPLACEMENT CONTINUED….. • ELEMENT IS A NON-METAL - REPLACES THE NON-METAL OF THE COMPOUND. • Cl2 + 2 KBr  2 KCl + Br2 • F2 + 2 NaCl  2 NaF + Cl2

  9. DOUBLE REPLACEMENT REACTIONS A COMPOUND REACTS WITH ANOTHER COMPOUND • 2 KI + Pb(NO3)2 2 KNO3 + PbI2 • H2SO4 + Mg(OH)2 MgSO4 + 2HOH

  10. COMBUSTION REACTIONS A REACTION WITH OXYGEN • C3H8 + 5 O2 3 CO2 + 4 H2O • C2H5OH + 3 O2 2 CO2 + 3 H2O

  11. PRACTICE QUESTIONS: DETERMINE THE TYPE OF CHEMICAL REACTION: • 2 Li + CaS  Li2S + Ca • 3KOH + H3PO4 K3PO4 + 3 HOH • H2CO3 (aq) CO2 + H2O • CaO + H2O  Ca(OH)2

  12. PREDICT THE PRODUCTS: Mg (s) + F2(g)  MgF2(s) 2 HgO (s) 2 Hg (l) + O2(g) 2 Al (s) + 3 Pb(NO3)2(aq) 3 Pb(s) + 2 Al(NO3)3(aq) AgNO3(aq) +NaCl(aq) AgCl(s) + NaNO3

  13. THE END

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