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Writing Chemical Equations to Symbolize Chemical Reactions

Writing Chemical Equations to Symbolize Chemical Reactions. Chapter 6 & 7. 1. Solid aluminum metal reacts with oxygen gas to produce solid aluminum oxide. Write the formulas of the reactants and products. Al + O 2 → Al 2 O 3 Add symbols to indicate physical state.

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Writing Chemical Equations to Symbolize Chemical Reactions

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  1. Writing Chemical Equationsto Symbolize Chemical Reactions Chapter 6 & 7 1

  2. Solid aluminum metal reacts with oxygen gas to produce solid aluminum oxide. • Write the formulas of the reactants and products. • Al + O2 → Al2O3 • Add symbols to indicate physical state. • Al(s) + O2(g) → Al2O3(s) • Balance (Law of Conservation of Mass) • 4Al(s) + 3O2(g) → 2Al2O3(s) • Synthesis Reaction 2

  3. Electrical current through water.Electrolysis of water into its elements. • Write the skeleton equation • H2O → H2 + O2 • Put in physical state symbols • H2O(L) → H2(g) + O2(g) • Balance • 2 H2O(L) → 2 H2(g) + O2(g) • Decomposition 3

  4. Solid iron rusts. Solid iron reacts with oxygen gas to produce iron(III) oxide. • Write the skeleton equation • Fe + O2 → Fe2O3 • Put in physical state symbols • Fe(s) + O2(g) → Fe2O3(s) • Balance • 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) • Synthesis (aka combination) 4

  5. Ammonium Nitrate dissolves.Since we have defined dissolving as a physical change, this is NOT a chemical reaction, just a physical change. • Write the skeleton equation • NH4NO3 → NH4+ + NO3− • Put in physical state symbols • NH4NO3(s) → NH4+(aq) + NO3−(aq) • Balance • Already balanced. • Dissolving 5

  6. Aqueous sodium dichromate is reacted with aqueous lead(II) nitrate to produce a solid precipitate of lead(II) dichromate and aqueous sodium nitrate. • Write the skeleton equation Na2Cr2O7 + Pb(NO3)2 → PbCr2O7 + NaNO3 • Put in physical state symbols Na2Cr2O7(aq) + Pb(NO3)2(aq) → PbCr2O7(ppt) + NaNO3(aq) • Balance Na2Cr2O7(aq) + Pb(NO3)2(aq) → PbCr2O7(ppt) + 2NaNO3(aq) • Double Replacement 6

  7. Solid potassium metal is reacted with water to produce aqueous potassium hydroxide and hydrogen gas. • Write the skeleton equation • K + H2O → KOH + H2 • Put in physical state symbols • K(s) + H2O(L)→ KOH(aq)+ H2(g) • Balance • 2K(s) + 2H2O(L) → 2KOH(aq) + H2(g) • Single Replacement 7

  8. Solid calcium reacted with liquid water to produce aqueous calcium hydroxide and hydrogen gas. • Write the skeleton equation • Ca + H2O → Ca(OH)2 + H2 • Put in physical state symbols • Ca(s) + H2O(L)→ Ca(OH)2(aq) + H2(g) • Balance • Ca(s) + 2H2O(L) → Ca(OH)2(aq) + H2(g) • Single Replacement 8

  9. Solid zinc reacts with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas. • Write the skeleton equation • Zn + HCl → ZnCl2 + H2 • Put in physical state symbols • Zn(s)+ HCl(aq) → ZnCl2(aq)+ H2(g) • Balance • Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) • Single Replacement 9

  10. Burning of methane gas, CH4 • Write the skeleton equation • CH4 + O2 → H2O + CO2 • Put in physical state symbols • CH4(g) + O2(g) → H2O(g) + CO2(g) • Balance • CH4 (g) + 2O2(g) → 2H2O(g) + CO2(g) • This is the gas that comes through our Bunsen burners. • Combustion 10

  11. Nylon is formed from hexamethylenedamine reacting with sebacoyl chloride to produce the nylon polymer and hydrochloric acid. • Nylon is a generic term to represent a particular type of polymer. • C6H12N2H6 + C6H8Cl2O2 → C12H20O2N2H4 + 2 HCl • Balance • C6H12N2H6 + C6H8Cl2O2 → C12H20O2N2H4 + 2 HCl • This is a typical polymerization reaction. • Polymer = many mers (repeating small units) • Polymerization = making polymers from monomers. 11

  12. Polymerization - making large molecules from small units You may remember that many glucose molecules hooked together make the polymer starch or cellulose 12

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