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Starter 2/6

Starter 2/6. Write the word equation from the following description: Zinc metal is added to hydrochloric acid to create zinc chloride and hydrogen gas. Ch. 8 Chemical Equations and Reactions. 8.1b Balancing Equations and Writing Formula Equations. Balancing Equations.

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Starter 2/6

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  1. Starter 2/6 • Write the word equation from the following description: Zinc metal is added to hydrochloric acid to create zinc chloride and hydrogen gas.

  2. Ch. 8 Chemical Equations and Reactions 8.1b Balancing Equations and Writing Formula Equations

  3. Balancing Equations • ONLY add/change coefficients- NEVER subscripts!!! • balance one type of atom at a time • balance polyatomic ions first • balance atoms that appear only once second • balance H and O last • simplify if you can • Check at end!

  4. Writing Equations • Write Word equations to help you organize reactants and products • Be sure to include symbols showing states of each reactant and product • Be sure to write the correct formula for each (crossing over for ionic compounds!) • Check your balancing of the equation when you are finished

  5. Example 1 • Description: Zinc metal is added to hydrochloric acid to create zinc chloride and hydrogen gas. • Word Equation: zinc + hydrochloric acid  zinc chloride + hydrogen

  6. Example 1 • Formula Equation: Zn (s) + HCl(aq)  ZnCl2(aq) + H2(g) • Balanced Formula Equation Zn (s) + 2HCl(aq)  ZnCl2(aq) + H2(g)

  7. Example 2 • Solid calcium metal reacts with water to form aqueous calcium hydroxide and hydrogen gas. • calcium + water  calcium hydroxide + hydrogen • Ca(s) + H2O(l)  Ca(OH)2(aq) + H2(g) • Ca(s) + 2H2O(l)  Ca(OH)2(aq) + H2(g)

  8. Example 3 • solid zinc metal reacts with aqueous copper (II) sulfate to produce solid copper metal and aqueous zinc sulfate • zinc + copper (II) sulfate  copper + zinc sulfate • Zn(s) + CuSO4(aq)  Cu(s) + ZnSO4(aq) • Zn(s) + CuSO4(aq)  Cu(s) + ZnSO4(aq)

  9. Example 4 • Hydrogen peroxide in an aqueous solution decomposes to produce oxygen and water • hydrogen peroxide  oxygen + water • H2O2(aq)  O2(g) + H2O(l) • 2H2O2(aq)  O2(g) + 2H2O(l)

  10. Example 5 • Solid copper metal reacts with aqueous silver nitrate to produce solid silver metal and aqueous copper (II) nitrate • copper + silver nitrate  silver + copper (II) nitrate • Cu(s) + AgNO3(aq)  Ag(s) + Cu(NO3)2(aq) • Cu(s) + 2AgNO3(aq)  2Ag(s) + Cu(NO3)2(aq)

  11. Example 6 • Carbon dioxide gas is bubbled through water containing solid barium carbonate, creating aqueous barium bicarbonate • carbon dioxide + water + barium carbonate  barium bicarbonate • CO2(g) + H2O(l) + BaCO3(s)  Ba(HCO3)2(aq) • CO2(g) + H2O(l) + BaCO3(s)  Ba(HCO3)2(aq)

  12. Example 7 • Acetic acid solution is added to a solution of magnesium bicarbonate to create water, carbon dioxide gas, and aqueous magnesium acetate. • acetic acid + magnesium bicarbonate  water + carbon dioxide + magnesium acetate • HCH3COO(aq) + Mg(HCO3)2(aq)  H2O(l) + CO2(g) + Mg(CH3COO)2(aq) • 2HCH3COO(aq) + Mg(HCO3)2(aq)  2H2O(l) + 2CO2(g) + Mg(CH3COO)2(aq)

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