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1. Write down the chemical formulae for these ionic compounds: Silver Chloride Magnesium Sulfate

When a lump of zinc is added into copper sulfate solution, the two slowly react to produce very small dark copper granules and zinc sulfate solution. Write down the word equation Write down the symbol equation Define ‘displacement reaction’.

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1. Write down the chemical formulae for these ionic compounds: Silver Chloride Magnesium Sulfate

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  1. When a lump of zinc is added into copper sulfate solution, the two slowly react to produce very small dark copper granules and zinc sulfatesolution. Write down the word equation Write down the symbol equation Define ‘displacement reaction’

  2. 1. Write down the chemical formulae for these ionic compounds: • Silver Chloride • Magnesium Sulfate • Sodium Hydroxide • Barium Carbonate • Potassium Nitrate • Iron (II) Sulfate • Zinc Hydroxide • 2. Circle the insoluble compounds

  3. Chemical Equations • Every chemical reaction has: • reactants (the stuff that react) and; • products (the stuff produced) • And the chemical equation always looks like: • Reactant(s) → Product(s)

  4. There are TWO types of chemical equations: 1. Word Equation Calcium + Water → Hydrogen + Calcium Hydroxide 2. Symbol Equation Ca + H2O → H2 + Ca(OH)2 One is simply the translated version of the other.

  5. EXAMPLE ONE

  6. EXAMPLE ONE Magnesium burns very brightly when heated. After the combustion, magnesium oxide (the white powder/ash) remains. What are the reactants? (hint: when something “burns” it reacts with oxygen) What is the product? Write down the chemical equation.

  7. EXAMPLE TWO Calcium metal reacts violently with water, producing hydrogen gas and calcium hydroxide. Reactants: Products: Chemical equation:

  8. EXAMPLE THREE When sodium hydroxide and barium nitrate are mixed together, white/cloudy precipitate is formed. Reactants: Products: Word equation: Symbol equation:

  9. When a lump of magnesium is dropped into a pool of hydrochloric acid, they react violently, producing hydrogen gas and magnesium chloride solution. Word Equation: Symbol equation:

  10. But there is a small problem… Compare the number of hydrogen atoms on each side Compare the number of chlorine atoms (ions) on each side This is an ‘unbalanced’ symbol equation

  11. *Balancing Symbol Equations Balance the equation by writing the number(s) in frontof the reactant(s) and/or product(s). HCl + Mg → H2 + MgCl2 Is this equation now balanced? Note: NEVER EVER change the formula of reactants or products 2

  12. Balanced or Unbalanced? H2 + O2 → H2O2 NaCl + AgNO3 → AgCl + NaNO3 CuSO4 + Zn → ZnSO4 + Cu NaOH + ZnSO4 → Na2SO4 + Zn(OH)2 HCl + NaOH → NaCl + H2O Mg + O2 → MgO H2 + O2 → H2O CaO + HCl → CaCl2 + H2O

  13. Balanced or Unbalanced? H2 + O2 → H2O2 NaCl + AgNO3 → AgCl + NaNO3 CuSO4 + Zn → ZnSO4 + Cu NaOH + ZnSO4 → Na2SO4 + Zn(OH)2 HCl + NaOH → NaCl + H2O Mg + O2 → MgO H2 + O2 → H2O CaO + HCl → CaCl2 + H2O 2 • 2 • 2 • 2 • 2 • 2

  14. Copy all equations; find the THREE unbalanced equations and balance them. a) Zn + Pb(NO3)2 → Pb + Zn(NO3)2 Mg + O2 → MgO Fe + CuSO4 → Cu + FeSO4 H2O → H2 + O2 HNO3 + Na2CO3 → NaNO3 + H2O + CO2

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