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7.2 Writing Chemical Equations

7.2 Writing Chemical Equations. By: Jake Poserina and Tyler Dunphy. What is a Chemical Equation?. A Chemical Equation is an expression representing a chemical reaction The reactants on the left and the formula of the products on the right

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7.2 Writing Chemical Equations

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  1. 7.2 Writing Chemical Equations By: Jake Poserina and Tyler Dunphy

  2. What is a Chemical Equation? • A Chemical Equation is an expression representing a chemical reaction • The reactants on the left and the formula of the products on the right • These reactants are connected by an arrow called a yield • Ex. Fe + O₂ → Fe₂O₃

  3. Symbols Used In Chemical Equations

  4. Skeleton Equations • A Skeleton Equation is a chemical equation that does not indicate the relative amounts of the reactants and products. Use (s) for soled, (l) for a liquid, (g) for a gas, (aq) for an aqueous solution.

  5. Catalysts • A catalyst is a substance that speeds up a reaction without being used up. • Because a catalyst is neither a reactant nor a product, its formula is written above the arrow in a chemical equation. MnO₂ H₂O₂→H₂O(l)+O₂(g)

  6. Question 1 Write a skeleton equation for this chemical reaction: when calcium carbonate is heated, calcium oxide and carbon dioxide are produced. ∆ CaCO₃(s)→CaO(s)+CO₂(g)

  7. Question 2 Solid sulfur burns in oxygen gas to form sulfur dioxide gas. S+O₂→SO₂

  8. Oxygen gas can be made by heating potassium chlorate in the presense of the catalyst manganese (IV) oxide. Potassium chloride is left as a solid residue. A. CaCO₃(aq)→CaO+CO₂ B. KClO₃→KCl+MnO₅ C. KClOMn→ClO+KMn D. KClO₃+MnO₂→KCl+MnO₅

  9. When solid mercury(II) sulfide is heated with oxygen, liquid mercury metal and gaseous sulfur dioxide are produced • HgS+O₂→Hg+SO₂ • HgS→Hg+SO₂ • HgSO→Hg+SO

  10. Shout out to my favorite teacher @scottsweeten! #scienceproject

  11. Mr. Sweeten’s class unit 7.2 Tyler Dunphy & Jake Poserina Homework: Write a Vendiagram on the difference's of skeletal equations, and regular chemical equations.

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