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Understanding Chemical Equations: Basics and Symbols Explained

Learn the essentials of chemical equations, from reactants to products, symbols used, and the role of catalysts. Practice with examples to grasp the concept effectively. Dive into the world of chemistry with this comprehensive guide!

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Understanding Chemical Equations: Basics and Symbols Explained

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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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