For each reaction you observed, the names of the reactants and products are given below. You must: 1. Write the correct formula for each reactant and product. 2. Balance each equation. A. Combination reactions 1. Magnesium + oxygen Mg + O₂ → 2MgO Oy 2. Sulfur + oxygen magnesium oxide sulfur dioxide B. Analysis of the Copper Content of a Penny 1. zinc + hydrochloric acid → zinc chloride + hydrogen Zn +2 HCl → ZnCl₂ + H₂ (unbalanced) (unbalanced) C. Single Replacement Reactions The subscripts on specific ions in the products are not always the same as the subscripts in the reactants. Not reaction I below. See how the nitrate ion has a subscript of one in silver nitrate and two in copper nitrate. 1. copper + silver nitrate → copper(II) nitrate + silver Cu + AgNO, → Cu(NO3)₂ + Ag 3. calcium + water → calcium hydroxide + hydrogen (unbalanced) 2. magnesium + hydrochloric acid → magnesium chloride + hydrogen D. Decomposition Reactions 1. copper(II) sulfate pentahydrate →→ copper(II) sulfate + water 2. ammonium carbonate → ammonia + water + carbon dioxide

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".