CHEM 241 Lecture Notes - Lecture 5: Spectator Ion, Silver Bromide, Iron(Iii) Oxide
5 Sep 2016
School
Department
Course
Professor
Document Summary
Types of reactions : redox reactions, combination reactions, decomposition reactions, single replacement reactions, double-displacement reactions. Evidences for chemical reactions: color changes, formation of solid products (precipitates), evolution of gas bubbles, heat change. Chemical reactions involve the re-grouping of atoms in molecules or compounds. For example, when methane gas (ch4) reacts with oxygen, atoms in ch4 and o2 molecules break up and then recombine to form h2o and co2. This reaction is conveniently represented by a chemical equation. Word equation: methane gas + oxygen gas carbon dioxide gas + water vapor. Chemical equation: ch4(g) + 2 o2(g) co2(g) Exercise-1: write the unbalanced chemical equation for each of the following reactions: magnesium reacts with oxygen gas to form solid magnesium oxide. Calcium metal reacts with water to form calcium hydroxide precipitate and hydrogen gas. Solid ammonium carbonate decomposes when heated to produce solid ammonia gas, carbon dioxide gas, and water vapor. Nitrogen reacts with hydrogen to form ammonia gas.
