CHE 110 Lecture Notes - Lecture 5: Joule, Lead(Ii) Nitrate, Sodium Hydroxide
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A chemical reaction: macroscopic (physical changes that you see) Symbolic: nahco3 (s) + hc2h3o2 (aq) --> h2o (l) +co2 (g) +na2co3 (aq) True or false: particles are conserved during a chemical reaction. Explain your choice: true if particles = atoms, false if particles = molecules. True or false: when balancing an equation, you never add subscripts to balance it. Explain your answer: true, can"t change the ingredients in the recipe. Write as a balanced equation: zinc sul de + oxygen --> zinc oxide + sulfur dioxide: 2zns + 3o2 --> 2zno + 2so2. Metathesis reactions: also called double displacement/replacement, cations and anions exchange partners. !1: charge still balance new compounds, but value didn"t change. Monday, september 12, 2016: types: precipitation, acid-base, gas-evolving. Oxidation reduction reactions (redox reactions: electrons are transferred and/or shared, change in oxidation number for at least 2 elements [charges change, types:
