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Transcript
Types of Reactions Law of Conservation of Mass •During a chemical reaction, the total mass of the reactants is equal to the total mass of the products. Atoms are not created nor destroyed. Law of Conservation of Mass •Reactants: chemical present at the start of a chemical reaction •Products: A chemical produced during a chemical reaction Types of Chemical Reactions • Atoms and molecules react to create chemical reactions. • There are thousands of different chemical reactions, where atoms are never lost, just rearranged. H2O → H2 + O2 SiO2 + HF → SiF4 + H2O Pb + H3PO4 → H2 + Pb3(PO4)2 Cu + HCl → H2 + CuCl2 Types of Chemical Reactions 4 Major Types (Patterns) – Synthesis – Decomposition – Single Displacement – Double Displacement 1. Synthesis • Two reactants combine to make a new substance. X + Y → XY ie. Na + Cl2 → NaCl (When 2 become 1.) Synthesis To m Kati e Tomkat Synthesis Rxn Real Life: Table Salt 2. Decomposition • One substance breaks apart into 2 substances. XY → X + Y ie. H2O2 → H2O + O2 (Breakin’ Down) Decomposition Tomkat Tom Katie Decomposition Demo: Peroxide Elephant toothpaste Experiment Decomposition Rxn Real Life: Ammonium Nitrate (Fertilizer) Carbonic acid (Pop Fizz) Is each reaction synthesis or decomposition? 1. Ag2CO3 → Ag2O + CO2 Decomposition 1. P4 + O2 P4O10 Synthesis 1. Fe + O2 Fe2O3 Synthesis 1. KClO3 → KCl + O2 Decomposition Synthesis Decomposition 3. Single Displacement •One element takes the place (displaces) of another element in a compound. Like stealing a dance partner. A + BX → AX + B ie. HCl + Zn → H2 + ZnCl2 Brad & Jen Angelina Brangelina Jennifer Single Displacement Rxn Real Life: 2AgNO3(aq) + Cu(s) → Cu(NO3)2(aq) + 2Ag(s) 4. Double Displacement • Cations of two compounds exchange places to form 2 new compounds. Like switching dance partners. AB + CD → AD + CB ie. NaOH + HCl → NaCl + H2O Dawson Pacey & Jen & Joey Dawson & Jen Pacey & Joey Try Some. Is it single displacement (SD) or double displacement (DD)? 1. NaBr + Ca(OH)2 → CaBr2 + NaOH DD 1. Pb + H3PO4 → H2 + Pb3(PO4)2 SD 1. Li3N + NH4NO3 → LiNO3 + (NH4)3N DD 1. CuSO4 + Al → Al2(SO4)3 + Cu SD Putting it all together: Which Type of Reactions are the following: a) H2O → H2 + O2 Decomposition b) SiO2 + HF → SiF4 + H2O Double Displacement c) H2 + O2 → H2O d) Cu + HCl → H2 + CuCl2 Synthesis Single Displacement Try Worksheet
