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Published byDaisy Copeland Modified over 9 years ago
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Get a h/w page, Organization tree w/s, and a solubility rules page Complete the Warm up at your table (Single replacement and combustion) You will need paper and something to write with Today we will be discussing: “How do you recognize and represent chemical changes?” Homework: Double Replacement W/S Important Dates: 4/2: Reaction Test
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Double Replacement Reactions: A reaction which involves the exchange of ions between two compounds AB + CD → AD + CB Ca(OH) 2 (aq) + 2HCl(aq) → CaCl 2 (aq) + 2H 2 O(l) 2NaOH(aq) + CuCl 2 (aq) → 2NaCl(aq) + Cu(OH) 2 (s)
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All in aqueous solutions! 3 types of Double Replacement reactions Formation of precipitate Formation of water Formation of a product which decomposes into a gas
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Solubility rules!!!!! AB(aq) + CD(aq) → AD(aq) + CB(s) NaCl(aq) + AgNO 3 (aq) → AgCl(s) + NaNO 3 (aq) BaCl 2 (aq) + Na 2 SO 4 (aq) → ? BaCl 2 (aq) + Na 2 SO 4 (aq) → BaSO 4 (s) + 2NaCl(aq) Na 2 SO 4 (aq) + CaCl 2 (aq) → ? Na 2 SO 4 (aq) + CaCl 2 (aq) → CaSO 4 (s) + NaCl(aq)
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Between Acids and Bases (H + /OH - ) HX(aq) + YOH(aq) → XY(aq) + H 2 O(l) HCl(aq) + NaOH(aq) → NaCl(aq) + H 2 O(l) H 2 SO 4 (aq) + Mg(OH) 2 → ? H 2 SO 4 (aq) + Mg(OH) 2 → MgSO 4 (aq) + H 2 O(l) H 3 PO 4 (aq) + KOH → ? H 3 PO 4 (aq) + KOH → K 3 PO 4 + H 2 O(l)
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Three products will decompose into gasses: H 2 CO 3 → CO 2 (g) + H 2 O(l) NH 4 OH → NH 3 (g) + H 2 O(l) H 2 SO 3 → SO 2 (g) + H 2 O(l) CaCO 3 (s) + HCl(aq) → H 2 CO 3 (aq) + CaCl 2 (aq) NaOH(aq) + NH 4 Br(aq) → NaBr(aq) + NH 4 OH(aq) H 2 CO 3 → CO 2 (g) + H 2 O(l) NH 4 OH → NH 3 (g) + H 2 O(l)
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Some DR can create gases without decomposition of a product Not very common, but they do occur HCl(aq) + FeS(s) → FeCl 2 (aq) + H 2 S(g) NaCN(aq) + HCl(aq) → NaCl(aq) + HCN(g)
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AsCl 3 (aq) + H 2 S(aq) → ? 2AsCl 3 (aq) + 3H 2 S(aq) → As 2 S 3 (s) + 6HCl(aq) HCl(aq) + CaCO 3 (aq) → ? 2HCl(aq) + CaCO 3 (aq) → CO 2 (g) + CaCl 2 (aq) + H 2 O(l) FeCl 3 (aq) + NaOH(aq) → ? FeCl 3 (aq) + 3NaOH(aq) → Fe(OH) 3 + 3NaCl(aq) H 2 SO 4 + KOH → ? H 2 SO 4 + 2KOH → 2H 2 O(l) + K 2 SO 4 (aq) HNO 3 + Ca(CN) 2 →? 2HNO 3 + Ca(CN) 2 →2HCN + Ca(NO 3 ) 2
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