Introduction to the Classes of Chemical Reactions
r Lab Report 5 Introduction to the Classes of Chemical Reactions Course: Chem. 1151L, Tuesday & Thursday June 23, 2011 Mr. Nasir Uddin Pre Lab Questions: 1. CaBr2 (aq) + K3PO4 (aq) > CA(PO4)2(S) + KBr (aq) = Ca3(PO4)2 + 6 KBrDouble Replacement 2. Li(s) + O2(g) = Li2O(s) =2 Li2O Decomposition 3. CH4 + O2 = CO2 + H2O = CO2 + 2 H2OCombination 4. AgBr(s) = Ag (s) + Br2(l)= 2 Ag + Br2Combination 5. Mg(s) + H2SO4 (aq)= MgSO4 + H2Decomposition Table Three: Formation of Salt via Double Replacement Reaction 0. 1 KNO3* (NO3)2 0. M AgNO3 0. 1M NaClTube 1: KNO3+NaClTube 3: Fe(NO3)3+NaClTube 5: AgNO3+NaCl PredictionNo change No changeNo change Observation Change: Liquid is no longer fluidLiquid became lighterBubbles, carbon, color change, white separation 0. 1M NaOHTube 2: KNO3+NaOHTube 4: Fe(NO3) 3+NaOHTube 6: AgNo3+NaOH Prediction No changeChangeChange Observation No changeLiquid became dark brown orangeColor changed / brown / separation Na2CO3 + HNO3 > NaNO3 + H2O + CO2 (Na2CO3 + HNO3)Liquid started to bubble – carbon dioxide Procedure 3: Single Replacement Reactions
Table 1. Metals and the Reactivity Series; reaction with DI water. Tube # & contentsName of MetalPrediction w/ DI H2OObservation 1. Control H2ONo metal addedPure water only 2. CuCopperNo changeNo change 3. FeIronNo changeColor change- 3 min 4. CaCalciumNo changeInstant, vigorous bubbles, boiling, warm 5. MgMagnesiumNo changeNo change Table 2. Metals and the Reactivity Series; reaction with 6M HCI. MetalsName of MetalPrediction w/ HCIObservation 6. Control HCLNo metal addedHCI only No change 7. CuCopperNo changeNo change 8.
FeIronChangeBubbles / Iron dissolved 5 min. 9. CaCalciumNo changeInstant dissolve, bubbles, smell of gas, boiling 10. MgMagnesiumChangeBubbles appear instantly Questions for Procedure2: 1. Ca+H2O=CaO+H2 Fe+2HCI=FeCl2+H2 Ca+ 2HCI=CaCl2+H2 Mg+2HCI=MgCl2+H2 2. Pb(NO3)2 + NaOH = NaNO3 + Pb(OH)2 3. CaCl2 + NaOH = Ca(OH)2 + NaCl Question for Procedure 3: My prediction did not always agree with my observation. Calcium is an active metal. Metal can displace hydrogen from both water and hydrochloric acid. Cu, Fe and Mg are weaker and only react with acid as HCI.
