Investigations‎ > ‎CSCS Investigations‎ > ‎Chemistry‎ > ‎

Endothermic and Exothermic Reactions

Use probeware to test the following reactions and report if they are exothermic or endothermic.

(1) CaO(s) + H2O(l) -→ Ca(OH)2(s)    (Lime + water)

(2) NH4NO3(s) +  H2(l) → NH4+(aq) + NO3-(aq)  (ionization of ammonium nitrate, a fertilizer)

(3) HCl(dilute) + NaOH(dilute) → H2O + NaCl  (Neutralization) 

(4) NaCl + H2O → Na+(aq)  + Cl-(aq)  (dissolving table salt)

(5) CaCl2 + H2O → Ca+ (aq) +2Cl-(aq) (De-icing roads)

(6) NaHCO3(s) + HCl(aq) →H2O(l) + CO2(g) + NaCl(aq)  (Neutralization)

(7) CH3COOH(aq)+NaHCO3(s) →CH3COONa(aq)+H2O(l)+CO2(g)  (Baking soda & vinegar)

(8) Ba(OH)2.8H2 (s) + 2 NH4SCN (s)  Ba(SCN)2 (s) + 10 H2O (l) + 2NH3 (g)

(9) KCl + H2O → K+(aq)  + Cl-(aq)  (dissolving potassium chloride)

Put graphs of temperature vs. time for each reaction on this sheet

Comments