Chem to Go Chp 4 Section 1

  1. a) Exothermic because it is releasing energy when it dissolves and the water is absorbing that energy. b) Exothermic because when it goes from a gas to a liquid it is releasing energy. c) Endothermic because the copper is absorbing the oxygen energy.
  2. a) Disorder increases because the tablet is dissolving in the water which makes it aqueous. b) Disorder decreases because when it goes from a gas to a liquid, liquid particles are more orderly and compacted. c) Not possible to tell. 
  3. a) Reactants: 4Fe(s) + 3O2(g)   Products: 2FeO3(s)                                        a) Reactants: 2KClO3(s)   Products: 2KCl(s) + 3O2(g)                                            b) Disorder decreases because the product is a solid and the solid particles are very compact and orderly.                                                                            b) Disorder increases because the products are a solid and a gas and gas particles are more disorderly. 
  4. c)
  5. d)
  6. d)

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