Chapter 5 Principles of Chemical Reactivity Energy MULTIPLE CHOICE 1 A hot piece of iron is dropped into a beaker containing colder water Which of the following statements is are CORRECT 1 Energy is transferred as heat from the iron to the water 2 Thermal equilibrium is attained when the iron and the water reach the same temperature 3 Thermal energy from the iron is converted to electrostatic energy in the water 2 Which of the following processes is are exothermic the reaction of butane with oxygen the melting of gold cooling copper from 225 C to 65 C 3 Heat capacity is defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 K the amount of heat required to raise the temperature of a substance by 1 K the amount of heat required to vaporize a solid or liquid the maximum amount of heat that a substance may absorb without decomposing 4 If 495 J is required to change the temperature of 12 7 g of sodium chloride from 275 0 K to 335 0 K what is the specific heat capacity of sodium chloride a 0 866 J g K b 2 60 J g K c 0 650 J g K d 1 15 J g K e 2 83 105 J g K ANS C mixture The specific heat capacity of water is 4 184 J g K a 25 1 C b 45 4 C 5 If 35 0 g H2O at 22 7 C is combined with 65 0 g H2O at 87 5 C what is the final temperature of the a 1 only b 2 only c 3 only d 1 and 2 e 1 2 and 3 ANS D 1 2 3 a 1 only b 2 only c 3 only d 1 and 3 e 1 2 and 3 ANS D a b c d e 4 18 cal g K ANS B c 50 8 C d 64 8 C e 48 9 C ANS D