Question : 81.              Which of the following an exothermic process? A)ice melting B)water evaporating C)boiling : 1335446

81.              Which of the following is an exothermic process?

A)ice melting

B)water evaporating

C)boiling soup

D)condensation of water vapor

E)Ammonium thiocyanate and barium hydroxide are mixed, resulting in a decrease in temperature of the surroundings.

82.              Which of the following processes is endothermic?

A)burning gasoline in an internal combustion engine

B)evaporation of perspiration on your skin

C)burning wood in a fireplace

D)condensing steam on a mirror

E)hot coffee cooling down as it sits on the table

83.              Which of the following is an exothermic process?

A)ice melting

B)water evaporating

C)boiling soup

D)condensation of water vapor

E)Ammonium thiocyanate and barium hydroxide are mixed, resulting in a decrease in temperature.

84.              Which of the following processes is exothermic?

A)boiling water to make tea

B)cooking an egg

C)heating food in a microwave oven

D)an acid and base reacting together, and causing the solution to become warm

E)water in a swimming pool getting warmer in the sun

85.              The following reaction consumes 393 kJ of heat for each mole of CO2 that reacts.

CO2(g)   ?  C(s) + O2(g)

This reaction

A)is endothermic.D)cannot possibly occur.

B)is exothermic.E)is a synthesis reaction.

C)has a negative q.

86.              A hot breeze may seem cool to a swimmer who has just come out of the water because

A)the evaporation of water from the swimmer’s wet body absorbs heat.

B)water is a good conductor of heat.

C)water has a high specific heat.

D)water has a higher density than air.

E)condensation of moisture in the air releases heat.

87.              Consider the following specific heats of metals.

Metal         Specific Heat (J/g °C)

copper          0.377

calcium     0.656

aluminum     0.895

iron          0.448

lead          0.129

If the same amount of heat is added to 25.0 g of each of these metals, all at the same initial temperature, which metal will have the highest final temperature?

A)  copper    B)  calcium    C)  aluminum    D)  iron    E)  lead

88.              Consider the following specific heats of metals.

Metal         Specific Heat (J/g °C)

copper          0.377

calcium     0.656

aluminum     0.895

iron          0.448

lead          0.129

If the same amount of heat is added to 50.0 g of each of these metals, all at the same initial temperature, which metal will have the lowest final temperature?

A)  copper    B)  calcium    C)  aluminum    D)  iron    E)  lead

89.              If 75.0 J of heat energy are added to separate 25.0 g samples of gold (C = 0.129 J/goC), silver (C = 0.234 J/goC), aluminum (C = 0.895 J/goC), chromium (C = 0.450 J/goC), and copper (C = 0.377 J/goC), rank the metals in order from least to greatest final temperature.

A)Au < Ag < Cu < Cr < Al B)Al < Cr < Cu < Ag < Au C)Au < Ag < Al < Cr < Cu D)Cr < Cu < Al < Ag < Au E)none of these—all final temperatures would be equal   90.              If an equal quantity of heat is transferred to 10.0 g samples of liquid water (C = 4.184 J/g?C), concrete (C = 0.88 J/g?C), asphalt (C = 0.920 J/g?C), glass (C = 0.84 J/g?C), and iron (C = 0.448 J/g?C), rank the final temperatures of the samples from least to greatest. A)iron < glass < concrete < asphalt < water B)water < asphalt < concrete < glass < iron C)asphalt < concrete < glass < iron < water D)iron < concrete < glass < asphalt < water E)water < concrete < asphalt < glass < iron