12. Two spheres, labeled A and B, have identical masses, but are substances. The
ID: 1837796 • Letter: 1
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12. Two spheres, labeled A and B, have identical masses, but are substances. The specific suosances. The specific heat capacity of sphere A is 645 J/kg C) and that of sphere B ve identical masses, but are made of different 240 /(kg C). The spheres are initially at 21 °C; and the same quantity of heat is added to each approximate final temperature of sphere B? A) 160 °C B) 140 °C C) 110°C D) 53°C E) 39°C sphere. If the final temperature of sphere A is 74 °C, what is the 13. A 2.00-kg metal object requires 1.00x 10' J of heat to raise its temperature from 20.0 °C to 40.0 °C, what is the specific heat capacity of the metal? A) 50.0 J/(kg C°) B) 125 J/(kg C C) 250 J/(kg C°) D) 500 J/(kg C°) E) 1.00 x 10'J/(kg C 14. A 0.30-kg lead ball is heated to 90.0 °C and dropped into an ideal calorimeter containing 0.50 kg of water initially at 20.0 °C. What is the final equilibrium temperature of the lead ball? The specific heat capacity of lead is 128 J/(kg·C"); and the specific heat of water is 4186 J/(kg·C"). A) 84.8 °C B) 20.8°C C) 21.3°C D) 27.8°C E) 32.1 °C 15. Heat is added to a substance, but its temperature does not rise. Which one of the following statements provides the best explanation for this observation? A) The substance must be a gas. B) The substance must be a non-perfect solid. C) The substance undergoes a change of phase. D) The substance has unusual thermal properties E) The substance must be cooler than its environment. 16. Which would cause a more serious burn: 30 g of steam or 30 g of liquid water, both at 100 °C; and why is this so? A) Water, because it is denser than steam. B) Steam, because of its specific heat capacity. C) Steam, because of its latent heat of vaporization. D) Water, because its specific heat is greater than that of steam. E) Either one would cause a burn of the same severity since they are both at the same temperature.Explanation / Answer
As of your question order of secound page answers,
1.) [E]20+273 = 293K as generally room temperature taken as about 20°C
2.) [B] 30K as the addition of 273 cancel when subtracted.
3.) [C] 106°F using convertion formula
4.) [E] -459.67°F Using the convertion formula
5.) [A] The mass of an object does not depend on temperature but the rest does depend.
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