Reference no: EM132410060

1. A cold piece of iron at room temperature is dropped into a beaker containing hot water at 80°C. Which of the following statements is/are CORRECT? Energy is transferred as heat from the water to the iron. 2. Thermal equilibrium is attained when the iron and the water reach the same temperature. 3. Thermal energy increases in the water. a. 1 only b. 2 only c. 3 only d.1 and 2 e. 1,2 and 3
2. Which of the following statements is/are CORRECT? A system is defined as an object or collection of objects being studied. 2. Surroundings are defined as the entire universe, including the system. 3. In an endothermic reaction, heat is transferred to the system from the surroundings. 1 only b. 2 only c. 1 and 3 d. 2 and 3 e.1,2, and 3
3. Which of these physical changes would require energy from the surroundings? A. Cooling down hot water to room temperature b.freezing a liquid to solid c. Sublimating a solid to gas d. condensing a gas to liquid e.none of these
4. Specific heat capacity is defined as a. the amount of heat required to change the temperature of 1.00 g of a substance by 1 K. b. the amount of heat required to change the temperature of 4.18 g of a substance by 1 K. C. the amount of heat required to vaporize 1.00 g of a solid or liquid. d. the maximum amount of heat that a substance may absorb without decomposing. E. the temperature change undergone when 1.00 g of a substance absorbs 4.184.
5. Many homes are heated using natural gas. The combustion of natural gas converts a. chemical potential energy to mechanical energy. b. thermal energy to mechanical energy c. chemical potential energy to thermal potential. d. electrostatic energy to mechanical energy. e. None of the above
6. A 20.0-L sample of oxygen at 4.52 atm and 27°C is simultaneously expanded to 60.0 L and heated to 47°C. What is the new pressure of the gas?