Which of the following statements is/are CORRECT? A system is defined as an obje

Question

Which of the following statements is/are CORRECT? A system is defined as an object or collection of objects being studied. Surroundings are defined as the entire universe, including the system. In an endothermic reaction, heat is transferred from the system to the surroundings. 1 only 2 only 3 only 1 and 3 1, 2, and 3 A hot piece of iron is dropped into a beaker containing colder water. Which of the following statements is/are CORRECT? Energy is transferred as heat from the iron to the water. Thermal equilibrium is attained when the iron and the water reach the same temperature. Thermal energy from the iron is converted to electrostatic energy in the water. 1 only 2 only 3 only 1 and 2 1, 2. and 3 Many homes are heated using natural gas. The combustion of natural gas converts chemical potential energy to thermal energy. thermal energy to mechanical energy. mechanical energy to chemical potential. electrostatic energy to mechanical energy, gravitational energy to acoustic energy. Which of the following processes is/are endothermic? the combustion of hydrogen the condensation of water the evaporation of isopropyl alcohol 1 only 2 only 3 only 1 and 3 1, 2, and 3

Explanation / Answer

(9) (a) 1 only

System is the part of universe which is under study.

Surroundings is the entire universe except system.

In an endothermic reaction heat is transfered from surroundings to system.

(10) (c) 1 and 2 are correct.

As hot iron piece is dropped in water heat is transfered from iron piece to water and after some time thye both reach to equilibrium.

(11) (a) Combustion of natural gas converts chemical energy to thermal energy

(12) (c) 3 only

All combustion reactions are exothemric

Condensation of water loses energy so, exothermic.

But evaporation requires energy, so it is endothermic

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