Question

Two identical beakers of water are heated from 20 °C to 100 °C by two different methods: 1. By placing the first beaker on a large hotplate at 100 °C 2. By placing the second beaker successively in contact with an infinite series of large hot plates. Each hot plate is at a higher temperature than the preceding one by an infinitesimally small amount. Explaining your answers full y: (a) (2 marks) How would you classify the two different methods? (b) (6 marks) How does the change in entropy (between the initial and final states) compare between the two methods for i. The beaker of water? ii. The hotplate(s)? iii. The universe?

Answer 1

1st is reversible and 2nd is irreversible because it is very slow process

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Entropy for beaker is negative because it gain temperature

For plate postive because it loose temperature

For universe remain Same