Question

1. Which of the following processes requires the largest input of energy as heat?

1. raising the temperature of 100 g of water by 1.0 ° C
2. vaporization of 0.10 g of water at 100 ° C
3. melting 1.0 g of ice at 0° C
4. warming 1.0 g of ice from -50° C to 0° C (Specific heat of ice = 2.06 J / g. k)

2. Ice (5.0 g) at 0°C is added to 25 g of liquid water at 20°C. Which statement best describes the system when thermal equilibrium is reached?

1. Part of the ice has melted; the remaining ice and water are at 0° C
2. All of the ice melts; liquid water is at a temperature between 0° C and 10°C
3. All of the ice melts; liquid water is at a temperature between 10°C and 20°C
4. Part of the ice melts; the ice-water mixture is at a temperature between 0°and 10°C