2. Calculate the amount of energy absorbed when 75g ice @ -4°C melts to 31°C. Did a phase change occur? If so, which one? Is this endothermic or exothermic?

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**Energy Absorption and Phase Change Calculation**

**Problem Statement:**

Calculate the amount of energy absorbed when 75 g of ice at -4°C melts to 31°C. Did a phase change occur? If so, which one? Is this process endothermic or exothermic?

**Explanation:**

In this problem, we need to find the total energy absorbed during the heating and phase change of ice. The process involves:

1. Heating the ice from -4°C to 0°C.
2. Melting the ice at 0°C.
3. Heating the resulting water from 0°C to 31°C.

**Steps:**

1. **Heating Ice (-4°C to 0°C):**  
   Use the specific heat capacity of ice to calculate the energy required to raise the temperature to 0°C.

2. **Melting Ice (at 0°C):**  
   Calculate the energy needed to melt the ice using the heat of fusion.

3. **Heating Water (0°C to 31°C):**  
   Use the specific heat capacity of water to find the energy required to increase the temperature of water to 31°C.

**Phase Change:**  
Yes, a phase change occurs from solid (ice) to liquid (water). This is an endothermic process since it requires the absorption of energy.

Remember, these calculations involve specific heat capacities and the heat of fusion, typically found in reference materials or textbooks.
Transcribed Image Text:**Energy Absorption and Phase Change Calculation** **Problem Statement:** Calculate the amount of energy absorbed when 75 g of ice at -4°C melts to 31°C. Did a phase change occur? If so, which one? Is this process endothermic or exothermic? **Explanation:** In this problem, we need to find the total energy absorbed during the heating and phase change of ice. The process involves: 1. Heating the ice from -4°C to 0°C. 2. Melting the ice at 0°C. 3. Heating the resulting water from 0°C to 31°C. **Steps:** 1. **Heating Ice (-4°C to 0°C):** Use the specific heat capacity of ice to calculate the energy required to raise the temperature to 0°C. 2. **Melting Ice (at 0°C):** Calculate the energy needed to melt the ice using the heat of fusion. 3. **Heating Water (0°C to 31°C):** Use the specific heat capacity of water to find the energy required to increase the temperature of water to 31°C. **Phase Change:** Yes, a phase change occurs from solid (ice) to liquid (water). This is an endothermic process since it requires the absorption of energy. Remember, these calculations involve specific heat capacities and the heat of fusion, typically found in reference materials or textbooks.
Expert Solution
Step 1

The change from -4°C to 31°C will have three process involved : 

a ) Heating of ice from -4°C to 0°C . 

b ) Phase change from solid to liquid at 0°C. 

c.) Then heating of liquid water from 0°C to 31°C . 

Total heat will be given as sum of heat from all three process. 

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