k Activity 1: Heat and Internal Energy Identify how heat causes the increase of internal energy of water. Study the Figure 1 below and answer the following questions. 100 CELSIUS 1. The System A's Internal. energy after the contact of heat. 2. The greatest temperature after boiling. 3. The boiling point of both system's internal energy during. 4. The initial body temperature of System B. 5. The body system which has the warmer temperature. Guide Question: 75 92 Refore 1. Compare the temperature of the water before boiling, while boiling and after boiling. During After 2. What does the increase temperature shows? Figure 1. Change in System's Internal Energy Internal Energy of the substance is the total molecular kinetic energy, molecular potential energy and other types of molecular energy. Heat allows the transfer of internal energy of the hot substances to cold substances as it originate the internal energy of a substance. The law is expressed as: AU = Q-W 8​