Question
question 1 and 3 please
Question 1 (2 points) o of 3 questions saved Determine the amount of heat lost by a 20-kg block of iron when its temperature drops from 90 °C to 10 °C. The specific heat capacity of iron is 450 3/kg.C Page 1: Legend Saved Response Unsaved Response Info Item Save Question 2 (1 point) Which of the following statements is correct? One calorie is the amount of heat necessary to raise the temperature of I gram of water by 1 Celsius degree, from 14.5 °C to 15.5°C The heat capacity of an object can be defined as the amount of heat needed to raise the temperature of of that object by The specific heat of an object is amount of heat required to change the temperature of unit mass of the object by t degrede. since no energy flows across the boundaries of the Calormetry is based on the conservation of energy for an isolated system since ne energy flows across the closed, isolated system All of these statements are correct Question 3 (2 points) Determine the amount of heat required to raise the temperature of 20-kg of water from 10 °C to 90 °c. Determine cale The specific hest capacity Quiz Status ot water is 1.00 cal/g.cs Quiz Started 888 F F5 F6 De F3 8 9 0 4 5 6 7 3
Explanation / Answer
1. Q = m C deltaT
Q = (20)(450)(90 - 10)
Q = 720000 J Or 720 kJ
3. Q = m C deltaT
Q = (20 x 10^3 g ) (1 cal / g deg C ) (80 deg C)
Q = 1600 x 10^3 cal or 1600 kCal
