1. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials Specific heat capacity of various materials

2. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials The specific heat capacity of a material is the amount of energy needed to raise the temperature of 1 kg of the material by 1°C. Its units are J/kg°C.

3. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials The amount of thermal energy an object stores is related to its mass and temperature. It is also related to the material the object is made of…

4. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials Some specific heat capacities are given in the table below. MaterialSpecific heat capacity J/kg°C Water4200 Aluminium880 Copper380

5. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials Using the specific heat capacity we can calculate the energy needed to raise the temperature of a material by a particular amount.

6. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials Calculate the energy transfer needed to bring 1.5 kg of water to the boil from a room temperature of 18°C Energy needed = mass  specific heat capacity  temperature change = 1.5 kg  4200 J/kg°C  (100 – 18)°C = 1.5  4200  82 J = 516 600 J = 516.6 kJ

7. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials Calculate the energy required to raise the temperature of 12 kg of aluminium from 15°C to 35°C Energy needed = mass  specific heat capacity  temperature change = 12 kg  880 J/kg°C  (35 – 15)°C = 12  880  20 J = 211 200 J = 211.2 kJ

8. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials 114 kJ of energy is required to raise the temperature of copper by 20°C. Calculate the mass of the copper. Energy needed = mass  specific heat capacity  temperature change 114 kJ= mass  380 J/kg°C  20°C 114 000 J = mass  7600 J/kg Mass = Mass = 15 kg

9. © Oxford University Press 2011 IP1.11.3 Specific heat capacity of various materials 10.8 kJ of energy is required to raise the temperature of 1 kg of cooking oil by 9°C. Show how you would calculate the specific heat capacity of cooking oil. Energy needed = mass  specific heat capacity  temperature change 10.8 kJ= 1 kg  specific heat capacity  9°C 10.8 kJ = 9 kg °C  specific heat capacity 10 800 J = 9 kg °C  specific heat capacity Specific heat capacity= = 1200 J/kg°C