What is meant by the specific heat capacity of a substance?
It is the amount of energy required to increase the temperature of one gram of a body by one Kelvin unit, expressed as J/K/g. The specific heat capacity also can be measured in J/K/Kg and J/K/mol.
Substance Specific heat Capacity (J/K/g)
Water 4.18 acetone 2.17 hexane 2.26
Compare the specific heat capacity of water with a range of other solvents.
The table compares the heat capacities of water and two other solvents.
Compare the specific heat capacity of water to other substances (e.g ethanol) providing an example of why water is used in industry based on this property.
Results & calculations 힓H = mC힓T
Methanol CH3OH Propenol C3H8O Ethanol C2H5OH m = 3.6g m= 3.4g m=8.3g …show more content…
Repeat steps 4-7 using ethanol and propane.
14. Calculate the molar heat to measure the change in temperature when substances dissolve in water using the formula ∆H=mC∆T.
Calorimetry experiment or method is the process of measuring the amount of heat released or absorbed throughout a chemical reaction. By knowing the change in heat, it can be determined if a reaction is exothermic or endothermic. Some substances dissolve in some solutions and produce energy in the form of heat. These dissolution reactions are known as exothermic reactions. Example on the exothermic reactions is the reaction between sulphuric acid and water. When we put the sulphuric acid into water amount of heat is being produced. Exothermic reactions are characterised by negative heat flow (-ΔH). H2O + H2SO4 ---------> (HSO4) - + (H3O) +
Another example on endothermic reactions is Photosynthesis. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction needs 15MJ of energy from sunlight for every kilogram of glucose that is produced Sunlight + 6CO2 (g) + H2O (l) ---------> C6H12O6 (aq) + 6O2
It is the amount of energy required to increase the temperature of one gram of a body by one Kelvin unit, expressed as J/K/g. The specific heat capacity also can be measured in J/K/Kg and J/K/mol.
Substance Specific heat Capacity (J/K/g)
Water 4.18 acetone 2.17 hexane 2.26
Compare the specific heat capacity of water with a range of other solvents.
The table compares the heat capacities of water and two other solvents.
Compare the specific heat capacity of water to other substances (e.g ethanol) providing an example of why water is used in industry based on this property.
Results & calculations 힓H = mC힓T
Methanol CH3OH Propenol C3H8O Ethanol C2H5OH m = 3.6g m= 3.4g m=8.3g …show more content…
Repeat steps 4-7 using ethanol and propane.
14. Calculate the molar heat to measure the change in temperature when substances dissolve in water using the formula ∆H=mC∆T.
Calorimetry experiment or method is the process of measuring the amount of heat released or absorbed throughout a chemical reaction. By knowing the change in heat, it can be determined if a reaction is exothermic or endothermic. Some substances dissolve in some solutions and produce energy in the form of heat. These dissolution reactions are known as exothermic reactions. Example on the exothermic reactions is the reaction between sulphuric acid and water. When we put the sulphuric acid into water amount of heat is being produced. Exothermic reactions are characterised by negative heat flow (-ΔH). H2O + H2SO4 ---------> (HSO4) - + (H3O) +
Another example on endothermic reactions is Photosynthesis. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction needs 15MJ of energy from sunlight for every kilogram of glucose that is produced Sunlight + 6CO2 (g) + H2O (l) ---------> C6H12O6 (aq) + 6O2