module 3: 9.2 measuring enthalpy changes

Question 1

define the term specific heat capacity

Answer 1

The SHC (c) is the energy required to raise the temperature of 1g of a substance by 1K

Question 2

reasons why the enthalpy change of combustion is lower than normal

Answer 2

• heat loss to the surroundings other than the water (less exothermic, smaller - number)
• incomplete combustion of methanol (less exothermic, smaller - number)
• evaporation of methanol from the wick (less exothermic, smaller - number)
• non-standard conditions (more exothermic larger - number)