alleryStart learning →A large and a small cast iron pan are compared. Which quantity is the same for both?
AThe heat capacity in joules per degree
BThe heat needed for a 50 degree rise
CThe specific heat in joules per gram degree
DThe mass of iron used to make the pan
Answer & Solution
Correct answer: C. The specific heat in joules per gram degree
1. The two pans are made of the same material but have different masses.
2. The heavier pan needs more energy for the same temperature rise, so its heat capacity is larger.
3. Dividing the heat by the mass as well removes that size effect.
4. Both pans then give 0.449 J per gram per degree Celsius.
5. So specific heat is the quantity that matches, since it depends on the material only.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.1 Energy Basics_
Keep practising Thermochemistry
Browse all Thermochemistry questions for NECO SSCE, or explore more Chemistry topics.
Related questions
Split heat given out from heat taken inUsing formation values of -278 for C2H5OH(l), -286 for H2O(l) and -394 kJ/mol for CO2(g), In a Hess's law problem a given step is reversed and then halved. What happens to its enthGiven N2 + O2 giving 2NO at +180.5 kJ and NO + half O2 giving NO2 at -57.06 kJ, what is thGiven Fe + Cl2 giving FeCl2 at -341.8 kJ, and FeCl2 + half Cl2 giving FeCl3 at -57.7 kJ, wCarbon burns to CO with an enthalpy change of -111 kJ, and CO burns to CO2 with -283 kJ. WWhat does Hess's law state?Given that 3O2(g) giving 2O3(g) has a standard enthalpy change of +286 kJ, what is the ent