(b) The test-tube transfers thermal energy from the water to the stearic acid.
By what method is most of the thermal energy transferred?
Tick the correct box.
conduction
evaporation
convection
radiation

here are some of the ways in which chemical and nuclear reactions differ.

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.