Definition: This is an experimental group, used as a baseline comparison, that receives all the control variables, but does not receive the independent variable treatment. Example: The effects of new medical drugs are compared these, which do not take the drug.

Term:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.