The document discusses endothermic and exothermic reactions. It defines endothermic reactions as those that require energy input to occur, while exothermic reactions release energy. Specific examples are given of endothermic processes like photosynthesis and forming NaCl ions, and exothermic processes like burning fossil fuels. Methods for measuring the temperature change of reactions to determine if they are endothermic or exothermic are also outlined.
4. Endothermic process: a
change (e.g. a chemical
reaction) that requires (or
absorbs) heat.
Photosynthesis is an
endothermic reaction
(requires energy input
from sun)
Forming Na+
and Cl-
ions
from NaCl is an
endothermic
process
10. EXOTHERMIC & ENDOTHERMIC REACTIONSEXOTHERMIC & ENDOTHERMIC REACTIONS
Exothermic process: a
change (e.g. a chemical
reaction) that releases
heat.
Burning fossil
fuels is an
exothermic
reaction