Chapter 16: Exothermic and Endothermic Reactions

Endothermic

________ if less heat energy is released in forming bonds in the products than is required in breaking bonds in the reactants.

Chemicals

________ store energy in their bonds.

overall net movement of energy

The ________ determines if the reaction is endothermic or exothermic.

Energy

________ is needed to break the bonds in the reactants to form their separate atoms.

new bonds

The newly separated atoms form ________ to make the products, and release energy to their surroundings.

endothermic reaction

A(n) ________ is one which takes in energy from the surroundings, this is shown by a fall in temperature.

Neutralisation reactions

________ are also exothermic.

Chemicals

________ store a certain amount of energy, and different chemicals store different amounts.

The overall amount of energy, however, doesn't change (if this is a closed system)

we know this is true, because energy cannot be created or destroyed

These are diagrams that show the relative energies of the reactants and products in a reaction

to show how energy changes over the course of a reaction

exothermic

thermodynamic process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light, electricity, or sound