Endothermic & Exothermic Reactions definitions Flashcards

A process that absorbs thermal energy, causing molecules to speed up and break bonds, often feeling cold to the touch.

A process that releases thermal energy, causing molecules to slow down and form bonds, often feeling warm to the touch.

The energy absorbed or released during chemical reactions, affecting molecular motion and phase changes.

A transition between different states of matter, such as solid, liquid, and gas, influenced by thermal energy.

The process of a solid absorbing heat to become a liquid, also known as melting.

The process of a liquid absorbing heat to become a gas.

The transition of a solid directly into a gas without passing through the liquid phase.

The process of a gas releasing heat to become a liquid.

The process of a liquid releasing heat to become a solid.

The transition of a gas directly into a solid without passing through the liquid phase.

A graphical representation showing the energy changes during a chemical reaction.

A measure of heat change in a reaction, positive for endothermic and negative for exothermic processes.

The symbol representing the change in enthalpy during a chemical reaction.

The starting substances in a chemical reaction, typically at a higher energy level in exothermic reactions.

The substances formed in a chemical reaction, typically at a higher energy level in endothermic reactions.