Chem Vocab | Young Education

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E

Electron

The negatively charged particles that zip around the nucleus of an atom. They play a crucial role in chemical reactions and electricity.

Electron Shell

The energy levels where electrons orbit the nucleus of an atom. They are designated by numbers (e.g., 1, 2, 3) and can hold a specific number of electrons.

Endothermic Reaction

A chemical reaction that absorbs heat energy from its surroundings. During this reaction, the total energy of the products is higher than the total energy of the reactants, resulting in a net absorption of heat. These reactions often feel cool to the touch.

Exothermic Reaction

A chemical reaction that releases heat energy to its surroundings. During this reaction, the total energy of the products is lower than the total energy of the reactants, resulting in a net release of heat. These reactions often feel warm to the touch.