Chemistry Vocabulary: Molar Mass, Molecular Models, and Formulas

Vocabulary flashcards based on the introductory lecture covering basic chemical terminology, molecular models, molar concepts, and chemical formulas.

Structural Formula

A chemical representation that shows how the atoms are connected in a molecule.

Space-Filling Model

A molecular representation created by inflating atomic spheres until they touch.

Lewis Structure

A representation where two dots between two atoms denote a single bond, which can be replaced by a line to show connectivity.

Ball-and-Stick Model

A molecular model that utilizes spheres and connecting sticks to show the 3D geometry of a molecule.

Mole

The amount of a substance that contains the same number of entities as in $12\,g$ of carbon 12.

Molar Mass

The mass of one mole of a substance's entities, expressed in units of grams per mole.

Mass Fraction

A converted form of percentage to fraction used in mass ratios to find the mass of a specific element in a given sample.

Empirical Formula

A chemical formula expressing the smallest whole-number integer ratio of elements present in a compound.

Structural Isomers

Compounds, such as fructose and glucose, that possess the exact same molecular formula but feature different atomic structural arrangements.

Tetraphosphorus Trisulfide

A chemical compound comprised of four phosphorus atoms and three sulfur atoms ($P_4S_3$).