Quantities Concepts
13 concepts · Grades 6-8, 9-12 · 14 prerequisite connections
This family view narrows the full chemistry map to one connected cluster. Read it from left to right: earlier nodes support later ones, and dense middle sections usually mark the concepts that hold the largest share of future work together.
Use the graph to plan review, then use the full concept list below to open precise pages for definitions, examples, formulas, and related mistake guides. That combination keeps the page useful for both human study flow and crawlable internal linking.
Concept Dependency Graph
Concepts flow left to right, from foundational to advanced. Hover to highlight connections. Click any concept to learn more.
Connected Families
Quantities concepts have 6 connections to other families.
All Quantities Concepts
Mole
A counting unit for atoms and molecules, equal to $6.022 \times 10^{23}$ particles (atoms, molecules, or ions).
Avogadro's Number
The defined number of particles in exactly one mole of any substance: $6.022 \times 10^{23}$.
Molar Mass
The mass in grams of exactly one mole of a substance, calculated by summing the atomic masses of all atoms in the chemical formula. Molar mass is the essential conversion factor between measurable mass (grams) and countable quantity (moles).
Stoichiometry
The branch of chemistry that calculates the quantities of reactants and products in chemical reactions.
Limiting Reactant
The reactant that is completely consumed first in a reaction, determining the maximum product yield.
Theoretical Yield
The maximum amount of product that could form based on stoichiometry and the limiting reactant.
Percent Yield
The ratio of the actual yield obtained in an experiment to the theoretical yield predicted by stoichiometry, expressed as a percentage. It measures how efficient a chemical reaction was in practice.
Empirical Formula
The simplest whole-number ratio of atoms of each element present in a compound, found by reducing the actual atom counts.
Molecular Formula
The chemical formula showing the actual number of atoms of each element in one molecule of a compound, as opposed to the empirical formula which shows only the simplest ratio.
Percent Composition
The percentage by mass that each element contributes to the total molar mass of a compound, calculated by dividing the total mass of each element in one mole of the compound by the compound's molar mass and multiplying by 100.
Gas Laws
Mathematical relationships between pressure, volume, temperature, and amount of gas.
Atomic Mass
The weighted average mass of all naturally occurring isotopes of an element, in atomic mass units.
Grams (Mass)
Grams are the base unit of mass in the metric system, measuring the quantity of matter in a substance. In chemistry, grams are the measurable quantity on a balance, but must be converted to moles for stoichiometric calculations using molar mass.