flask General Chemistry
General chemistry introduces the core ideas that every other topic builds on: what matter is, how we measure it, the mole concept that links the atomic world to grams we can weigh, and how to describe and balance chemical reactions. Start here if you are new to chemistry.
What you will learn
- Describe matter and its properties
- Use significant figures and dimensional analysis
- Apply the mole concept and molar mass
- Balance chemical equations
- Solve basic stoichiometry problems
High School concepts
Balancing Chemical Equations Step by Step
A systematic method for balancing chemical equations: inspect, adjust coefficients, and verify atom counts.
Chemical Equations: Reading and Writing Them
How to read and write chemical equations: reactants, products, symbols, state labels, and conservation of mass.
Dimensional Analysis: The Factor-Label Method
The factor-label method for converting units reliably: set up conversion factors so unwanted units cancel.
Measurement and Significant Figures in Chemistry
How chemists measure, why every measurement has uncertainty, and the rules for significant figures in calculations.
Molar Mass: Computing and Using It
How to compute molar mass from atomic weights and use it to convert between grams and moles.
The Mole Concept and Avogadro's Number
Avogadro's number and the mole: chemistry's counting unit that bridges the atomic world and the laboratory balance.
Percent Composition of Compounds
Calculating the mass percentage of each element in a compound from its formula and molar mass.
Introduction to Stoichiometry and Mole Ratios
Using balanced equations and mole ratios to predict how much reactant is needed and how much product forms.
Beginner concepts
Matter and Its Properties Explained
What matter is, how its properties are classified, and how those properties let us identify and use materials.
Physical vs Chemical Changes: How to Tell Them Apart
How to tell physical changes from chemical changes using evidence, particle behavior, and chemical equations.
Formulas
Calculators
Practice
Balancing Chemical Equations Practice
8 problems · Practice balancing chemical equations: finding coefficients, checking atom conservation, and avoidin…
Mole Concept Practice
8 problems · Practice Avogadro's number, molar mass, and converting between grams, moles, and particles with step…
Stoichiometry Practice
8 problems · Practice mole ratios, limiting reactants, theoretical yield, and percent yield with fully worked sol…