Adsorption: Purifying Solutions and Gases
Understand how adsorption helps purify solutions and gases.
Physical and Chemical Changes: signs of a chemical reaction
Watch short examples, notice signs of chemical reaction, and learn how to tell physical changes from chemical ones.
All Simulations
Amino Acids and Proteins: how a protein molecule is built
Understand how amino acids join into proteins and why protein structure matters.
Ammonia Molecule (NH₃): shape, bonds, and polarity
Understand why ammonia has a trigonal pyramidal shape and why NH₃ is polar.