Chemistry
High School (11–12)
Atoms and Molecules › Stoichiometry and ConcentrationAtoms and Molecules › Measurement, Units and Significant FiguresAtoms and Molecules › Laws of Chemical CombinationAtoms and Molecules › The Mole ConceptAtoms and Molecules › Molecules, Ions and FormulaeMixtures and Solutions › Elements, Compounds and ChangesChapter 1Contains Standard contentSome Basic Concepts of Chemistry
How many molecules are in a sip of water? How much oxygen does a gas burner need? Chemistry answers such questions by counting particles in a clever way, with the mole. In this chapter you learn to measure carefully and to report a measurement honestly, meet the laws that led to the idea of atoms, and then use moles to find formulas, to work out the amounts in a reaction and to make solutions of a given strength. Python does the long arithmetic, so you can think about the chemistry.
Part of Chemistry · High School (11–12) (chapter 1)
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Matter and Measurement
Sort matter into elements, compounds and mixtures, and measure it in SI units. Learn to write numbers in scientific notation, to keep the right significant figures, and to change units without mistakes.
Laws, Atoms and the Mole
Five laws of chemical combination led Dalton to the atom. Use them, find atomic and molecular masses, and meet the mole: the chemist's way of counting particles by weighing them.
More onAtoms and Molecules › Stoichiometry and ConcentrationAtoms and Molecules › Measurement, Units and Significant FiguresAtoms and Molecules › Laws of Chemical CombinationAtoms and Molecules › The Mole ConceptAtoms and Molecules › Molecules, Ions and FormulaeMixtures and Solutions › Elements, Compounds and Changes