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AP CHEMISTRY VIDEOS
Matter and Measurement
Atoms, Molecules and Ions
Stoichiometry- Calculations with Chemical Formulas and Equations
Aqueous Reactions and Solution Stoichiometry
Electronic Structure of Atoms
Periodic Properties of the Elements
Basic Concepts of Chemical Bonding
Molecular Geometry and Bonding
Intermolecular Forces, Liquids and Solids
Properties of Solutions
Additional Aspects of Equilibria
Law of Conservation of Mass, Law of Constant Composition, Law of Multiple Proportions
THE THREE LAWS
The Law of Conservation of Mass
: The mass of a closed system will stay constant over time, regardless of the processes occurring inside the system. Mass cannot be made or destroyed but, it can be rearranged and changed into different types of particles. For example, when water is created from hydrogen and oxygen, atoms of each element are not lost or created; just rearranged.
The Law of Constant Composition
: A compound always has the same proportion of elements by mass. In H2O, every compound has 2g of hydrogen and 16g of oxygen.
Space filling model of a water molecule
The Law of Multiple Proportions
: If two elements combine to form more than one compound, then the masses of the elements that combine are given in a small whole number ratio. The mass ratio of glucose is 6:12:6 or 1:2:1, which is equal to the ratio of the number of atoms in the compound.
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