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Atoms
• The basic component of all matter.
• The atom is the smallest particle of an element that has all of the chemical properties of that element.
• Atoms consist of a nucleus of protons and neutrons surrounded by electrons.
http://www.ktf-split.hr/glossary/image/atom.gif
Elements
• A substance consisting of a single type of atom.
• It cannot be broken down into different kinds of matter.
http://www.rentrain.com/resources/Helium%20Safety.jpg
http://www.reachoutmichigan.org/funexperiments/agesubject/lessons/
handouts/helium.GIF
Combinations of Elements:Mixtures
• A substance consisting of two or more substances mixed together.
• Mixtures can usually be separated by mechanical means.
• Two or more substances mixed together in such a way that each remains unchanged.
http://www.seelecttea.com/
Combinations of Elements:Compounds
• A substance formed from two or more elements, with a fixed ratio determining the composition.
• The elements lose their individual chemical properties and the compound has new properties.
http://www.awwu.biz
Molecules
• Compound of two or more atoms, the smallest unit of chemical compounds.
• The smallest particle of a substance that has all of the physical and chemical properties of that substance.
http://www.awwu.biz
Formulas
• The formula which identifies the atoms and the number of each kind in the molecules of a compound.
• The number and types of atoms in a molecule.
Glucose Glucose -C-C66HH1212OO66
Formulas:Subscripts
6C6C66HH1212OO66
# of atoms of each element in a molecule of the compound:
Carbon - 6
Hydrogen - 12
Oxygen - 6