Chem

• Substance


  Contains one type of atom
• Element


  Substance that contains one type of atom
• Atom


  Smallest particles of a chemical element that can exist
• Compound


  Substance made up of two or more types of atom
• Mixture


  Contains different substances that are not chemically joined
• Elements


  • Other
• Compounds


  • Polymer
• Mixtures


  • Molecules
• Polymer


  Made by chemical reactions that join lots of small molecules together to make a very long molecule that is made from identical repeated groups of atoms
• Synthetic Polymers


  • Silk
  • DNA
  • Nylon
  • Plastic
  • Latex
  • Polyester
  • Rubber
• Plastics are synthetic materials derived from organic (carbon-containing) compounds
• Physical Properties


  Features of a material that you can observe without changing the substance
• Elements in the same group display the same chemical properties, they react in the same way
• The Elements of Group 1 (Alkali Metals)


  • Lithium-Li
  • Sodium-Na
  • Potassium-K
  • Rubidium-Rb
  • Caesium-Cs
  • Francium-Fr
• Alkali Metals


  As we go down, the metals are more reactive and easier to cut
• Alkali metal + Water


  Metal Hydroxide + Hydrogen
• The Elements of Group 7 (Halogens)


  • Fluorine-F
  • Chlorine-Cl
  • Bromine-Br
  • Iodine-I
  • Astatine-At
• Halogens


  As you go down the group 7, the less reactive the metal is
• Metalloids have properties that fall between those of metals and non-metals.
• Periods or rows contain elements with increasing atomic numbers and increasing mass.
• The periodic table is an arrangement of the elements according to their atomic number.