11/12/08
Post date: Nov 12, 2008 12:52:36 AM
Bell Activity: With a partner, create an analogy to explain elements, compounds, and mixtures to present to the class
Chemical Formulas
"Recipe" for compounds
Tell how many of each type of atom to make a single molecule of a compound
Compounds have a set ratio of atom
Pure substances and mixtures
Elements and compounds are pure substances... all one type of atom or one type of molecule
Mixtures are not pure substances... multiple types of atoms and/or molecules
Mixtures can be homogeneous or heterogeneous
homogeneous - evenly mixed up, such as steak salt, tea, change in a piggy bank
heterogeneous - not mixed well, such as a salad, rocks and water, oil and water
Mixtures can be mixes of matter in different states
Gases and liquids, such as carbonated soda
Solids and liquids, such as salt and water
Solids and gases, such as Swiss cheese
Waves test due today
Page 50: 1-8 Due Tomorrow