- Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.
- Each pure substance has characteristic physical properties (for any bulk quantity under given conditions) that can be used to identify it.
- Do Now- Get out your science notebook and Get out your science notebook and open to page 61. Read the Key Question on page 61 and the Procedure on the lab handout.
- Investigation- Do different amounts of water have the same density? Model procedure. Assign cooperative table group member responsibilities. Review science safety and complete lab safety checklist Before You Begin Questions 1-7. Begin lab!