1. Chapter 7 Lesson 1

2.  What is it?  Anything that has mass and takes up space (volume)  How do you classify matter?  Would air, feelings, motion, time, or fire classify as matter?

3. If light, sound, force, and energy are not matter, how do we know anything about them?

4.  unique structure of atoms determines the properties of matter  http://app.discoveryeducation.com/search? Ntt=atoms+matter+ http://app.discoveryeducation.com/search? Ntt=atoms+matter

5.  combination of atoms that is always the same  sugar, aluminum, oxygen  If you have a glass of pure water from a spring in Canada and a glass of pure water from a pond in California, would the arrangement of water atoms in each glass be the same or different? Explain.

6.  a substance  consists of just one type of atom  115 known elements = 115 different types of atoms  Each type contains a different number of protons (atomic number)  most elements exist as individual atoms  some exist in groups (oxygen – pairs)  Still contains only one type of atom

7. Atoms with more than 92 protons in their nucleus aren’t stable, so scientists synthesize them artificially by colliding two atoms together. These super-large atoms break down extremely quickly.

8. Do you think most of the materials in the world are pure elements, or are they made up of a combination of elements?

9.  substance  two or more different elements  chemically bonded together  Carbon Dioxide CO 2  1 atom of carbon (C)  2 atoms of oxygen (O)  Carbon Monoxide: CO  1 atom of carbon  1 atom of oxygen

10.  What does a chemical formula, such as CO, show?  How do you know NaHCO 3 is a compound?  Are the properties of one compound always different from every other compound?

11.  Matter that can vary in composition  Two or more substances  Physically blended together  Beach: sand and water  Can be separated

12.  Heterogeneous Mixtures  Individual substances are not evenly mixed  Substances do not mix completely  Different samples of a mixture can contain different amounts of the same substances

13.  Homogeneous Mixtures  Individual substances are evenly mixed  Different samples of a mixture will have same combinations of same substances  Individual particles are not visible Small and well-mixed  Also known as a solution Solvent – largest amount Solutes – smaller amounts Solutes dissolve (mix evenly) in the solvent

14. How is a compound different from a solution? What is the chemical formula for salt water?