1. TOC: Compounds

2. I: Starter Before starting the problems, get two mini-grids and glue/tape them into your journal. Be sure and grid your answers on them. Write down the problems and solve them. #1 --- A marble with a mass of 7 grams is dropped into a graduated cylinder which is already filled with 40 mL of water. The water rises to 50 mL. What is the density of the marble? #2 --- A cube with a side length of 5 cm has a mass of 125 grams. What is its density. GRID BOTH ANSWERS!!!!!!!!!

3. II: Practice What is a Compound??

4. Look at the 2 beakers and write down 2-3 observations. Even though the 2 substances look the same, they have very different properties. The substance in beaker “X” is drinkable. The substance in “Y” is not and in its pure form could be fatal!! Both substances may be used to clean wounds but one is more effective than the other.

5. Look at these 2 chemical formulas. H2OH2OH2O2H2O2 What is the difference in the chemical symbols for these two substances? How many elements are in each formula? water Hydrogen peroxide

6. A compound is made from 2 or more elements that are chemically combined and is not separated by physical means into other substances. A compound has different properties than the original elements that formed it. Na is sodium which is a metal that explodes in water. Cl is chlorine which is a toxic gas. When they combine (NaCl) they make table salt!

7. A chemical formula is a combination of chemical symbols showing the atoms of which a substance is made and their proportions. C 6 H 12 O 6 This is called a subscript!! It shows how many atoms are present in the formula!

8. A molecule is the smallest particle of a compound that can exist on its own and keep its properties.

9. III: Application: Copy chart in your journal

10. III: Application: Identify the elements in the last column

11. III: Application: Match the name with the correct formula in the first column