1. 8 th Grade ScienceRSM Go to work station 1 or 2 and get the following items  One small dry-erase board  One dry-erase marker  A paper towel  Wait for further instructions To do: A) Celebrate birthdays B) Pick new team captains Feb 6, 2013

2. Notes SPI 0807.9.3 Elements and Compounds What Is An Element?  a substance that CANNOT be broken down into a simpler substance by CHEMICAL means.  In other words…you CANNOT change one element into a different element with a chemical reaction  Each individual element is a unique particle called an atom  So in other words… elements are the different types of atoms Example: Lithium is an element. Here is one lithium atom 3 Li Lithium 6.9

3. More About Elements:  Elements’ chemical symbols always start with one capital letter  Can be followed by one or more lower case letters Examples: H = the element hydrogen  represents one hydrogen atom Na = the element sodium  represents one sodium atom Uub=the element ununbium  represents one ununbium atom Notes SPI 0807.9.3 Elements and Compounds

4. What Is a Compound?  …is a substance made up of atoms of two or more different ELEMENTS that are CHEMICALLY combined via a chemical reaction.  EXAMPLES: NaCl = (Table Salt) CO 2 = (Carbon dioxide) C 6 H 12 O 6 = (Glucose) SODIUM AND CHLORINE CARBON AND OXYGEN Notes CARBON, HYDROGEN, & OXYGEN  Notice the elements that were chemically bonded together to form the following compounds: SPI 0807.9.3 Elements and Compounds

5. More About Compounds:  Formulas for compounds will always contain more than one capital letter.  This is how you can tell the difference between an element and a compound… count the number of capital letters! Examples: H2OH2O  This is the compound called water C 12 H 22 O 11  This the compound called table sugar CH 3 COOH  This is the compound called vinegar Notes …is a compound for it has more than 1 capital letter SPI 0807.9.3 Elements and Compounds

6. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound Cs (Cesium) Why?...is a pure substance, consists of only one type of atom How to tell?...It only has one capital letter! Review Activity Element

7. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound NaCl (Sodium Chloride) Why?... has two atoms chemically bonded together How to tell?...It has more than one capital letter! Review Activity Compound

8. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound Fe (Iron) Why?...is a pure substance, consists of only one type of atom How to tell?...It only has one capital letter! Review Activity Element

9. Is this an element or a compound? Write a capital E if you think it is an element Write a capital C if you think it is a compound MgCl 2 (Magnesium Chloride) Why?... has two atoms chemically bonded together How to tell?...It has more than one capital letter! Review Activity Compound