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
Notes SPI 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
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 Elements and Compounds
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 Elements and Compounds
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 Elements and Compounds
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
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
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
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