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Notes

. PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION. SPI 0807.9.3 Elements and Compounds. Notes. What Is An Element? a substance that CANNOT be broken down into a simpler substance by CHEMICAL means.

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  1. PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION SPI 0807.9.3 Elements and Compounds Notes • 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 3 Li Example: Lithium is an element. Here is one lithium atom Lithium 6.9

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

  3. SPI 0807.9.3 Elements and Compounds Notes • What Is a Compound? • …is a substance made up of atoms of two or more different elementsthat are chemically bonded via a chemical reaction. • COMPOUND EXAMPLES: • NaCl = (Table Salt) • CO2= (Carbon dioxide) • C6H12O6 = (Glucose) • Notice the elements that were • chemically bonded together to form the following compounds: SODIUM AND CHLORINE CARBON AND OXYGEN CARBON, HYDROGEN, & OXYGEN

  4. SPI 0807.9.3 Elements and Compounds Notes • 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: • H2O • This is the compound called water • C12H22O11 • This the compound called table sugar • CH3COOH • This is the compound called vinegar …is a compound for it has more than 1 capital letter …is a compound for it has more than 1 capital letter …is a compound for it has more than 1 capital letter

  5. Review Activity • 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! • Element

  6. Review Activity • 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! • Compound

  7. Review Activity • 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! • Element

  8. Review Activity • 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 • MgCl2 • (Magnesium Chloride) • Why?... has two atoms chemically bonded together • How to tell?...It has more than one capital letter! • Compound

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