2009 compounds2


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2009 compounds2

  1. 1. Compounds
  2. 2. Objectives <ul><li>Define compound, molecule, chemical formula, diatomic molecule </li></ul><ul><li>Write and decipher a chemical formula </li></ul>
  3. 3. <ul><li>1. Elements with 7 valence electrons are </li></ul><ul><li>A. metalloids </li></ul><ul><li>B. noble gases </li></ul><ul><li>C. transition metals </li></ul><ul><li>D. halogens </li></ul>
  4. 4. <ul><li>2. The elements to the left of the zigzag line on the periodic table are </li></ul><ul><li>A. gases </li></ul><ul><li>B. metals </li></ul><ul><li>C. nonmetals </li></ul><ul><li>D. metalloids </li></ul>
  5. 5. <ul><li>3. A very stable electron arrangement of valence electrons is a characteristic of what chemical family? </li></ul><ul><li>A. alkali metal </li></ul><ul><li>B. halogen </li></ul><ul><li>C. noble gas </li></ul><ul><li>D. alkaline earth </li></ul>
  6. 6. <ul><li>4. Elements in groups 3 through 12 are called </li></ul><ul><li>A. halogens </li></ul><ul><li>B. noble gases </li></ul><ul><li>C. transition metals </li></ul><ul><li>D. alkali metals </li></ul>
  7. 7. <ul><li>Atoms combine together to form most of the substances we observe in the world around us. </li></ul><ul><li>Compounds - two or more atoms chemically joined together to form a new substance with very different properties than the elements of which it is formed. </li></ul>
  8. 8. + <ul><li>Sodium + Chlorine = Salt </li></ul>=
  9. 9. Molecule <ul><li>The smallest piece of a compound is that still has all of the properties of the compound. </li></ul>
  10. 10. <ul><li>Chemical Formulas: </li></ul><ul><li>The subscripts to the right of the letters tell you HOW MANY ATOMS of each element. If there isn’t one, it means that there is one atom of that element. </li></ul><ul><li>H 2 O </li></ul>
  11. 11. <ul><li>If there is a number in front of the formula, it tells you how many MOLECULES of that substance: </li></ul><ul><ul><li>4H 2 O </li></ul></ul><ul><li>This number is called the coefficient. </li></ul>
  12. 12. <ul><li>C 6 H 12 O 6 </li></ul><ul><li>3CO 2 </li></ul><ul><li>Ba(NO 3 ) 2 </li></ul>2Al 2 (SO 4 ) 3
  13. 13. diatomic molecule When an element consists of two identical atoms it is called DIATOMIC molecule. O 2 7 elements are always found as diatomic molecules - I odine, H ydrogen, N itrogen, B romine, O xygen, C hlorine, F luorine I H ave N o Br ight O r Cl ever F riends
  14. 15. <ul><li>1. Electrons in the outermost energy level are involved in the chemical combining of elements to form </li></ul><ul><li>A. acids </li></ul><ul><li>B. compounds </li></ul><ul><li>C. gases </li></ul><ul><li>D. metalloids </li></ul>
  15. 16. <ul><li>2. The groups of symbols that represent a compound is called a chemical </li></ul><ul><li>A. recipe </li></ul><ul><li>B. formula </li></ul><ul><li>C. function </li></ul><ul><li>D. combination </li></ul>
  16. 17. <ul><li>3. How many calcium atoms are present in Ca(ClO 3 ) 2 ? </li></ul><ul><li>A. 1 </li></ul><ul><li>B. 3 </li></ul><ul><li>C. 9 </li></ul><ul><li>D. 17 </li></ul>
  17. 18. <ul><li>4. In the formula 5 CaSO 4 , the total number of sulfur atoms present is </li></ul><ul><li>A. 1 </li></ul><ul><li>B. 5 </li></ul><ul><li>C. 9 </li></ul><ul><li>D. 20 </li></ul>
  18. 19. <ul><li>5. The ratio between the atoms that form a compound is indicated by the </li></ul><ul><li>A. coefficients </li></ul><ul><li>B. quotient </li></ul><ul><li>C. superscripts </li></ul><ul><li>D. subscripts </li></ul>