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5 Written questions

5 Matching questions

  1. What are valence electrons?
  2. What are non-polar covalent bonds?
  3. Difference between an element and a compound?
  4. What is a compound?
  5. What are our 6 Essential Elements?
  1. a a substance consisting of two or more different elements combined in a fixed ratio.
  2. b CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
  3. c A compound has characteristics different from those of its elements. Table salt, for example, is sodium chloride (NaCl), a compound composed of the elements sodium (Na) and chlorine (Cl) in a 1:1 ratio. Pure sodium is a metal, and pure chlorine is a poisonous gas. When chemically combined, however, sodium and chlorine form an edible compound.
  4. d The electrons on the outermost orbital shell
  5. e The sharing of electrons EQUALLY; atoms have similar electronegativities

5 Multiple choice questions

  1. Two or more atoms SHARING ELECTRONS.
    Single covalent bonds - sharing of one pair of valence electrons
    Double - sharing of two pairs of valence electrons
  2. Non-polar covalent bond; they have equal electronegativity so they share their e⁻
  3. Potential energy - stored energy due to location or structure; ready to use energy
    Kinetic energy - energy in motion or movement; currently using
  4. First shell - 2
    Second shell - 8
    Third shell - 8
  5. Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter

5 True/False questions

  1. What are ionic bonds?Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms


  2. Difference between compound and molecule?Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.


  3. What's a positive ion called? A negative ion?Positive ion = CATION
    Negative ion = ANION


  4. What bond does a SINGLE molecule of water have? (H₂O)Non-polar covalent bond; they have equal electronegativity so they share their e⁻


  5. Are Van der Waals interactions weak or strong?The electrons on the outermost orbital shell


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