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5 Written questions

5 Matching questions

  1. Are Van der Waals interactions weak or strong?
  2. What is an element?
  3. What is matter?
  4. Difference between an element and a compound?
  5. What is a compound?
  1. a 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.
  2. b Anything that takes up space and has mass. Ex: Air; something that isn't matter: light (think of the filling up a balloon metaphor)
  3. c a substance consisting of two or more different elements combined in a fixed ratio.
  4. d Weak.
  5. e A substance that cannot be broken down to other substances by chemical reactions.

5 Multiple choice questions

  1. The number of protons and neutrons in nucleus.
  2. The sharing of electrons UNEQUALLY; atoms have differing electronegativities
  3. Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
  4. The sharing of electrons EQUALLY; atoms have similar electronegativities
  5. Non-polar covalent bond; they have equal electronegativity so they share their e⁻

5 True/False questions

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


  2. Define the potential energy level of electrons and the Kinetic energy level.Potential energy - stored energy due to location or structure; ready to use energy
    Kinetic energy - energy in motion or movement; currently using


  3. What are covalent bonds? Single? Double?Two or more atoms SHARING ELECTRONS.
    Single covalent bonds - sharing of one pair of valence electrons
    Double - sharing of two pairs of valence electrons


  4. What are valence electrons?Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter


  5. What are isotopes?Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms


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