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5 Written Questions

5 Matching Questions

  1. Do Hydrogen Bonds only occur with water molecules?
  2. Define the potential energy level of electrons and the Kinetic energy level.
  3. What is a molecule?
  4. What bond do two oxygen's share?
  5. What are trace elements?
  1. a No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
  2. b Non-polar covalent bond; they have equal electronegativity so they share their e⁻
  3. c Potential energy - stored energy due to location or structure; ready to use energy
    Kinetic energy - energy in motion or movement; currently using
  4. d 2 or more atoms held together by covalent bonds
  5. e Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter

5 Multiple Choice Questions

  1. The sharing of electrons EQUALLY; atoms have similar electronegativities
  2. Polar covalent bond.
    (it's when there's more than one polar molecule that hydrogen bonding takes place)
  3. Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
  4. Protons - positive; in nucleus; 1 dalton (or amu)
    Neutrons - neutral; in nucleus; 1 dalton (or amu)
    Electrons - negative; found outside nucleus; 0 nothing
  5. Two or more atoms SHARING ELECTRONS.
    Single covalent bonds - sharing of one pair of valence electrons
    Double - sharing of two pairs of valence electrons

5 True/False Questions

  1. What is a compound?2 or more atoms held together by covalent bonds


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


  3. Difference between an element and a compound?Covalent bonds are the SHARING of electrons, whether it be equally or unequally
    Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING


  4. What are isotopes?Different forms of the same element; they differ in number of neutrons, but they have the same # of protons and behave identically in chemical reactions


  5. What is the atomic number?The number of protons and neutrons in nucleus.


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