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5 Written questions

5 Matching questions

  1. Define the potential energy level of electrons and the Kinetic energy level.
  2. How many electrons does it take to fill the first orbital shell? The second? The third?
  3. Difference between compound and molecule?
  4. Difference between an element and a compound?
  5. What is a hydrogen bond? Strong or weak?
  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 First shell - 2
    Second shell - 8
    Third shell - 8
  3. c Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
  4. d Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
  5. e Potential energy - stored energy due to location or structure; ready to use energy
    Kinetic energy - energy in motion or movement; currently using

5 Multiple choice questions

  1. The making and breaking of chemical bonds.
    1. Reactants - structure of chemicals prior to a chemical reaction
    2. Reaction
    3. Products - structure of chemicals as a result of a chemical reaction
  2. Two or more atoms SHARING ELECTRONS.
    Single covalent bonds - sharing of one pair of valence electrons
    Double - sharing of two pairs of valence electrons
  3. CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
  4. Polar covalent bond.
    (it's when there's more than one polar molecule that hydrogen bonding takes place)
  5. Atoms that lose or gain electrons to complete their outer shell

5 True/False questions

  1. Are Van der Waals interactions weak or strong?Weak.


  2. What is an element?Atoms that lose or gain electrons to complete their outer shell


  3. What are polar covalent bonds?The sharing of electrons UNEQUALLY; atoms have differing electronegativities


  4. What is the atomic number?The number of protons in an atom.


  5. Define Subatomic particles, their charges, where they're found, and their relative mass.Protons - positive; in nucleus; 1 dalton (or amu)
    Neutrons - neutral; in nucleus; 1 dalton (or amu)
    Electrons - negative; found outside nucleus; 0 nothing


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