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5 Written Questions

5 Matching Questions

  1. Difference between an element and a compound?
  2. How many electrons does it take to fill the first orbital shell? The second? The third?
  3. What are polar covalent bonds?
  4. What are valence electrons?
  5. What is the atomic mass?
  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 The electrons on the outermost orbital shell
  3. c The sharing of electrons UNEQUALLY; atoms have differing electronegativities
  4. d The number of protons and neutrons in nucleus.
  5. e First shell - 2
    Second shell - 8
    Third shell - 8

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. Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
  3. 2 or more atoms held together by covalent bonds
  4. Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
  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 hydrogen bond? Strong or weak?Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.

          

  2. What are the two strong chemical bonds?Atoms interacting with each other to share, take, or give electrons.

          

  3. 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

          

  4. Do Hydrogen Bonds only occur with water molecules?Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.

          

  5. What are ionic bonds?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

          

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