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5 Written questions

5 Matching questions

  1. What are covalent bonds? Single? Double?
  2. What is a chemical bond?
  3. What is a hydrogen bond? Strong or weak?
  4. What are isotopes?
  5. Difference between an element and a compound?
  1. a Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
  2. b 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.
  3. c Atoms interacting with each other to share, take, or give electrons.
  4. d 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. e 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 Multiple choice questions

  1. Weak.
  2. Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
  3. Non-polar covalent bond; they have equal electronegativity so they share their e⁻
  4. Covalent bonds are the SHARING of electrons, whether it be equally or unequally
    Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
  5. The number of protons and neutrons in nucleus.

5 True/False questions

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


  2. Choose 2 elements essential to life, draw the electron configuration of each as an ion and note the charge of the ion.Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge


  3. What is matter?Atoms that lose or gain electrons to complete their outer shell


  4. What is a molecule?2 or more atoms held together by covalent bonds


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