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5 Written questions

5 Matching questions

  1. What are isotopes?
  2. Are Van der Waals interactions weak or strong?
  3. What is a molecule?
  4. What is electronegativity?
  5. What are ionic bonds?
  1. a Weak.
  2. b 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
  3. c One atom's attraction of the electrons within one covalently bonded molecule
    O > N > C > H
    Oxygen - most electronegative element
  4. d 2 or more atoms held together by covalent bonds
  5. e Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms

5 Multiple choice questions

  1. Polar covalent bond.
    (it's when there's more than one polar molecule that hydrogen bonding takes place)
  2. A substance that cannot be broken down to other substances by chemical reactions.
  3. The number of protons and neutrons in nucleus.
  4. CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
  5. Non-polar covalent bond; they have equal electronegativity so they share their e⁻

5 True/False questions

  1. 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.


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


  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 valence electrons?The electrons on the outermost orbital shell


  5. Do Hydrogen Bonds only occur with water molecules?No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.