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5 Written questions

5 Matching questions

  1. What is the atomic number?
  2. What are trace elements?
  3. What are our 6 Essential Elements?
  4. What is a chemical reaction? Be able to identify the products and reactants in a chemical reaction.
  5. What are valence electrons?
  1. a 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. b The electrons on the outermost orbital shell
  3. c CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
  4. d The number of protons in an atom.
  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. No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
  2. 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. Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
  4. Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
  5. Polar covalent bond.
    (it's when there's more than one polar molecule that hydrogen bonding takes place)

5 True/False questions

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


  2. What is a hydrogen bond? Strong or weak?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. What is an element?Atoms that lose or gain electrons to complete their outer shell


  4. Difference between covalent and ionic bonds?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. What are isotopes?Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms