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5 Written questions

5 Matching questions

  1. Difference between an element and a compound?
  2. What are trace elements?
  3. What are our 6 Essential Elements?
  4. What is a compound?
  5. What are the two strong chemical bonds?
  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 a substance consisting of two or more different elements combined in a fixed ratio.
  3. c Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
  4. d Covalent bonds (STRONGEST) and Ionic bonds.
  5. e CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur

5 Multiple choice questions

  1. Positive ion = CATION
    Negative ion = ANION
  2. Covalent bonds are the SHARING of electrons, whether it be equally or unequally
    Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
  3. First shell - 2
    Second shell - 8
    Third shell - 8
  4. 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. The number of protons and neutrons in nucleus.

5 True/False questions

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


  2. What bond do two oxygen's share?Non-polar covalent bond; they have equal electronegativity so they share their e⁻


  3. What is an ion?A substance that cannot be broken down to other substances by chemical reactions.


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


  5. 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.


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