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5 Written questions

5 Matching questions

  1. What are the general difference between an organic molecule and an inorganic molecule?
  2. Describe two ways that atoms may combine with other atoms.
  3. Explain how electrons are distributed within the electron shell of atoms.
  4. Identify the 4 levels of protein structure.
  5. Distinguish between an ion and a polar molecule.
  1. a Primary, Secondary, Tertiary, Quaternary
  2. b Ions: atom or molecule with an electrical charge.
    Polar: molecule in which the electrons and protons are not distributed symmetrically.
  3. c Each electron shell can hold a limited # of electrons. The maximum number of electrons that each of the 1st three shells can hold for elements of atomic number 18 and under is ...1st shell ( close to the nucleus) 2 e-, second shell 8 e-, third shell 8 e-. More complex atoms may have as many as 18 e- in the 3rd shell.
  4. d Two atoms of hydrogen can combine with one atom of oxygen to produce a molecule of the compound water.
    Atoms of the same element combine, they produce molecules of that element.
  5. e Organic: compounds have carbon and hydrogen.
    Inorganic: all other chemicals, chemicals that does not include both carbon and hydrogen atoms.

5 Multiple choice questions

  1. Molecular: consists of the symbols of the elements in the molecule with numerical subscripts that indicate how many atoms of each element are present.
    Structural: representation of the way atoms bond in a molecule.
  2. Carbohydrates: C, H, O
    Lipids: C, H, O (often P)
    Protein: C, H, O, N, ( often S)
    Nucleic acids: C, H, O , N , P
  3. Atoms that have the same atomic number but different atomic weight.
  4. Electrolyte: substance that ionizes in a water solution
    Nonelectrolyte: organic compounds that dissolve in water, usually do not release ions.
  5. Simple: sugars include monosaccharaides, disaccharides; straight chains or rings.
    Complex: polysaccharides are built of simple carbohydrates made of many bonded glucose molecules chains of sugars, cant digest.

5 True/False questions

  1. What is an Ion?Atoms that have the same atomic number but different atomic weight.


  2. Explain the difference between saturated & unsaturated fats.Saturated: single carbon-carbon bond link all the carbon atoms; each carbon atom binds as many hydrogen atoms as possible & is thus saturated with hydrogen atoms.
    Unsaturated: have one or more double bond between carbon atoms. Fatty acids with one double bond.


  3. How does the number of protons in a water molecule compare with the number of electrons?the nucleus of an atom.


  4. How does the hydrogen ion concentration compare between a solution of pH 6.4 and a solution of pH 8.42.The solution at pH 6.4 has 100 times the hydrogen ion concentration of a solution at pH 8.42.


  5. Explain why some atoms are chemically inert.Synthesis: when 2 or more atoms, ions, or molecules bond to form a more complex structure A+B->AB
    Decomposition: bonds of a reactant molecule break to form simpler molecules, atoms, or ions AB->A+B
    Exchange: parts of 2 different types of molecular trade positions as bonds are broken and new are formed AB + CD-> AD+ BC
    Reversible: product or products can change back to reactant or reactants A+B<-> AB


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