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5 Written questions

5 Matching questions

  1. Which elements are most common in the human body?
  2. How does the number of protons in a water molecule compare with the number of electrons?
  3. Explain the difference between saturated & unsaturated fats.
  4. What are the general difference between an organic molecule and an inorganic molecule?
  5. Distinguish between a molecule and a compound.
  1. a Carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus.
  2. b Molecule: two or more atoms may combine to form a distinctive type of particle.
    Compound: substance composed of two or more chemically bonded elements.
  3. c 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.
  4. d The number of protons equals the number of electrons.
  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. Because body functions result from cellular functions that in turn, result form chemical change
  2. Water
  3. 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.
  4. 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. DNA: molecules store the information for protein synthesis.
    RNA: molecules use this information to construct specific protein molecules.

5 True/False questions

  1. What is the relationship between matter and elements?All matter is composed of fundamental substances.


  2. Define electrolyte balance.Energy or atomic fragments they emit.


  3. Compare the characteristics of an acid, a base & a salt.Acid: substance that releases hydrogen ion
    Base: substance that release ions that can combine with hydrogen ions
    Salt: substance formed by the reaction between and acid and a base.


  4. List 3 main types of lipids found in cells.fats, phospholipids, and steroids.


  5. What is the difference between an electrolyte and a nonelectrolyte?Electrolyte: substance that ionizes in a water solution
    Nonelectrolyte: organic compounds that dissolve in water, usually do not release ions.


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