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5 Written questions

5 Matching questions

  1. acid
  2. isotope
  3. element
  4. macromolecule
  5. enzyme
  1. a two or more atoms of the same element having different numbers of neutrons.
  2. b protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
  3. c pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means
  4. d large molecule formed by joining smaller organic molecules together
  5. e substance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.

5 Multiple choice questions

  1. substance in which another substance is dissolved.
  2. homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).
  3. measure of the concentration of hydrogen ions (H+) in a solution.
  4. combination of two or more different substances in which each substance keeps its individual characteristics; can have a uniform composition (homogeneous) or have distinct areas of substances (heterogeneous).
  5. organic compound made of amino acids joined by peptide bonds; primary building block of organisms.

5 True/False questions

  1. catalystsubstance that speeds up a chemical reaction by reducing the activation energy.


  2. nucleotidea subunit of nucleic acid formed from a single sugar, a phosphate group, and a nitrogenous base.


  3. basesubstance that releases hydroxide ions (OH-) when dissolved in water; a basic solution has a pH greater than 7.


  4. compoundpure substance with unique properties; formed when two or more different elements combine.


  5. carbohydrateorganic compound containing carbon, hydrogen, and oxygen in a ratio of on oxygen and two hydrogen atoms for each carbon atom.


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