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5 Written questions

5 Matching questions

  1. solute
  2. carbohydrate
  3. catalyst
  4. solution
  5. molecule
  1. a organic compound containing carbon, hydrogen, and oxygen in a ratio of on oxygen and two hydrogen atoms for each carbon atom.
  2. b compound whose atoms are held together by covalent bonds
  3. c homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).
  4. d substance that speeds up a chemical reaction by reducing the activation energy.
  5. e substance dissolved in a solvent.

5 Multiple choice questions

  1. electrical attraction between two oppositely charged atoms or groups of atoms.
  2. pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means
  3. protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
  4. molecule with oppositely charged regions
  5. 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 True/False questions

  1. nucleotidecenter of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA


  2. compoundsubstance dissolved in a solvent.


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


  4. acidhydrophobic biological molecule composed mostly or carbon and hydrogen; fats, oils, and waxes are lipids


  5. buffermixture that can react with an acid or a base to maintain the pH within a specific range.


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