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5 Written questions

5 Matching questions

  1. catalyst
  2. polar molecule
  3. acid
  4. chemical reaction
  5. carbohydrate
  1. a substance that speeds up a chemical reaction by reducing the activation energy.
  2. b molecule with oppositely charged regions
  3. c energy-requiring process by which atoms or groups of atoms in substances are changed into different substances
  4. d organic compound containing carbon, hydrogen, and oxygen in a ratio of on oxygen and two hydrogen atoms for each carbon atom.
  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. organic compound made of amino acids joined by peptide bonds; primary building block of organisms.
  2. 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).
  3. measure of the concentration of hydrogen ions (H+) in a solution.
  4. building block of matter; contains subatomic particles—neutrons, protons, and electrons
  5. reactant to which an enzyme binds

5 True/False questions

  1. solutesubstance dissolved in a solvent.

          

  2. lipidsubstance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.

          

  3. polymerprotein that speeds up a biological reaction by lowering the activation energy needed to start the reaction

          

  4. reactantsubstance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.

          

  5. moleculecompound whose atoms are held together by covalent bonds