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5 Written questions

5 Matching questions

  1. nucleus
  2. polar molecule
  3. reactant
  4. compound
  5. pH
  1. a substance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.
  2. b measure of the concentration of hydrogen ions (H+) in a solution.
  3. c center of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA
  4. d molecule with oppositely charged regions
  5. e pure substance with unique properties; formed when two or more different elements combine.

5 Multiple choice questions

  1. specific place where a substrate binds on an enzyme.
  2. type of chemical bond formed when atoms share electrons.
  3. substance formed by a chemical reaction; located on the right side of the arrow in a chemical equation.
  4. particle without a charge in an atom's nucleus
  5. compound whose atoms are held together by covalent bonds

5 True/False questions

  1. acidbuilding block of matter; contains subatomic particles—neutrons, protons, and electrons


  2. ionatom that is negatively or positively charged because it have lost or gained one or more electrons.


  3. ionic bondparticle without a charge in an atom's nucleus


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


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