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5 Written questions

5 Matching questions

  1. isotope
  2. reactant
  3. atom
  4. covalent bond
  5. ionic bond
  1. a type of chemical bond formed when atoms share electrons.
  2. b substance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.
  3. c building block of matter; contains subatomic particles—neutrons, protons, and electrons
  4. d two or more atoms of the same element having different numbers of neutrons.
  5. e electrical attraction between two oppositely charged atoms or groups of atoms.

5 Multiple choice questions

  1. hydrophobic biological molecule composed mostly or carbon and hydrogen; fats, oils, and waxes are lipids
  2. specific place where a substrate binds on an enzyme.
  3. substance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.
  4. molecule with oppositely charged regions
  5. substance that speeds up a chemical reaction by reducing the activation energy.

5 True/False questions

  1. enzymelarge molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.


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


  3. solutionhomogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).


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


  5. macromoleculecompound whose atoms are held together by covalent bonds


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