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5 Written questions

5 Matching questions

  1. pH
  2. Electrons
  3. Atomic Mass
  4. reactant
  5. radioactivity
  1. a a substance that takes part in and undergoes a chemical change during a reaction.
  2. b Negatively charged atomic particles.
  3. c The sum of the masses of all the protons and neutrons contained in an atoms nucleus.
  4. d Measures the relative concentration of hydrogen and hydroxyl ions in various solutions.
  5. e Process of spontaneous atomic decay.

5 Multiple choice questions

  1. the main building material of all cells.
  2. Substances that conduct an electrical current in solutions.
  3. A substance that can release hydrogen ions (H+) in detectable amounts. having a sour taste and can dissolve many metals of burn a hole in your rug. pH below 7
  4. nucleic acid found in all living cells:carries the organism's hereditary information.
  5. An atoms outermost electron shell.

5 True/False questions

  1. radioisotopesHeavier isotopes of certain atoms are unstable and tend to decompose to become more stable.


  2. EnergyThe ability to do work or to put matter into motion.


  3. MatterThe building blocks of elements.


  4. MoleculesWhen two or more atoms combine chemically.


  5. Hydrogen BondExtremely weak bonds formed when a hydrogen atom binds to one electron hungry nitrogen or oxygen atom is attracted to another electron hungry atom and a bridge if formed between them.


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