Choose the correct answer(s) for each question.

1. The atomic number of an element specifies the number of...

   1.   ?    protons in atoms of the element.
   2.   ?    neutrons in atoms of the element.
   3.   ?    electrons in the outer orbit of atoms of the element.
   4.   ?    of isotopes that exist for the element.
   5.   ?    none of the other answers are corrrect.

2. The atomic mass of an element indicates the number of ...

   1.   ?    protons and neutrons in atoms of the element.
   2.   ?    proton in atoms of the element.
   3.   ?    neutrons in atoms of the element.
   4.   ?    electrons in atoms of the element.
   5.   ?    isotopes that exist for the element.

3. Isotopes are atoms of the same element with different numbers of ...

   1.   ?    neutrons.
   2.   ?    protons.
   3.   ?    electrons.
   4.   ?    atomic mass.
   5.   ?    none of the other answers are correct.

4. Elements with similar chemical properties are arranged in the periodic table in ...

   1.   ?    vertical groups or families.
   2.   ?    horizontal groups or families.
   3.   ?    vertical periods.
   4.   ?    horizontal periods.
   5.   ?    None of the other answers are correct

5. On the periodic table ...

   1.   ?    metals are located on the left side, non-metals on the right side.
   2.   ?    metals are located on the right side, non-metals on the left side.
   3.   ?    metals are located on the top, non-metals on the bottom.
   4.   ?    metals are located on the bottom, non-metals on the top.
   5.   ?    metals and non-metals have no special location on the periodic table

6. The smallest unit of matter that has the chemical propertes of any given element is ...

   1.   ?    the atom.
   2.   ?    a molecule.
   3.   ?    an isotope.
   4.   ?    the proton.
   5.   ?    the electron.

7. A molecule of ammonium hydroxide is composed of...

   1.   ?    7 atoms and three different elements.
   2.   ?    7 elements and three different atoms.
   3.   ?    4 atoms and three different elemnts.
   4.   ?    4 elements and three different atoms.
   5.   ?    None of the other answers are correct.

8. When magnesium metal reacts with hydrochloric acid (HCl) to produce magnesium chloride and hydrogen gas,...

   1.   ?    this is a single discplacement reaction.
   2.   ?    this is a double displacement reaction.
   3.   ?    this is a decomposition reaction.
   4.   ?    this is a synthesis reaction.
   5.   ?    this is a conversion reaction.

9. When hydrogen gas reacts with oxygen gas to produce water, a great deal of energy is released. Therefore this is ...

   1.   ?    an exothermic synthesis reaction.
   2.   ?    an exothermic decomposition reaction.
   3.   ?    an endothermic synthesis reaction.
   4.   ?    an endothermic decomposition reaction.
   5.   ?    None of the other answers are correct.

10. As the temperature of a solution increases, ...

    1.   ?    the solubility of solids increases and the solubility of gases decrease.
    2.   ?    the solubility of solids decreases and the solubility of gases increases.
    3.   ?    the solubility of both solids and gases increase.
    4.   ?    the solubility of both solids and gases decrease.
    5.   ?    there is no effect on the solubility of solids and gases.

11. The element Mercury is ...

    1.   ?    a liquid metal at room temperature
    2.   ?    a liquid non-metal at room temperature
    3.   ?    a solid metal at room temperature.
    4.   ?    a solid non-metal at room temperature.
    5.   ?    is a Noble gas at room temperature.

12. The transition metals ...

    1.   ?    include iron and copper
    2.   ?    include sodium and calcium
    3.   ?    are found in groups one and two of the periodic table.
    4.   ?    are found in groups seven and eight of the periodic table.
    5.   ?    are poor conductors of electricity and heat.