CHEMISTRY DRILL 2

      We normally define matter as anything that has weight and occupies space. in other words matter is simply everything we can see (this definition is okay for this level). In this drill we test  a basic understanding of the intricacies of matter, the constituents of different types of matter and how they interact to produce the various properties we see.

                                                                                                                                                                                                              

   1.          The nucleus of an atom contains (a) Protons only (b) Neutrons only (c) Protons and electrons        (d)  Neutrons and electrons (e) Protons and neutrons

  2.      Five atoms, T, W, X, Y, Z, consist of the following particles:

                                         T             W            X             Y             Z

          Proton                     13            16            17            19           20

         Electron                    13            16            17            19           20

        Neutron                      14            16            35            20           20

          Which of the five atoms can be described by the following properties: Relative atomic mass is            greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in                    solution.

           (a) T (b) W (c) X (d) Y (e) Z

3.    An element X forms the following compounds with Chlorine: XCl₄, XCl₃, XCl₂. This illustrates the (a) Law of multiple proportions (b) Law of chemical proportions (c) Law of simple proportions (d) Law of conservation of mass (e) Law of definite proportions.

4.    Which of the following statements is true when the potassium atom forms its ion? (a) It gains one electron and become neutral (b) Its atomic number decreases (c) It achieves electronic configuration of argon (d) It loses one proton (e) It loses one neutron.

5.   The empirical formula of an oxide of nitrogen containing 30.4% of nitrogen is (N=14.0, O=16.0). (a) N₂O₂ (b) NO (c) NO₂ (d) N₂O (e) N₂O₃

6.     A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide? (Hg = 200, O = 16) (a) Hg₂O (b) HgO₂ (c) HgO₄ (d) HgO (e) None of the above

7.     On heating under suitable conditions, 1 litre of a monoatomic gas X combines with 1½ litres of oxygen to form an oxide. What is the formula of the oxide? (a) XO₃ (b) X₂O₃ (c) X₃O₂ (d) XO₂ (e) None of the above

8.     An element X has 127 neutrons and 82 electrons. Its atomic number is? (a) 209 (b) 105 (c) 45 (d) 82 (e) 127

9.    The mass number of an atom is (a) The number of electrons in the atom (b) The number of protons in the nucleus of the atom (c) The number of neutrons in the nucleus of the atom (d) The sum of numbers of electrons and protons in the atom (e) The sum of numbers of protons and neutrons in the nucleus of the atom

10.   In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

    (a)     One atom of H₂ reacts with two atoms of O₂ to give one molecule of H₂O   

    (b)    Two atoms of H₂ react with two atoms of O₂ to give two molecules of H₂O

   (c)    One molecule of O₂ reacts with one molecule of H₂ to give 2 molecules of H₂O 

    (d)    One molecule of H₂ reacts with 2 molecules of O₂ to give 3 molecules of H₂O

  (e)    One molecule of O₂ reacts with 2 molecules of H₂ to give 2 molecules of H₂O