CHEMISTRY DRILL III

                  PARTICULATE NATURE  OF MATTER 2

1.            The number of atoms in one mole of a substance is equal to?   (a) The Atomic number   (b) The Avogadro number

(c) The Gas constant    (d) The number of neutrons    (e) The number of electrons

2.       In an experiment, 5.00g of a metal gave 10.59g of its chloride. In another experiment, 1.50g of the same metal combined with 1.68g chlorine. The above data illustrates:  (a) Law of Conservation of mass  (b) The Law of Definite proportion   (c) The Law of Multiple proportion   (d) Gay Lussac’s law   (e) Avogadro’s law

3.        The mass of an atom is determined by:  (a) Its ionization potential   (b) Its electrochemical potential   (c) The number of protons and electrons   (d) The number of neutrons and protons    (e) The number of neutrons and electrons

4.       R U S T Y Which of the following statements is NOT true of the elements R, U, S, T, and Y?

(a) R is an isotope of hydrogen   (b) U and Y are isotopes   (c) R, U, S, and T are metals   (d) T is a noble gas   (e) S will react with oxygen to form SO

5.          An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is? (H = 1, C = 12, O = 16).   (a) C₈H₂₂O₃   (b) C₆H₁₀O₃     (c) C₁₂H₁₂O    (d) C₆H₁₂O   (e) C₈H₆O

6.        0.499g of CuSO₄ x H₂O when heated to constant weight gave a residue 0.346g. The value of x is? (Cu = 63.5, S = 32.0, O = 16, H =1)   (a) 0.5   (b) 2.0   (c) 3.0   (d) 4.0   (e) 5.0

7.       The number of atoms of chlorine present in 5.85g of NaCl is [Na = 23, Cl =35.5 Avogadro’s number = 6.02 x 10²³]v (a) 6.02 x 10²²   (b) 5.85 x 10²³   (c) 6.02 x 10²³    (d) 5.85 x 10²⁴

8.         An isotope has an atomic number of 17 and a mass number 36. Which of the following gives the correct number of neutrons and protons in atom of the isotope?

            Neutrons                               Protons

(a)                  53                                            17

(b)                  17                                            36

(c)                  19                                            17

(d)                  36                                            17

9.       The atomic numbers of two elements X and Y are 12 and 9 respectively. The bond in the compound formed between the atoms of these two elements is?   (a) Ionic   (b) Covalent   (c) Neutral    (d) Co-ordinate

10.      A metallic ion X²⁺ with an inert gas structure contains 18 electrons. How many protons are there in this ion?

(a) 20   (b) 18   (c) 16   (d) 2