一切有為法，如夢幻泡影，如露亦如電，應作如是觀。

90年上 周必泰 普通化學甲上期中考part C

11.Which reaction does not involve oxidation-reduction?

   a)CH4 + 3O2 → 2H2O + CO2

   b)Zn + 2HCl → ZnCl2 + H2

   c)2Na + 2H2O → 2NaOH + H2

   d)MnO2 + 4HCl → Cl2 + 2H2O + MnCl2

   e)All are osidation-reduction reactions

12.The father of modern chemistry

   a)Joseph Priestley

   b)Antoine Lavoisier

   c)John Dalton

   d)Louis Gay-Lussac

   e)Amedeo Avogadro

13.Which of the following is NOT the correct chemical formula for the compound

    named?

   a)hydrocyanic acid    HCN

   b)calcium sulfate     CaSO4

   c)beryllium oxide     BeO

   d)nickel(II) peroxide Ni2O

   e)ammonium chromate   (NH4)2CrO4

14,Which of the following statements is true?

   a)The oxidation number for H in LiAlH4 is -1

   b)The oxidation number of N in NO3 - is greater than that of S in SF6

   c)The relative ability of atoms to attract shared electron is on the order

     of F>O>N~Cl

   d)(Effusion rate for gas 1/Effusion rate for gas 2)=(√M1/√M2)

   e)None of the above

15.The kinetic molecular theory of gases does NOT assume that

   a)gases are made up of tiny particles in chaotic motion

   b)gas particles are very small compared to the average distance berween the

      particles

   c)gas particles collide with the walls of their container in elastic

     collisions

   d)The average velocity of gas particles is directly proportional to the

     absolute temperature

   e)The particles are assumed to exert no forces on each other

16.A sample of a xenon fluoride contains molecules of the form XeFn, where n

   is some whole number,  If 9.03×10^20 molecules of XeFn weigh 0.311g ,

   calculate n. (atomic mass,Xe=131, F=19)

   a)1

   b)2

   c)4

   d)none of these

17.Which of the experiments listed below did NOT provide the information

   stated about the nature of the atom?

   a)The Rutherford experiment proved the "plum-pudding" model of the atom was

      essentially correct.

   b)The Rutherford experiment proved the charge on the nucleus

   c)Millikan's oil-drop experiment showed that the charge on any particle was

      a simple multiple of the charge on the electron

   d)The electron discharge tube proved that electrons have a negative charge.

18.Caffeine consists of carbon hydrogen, oxygen, and nitrogen.  When 0.1920g

   of caffeine is burned in an excess of oxygen, 0.3482g of cargon dioxide and

     0.0891g water are formed.  Caffeine is 28.84% nitrogen by mass.  Its molar

    mass is between 190 and 200 g /mol.  What is formula for caffeine?

   a)C4H5N2O

   b)C3H2N2O2

   c)C6H4N4O4

   d)C8H10N4O2

   e)none of these

19.Which of the following statements about atomic structure is FALSE?

   a)The electrons occupy a very large volume compared to the nucleus

   b)Almost all of the mass of the atom is concentrated in the nucleus

   c)The protons and neutrons in the nucleus are very tightly packed

   d)The number of protons and neutrons is always the same in a neutral atom.

20.Which of the following statements is true?

   I.The number of protons is the same for all neutral atoms of an element

   II.The number of electrons is the same for all neutral atoms of an element

   III.The number of neutrons is the same for all neutral atoms of an element

   a)I,II,III, b)I,II, c)II,III, d)I,III

Ans:c a a或e e a dabda ebdad caddb