Homework Lecture 1

•The cathode rays consists of a very fine particles called……..

•The first scientist who defined the atom is …….

•Matter is composed of four components (water, air, dust and fire)

 

•The opposite figure represents one of the postulates of an atomic theory you have studied, what is
the name of this theory ?

•One of the following facts does not match Dalton’s atomic model

•which of the following examples agrees with Dalton’s postulates ?

•Each of the following is among Dalton’s theory postulates except that

•who is the scientist who did not presume that matter is formed of atoms ?

•particle like character of cathode rays is indicated by

•When the potential difference between the two electrodes of a discharge tube reaches around 10000 volts, it is noticed that

•Electrical neutrality was first mentioned in

•Dalton and Thomson agreed on that carbon atom

•48 g of oxygen react completely with 32 g of Sulphur to form 80 g of Sulphur trioxide what is the mass which remains in the container after the end of the reaction, produced from adding 100 g of oxygen to 16 g of Sulphur in suitable conditions for the reaction ? …….

•What is the mass ratio of carbon [C = 12] to hydrogen [H = 1] in methane CH4 ?

•The ratio of the number of hydrogen atoms to that of nitrogen atoms in ammonia molecule is 3:1. this is consistent with one of the postulates of …………… theory.

•Cathode rays have …….

•All of the following are among the properties of the cathode rays, except being …

•in electric discharging experiments through gases, cathode rays are deflected away from the metal plate which is negatively charged, because they are  ……..

•The apparatus which is illustrated in the opposite figure does not produce cathode rays what is the modification which should be considered to obtain the rays ?

•Which of the following ideas was not supported by Dalton’s solid sphere model of the atom?

•Who first postulated the solid-sphere model of the atom?

•What experiment explained the existence of the tiny, negatively charged electrons? Who performed this experiment?

•Who first discovered electrons?