![]() ![]() They were previously called gas discharge tubes or Crookes tubes (named after William Crookes. First, he used a magnet and electrometer to observe that the cathode rays were indeed electrically charged. Nowadays, we use the name cathode ray tubes. ![]() If the total mass of electrons in 1 mole (6.022 x 1023) of atoms of a certain element is 30.17 mg, how many protons must there be in the nucleus of that atom? (mass of electron = 9.109 x 10-28 g). When an electric discharge is passed through this tube, a new type of rays is produced from the anode passing through the holes of positive cathode, they are. Thomson performed three experiments with cathode ray tubes. The oil drop experiment showed that the charge was quite small, which supported Thomson's favored explanation about the size of electrons. Thomson said that either these particles were very small or had a big charge. The cathode ray tube is a vacuum tube containing one or more electron guns and a fluorescent screen used to view images. In an atom of an element there are a fixed number of electrons. Cathode rays are essentially electrons given off when a metal is heated enough (thermionic emission). The activity sheet has embedded questions designed to promote small group discussions. ![]() You analyze samples of both solids to find the following masses of cobalt and chlorine (and no other elements): Mass Cobalt Mass Chlorine Bottle P Bottle Q 3.00 g 4.00 g 3.60 g 7.22 g If you assume that bottle P contains cobalt(II) chloride of formula CoCl2, use the law of multiple proportions to determine the value of x of the "cobalt chloride, CoCly” in bottle Q. The diagrams help students understand the significance of each experiment. In 1907, the Russian scientist Boris Rosing (who worked with Vladimir. The screen would emit a visible light when struck by a beam of electrons. Braun introduced a CRT with a fluorescent screen, known as the cathode ray oscilloscope. In a chemistry lab are 2 bottles (which we can designate P and Q), both labelled “cobalt chloride, CoClx” but the solids in the bottles have different colors. The first cathode ray tube scanning device was invented by the German scientist Karl Ferdinand Braun in 1897. If Thomson had determined the charge-to-mass ratio of the electron to be -2.76 x 1011 C/kg, and Millikan had determined the charge of the electron to be -3.20 x 10-19 C, what would the mass of the electron be in grams? Give your answer to 3 significant figures in scientific notation. cathode rays are negatively charged particles. First, he used a magnet and electrometer to observe that the cathode rays were indeed electrically charged. o the charge on each particle is a multiple of - 1.60 x 10-19 C. Thomson performed three experiments with cathode ray tubes. Transcribed image text: Thomson's experiments with a cathode ray tube demonstrated that: O cathode rays are attracted to the anode. ![]()
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