1. what is the source of cathod rays?
2. why dalton atomic theory failed?
3. what is the charge to the mass ratio of electron?
4. How we can determine charge to the mass ratio of electron?
5. what are the characteristics of cathod rays?
6. why charge to the mass ratio of cathod rays is indipendent on the nature of the gas and the electrods?
11 class chemistry
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Answers
Answer:
1) alpha ray s source of cathode.
2)Dalton theory failed because it failed to explain the existence of allotropes.
Answer:
1.Cathode rays are originating from cathode as cathode is negatively charged. These rays then hit the gas sample inside the tube and ionize it. The electrons ejected from the ionisation of the gas travel towards anode. These rays are actually electrons produced from the ionisation of the gas inside the tube.
2.The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects. ... These atoms are known as isobars.
3.In rare occasions the thomson has been used as its unit in the field of mass spectrometry. Some disciplines use the charge-to-mass ratio (Q/m) instead, which is the multiplicative inverse of the mass-to-charge ratio. The CODATA recommended value for an electron is Qm = −1.75882001076(53)×1011 C⋅kg−1.
SI unit: kg/C
In SI base units: kg⋅A-1⋅s-1
Common symbols: m/Q
4.The electron charge-to-mass ratio was measured by accelerating the electrons through a voltage Vx towards a positively charged plate.
5.Some properties of cathode rays:
They travel linearly.
They have a negative electric charge.
They have particle property.
Magnets can deflect them.
Charge/mass ratio of the rays is constant.
They travel from the cathode to the anode.
Their properties are independent from the electrodes and gas present in the cathode ray tube.
6.The e/m ratio for cathode rays is constant. ... It is independent of the nature of gas in discharge tube and nature of cathode or electrodes of tube. This shows that an electron is a universal fundamental particle.