Download Work sheet –chapter 2 CLASS - XI CHEMISTRY (Structure of Atom

Work sheet –chapter 2
CLASS - XI CHEMISTRY (Structure of Atom)
1. Name the scientist who first gave the atomic model.
2. What is an isotope?
3. What are isobars?
4. What are isotones?
5. What is an atomic number?
6. What is a mass number?
7. Find out atomic number, mass number, number of electron and
neutron in an element
?
8. Give the main features of Thomson’s Model for an atom.
9. Give the drawbacks of J.J. Thomson’s experiment.
10. What did Rutherford conclude from the observations of ray
scattering experiment?
11. Why Rutherford’s model could not explain the stability of an atom?
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12. Give the range of wavelength of the visible spectrum.
13. State the two developments that led to the formation of Bohr’s model of atom.
14. What is an electromagnetic radiation?
15. Calculate the wavelength corresponding to a frequency of 98.8MHz.
16. Define black body radiation.
17. Define quantum.
18. Give the relation of energy (E) and frequency (v) as given by Planck.
19. Calculate the frequency and energy of a photon of radiation having
wavelength 3000 A
20. What did Planck’s theory explain?
21. On what frequency does the frequency from a black body depend?
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1.Define photoelectric effect.
2. How does the intensity of light effect photoelectrons?
3. What is threshold frequency?
4. Name the scientist who demonstrated photoelectric effect experiment.
5. What did Einstein explain about photoelectric effect?
6. What is the relation between kinetic energy and frequency of the
photoelectrons?
7. Calculate energy of 2mole of photons of radiation whose frequency
is 51014Hz.
8. What is emission and absorption spectra?
9. What transition in the hydrogen spectrum would have the same
wavelength as the Balmer transition, n = 4 to n = 2 of He+ spectrum?
10. Spectral lines are regarded as the finger prints of the elements. Why?
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1.States Heisenberg’s Uncertainty Principle.
2. Give the mathematical expression of uncertainty principle.
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3. How would the velocity be effected if the position is known?
4. We don’t see a car moving as a wave on the road why?
5. Give the de – Broglie’s relation.
6. Why cannot the motion of an electron around the nucleus be determined
accurately?
7. Calculate the uncertainty in the momentum of an electron if it is confined to a
linear region of length 110 .
8. Calculate the uncertainty in the velocity of a wagon of mass 4000kg whose
position is known accurately of 10m
9. What is the physical significance of  up?
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