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Ib Chem Topic 2

In: Social Issues

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IB Chemistry – SL
Topic 2 Questions
1. Consider the composition of the species W, X, Y and Z below. Which species is an anion?
Species|Number of protons|Number of neutrons|Number of electrons|
A. W
B. X
C. Y
D. Z
(Total 1 mark)
2. Energy levels for an electron in a hydrogen atom are
A. evenly spaced.
B. farther apart near the nucleus.
C. closer together near the nucleus.
D. arranged randomly.
(Total 1 mark)
3. Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens?
I. Group number
II. Period number
A. I only
B. II only
C. Both I and II
D. Neither I nor II
(Total 1 mark)

4. How do bond length and bond strength change as the number of bonds between two atoms increases?
|Bond length|Bond strength|
(Total 1 mark)
5. Which of the following is true for CO2?
|CO bond|CO2 molecule|
(Total 1 mark)
6. The molar masses of C2H6, CH3OH and CH3F are very similar. How do their boiling points compare?
A. C2H6 < CH3OH < CH3F
B. CH3F < CH3OH < C2H6
C. CH3OH < CH3F < C2H6
D. C2H6 < CH3F < CH3OH
(Total 1 mark)
7. What is the correct number of each particle in a fluoride ion, 19F–?
(Total 1 mark)
8. Which statement is correct for the emission spectrum of the hydrogen atom?
A. The lines converge at lower energies.
B. The lines are produced when electrons move from lower to higher energy levels.
C. The lines in the visible region involve electron transitions into the energy level closest to the nucleus. D. The line corresponding to the greatest emission of…...

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