AP Chemistry Directions
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Spectrum A
Spectrum B
7
100
80
100
80
60
40
2011
60
40
20
0
Which of the spectra shown could represent the isotopic composition of an
unknown element that has an average atomic mass of 25.5 amu?
0
22 23 24 25 26 27
22 23 24 25 26 27
A Spectrum A
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Spectrum C
100-
80
® Spectrum B
60
Spectrum D
100
80
60
40
20
01
22 23 24 25 26 27
© Spectrum C
40
20
0
II
22 23 24 25 26 27
D Spectrum D
Atomic Mass (amu)
Atomic Mass (amu)

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be