1) Which of the following is most likely to be an ionic compound? A) CaCl 2 B) S
ID: 1008108 • Letter: 1
Question
1) Which of the following is most likely to be an ionic compound?
A) CaCl2
B) SO2
C) CO2
D) OF2
E) CS2
2) If a hydrogen tom and a helium atom are traveling at the same speed,
A) the wavelength of the hydrogen atom will be roughly equal to the wavelength of the helium atom
B) the wavelength of the helium atom will be about 2 times longer than the wavelength of the hydrogen atom
C) the wavelength of the helium atom will be about 4 times longer than the wavelength of the hydrogen atom
D) the wavelength of the hydrogen atom will be about 4 times longer than the wavelength of the helium atom
E) the wavelength of the hydrogen atom will be about 2 times longer than the wavelength of the helium
3) A molecule with two resonance structures is shiftin quickly back and forth from one structure to the other:
A) True
B) False
Explanation / Answer
Soln:
1. Ans; A) CaCl2 because chlorine is highly electronegative and form chloride ion and Calcium form Ca2+
2)E)the wavelength of the hydrogen atom will be about 2 times longer than the wavelength of the helium.
because
= h/(2Em)
So wavelength is inversely proportional to the sqrt of mass … mass of helium is higher than hydrogen..
3) false
Because a molecule with two resonance structure is do not shifting quickly back this is the condition
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