Methyl nitrate, CH3NO3，is used as a rocket propellant. The skeleton structure of the molecule is CH3ONO2: The N and three O atoms lie in the same plane, but the CH3 group is not in the same plane as the NO3group. The bond angle C-O-N is 105° and the bond angle O-N-O is 125°, One N-to-O bond length is 120pm and the other two are 136 pm each. a. Draw a Lewis structure of the molecule showing its geometrical shape.

b. Describe the bonding scheme and the probable atomic (including hybrid) orbitals
involved.
c. Explain why all three N-to-O bond lengths are not the same.
d. Is the specie a polar molecule? If so, show the direction of the net dipole.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.