Consider the reaction bf3 + nh3 → f3b―nh3
what changes in hybridization (if any) of the b atom are a result of this reaction?
a. before the reaction boron is sp2 hybridized, and after the reaction it is sp3d hybridized.
b. before the reaction boron is sp3 hybridized, and after the reaction it is sp3 hybridized.
c. before the reaction boron is sp2 hybridized, and after the reaction it is sp3 hybridized.
what changes in hybridization (if any) of the n atom are a result of this reaction?
a. before the reaction nitrogen is sp3 hybridized, and after the reaction it is sp2 hybridized.
b. before the reaction nitrogen is sp3 hybridized, and after the reaction it is sp3 hybridized.
c. before the reaction nitrogen is sp3d hybridized, and after the reaction it is sp3 hybridized.

The correct answer is given below

Explanation:

B before the reaction boron is sp2 hybridized and after the reaction boron is it is sp3 hybridized.

    Before the reaction boron is joined to 3 fluorine atoms by 3 covalent bonds between them one is s and rest of the 2 are p.That"s why before the reaction boron is sp2 hybridized.

   Whereas after the reaction boron is joined to 3 fluorine atoms by 3 covalent bonds and one nitrogen atom by one co ordinate bond.That"s why after reaction boron is sp3 hybridized.

B  before the reaction nitrogen is sp3 hybridized and after the reaction it is sp3 hybridized.

  Before the reaction Nitrogen is joined to 3 hydrogen atoms by 3 covalent bonds and contain one lone pair of electron.That"s why before the reaction Nitrogen atom is sp3 hybridized.

 whereas after the reaction Nitrogen is joined to 3 hydrogen atoms by 3 covalent bonds and with one boron atom by a co ordinate bond.That"s why after reaction Nitrogen atom is sp3 hybridized.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance