Exam 2: Molecules

Draw the "best" Lewis structures of hydrogen azide,HN₁N₂N₃, and the azide ion,N₁N₂N₃^{-S1S1P.The subscripts are used for identification.For each,match the following bond lengths to the correct N-N bond.The bond lengths can be used more than once. - bond Bond length, pm hydrogen azide - 113 - 116 azide ion - 124 -}

Which of the following is paramagnetic?

Use the bond enthalpies given to estimate the heat released when ethene, CH₂=CH₂, Reacts with hydrogen to give CH₃CH₃.Bond enthalpies ( kJ.mol^-1 ): C-H,412; C-C,348; C=C,612; C-Br,276; H-H,436.

Which has the greater ionic character: H₂S or H₂O?

Which of the following has bond angles slightly less than 109 ^$\circ$ ?

What are the electron arrangements around the central atom and the shape, respectively, Of SF₄?

For dinitrogen monoxide, the arrangement of the atoms is N-N-O.In the Lewis structure with a single bond between NN and a triple bond between NO, The formal charges on N,N,And O,Respectively,Are

Which of the compounds below has bonds with the least covalent character?

The fact that B₂ has two unpaired electrons means the 2p _$\pi$ molecular orbitals have higher energy than the 2p _$\sigma$ molecular orbitals .

Which of the following is polar?

Predict the electronic configuration in the oxide ion in CaO.

Draw the Lewis structure of formamide, NH₂CHO,and give the number of lone pairs of electrons,and the number of $\sigma$ - and $\pi$ -bonds.

Which of the following species has two unpaired electrons?

Which of the following species has bonds with the most ionic character?

Metals rarely lose electrons in chemical reactions because

Use the bond enthalpies given to estimate the heat released when 1-bromobutene, CH₃CH₂CH=CH₂, Reacts with bromine to give CH₃CH₂CHBrCH₂Br. Bond enthalpies (kJ.mol^-1): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.

Write the formula of magnesium phosphide.

Predict the electron arrangement in ClF₃.

Name all the angles in a trigonal bipyramidal geometry.

Which of the compounds below has bonds with the most covalent character?