The lewis structure for carbon hydrogen cyanide (hcn) is given. what is the three-dimensional shape of the molecule? a. bent b. linear c. tetrahedral d. trigonal planar

In HCN, the valence electron configuration of H = 1s¹

C = 2s²2p²

N = 2s²2p³

Thus, in HCN, C is the central atom which is bonded to H through a single bond and to N through a triple bond. In addition, there is a lone pair of electron on N atom. The 3 atoms lie in a straight line with a bond angle of 180⁰

Hence, the 3D shape of HCN is linear

Ans. B) Linear

B is the answer

The correct answer

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j