Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. she has begun studying the materials used to fill walls. she knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water. which is most likely a molecule in a wall-filling material?

Answer : Option A) Benzene

Explanation : Benzene is organic in nature and cannot dissolve in water. Benzene also acts as an thermal insulator because it has delocalized electrons which cannot move its electrons to conduct heat and electricity. Therefore, it is used in wall filler to maintain the temperature inside the room.

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