Question 3: Chemical Bonds (1 point) Match each chemical bond to its correct description. (1 point)

A. Ionic bond
___ Sharing of electrons
B. Covalent bond
___ Freely moving electrons
C. Metallic bond
___ Transfer of electrons

A) Ionic bond

___transfer of electrons

B) Covalent bond

___sharing of electrons

C) Metallic bond

___freely moving electrons

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

the answer for sodium is 0.186

the answer for rubidium is 0.251