Which statement compares the attractive forces that hold particles together? A. Covalent bonding and Van der Waals forces join molecules together; ionic and hydrogen bonding produce compounds.
B. Metallic bonds and Van der Waals forces are weakly attractive; covalent and hydrogen bonds are strongly attractive.
C. Metallic and covalent bonds are strongly attractive; hydrogen bonding and Van der Waals forces are weakly attractive.
D. Metallic and covalent bonds are weakly attractive; hydrogen bonding and Van der Waals forces are strongly attractive.
Answer is C- Just got it right

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

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2