16. When electricity is passed through water, the following decomposition reaction can occur: 2H2O → 2H +02 What does the law of conservation of matter tell you about the ratios of particles in the chemical reaction? A The reacting substances must be the same as the substances produced. 8. The number of reactant molecules must equal the number of product molecules. The number of reactant compounds must equal the number of product compounds. D. The number of atoms of each element must be equal on both sides of the reaction arrow.

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

hi my dude or dudette