Consider the combustion of ethylene, c2h4(g)+3o2(g)→2co2(g)+2h2o(g). if the concentration of c2h4 is decreasing at the rate of 3.8×10−2 m/s , what is the rate of change in the concentration of co2? express your answer using two significant figures. δ[co2]/δt δ [ c o 2 ] / δ t = nothing m/s

0.076 M/s

Explanation:

The rate of a reaction aA + bB → cC + dD can be calculated by:

r = -(1/a)x(Δ[A]/Δt) = -(1/b)x(Δ[B]/Δt) = (1/c)x(Δ[C]/Δt) = (1/d)x(Δ[D]/Δt)

The minus signal for the reactants is because they're disappearing, so Δ{A] and Δ[B] will be negative. So, for the same time, r is proportional to the coefficients:

r = (1/2) Δ[CO₂]/Δt

Δ[CO₂]/Δt = 2x3.8x10⁻²

Δ[CO₂]/Δt = 0.076 M/s

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e