Chemistry, 07.03.2020 05:07 coreyslotte

Just as the depletion of stratospheric ozone today threatens life on Earth today, its accumulation was one of the crucial processes that allowed life to develop in prehistoric times.

3 O2 (g) ---> 2 O3 (g)

a. Express the rate of reaction in terms of the rate of disappearance of O2 and the rate of appearance of O3.
b. At a given instant, the rate of disappearance of O2 is 1.61 x10^-5 mol/Ls. What is the rate of appearance of O3?

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Answer from: jacobs5919

The rate of reaction :

$R\times 3=-\frac{d[O_2]}{dt}$

$R\times 2=\frac{d[O_3]}{dt}$

$1.073\times 10^{-5} mol/Ls$ is the rate of appearance of an ozone.

Explanation:

The rate of the reaction is defined as change in in the concentration of any one of the reactants or products per unit time.

$3O_2 (g)\rightarrow 2O_3 (g)$

a) Rate of the reaction = R

$R=\frac{-1}{3}\frac{d[O_2]}{dt}=\frac{1}{2}\frac{d[O_3]}{dt}$

Rate of the disappearance of the oxygen gas: $-\frac{d[O_2]}{dt}$

$R\times3=-\frac{d[O_2]}{dt}$

Rate of the appearance of the ozone gas: $\frac{d[O_3]}{dt}$

$R\times 2=\frac{d[O_3]}{dt}$

b)Rate of the disappearance of the oxygen gas: $-\frac{d[O_2]}{dt}=1.61\times 10^{-5} mol/L s$

$R\times3=-\frac{d[O_2]}{dt}$

$R=\frac{1.61\times 10^{-5} mol/L s}{3}=5.367\times 10^{-6} mol/L s$

Rate of the appearance of the ozone gas: $\frac{d[O_3]}{dt}$

$R\times 2=\frac{d[O_3]}{dt}$

$5.367\times 10^{-6} mol/L s\times 2=\frac{d[O_3]}{dt}$

$\frac{d[O_3]}{dt}=1.073\times 10^{-5} mol/Ls$

$1.073\times 10^{-5} mol/Ls$ is the rate of appearance of an ozone.

Answer from: Quest

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

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health implications of pesticides

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other important considerations

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Answer from: Quest

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