(Originais Teachy 2023) - Question Medium of Chemistry

In line with what is mentioned in text I, also from the perspective of thermodynamics, non-spontaneous work must be done to combat disorder. Chemical systems that exploit oxidation-reduction reactions can perform spontaneous or non-spontaneous work. Regarding chemical reactions in batteries and in electrolysis processes of aqueous solutions and molten compounds, choose the correct alternative.

A chemical reaction A + 2B -> C + D occurs in a system where the initial concentrations of A and B are, respectively, 0.1 mol/L and 0.2 mol/L. After a period of time, the concentration of A decreased to 0.05 mol/L. Considering that the reaction is first order with respect to A and second order with respect to B, determine the overall order of the reaction and explain how you reached this conclusion.

Among the amphoteric oxides, what is the oxidation number of chromium, respectively, in these compounds?

It is known that acetone is a type of ketone widely used as a solvent in the industry, mainly for the production of plastics, paints, and varnishes. Furthermore, studies show that its use can pose risks to human health and the environment. Considering the context, answer: a) Describe the general structure of a ketone and what sets it apart from other functional groups. b) Identify and explain some of the risks associated with exposure to acetone for health and the environment. c) Propose individual and collective measures that can be adopted to reduce the negative impacts caused by the responsible use and disposal of acetone.