(Originais Teachy 2023) - Question Easy of Chemistry

A white solid presents the following properties: I. It is soluble in water. II. Its aqueous solution conducts electric current. III. When pure, the solid does not conduct electric current. IV. When melted, the resulting pure liquid does not conduct electric current. Considering this information, the solid in question can be

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.

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.

Consider a salt that undergoes hydrolysis in water, producing a weak acid and a weak base. How to determine if the final solution will be acidic or basic? How to calculate the final concentration or pH of the resulting solution? Give an example of a salt and calculate the pH of the resulting solution.