(Originais Teachy 2023) - Question Easy 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 equation is a mathematical equation that represents an equality: all atoms and their quantities that appear in the reactants must also be present in the products. Considering a chemical equation and its corresponding equilibrium constant, it can be correctly stated that, by multiplying all its coefficients by 2, the equilibrium constant associated with this new equation will be

The search for alternative and more sustainable energy sources has led to the development of fuels composed of mixtures with ideal combustion characteristics. One of the challenges in this process is the improvement of the energy efficiency of internal combustion engines, which depends, in part, on the uniformity of the fuel mixture. Considering an internal combustion engine, where the efficiency of the fuel burning process is directly related to the homogeneity of the air-fuel mixture, a chemical engineer decides to investigate the behavior of different mixtures under pressure and temperature conditions similar to those found in the combustion chamber. For his analysis, he selects two mixtures: the first one is atmospheric air, mainly composed of nitrogen (78%), oxygen (21%), and other gases in lower concentrations, known to be a homogeneous mixture; the second one is a mixture of ethanol and water, in which ethanol and water form two distinct phases due to their differences in polarity and intermolecular interactions, considered a heterogeneous mixture. Based on the concepts of homogeneous and heterogeneous mixtures, which of the two mixtures investigated is more suitable to be used as fuel in an internal combustion engine, considering the goal of maximizing the energy efficiency of the burning process?

The addition reaction is a chemical reaction that occurs between two or more reactants and produces a single product. This reaction is characterized by the addition of a functional group to another, the latter usually being an alkene. Which of the following substances is an alkene?