Correção UNICAMP 2024 | Química

Correction of the UNICAMP 2024 Chemistry Exam. QUESTION 20 (UNICAMP 2024) The graph below shows the average consumption of soft drinks per capita per year, from 2010 to 2021, in Brazil. QUESTION 21 (UNICAMP 2024) The glycemic response is the curve of glucose concentration as a function of time in the blood. It is used as a way to classify foods based on their potential to raise blood glucose (sugar). QUESTION 22 (UNICAMP 2024) A common soft drink is a formulation of several ingredients: sugar (11 g per 100 mL), water (88 g per 100 mL) – major components –, in addition to acidulants, antioxidants, preservatives, sweeteners and CO2 (components in small quantities). The purpose of an acidulant is to regulate the sweetness of the sugar, enhance the flavor, and reduce the pH of the soft drink, which should be between 2.7 and 3.5. Thus, to use a small mass of acidulant that provides the reduction of the pH to the desired value, the molar mass of the acidulant must be QUESTION 23 (UNICAMP 2024) Poor management of the production of lead-acid automotive batteries and their recycling after use can cause contamination of the environment and people. To minimize these problems, the industry can take into account the "waste hierarchy," an order of preference in actions to combat contamination. The following figure, incomplete, shows two possible actions of this hierarchy. QUESTION 24 (UNICAMP 2024) At the beginning of 2023, a group of researchers studied the development of a solid polyamine containing copper, capable of adsorbing CO2 in the gas phase and at low concentrations. The figure to the side shows the adsorption scheme with the representation of the solid: QUESTION 25 (UNICAMP 2024) Some batteries transform certain substances into others, generating electrical energy. This allows, for example, the operation of equipment based on this energy (electric cars) or assists the operation of equipment (internal combustion cars). This is why electric cars need to be recharged from time to time, while combustion cars do not, since the battery of the latter is charged during their operation. QUESTION 26 (UNICAMP 2024) A group of researchers studied the antibacterial activity – acting on two bacteria, namely, Escherichia coli and Staphylococcus aureus – of free curcumin and curcumin combined with octaarginine. The researchers observed that free curcumin exhibits antibacterial activity against one of the bacteria. In its combined form, curcumin was more efficient – ​​compared to its free form – in combating both microorganisms. 🔔 SUBSCRIBE TO THE CHANNEL - https://bit.ly/3zY1x21 👍 Did you like the video? Leave your LIKE! Follow me on social media too: ✏️Instagram:   / prof_igor_quimica   ✏️Twitter:   / igorsuga   ✏️Blog: https://igorsuga.wordpress.com/ #chemistry #eunaunicamp #igorchemistry #vestibular #organicchemistry #unicampreview #chemistryreview