???? CONTENTS COVERED IN THE CLASS ???? ✓ Hey guys, how are you? CORRECTION of the FMJ 2025 exam - Jundiaí School of Medicine QUESTION 01 Analyze the graph that shows the production of oxygen gas (O2) as a function of time for the decomposition of hydrogen peroxide (H2O2) catalyzed by potassium iodide (KI). Although catalysts are not consumed during the reactions, KI reacts with the oxygen produced in the decomposition reaction of H2O2, according to the equation: a) Determine at what time, t1, t2 or t3, KI was added to the system. Write the balanced equation that represents the decomposition of H2O2. b) From the reaction of KI with O2, write the ionic equation that represents the oxidation of the I – ion, forming molecular iodine (I2). Considering Avogadro's constant equal to 6 × 1023 mol–1, calculate the amount of electrons provided by the I– ion when KI reacts with 0.05 mol of O2. QUESTION 02 In a container with a volume of 10 L, there are 2 mol of hydrogen gas (H2), 0.5 mol of oxygen gas (O2) and 2.5 mol of helium gas (He), at a temperature of 300 K. At a certain moment, an electric spark is produced by a generator and launched inside the container, promoting the reaction between the gases H2 and O2. After the temperature is restored to the initial condition, it is found that there is water (H2O) in the liquid state inside the container and that the new pressure of the system is equal to X. The equation that represents the reaction that occurred is: a) Considering that there is an excess of hydrogen gas in the reaction, represent, in the figure in the Resolution and Answer field, the composition of the system after the launch of the spark inside the container. Explain, based on the ∆H of the reaction, why the temperature must be restored before measuring the new pressure. b) Calculate the mass of water, in grams, produced in the reaction that occurred inside the system. Considering the value of the universal gas constant (R) equal to 0.08 atm ⋅ L ⋅ mol–1 ⋅ K–1, calculate the value of the pressure X, in atm, observed after the temperature was restored to its initial condition. QUESTION 03 The artificial ripening of certain vegetables can be promoted by the addition of acetylene gas (C2H2) in a closed environment. However, this artificial ripening can be harmful to the consumer who eats vegetables subjected to this procedure. The following graphs show the different concentrations of sodium (Na+), bicarbonate (HCO3–), potassium (K+), and chloride (Cℓ–) ions in the plasma of rats fed a vegetable that was naturally ripened (A) and the same type of vegetable that was artificially ripened using acetylene gas (B). a) Using the information obtained from the graphs, write the formula for the salt formed by the cation that undergoes the smallest change in concentration and the anion that undergoes the largest increase in concentration when the vegetable is subjected to acetylene-induced ripening. Considering the nuclei of all atoms, what is the total number of protons in the formula of this salt? b) Write the Lewis formula for acetylene. Considering the ionic product of water (Kw) to be 10–14, calculate the pH of a solution formed by dissolving 0.005 mol of the base produced in the reaction to produce acetylene from calcium carbide in enough water to obtain 1 L of solution. QUESTION 04 Tea tree (Melaleuca alternifolia) is a medicinal plant rich in essential oil and with powerful antimicrobial and antifungal action. The essential oil of this plant contains, in large quantities, the substances terpinen-4-ol (M = 154 g/mol) and γ-terpinene (M = 136 g/mol), whose structures are represented below. For tea tree oil to be effective as an antiseptic, it must contain at least 30% by mass of terpinen-4-ol. Tea tree oil with antiseptic effect has a density equal to 0.9 g/mL. a) Identify the organic function of terpinen-4-ol. What is the name of the chemical reaction that must be carried out for terpinen-4-ol to be converted to γ-terpinene? b) Calculate the mass of terpinen-4-ol, in grams, present in 300 mL of oil with the minimum terpinen-4-ol content necessary for it to be effective as an antiseptic. Calculate the concentration, in mol/L, of terpinen-4-ol present in tea tree oil with antiseptic effect. Unesp Santa Casa Einstein FMJ Famema Famerp ✏️ Spreadsheet with ALL the classes on the channel - https://bit.ly/4cQRqwP ???? SUBSCRIBE TO THE CHANNEL - https://bit.ly/3zY1x21 ???? Did you like the video? Leave your LIKE! ???? Want to help with the continuation of the project: PIX key [email protected] Follow me on social media: ✏️Instagram: / prof_igor_quimica ✏️Twitter: / igorsuga ✏️Blog: https://igorsuga.wordpress.com/ #chemistry #igorquimica #medicine #vunesp #review #chemistry #FMJ #correction #answer key