FUVEST (University of São Paulo Entrance Exam) · Chemistry and Biology

Chemistry

39 practice questions, each with the answer and an explanation.

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All 39 questions

  1. How many protons does a neutral carbon atom contain?
  2. What is the pH of a neutral aqueous solution at 25 degrees Celsius?
  3. What is the molar mass of water (H = 1 g/mol, O = 16 g/mol)?
  4. In 2 H2 + O2 -> 2 H2O, how many moles of O2 react with 4 mol of H2?
  5. What type of bond mainly holds sodium chloride (NaCl) together?
  6. What is the pH of a 0.01 mol/L solution of the strong acid HCl?
  7. What mass of NaOH (40 g/mol) is needed to prepare 500 mL of a 0.2 mol/L solution?
  8. What is the shape of the carbon dioxide (CO2) molecule?
  9. What is the name of the hydrocarbon with formula C2H6?
  10. 6 g of H2 reacts with 32 g of O2 (H2 = 2, O2 = 32 g/mol). What mass of water forms at most?
  11. What is the oxidation number of manganese in KMnO4?
  12. An exothermic reaction at equilibrium is heated. According to Le Chatelier's principle, what happens?
  13. Which of these elements is a noble gas?
  14. Which quantity does the Avogadro constant, about 6.02 x 10^23 per mole, represent?
  15. Which compound is a carboxylic acid?
  16. What volume do 2 mol of an ideal gas occupy at 273 K and 1 atm (22.4 L/mol)?
  17. In a galvanic (voltaic) cell, at which electrode does oxidation occur?
  18. 100 mL of a 2 mol/L solution is diluted with water to 400 mL. What is the new concentration?
  19. Ethanol and dimethyl ether both have the formula C2H6O. What are they called?
  20. How does a catalyst increase the rate of a reaction?
  21. 100 mL of 0.1 mol/L HCl is mixed with 50 mL of 0.1 mol/L NaOH. What is the approximate pH?
  22. What do an acid and a base produce when they react completely?
  23. What is the name of the alkane with the formula C3H8?
  24. At which electrode does oxidation take place in a galvanic cell?
  25. In an equilibrium system, what happens when the concentration of a reactant is increased?
  26. N2 + 3 H2 -> 2 NH3. If 5 mol of N2 react with 9 mol of H2, how many moles of NH3 can form at most?
  27. What is the oxidation number of chromium in potassium dichromate, K2Cr2O7?
  28. Two moles of an ideal gas occupy 24.6 L at 300 K. What is the pressure? (R = 0.082 atm·L/(mol·K))
  29. What is the molar mass of carbon dioxide, CO2 (C = 12, O = 16)?
  30. How many particles are in one mole of a substance?
  31. What is the pH of a 0.001 mol/L solution of hydrochloric acid?
  32. What are the products of the complete combustion of a hydrocarbon?
  33. What determines the identity of a chemical element?
  34. Which functional group characterises carboxylic acids?
  35. How does a catalyst speed up a reaction?
  36. What is the molecular shape of carbon dioxide?
  37. What is the oxidation number of nitrogen in ammonia, NH3?
  38. A buffer contains equal concentrations of a weak acid with pKa 4.75 and its conjugate base. What is its pH?
  39. For A + B <-> 2 C, the equilibrium concentrations are [A] = 1 mol/L, [B] = 2 mol/L and [C] = 4 mol/L. What is Kc?

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