Uzbekistan National Certificate (Milliy sertifikat) · Physics and Chemistry

Chemistry

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

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 46 questions

  1. What is the chemical symbol of sodium?
  2. The atomic number of an element is equal to the number of...
  3. What is the pH of a neutral solution at 25 degrees Celsius?
  4. What is the molar mass of carbon dioxide ()? Use C = 12 and O = 16.
  5. In the balanced equation , what is the coefficient of water?
  6. Which of these elements is a noble gas?
  7. What type of bond holds sodium chloride together?
  8. How many valence electrons does a chlorine atom have?
  9. What are the products when an acid reacts with a base?
  10. What is the approximate value of Avogadro's number?
  11. Which gas is released when zinc reacts with hydrochloric acid?
  12. What is the formula of propane?
  13. How many moles are in 36 g of water? (M = 18 g/mol)
  14. 4 g of sodium hydroxide (M = 40 g/mol) is dissolved to make 0.5 L of solution. What is the concentration?
  15. When calcium carbonate decomposes (), what mass of CaO forms from 100 g of ? (Ca = 40, C = 12, O = 16)
  16. What is the oxidation state of manganese in ?
  17. Which of these is an alkali metal?
  18. What chemical process causes iron to rust?
  19. What is the pH of a 0.01 mol/L solution of hydrochloric acid, a strong acid?
  20. Elements in the same group of the periodic table share which feature?
  21. How many moles are there in 24.5 g of H₂SO₄? (molar mass 98 g/mol)
  22. What is the mass of 0.25 mol of CaO? (molar mass 56 g/mol)
  23. 0.25 mol of solute is dissolved to make 4 dm³ of solution. What is the molarity?
  24. What volume does 0.25 mol of H₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
  25. What is the percentage by mass of C in CH₄?
  26. How many moles are there in 126 g of HNO₃? (molar mass 63 g/mol)
  27. What is the mass of 2 mol of CaO? (molar mass 56 g/mol)
  28. What volume does 0.5 mol of H₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
  29. How many neutrons are in an atom of Na-23 (atomic number 11)?
  30. What is the electronic configuration (shell by shell) of the element N (atomic number 7)?
  31. What is the molar mass of Na₂CO₃? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  32. How many moles are there in 25.5 g of Al₂O₃? (molar mass 102 g/mol)
  33. What is the mass of 2 mol of KOH? (molar mass 56 g/mol)
  34. What is the molar mass of H₂O? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  35. What is the mass of 0.25 mol of Fe₂O₃? (molar mass 160 g/mol)
  36. What is the mass of 0.25 mol of KMnO₄? (molar mass 158 g/mol)
  37. What volume does 3 mol of NH₃ gas occupy at STP? (molar volume 22.4 dm³/mol)
  38. How many moles are there in 51 g of Al₂O₃? (molar mass 102 g/mol)
  39. What is the mass of 1.5 mol of HCl? (molar mass 36.5 g/mol)
  40. For the reaction N₂ + 3H₂ → 2NH₃, what mass of NH₃ forms from 140 g of N₂? (molar masses: N₂ = 28, NH₃ = 17 g/mol)
  41. How many neutrons are in an atom of K-39 (atomic number 19)?
  42. What is the electronic configuration (shell by shell) of the element S (atomic number 16)?
  43. What is the molar mass of CH₄? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  44. What is the mass of 5 mol of H₂O? (molar mass 18 g/mol)
  45. What is the molar mass of Al₂O₃? (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Mn = 55, Fe = 56)
  46. How many moles are there in 333 g of CaCl₂? (molar mass 111 g/mol)

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