Tawjihi (Palestinian General Secondary Examination), Scientific Stream · Science (Physics, Chemistry, Biology)

Chemistry

32 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 32 questions

  1. How many moles are in g of water, ? (Relative formula mass = 18)
  2. How many moles are in g of carbon dioxide, ? (Relative formula mass = 44)
  3. How many moles are in g of methane, ? (Relative formula mass = 16)
  4. How many moles are in g of sodium chloride, NaCl? (Relative formula mass = 58.5)
  5. How many moles are in g of calcium carbonate, ? (Relative formula mass = 100)
  6. How many moles are in g of sodium hydroxide, NaOH? (Relative formula mass = 40)
  7. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  8. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  9. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  10. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  11. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  12. A solution is made by dissolving g of a substance of molar mass g/mol in water to make L of solution. What is its concentration in mol/L?
  13. A solution has a pH of 2. Which description is correct?
  14. A solution has a pH of 7. Which description is correct?
  15. A solution has a pH of 12. Which description is correct?
  16. A solution has a pH of 5. Which description is correct?
  17. A solution has a pH of 9. Which description is correct?
  18. A solution has a pH of 1. Which description is correct?
  19. How many electrons are in the outer shell of a neutral atom of sodium (Na)?
  20. How many electrons are in the outer shell of a neutral atom of magnesium (Mg)?
  21. How many electrons are in the outer shell of a neutral atom of aluminium (Al)?
  22. How many electrons are in the outer shell of a neutral atom of chlorine (Cl)?
  23. How many electrons are in the outer shell of a neutral atom of oxygen (O)?
  24. How many electrons are in the outer shell of a neutral atom of nitrogen (N)?
  25. Which gas is produced when a metal such as zinc reacts with dilute hydrochloric acid?
  26. Which of the following is an alkali metal?
  27. What type of bond is formed when sodium reacts with chlorine?
  28. Which process separates a mixture of two liquids with different boiling points?
  29. Which of the following is the formula of sulfuric acid?
  30. In an electrolytic cell, the negative electrode is called the
  31. Which alkane has the molecular formula CH?
  32. Which of these changes is a chemical change?

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