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

Chemistry and Biology

20 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 20 questions

  1. What is the atomic number of carbon?
  2. What type of bond holds sodium chloride (NaCl) together?
  3. What is the pH of a 0.01 mol/L solution of hydrochloric acid?
  4. Approximately how many particles are in one mole of a substance?
  5. What is the molar mass of water (H₂O) given H = 1 and O = 16?
  6. How many moles are in 36 g of water (molar mass 18 g/mol)?
  7. Which group of the periodic table contains the noble gases?
  8. What is the oxidation state of manganese in KMnO₄?
  9. In CH₄ + 2O₂ → CO₂ + 2H₂O, how many moles of O₂ burn 2 mol of CH₄?
  10. What is the pH of a 0.1 mol/L solution of sodium hydroxide at 25 °C?
  11. 2 mol of H₂ react with 2 mol of O₂ (2H₂ + O₂ → 2H₂O). How many mol of water form?
  12. Which organelle is the main site of aerobic respiration in a cell?
  13. In DNA, which base pairs with adenine?
  14. Why does an enzyme stop working at very high temperature?
  15. Mitosis normally produces
  16. In a monohybrid cross of Aa × Aa, what is the expected phenotype ratio if A is dominant?
  17. A heterozygous plant (Aa) is crossed with a homozygous recessive plant (aa). What is the expected ratio of offspring genotypes?
  18. A carrier mother (X^H X^h) and an unaffected father (X^H Y) have a son. What is the chance he has an X-linked recessive disorder?
  19. Which organ produces insulin in humans?
  20. A human cell with 46 chromosomes undergoes meiosis. How many chromosomes does each gamete have, and what number does the zygote have?

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