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Grade 9 · Science

Grade 9 Chemistry worksheet

20 questions on chemistry. The answer key is a separate download.

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What is on the worksheet

  1. In a simplified isotope exercise, atomic number Z = 10 and mass number A = 30. How many neutrons?

  2. A hypothetical element has isotopes of mass 12 u (95%) and 14 u (5%). Calculate its mean atomic mass in u.

  3. A hypothetical element has isotopes of mass 18 u (70%) and 23 u (30%). Calculate its mean atomic mass in u.

  4. In a simplified isotope exercise, atomic number Z = 7 and mass number A = 29. How many neutrons?

  5. A hypothetical element has isotopes of mass 69 u (90%) and 71 u (10%). Calculate its mean atomic mass in u.

  6. Atomic structure and chemical language: which term fits this description? A reaction that absorbs heat from the surroundings under the specified conditions.

    1. Mole
    2. Anion
    3. Product
    4. Endothermic reaction

  7. A hypothetical element has isotopes of mass 49 u (80%) and 53 u (20%). Calculate its mean atomic mass in u.

  8. A hypothetical element has isotopes of mass 61 u (40%) and 62 u (60%). Calculate its mean atomic mass in u.

  9. A hypothetical element has isotopes of mass 28 u (90%) and 33 u (10%). Calculate its mean atomic mass in u.

  10. In a simplified isotope exercise, atomic number Z = 17 and mass number A = 45. How many neutrons?

  11. A hypothetical element has isotopes of mass 56 u (70%) and 62 u (30%). Calculate its mean atomic mass in u.

  12. In a simplified isotope exercise, atomic number Z = 8 and mass number A = 22. How many neutrons?

  13. In a simplified isotope exercise, atomic number Z = 16 and mass number A = 28. How many neutrons?

  14. In a simplified isotope exercise, atomic number Z = 8 and mass number A = 29. How many neutrons?

  15. In a simplified isotope exercise, atomic number Z = 1 and mass number A = 15. How many neutrons?

  16. A hypothetical element has isotopes of mass 50 u (40%) and 52 u (60%). Calculate its mean atomic mass in u.

  17. A hypothetical element has isotopes of mass 83 u (95%) and 88 u (5%). Calculate its mean atomic mass in u.

  18. A hypothetical element has isotopes of mass 85 u (50%) and 86 u (50%). Calculate its mean atomic mass in u.

  19. In a simplified isotope exercise, atomic number Z = 8 and mass number A = 43. How many neutrons?

  20. Atomic structure and chemical language: which term fits this description? An atom or bonded group with a net electric charge.

    1. Electrolyte
    2. Concentration
    3. Molecule
    4. Ion

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