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Grade 12 · Science

Grade 12 Chemistry worksheet

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

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What is on the worksheet

  1. A hypothetical element has isotopes of mass 25 u (15%) and 28 u (85%). Calculate its mean atomic mass in u.

  2. A hypothetical element has isotopes of mass 25 u (15%) and 29 u (85%). Calculate its mean atomic mass in u.

  3. An ideal gas occupies 17 L at 400 K. With pressure and amount fixed, find its volume at 800 K in L.

  4. An ideal decay model starts with 3904 mg. What expected mass remains after 6 half-lives, in mg?

  5. A solution contains 28 mol of solute in a final solution volume of 4 L. Find concentration in mol/L as a fraction or decimal.

  6. A sample has mass 196 g and molar mass 28 g/mol. Find its amount in mol.

  7. A solution contains 11 mol of solute in a final solution volume of 15 L. Find concentration in mol/L as a fraction or decimal.

  8. A hypothetical element has isotopes of mass 50 u (15%) and 55 u (85%). Calculate its mean atomic mass in u.

  9. An ideal gas occupies 18 L at 260 K. With pressure and amount fixed, find its volume at 520 K in L.

  10. An ideal gas occupies 11 L at 200 K. With pressure and amount fixed, find its volume at 600 K in L.

  11. An ideal gas occupies 13 L at 390 K. With pressure and amount fixed, find its volume at 780 K in L.

  12. A hypothetical element has isotopes of mass 46 u (5%) and 51 u (95%). Calculate its mean atomic mass in u.

  13. A solution contains 3 mol of solute in a final solution volume of 1 L. Find concentration in mol/L as a fraction or decimal.

  14. An ideal gas occupies 21 L at 330 K. With pressure and amount fixed, find its volume at 990 K in L.

  15. An ideal gas occupies 23 L at 210 K. With pressure and amount fixed, find its volume at 630 K in L.

  16. A hypothetical element has isotopes of mass 80 u (45%) and 86 u (55%). Calculate its mean atomic mass in u.

  17. A hypothetical element has isotopes of mass 14 u (5%) and 16 u (95%). Calculate its mean atomic mass in u.

  18. An ideal gas occupies 23 L at 270 K. With pressure and amount fixed, find its volume at 810 K in L.

  19. A solution contains 29 mol of solute in a final solution volume of 14 L. Find concentration in mol/L as a fraction or decimal.

  20. An ideal gas occupies 14 L at 320 K. With pressure and amount fixed, find its volume at 960 K in L.

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