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Grade 8 · Chemistry

Grade 8 Chemistry practice

20 questions on analytical chemistry, general chemistry, organic chemistry. The answer key is a separate download.

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What is on the worksheet

  1. A model solution contains 57 g solute and 335 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  2. A model solution contains 31 g solute and 178 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  3. A model solution contains 32 g solute and 448 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  4. A model solution contains 55 g solute and 207 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  5. A model solution contains 17 g solute and 145 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  6. A model solution contains 51 g solute and 85 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  7. A model solution contains 39 g solute and 236 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  8. A model solution contains 39 g solute and 316 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  9. A model solution contains 59 g solute and 379 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  10. A model solution contains 7 g solute and 449 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  11. A model solution contains 21 g solute and 308 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  12. An ion has 12 protons and 10 electrons. What is its signed charge number?

  13. A model solution contains 48 g solute and 466 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  14. A model solution contains 31 g solute and 171 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  15. A model solution contains 41 g solute and 229 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  16. How many carbon atoms are written in CH₃CH₂CH₃?

  17. A pure compound is chemically decomposed. Is this merely sorting an existing mixture?

    1. No; chemical bonds are changed.
    2. Yes; color is the only difference.
    3. Yes; compounds are always mixtures.

  18. A model solution contains 3 g solute and 119 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  19. A model solution contains 25 g solute and 80 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

  20. A model solution contains 38 g solute and 435 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

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