Chemical Purity Calculation Quiz
Test your knowledge and calculation skills on chemical purity. Answer all questions to the best of your ability.
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1. What is the definition of chemical purity?
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The proportion of a substance that is made up of the desired chemical compound.
The color and odor of a chemical sample.
The boiling point of a chemical.
The storage conditions of a chemical.
2. Calculate the purity (%) of a 5.00 g sample that contains 4.70 g of pure substance.
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3. Which of the following methods can be used to determine chemical purity?
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Melting point analysis
Chromatography
Spectroscopy
All of the above
4. If a sample contains 98.5% pure compound, what percentage is impurity?
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5. Select the correct formula to calculate purity:
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(Mass of pure substance / Total mass of sample) × 100
Total mass of sample × 100
(Volume of solvent / Mass of sample) × 100
None of the above
6. Given a 10.0 g sample with 0.2 g impurities, what is the purity (%)?
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7. Which impurity is most likely to affect the melting point of a sample?
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A soluble solid impurity
An insoluble gas
Water vapor
None of the above
8. Describe a real-world scenario where chemical purity is critical.
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9. Rate your confidence in performing chemical purity calculations.
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