Nanoparticles Quiz
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5 questions, one answer each
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1. What size range defines nanoscience structures?
- A. 1–100 mm
- B. 1–100 μm
- C. 1–100 nm
- D. 1–100 pm
2. Roughly how many atoms make up a typical nanoparticle?
- A. A few
- B. A few hundred
- C. A few million
- D. A few billion
3. Why do nanoparticles often behave differently from the same substance in bulk?
- A. They have fewer electrons
- B. They have a very high surface area to volume ratio
- C. They are always negatively charged
- D. They contain different elements
4. Which of these is NOT a stated application of nanoparticles?
- A. New catalysts
- B. Self-cleaning coatings
- C. Highly selective sensors
- D. Producing table salt
5. A nanoparticle and a large lump of the same material are compared. Which best explains why the nanoparticle may react faster with a gas?
- A. It has fewer atoms overall
- B. A greater proportion of its atoms are on the surface and exposed to the gas
- C. It has a lower melting point
- D. It contains impurities