Atoms, Elements and Compounds Quiz
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5 questions, one answer each
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1. What is an atom?
- A. The smallest part of an element that can exist
- B. A mixture of two elements
- C. The largest part of a compound
- D. A type of chemical bond
2. Which of these is a mixture, not a compound?
- A. Carbon dioxide
- B. Air
- C. Water
- D. Sodium chloride
3. Which technique would best separate salt dissolved in water?
- A. Filtration
- B. Chromatography
- C. Crystallisation
- D. Using a magnet
4. How can a compound be separated into its constituent elements?
- A. By filtration
- B. By a chemical reaction only
- C. By using a magnet
- D. By dissolving in water
5. A mixture of iron filings and sulfur powder is heated strongly until they react. What happens to the mixture's magnetic properties?
- A. It remains magnetic because iron is still present
- B. It becomes non-magnetic because a new compound, iron sulfide, has formed
- C. It becomes more magnetic because sulfur enhances iron's properties
- D. Nothing changes because heating does not affect magnetism