Thermal stability and flame colours Quiz
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5 questions, one answer each
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1. Which gas is produced when calcium nitrate is heated strongly, in addition to oxygen?
- A. Nitrogen
- B. Nitrogen monoxide
- C. Nitrogen dioxide
- D. Ammonia
2. Why is magnesium carbonate less stable to heat than calcium carbonate?
- A. Mg²⁺ has more electrons
- B. Mg²⁺ is smaller, so it has a higher charge density and polarises the carbonate ion more
- C. Mg²⁺ is larger than Ca²⁺
- D. Magnesium is less reactive than calcium
3. Which flame colour shows a potassium compound?
- A. Red
- B. Yellow
- C. Apple green
- D. Lilac
4. What is the solid product when sodium nitrate is heated?
- A. Sodium oxide
- B. Sodium nitrite
- C. Sodium metal
- D. Sodium peroxide
5. What happens to the electrons that cause a flame colour?
- A. They are promoted, then fall back and emit light
- B. They are removed completely from the atom
- C. They gain mass in the flame
- D. They fall to a lower level first and then absorb light