Elements, compounds and mixtures Quiz
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5 questions, one answer each
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1. A particle diagram shows identical particles, each made of one red and two blue atoms joined together. What is the substance?
- A. An element
- B. A compound
- C. A mixture of elements
- D. A mixture of compounds
2. Which of these is a mixture?
- A. Water
- B. Carbon dioxide
- C. Seawater
- D. Oxygen
3. Why can the iron be removed from a mixture of iron and sulfur using a magnet?
- A. The iron is chemically bonded to the sulfur
- B. The iron keeps its own properties in a mixture
- C. The sulfur becomes magnetic
- D. The mixture is a compound
4. Which statement about a compound is correct?
- A. It contains elements in any proportion
- B. It has the same properties as its elements
- C. It can be separated by filtering
- D. It contains elements in a fixed ratio
5. 100 cm³ of air is passed over hot copper and 79 cm³ of gas remains. What percentage of the air reacted?
- A. 79%
- B. 21%
- C. 18%
- D. 100%