Elements, Compounds and Mixtures Quiz
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5 questions, one answer each
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1. Which of the following best describes an element?
- A. Two or more substances chemically combined
- B. A substance made of only one type of atom
- C. Any substance that can be separated by filtration
- D. A mixture with fixed proportions
2. Which statement correctly distinguishes a compound from a mixture?
- A. A compound can be separated by physical methods; a mixture cannot
- B. A mixture has fixed proportions; a compound does not
- C. A compound is chemically combined in fixed proportions; a mixture is not chemically combined
- D. There is no real difference between a compound and a mixture
3. What are the relative charges of a proton, neutron and electron respectively?
- A. +1, -1, 0
- B. +1, 0, -1
- C. -1, 0, +1
- D. 0, +1, -1
4. An atom has proton number 17 and mass number 35. How many neutrons does it have?
- A. 17
- B. 18
- C. 35
- D. 52
5. An atom has 15 electrons. Which electronic configuration correctly represents this atom?
- A. 2,8,8
- B. 2,8,5
- C. 8,2,5
- D. 2,13