Chemistry Multiple Choice Questions (MCQ) on Matter, Substance and Mixtures

Chemistry students in Papua New Guinea can take the below online test to strengthen their understanding of fundamental concepts essential for success in their national examinations. The test covers key topics such as distinguishing pure and impure substances, understanding the difference between elements and compounds, and recognizing the characteristics of homogeneous and heterogeneous mixtures. By practicing these carefully designed multiple-choice questions, students build their knowledge of traditional and modern measurement systems, physical quantities, and SI units—topics that are crucial for mastering chemistry principles. This online format allows students to engage with the material interactively and conveniently, improving their problem-solving skills and readiness for the national exams, ultimately supporting their academic growth and future opportunities in science. 



 How to Take the Questions 
  •  Select the options by clicking on the radio button
  •  Click on VIEW MY SCORE button at the end of the questions to view your results. 
  •  If you made mistake (s), you can try answer them again. All the best

1. What is a pure substance?

A. A mixture of different elements
B. A substance made of only one type of particle
C. A solution containing impurities
D. A substance that can be separated by physical means

2. Which of the following best describes an impure substance?

A. Made of only one element
B. Has fixed melting and boiling points
C. Contains two or more different substances physically mixed
D. Cannot be separated by physical means

3. Which of the following is true about the composition of compounds?

A. Compounds are made of one type of atom
B. Compounds are mixtures of elements not chemically combined
C. Compounds contain two or more elements chemically bonded in a fixed ratio
D. Compounds cannot be broken down into simpler substances

4. Which statement correctly differentiates an element from a compound?

A. Elements are mixtures; compounds are pure substances
B. Elements consist of one type of atom; compounds consist of different atoms chemically combined
C. Compounds can be separated physically; elements cannot
D. Elements always contain oxygen

5. What is a homogeneous mixture?

A. A mixture with visible different parts
B. A pure compound
C. A mixture with uniform composition throughout
D. A mixture that cannot be separated

6. How does a heterogeneous mixture differ from a homogeneous mixture?

A. Heterogeneous mixtures have uniform composition
B. Heterogeneous mixtures have visibly different components
C. Homogeneous mixtures cannot be separated physically
D. Homogeneous mixtures always contain solids

7. Which of the following is an example of a homogeneous mixture?

A. Salt dissolved in water
B. Salad dressing
C. Sand and iron filings
D. Oil and water

8. Which of these mixtures is heterogeneous?

A. Air
B. Sugar solution
C. Oil and water
D. Saltwater

9. What property helps to distinguish a pure substance from a mixture?

A. Ability to be separated physically
B. Uniformity of composition
C. Presence of multiple phases
D. Color

10. Which of the following mixtures can be separated by filtration?

A. Saltwater
B. Sugar dissolved in water
C. Air
D. Sand and water

11. Which of the following best describes the composition of a compound?

A. Fixed ratio of two or more elements chemically combined
B. Variable composition of elements physically mixed
C. Mixed substances with no chemical bonding
D. Single element only

12. What happens when compounds are separated?

A. They break into smaller compounds
B. They remain chemically bonded
C. They break down into their elements
D. They become mixtures

13. Which statement is true about homogeneous mixtures?

A. Components are easily seen and separated
B. Composition varies throughout
C. They are always composed of solids
D. They have uniform composition throughout

14. Which of the following is NOT a characteristic of heterogeneous mixtures?

A. Components can be physically separated
B. Uniform composition throughout
C. Different phases visible
D. Components retain their properties

15. Which of the following is an example of a pure compound?

A. Water (H₂O)
B. Air
C. Saltwater
D. Soil

16. Which of the following mixtures cannot be easily separated by physical methods?

A. Sand and water
B. Salt dissolved in water
C. Iron filings and sand
D. Oil and water

17. Which feature distinguishes a compound from a mixture?

A. Compounds have variable composition
B. Mixtures have fixed chemical formulas
C. Compounds have fixed ratios of elements chemically bonded
D. Mixtures are chemically bonded

18. Which of the following best describes a heterogeneous mixture?

A. Components are visibly distinct and not uniform
B. Components are uniformly distributed
C. It is a pure substance
D. It cannot be separated physically

19. Which of these is true about homogeneous mixtures?

A. They have multiple visible phases
B. Components are physically bonded
C. Composition varies in different parts
D. Composition is uniform throughout

20. Which of the following statements is correct?

A. Elements are mixtures of compounds
B. Elements cannot be broken down into simpler substances by chemical means
C. Compounds are mixtures of elements
D. Mixtures have fixed chemical formulas

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