Matter and its nature, Dalton's atomic theory, concept of atom molecule element and compound - One Line Questions

1. Dalton's atomic theory was proposed in the year: — 1803
2. Which of the following is NOT considered matter? — Light
3. Which of the following is an example of a pure substance? — Sugar
4. Which of the following has a definite chemical composition? — Pure water
5. A substance that cannot be broken down into simpler substances by chemical means is called a(n): — Element
6. What is the fundamental particle of a compound that retains its chemical properties? — Molecule
7. The smallest particle of an element that can exist independently is a(n): — Atom
8. What is the basic unit of a compound? — Molecule
9. The smallest particle of matter that retains the chemical properties of a substance is called: — Molecule
10. Which of the following is NOT a postulate of Dalton's atomic theory regarding atoms? — Atoms can be divided into subatomic particles.
11. Dalton's atomic theory states that atoms of different elements combine to form: — Molecules of compounds
12. A molecule is the smallest particle of a substance that: — Can exist independently and exhibits all the properties of the substance.
13. Which of the following substances is an element? — Iron (Fe)
14. A substance that consists of only one type of atom is called a(n): — Element
15. Dalton's atomic theory considered atoms to be: — Electrically neutral entities
16. A substance formed when two or more chemical elements are chemically bonded together is called a(n): — Compound
17. Which term describes a combination of two or more substances that are not chemically bonded? — Mixture
18. Dalton's atomic theory states that atoms combine in the ratio of small whole numbers to form: — Molecules of compounds
19. The concept of a molecule was developed to explain the behavior of: — Both elements and compounds
20. The law of definite proportions is consistent with which of the following concepts? — Atoms combine in simple whole number ratios.
21. Which of the following is a characteristic of a mixture? — Components retain their individual properties
22. Which of the following is a compound? — Ammonia (NH₃)
23. Which of the following is a polyatomic molecule? — O₃
24. Which of the following is a diatomic molecule? — HCl
25. According to Dalton's atomic theory, atoms of a given element are: — Identical in all respects.
26. According to Dalton's atomic theory, atoms of the same element are: — Identical in mass and properties.
27. Dalton's atomic theory proposed that atoms are: — Indivisible and indestructible
28. Which of the following is a characteristic of matter? — It possesses mass and occupies space.
29. The concept of an atom was first proposed by: — Democritus
30. According to Dalton, atoms of different elements differ in: — Both mass and chemical properties
31. Which of the following is NOT a postulate of Dalton's atomic theory? — Atoms of different elements can be converted into one another.
32. A substance composed of two or more elements chemically combined in a fixed ratio is a(n): — Compound
33. What is the fundamental unit of a chemical element? —
34. What is the smallest particle of an element that retains its chemical identity? — Atom
35. The basic unit of a chemical element is the: — Atom
36. The basic building blocks of all matter are called: — Atoms
37. Which of the following represents a molecule of a compound? — H₂O
38. Which of the following is an example of an element that exists as discrete atoms? — Helium (He)
39. Which of the following is an example of a compound? — Sodium chloride (NaCl)
40. Which of the following is an example of a diatomic element? — Nitrogen (N₂)
41. Dalton's atomic theory suggested that atoms of one element could be transformed into atoms of another element during: — Chemical reactions
42. According to Dalton's atomic theory, atoms cannot be created or destroyed in a: — Chemical reaction
43. The smallest unit of matter that exhibits the properties of an element is: — Atom
44. A compound's properties are typically __________ than those of its constituent elements. — Different
45. Which of the following is a molecular element? — Sulfur (S)
46. Which of the following is an example of matter? — Smoke
47. According to Dalton's atomic theory, chemical reactions involve: — The rearrangement, combination, or separation of atoms.
48. Dalton's atomic theory helped explain the laws of chemical combination, such as: — Both A and B.
49. Dalton's atomic theory was a significant advancement because it provided a quantitative basis for understanding: — The laws of chemical combination.
50. Which of the following is an example of an element? — Oxygen (O₂)
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