This quiz works best with JavaScript enabled. Home > General Knowledge > Science > Chemistry > Chemistry – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 20 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. It is a substance that the pressure exerted by its vapor when in equilibrium with its liquid or solid. A) Boiling point. B) Heat of vaporization. C) Viscosity. D) Vapor pressure. Show Answer Correct Answer: D) Vapor pressure. 2. What is the mass number? A) The number of protons. B) The number of protons and neutrons. C) The number of neutrons. D) The number of protons and electrons. Show Answer Correct Answer: B) The number of protons and neutrons. 3. What type of particle is:NO2 A) Atom. B) Molecule. C) Formula Unit. D) Ion. Show Answer Correct Answer: B) Molecule. 4. Why do elements bond? A) To fill their outer shell. B) They like electrons. C) To exchange protons. D) None of above. Show Answer Correct Answer: A) To fill their outer shell. 5. Typically, when two atoms form a chemical bond, the expected result is that the electrons A) Will be in the excited state. B) Will be completely removed from both atoms. C) Will complete a noble gas configuration for both atoms. D) All of the choices. Show Answer Correct Answer: C) Will complete a noble gas configuration for both atoms. 6. It resist an external force and this assume a lesser surface area. A) Viscosity. B) Heat of vaporization. C) Surface tension. D) Boiling point. Show Answer Correct Answer: C) Surface tension. 7. If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound? A) 60.1%. B) 28.5%. C) 71.5%. D) 39.9%. Show Answer Correct Answer: C) 71.5%. 8. Which of the following is NOT true about water? A) Water can moderate temperatures. B) Water can adhere to other substance. C) Water does not dissolve many substances. D) Water can climb against gravity. Show Answer Correct Answer: C) Water does not dissolve many substances. 9. If an atom has 12 protons, which of the following must it also have to be considered a neutral atom? A) 12 neutrons. B) 12 electrons. C) 12 protons. D) 24 protons and neutrons. Show Answer Correct Answer: B) 12 electrons. 10. When the outermost energy level of an atom contains the maximum number of electrons A) Ionic bonding occurs. B) Covalent bonding occurs. C) Metallic bonds form. D) The atom is stable. Show Answer Correct Answer: D) The atom is stable. 11. The type of matter that makes up an object and the way it is arranged A) Inertia. B) Composition. C) Reactivity. D) None of above. Show Answer Correct Answer: B) Composition. 12. Which of the following elements is an alkali metal A) Calcium. B) Magnesium. C) Sodium. D) Mercury. Show Answer Correct Answer: C) Sodium. 13. What nucleus of atom contains? A) Protons. B) Electrons. C) Protons and neutrons. D) Electrons and protons. Show Answer Correct Answer: C) Protons and neutrons. 14. Density is one of the properties of a substance. How is the property classified? A) Physical and intensive. B) Physical and extensive. C) Chemical and intensive. D) Chemical and extensive. Show Answer Correct Answer: B) Physical and extensive. 15. Branch of chemistry that studies matrials that dont have carbon A) Inorganic. B) Physical. C) Organic. D) Anatlytical. Show Answer Correct Answer: A) Inorganic. 16. What is an ionic bond? A) When a metal and a metal bond together. B) When a metal and a non-metal bond together. C) When a non-metal and a non-metal bond together. D) None of above. Show Answer Correct Answer: B) When a metal and a non-metal bond together. 17. The second energy level can hold up to ..... valence electrons A) 8. B) 18. C) 2. D) 36. Show Answer Correct Answer: A) 8. 18. What are the factors that affect solubility? A) Rate of stirring. B) Particle size. C) Temperature. D) All of these. Show Answer Correct Answer: D) All of these. 19. Empirical formula of C6H12O6 is A) CHO. B) CH2O. C) C3H6O3. D) C6H12O6. Show Answer Correct Answer: B) CH2O. 20. What kind of ions are found in basic solutions? A) OH. B) H+. C) H3O+. D) None of above. Show Answer Correct Answer: A) OH. 21. The atomic number tells you what? A) Number of electrons. B) Number of protons. C) Number of neutrons. D) Both electrons and protons in an atom. Show Answer Correct Answer: B) Number of protons. 22. What is the number of valence electrons (the electrons on the outer-most shell) for Oxygen? A) 8. B) 1. C) 2. D) 6. Show Answer Correct Answer: D) 6. 23. The ratio of the number of hydrogen atoms to the number of oxygen atoms in H2O is ..... A) 1:2. B) 2:1. C) 3:1. D) 1:1:1. Show Answer Correct Answer: B) 2:1. 24. What is the monomer of carbohydrates? A) Fatty acid. B) Amino acid. C) Monosaccharide. D) Protein. Show Answer Correct Answer: C) Monosaccharide. 25. The second law of thermodynamics states that useful energy is always A) Being lost. B) Being created. C) Increasing. D) Being stored. Show Answer Correct Answer: A) Being lost. 26. Ionization refers to the process of A) Losing or gaining protons. B) Losing or gaining electrons. C) Changing from one period to another. D) Turning lithium into fluorine. Show Answer Correct Answer: B) Losing or gaining electrons. 27. How do you calculate atomic charge? A) Protons + neutrons. B) Protons-electrons. C) Neutrons + protons. D) None of above. Show Answer Correct Answer: B) Protons-electrons. 28. Iron + oxygen = rust is an example of a ..... A) Chemical property/change. B) Physical property/change. C) Mass. D) Volume. Show Answer Correct Answer: A) Chemical property/change. 29. When one atom loses an electron and becomes positive and another atom gains an electron and becomes negative, they stick together like magnets. What is this called? A) Ionic bond. B) Covalent bond. C) Atomic bond. D) Molecular bond. Show Answer Correct Answer: A) Ionic bond. 30. What is the atomic number of carbon? A) C. B) 12. C) 6. D) 12.011. Show Answer Correct Answer: C) 6. 31. When is an ionic bond formed? A) When protons are shared. B) When electrons are shared. C) When a positive hydrogen attracts a negative atom in another molecule. D) When ions of opposite electrical charges attract each other. Show Answer Correct Answer: D) When ions of opposite electrical charges attract each other. 32. The modern periodic table is arranged according to A) Atomic number. B) How the elements react. C) Atomic mass. D) Electron configuration. Show Answer Correct Answer: A) Atomic number. 33. Hair, skin, muscle, and fingernails are made out of ..... A) Lipids. B) Carbohydrates. C) Cellulose. D) Proteins. Show Answer Correct Answer: D) Proteins. 34. What state of matter has no definite shape, but has a definite volume? A) Solid. B) Liquid. C) Plasma. D) Gas. Show Answer Correct Answer: B) Liquid. 35. What type of particle is:Br2 A) Molecule. B) Formula Unit. C) Atom. D) Ion. Show Answer Correct Answer: A) Molecule. 36. Which scientist measured the charge of an electron as 1.602 x 10-19 Coulombs? A) Democritus. B) Millikan. C) Bohr. D) Rutherford. Show Answer Correct Answer: B) Millikan. 37. What atom matches this electron configuration? 1s22s22p63s2 A) Magnesium. B) Potassium. C) Aluminum. D) Neon. Show Answer Correct Answer: A) Magnesium. 38. Find the mass in grams of 2.25 x 1024 atoms of calcium (Ca). A) 9.02 x 1024 grams. B) 255.1 grams. C) 150 grams. D) 40.0 grams. Show Answer Correct Answer: C) 150 grams. 39. What is a neutron? A) A neutral particle. B) A positively charged particle. C) A negative;y charged particle. D) None of above. Show Answer Correct Answer: A) A neutral particle. 40. The 4 macromolecules are A) Lipids, Waxes, Vitamin A, Water. B) Vitamins, lipids, water, micronutrients. C) Micronutrients, macronutrients, water, vitamins. D) Carbohydrates, Lipids, Proteins, Nucleic Acids. Show Answer Correct Answer: D) Carbohydrates, Lipids, Proteins, Nucleic Acids. 41. The number of protons or electrons found in the nucleus of an atom A) Atomic mass. B) Atomic weight. C) Atomic number. D) Isotope. Show Answer Correct Answer: C) Atomic number. 42. What is the chemical symbol for Chlorine A) Cl. B) C. C) Ch. D) Ce. Show Answer Correct Answer: A) Cl. 43. When an atom loses an electron, it becomes a(n) ..... ion. A) Neutral. B) Polyatomic. C) Negative. D) Positive. Show Answer Correct Answer: D) Positive. 44. Which would have a greater mass, 10 atoms of H or 10 atoms of He? A) They are the same. B) 6.02 x 1023. C) 10 atoms of He. D) 10 atoms of H. Show Answer Correct Answer: C) 10 atoms of He. 45. Atoms have equal number of A) Protons & electrons. B) Protons & neutrons. C) Electrons & neutrons. D) None of above. Show Answer Correct Answer: A) Protons & electrons. 46. Molecules that store genetic information are A) Nucleic acids. B) Carbohydrates. C) Proteins. D) Lipids. Show Answer Correct Answer: A) Nucleic acids. 47. What is extracted from Bauxite? A) Aluminium. B) Mica. C) Copper. D) Tin. Show Answer Correct Answer: A) Aluminium. 48. What is an atomic group? A) All the elements on the periodic table. B) Elements in the same vertical column on the periodic table. C) Elements in the same horizontal column on the periodic table. D) A group of scientists who study atoms. Show Answer Correct Answer: B) Elements in the same vertical column on the periodic table. 49. Which of the following is not one of the 4 main elements found in all macromolecules? A) Carbon. B) Sodium. C) Hydrogen. D) Oxygen. Show Answer Correct Answer: B) Sodium. 50. What precipitate forms when you mix barium nitrate with sodium sulfate? A) Barium sulfate. B) Barium nitrate. C) Sodium nitrate. D) Sodium sulfate. Show Answer Correct Answer: A) Barium sulfate. 51. Pure substance made of only 1 type of atom A) Element. B) Molecule. C) Atom. D) Compond. Show Answer Correct Answer: A) Element. 52. Which is NOT true about atom? A) It is electrically neutral. B) Its central part contains protons and neutrons. C) It has an equal number of protons and neutrons. D) The number of protons determines the chemical property of an element. Show Answer Correct Answer: C) It has an equal number of protons and neutrons. 53. Long-term storage of energy A) Carbohydrates. B) Proteins. C) Lipids. D) Nucleic acids. Show Answer Correct Answer: C) Lipids. 54. What SI unit is used to measure the number of representative particles in a substance? A) Ampere. B) Kelvin. C) Mole. D) Kilogram. Show Answer Correct Answer: C) Mole. 55. Which of the following is not a major function of protein? A) Provides structure for the body. B) Acts as a catalyst for chemical reactions in the form of enzymes. C) Provides energy for the body. D) All of the above are functions of protein. Show Answer Correct Answer: C) Provides energy for the body. 56. Diagrams that represent the valence electrons of atoms or molecules ..... A) Lewis Dot structures. B) Periodic table. C) Bohr diagrams. D) Atomic theory. Show Answer Correct Answer: A) Lewis Dot structures. 57. Which of the following changes is a physical change of matter? A) Water evaporating. B) Paper burning. C) A silver spoon tarnishing. D) A nail rusting. Show Answer Correct Answer: A) Water evaporating. 58. Acid rain is due to air pollution by? A) Methane. B) Carbon dioxide. C) Carbon monoxide. D) Nitrous oxide and Sulphur dioxide. Show Answer Correct Answer: D) Nitrous oxide and Sulphur dioxide. 59. Negatively charged particles found outside of the nucleus of an atom are called ..... A) Protons. B) Neutrons. C) Electrons. D) None of above. Show Answer Correct Answer: C) Electrons. 60. According the the modern atomic theory, it is nearly impossible to determines an electrons exact A) Mass. B) Color. C) Position. D) Charge. Show Answer Correct Answer: C) Position. ← PreviousNext →Related QuizzesScience QuizzesGeneral Knowledge QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books