This quiz works best with JavaScript enabled. Home > General Knowledge > Science > Chemistry > Chemistry – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 18 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is a definition of a molecule? A) Group of atoms chemically bonded together. B) Group of electrons held together. C) Group of protons held together. D) Group of neutrons held together. Show Answer Correct Answer: A) Group of atoms chemically bonded together. 2. Which of the following is NOT soluble in water? A) Sugars. B) Salts. C) Ions. D) Lipids. Show Answer Correct Answer: D) Lipids. 3. Average atomic mass of cesium is 133. what is the mass of 3 mol? A) 133. B) 266. C) 399. D) .133. Show Answer Correct Answer: C) 399. 4. How many total electrons does Na+1 (a sodium ion) have? A) 12. B) 11. C) 10. D) 22. Show Answer Correct Answer: C) 10. 5. Which subatomic part of an atom gives it a positive charge? A) Nucleus. B) Electron. C) Neutron. D) Proton. Show Answer Correct Answer: D) Proton. 6. This is a type of mixture where one substance dissolves into another A) Miscibility. B) Compound. C) Solubility. D) Solution. Show Answer Correct Answer: D) Solution. 7. Hydrogen gas (H2) is an example of a A) Molecule. B) Compound. C) Both a molecule and a compound. D) None of above. Show Answer Correct Answer: A) Molecule. 8. Protons have a ..... charge. A) Negative. B) Positive. C) Neutral. D) None of above. Show Answer Correct Answer: B) Positive. 9. This monosaccharide is not involved in energy production but the structural components of the nucleic acids A) Glucose. B) Fructose and galactose. C) Sucrose. D) Deoxyribose. Show Answer Correct Answer: D) Deoxyribose. 10. Which scientist described a positively charged core ("nucleus" ) in the middle of a lot of empty space? A) Bohr. B) Chadwick. C) Thomson. D) Rutherford. Show Answer Correct Answer: D) Rutherford. 11. As the temperature goes up, the solubility of all solids in water A) Remains the same. B) Increases. C) It depends upon the solid. D) Decreases. Show Answer Correct Answer: B) Increases. 12. Chemical used in photography is A) Sodium thiosulphate. B) Sodium oxalate. C) Sodium sulphite. D) Sodium sulphate. Show Answer Correct Answer: A) Sodium thiosulphate. 13. What is the smallest 'building block' of the elements that make up the universe? A) An electron. B) A cell. C) A proton. D) An atom. Show Answer Correct Answer: D) An atom. 14. A compound has the formula Al2O3 . What are the correct number of elements in the formula? A) 2 x Aluminium, 3 x oxide. B) 2 x Ammonium, 3 x oxygen. C) 2 x Ammonium, 3 x oxide. D) 2 x aluminium, 3 x oxygen. Show Answer Correct Answer: D) 2 x aluminium, 3 x oxygen. 15. A heterogenous mixture can be separated by all of the methods EXCEPT, A) Decantation. B) Mechanical separation. C) Filtration. D) Distillation. Show Answer Correct Answer: A) Decantation. 16. Which would have a greater mass, 6.02 x 1023 atoms of H or 6.02 x 1023 atoms of He? A) 6.02 x 1023. B) 6.02 x 1023 atoms of He. C) 6.02 x 1023 atoms of H. D) They are the same. Show Answer Correct Answer: B) 6.02 x 1023 atoms of He. 17. Pure substance made up of two or more elements that have been chemically combined ( ionic bond), and have a fixed ratio. A) Element. B) Compound. C) Molecule. D) Mixture. Show Answer Correct Answer: B) Compound. 18. Water drops are spherical because of? A) Polarity. B) Density. C) Viscosity. D) Surface tension. Show Answer Correct Answer: D) Surface tension. 19. Elements that show the properties of both metals and non metals are called? A) Alloys. B) Colloids. C) Allotropes. D) Metalloids. Show Answer Correct Answer: D) Metalloids. 20. Which of the following cannot be broken down by ordinary chemical means? A) Molecule. B) Element. C) Compound. D) Bond. Show Answer Correct Answer: B) Element. 21. The mass of a mole of NaCl is the A) Atomic mass. B) Molar mass. C) Molecular mass. D) Compound mass. Show Answer Correct Answer: B) Molar mass. 22. Science that deals with, matter, its composition, structure and properties, the changes it undergoes, and the energy accompanying the changes between them. A) Chemistry. B) Physics. C) Biology. D) None of above. Show Answer Correct Answer: A) Chemistry. 23. Which of the following can directly affect the movement of particles? A) Temperature. B) Heat. C) Energy. D) Pressure. Show Answer Correct Answer: A) Temperature. 24. Modern Periodic Table me kitne group hain A) 05. B) 07. C) 04. D) 18. Show Answer Correct Answer: D) 18. 25. When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have? A) Oxygen has 16 grams of atoms. B) Sulfur has 32.06 grams of atoms. C) Both contains 6.02 x 1023 atoms. D) Can be determined. Show Answer Correct Answer: C) Both contains 6.02 x 1023 atoms. 26. How many moles of copper are 4.57 x 1013 atoms of copper? A) 7.59 x 1011 moles. B) 2.75 x 1033 moles. C) 2.75 x 1037 moles. D) 7.59 x 10-11 moles. Show Answer Correct Answer: D) 7.59 x 10-11 moles. 27. In the modern periodic table elements are arranged by A) Valence electrons. B) Atomic mass. C) Number of isotopes. D) Atomic number. Show Answer Correct Answer: D) Atomic number. 28. What subatomic particle is negatively charged? A) Neutrons. B) Protons. C) Electrons. D) Solution. Show Answer Correct Answer: C) Electrons. 29. Which of these statements is true of the scientific method? A) Working scientists rarely use it. B) The steps may vary somewhat to suit the experiment. C) Scientists must follow its steps exactly. D) Scientists rarely publish results of experiments. Show Answer Correct Answer: B) The steps may vary somewhat to suit the experiment. 30. A change in the size, shape, or state of matter. A) Chemical change. B) Electron change. C) Physical change. D) Chemical reaction. Show Answer Correct Answer: C) Physical change. 31. How many quarks do the electron have? A) 2 up quarks and 1 down quark. B) 1 up quark and 2 down quarks. C) 1 up quark and 5 down quarks. D) None of above. Show Answer Correct Answer: C) 1 up quark and 5 down quarks. 32. It exist between polar molecules. A) Hydrogen bond. B) Dipole dipole forces. C) London dispersion forces. D) Ion dipole forces. Show Answer Correct Answer: B) Dipole dipole forces. 33. In the periodic table, what does C stand for? A) Carbon. B) Cat. C) Calcium. D) Crypton. Show Answer Correct Answer: A) Carbon. 34. Why is phosphorus kept under water? A) To save it from catching fire when exposed to dry air. B) To make it durable. C) To make it wet. D) Water forms a protective coating on it. Show Answer Correct Answer: A) To save it from catching fire when exposed to dry air. 35. Symbol for silver in periodic table is A) Au. B) Al. C) Na. D) Ag. Show Answer Correct Answer: D) Ag. 36. Which is the correct general formula for ketones? A) CnH2n+1CO. B) CnH2n+2O. C) CnH2nO. D) CnH2n+1O. Show Answer Correct Answer: C) CnH2nO. 37. Which of these elements forms a molecular solid? A) Mercury. B) Iodine. C) Florine. D) Copper. Show Answer Correct Answer: B) Iodine. 38. Which one of the following characteristics is INCORRECT for all of the members of the same homologous series? A) Similar chemical properties, i.e. undergo the same reactions. B) Varying physical properties, i.e. change in a predictable way. C) Same general formula. D) Same ratio of atoms. Show Answer Correct Answer: D) Same ratio of atoms. 39. If I pour the water off after I boil the banana, this method is an example of ..... A) Filtration. B) Mechanical separation. C) Decantation. D) Distillation. Show Answer Correct Answer: C) Decantation. 40. Everywhere in the universe an object's ..... is the same. A) Volume. B) Weight. C) Friction. D) Mass. Show Answer Correct Answer: D) Mass. 41. Identify the Electron Configuration for Aluminum (Al) A) 1s2 2s2 2p6 3s2 3p1. B) 1s2 2s2 2p6 3s2 4p1. C) 1s2 2s2 2p6 3s2 3p3. D) None of above. Show Answer Correct Answer: A) 1s2 2s2 2p6 3s2 3p1. 42. How many sig figs are in 807 A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: C) 3. 43. Which Russian scientist created the first Periodic Table in 1896? A) Avogadro. B) Mendeleev. C) Rutherford. D) Moseley. Show Answer Correct Answer: B) Mendeleev. 44. In which group are the halogens found? A) 1. B) 3-12. C) 18. D) 17. Show Answer Correct Answer: D) 17. 45. Liter converts to A) .01 kL. B) .001 mL. C) 1000 mL. D) 100 mL. Show Answer Correct Answer: C) 1000 mL. 46. The substance of specific properties that do not depend on the amount of substance. A) Physical properties. B) Extensive properties. C) Chemical properties. D) Intensive properties. Show Answer Correct Answer: D) Intensive properties. 47. Which type of reaction is:2 H3AsO4 $\rightarrow$ As2O5 + 3 H2O A) Combustion. B) Synthesis. C) Single Displacement. D) Decomposition. Show Answer Correct Answer: D) Decomposition. 48. Ionic bonds are chemical bonds formed by the A) Transfer of electrons from one atom to another. B) Donation of protons from one atom to another. C) Sharing of electrons between molecules. D) Acceptance of neutrons from one atom by another. Show Answer Correct Answer: A) Transfer of electrons from one atom to another. 49. Which biomolecule is responsible for insulation and energy storage? A) Nucleic Acid. B) Lipid. C) Protein. D) Carbohydrate. Show Answer Correct Answer: B) Lipid. 50. A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass A) Orbitals. B) Electron Cloud. C) Electron Shells. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 51. A(n) ..... is a charged particle that forms when an atom gains or loses electrons A) Isotope. B) Reaction. C) Bond. D) Ion. Show Answer Correct Answer: D) Ion. 52. Si + S8 $\rightarrow$ Si2S4 A) Synthesis (combination). B) Decomposition. C) Single replacement. D) Double replacement. Show Answer Correct Answer: A) Synthesis (combination). 53. Atoms that gain & lose electrons are called ..... A) Radioactive. B) Isotopes. C) Ions. D) Corrosive. Show Answer Correct Answer: C) Ions. 54. How many electrons are in the outer shell of sodium A) 01. B) 08. C) 05. D) 11. Show Answer Correct Answer: A) 01. 55. CCl4 has a higher boiling point than HCl. This is due to ..... in CCl4. A) Polar bonds. B) Hydrogen bonding. C) Strong London dispersion forces. D) Symmetry of CCl4. Show Answer Correct Answer: C) Strong London dispersion forces. 56. ..... are the COLUMNS on the periodic table and are organized by similar properties. A) Classifications. B) Periods. C) Elements. D) Groups. Show Answer Correct Answer: D) Groups. 57. What is the atomic mass for Arsenic? A) 108. B) 76. C) 75. D) 33. Show Answer Correct Answer: C) 75. 58. In dehydration synthesis A) Water is removed to form bonds between monomers. B) Water is removed to break bonds between monomers. C) Water is added to break bonds between monomers. D) Water is added to form bonds between monomers. Show Answer Correct Answer: A) Water is removed to form bonds between monomers. 59. A ..... mixture is one that does not have a uniform composition A) Heterogeneous. B) Homogeneous. C) Pure substance. D) None of above. Show Answer Correct Answer: A) Heterogeneous. 60. Which of the following is NOT a common sign that a chemical change has take place? A) Foaming or bubbling. B) Production of heat or light. C) Change in state. D) Change in color or odor. Show Answer Correct Answer: C) Change in state. ← 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