This quiz works best with JavaScript enabled. Home > General Knowledge > Science > Chemistry > Chemistry – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why is it important to have a balanced chemical equation? A) To show conservation of mass. B) To show there are different compounds on each side. C) To prove that matter disappears. D) None of above. Show Answer Correct Answer: A) To show conservation of mass. 2. Molecules that do not contain Carbon A) Hydrophobic. B) Hydrophylic. C) Inorganic. D) Organic. Show Answer Correct Answer: C) Inorganic. 3. The outermost level of electrons in an atom is called A) Electrons. B) Protons. C) Valence Electrons. D) Neutrons. Show Answer Correct Answer: C) Valence Electrons. 4. Neutral solutions have a pH of ..... A) 7. B) 0. C) 8-14. D) 1-6. Show Answer Correct Answer: A) 7. 5. What happens when LiCl(s) is dissolved in water? A) No attractions are involved. B) Li+ ions are attracted to the hydrogen atoms in water. C) Cl-ions are attracted to the oxygen atoms in water. D) Li+ ions are attracted to the oxygen atoms in water. Show Answer Correct Answer: D) Li+ ions are attracted to the oxygen atoms in water. 6. Which element ISN'T used by life? A) Carbon. B) Hydrogen. C) Oxygen. D) Uranium. Show Answer Correct Answer: D) Uranium. 7. The cyclotron is used to A) Making alloys. B) Purifying metals. C) Separating elements. D) Accelerating particles. Show Answer Correct Answer: D) Accelerating particles. 8. Which macromolecule basic unit is glycerol and fatty acids? A) Proteins. B) Nucleic acids. C) Carbohydrates. D) Lipids. Show Answer Correct Answer: D) Lipids. 9. Who proposed first atomic theory? A) Rutherford. B) John Dalton. C) I.Mendeleef. D) De Broglie. Show Answer Correct Answer: B) John Dalton. 10. What is the shorthand electron configuration for Sulfur atom? A) [Na] 3s23p3. B) [He] 3s23p4. C) [Ar] 3p4. D) [Ne] 3s23p4. Show Answer Correct Answer: D) [Ne] 3s23p4. 11. Increase in temperature of the reactants can do one of the following A) Slow collision frequency. B) Allow less effective collision between the particles. C) Neutralise the reaction. D) Increase collision between the particles thus increasing the rate. Show Answer Correct Answer: D) Increase collision between the particles thus increasing the rate. 12. The actual amount of product in a chemical reaction A) Theoretical yield. B) Actual yield. C) Yield. D) Percent yield. Show Answer Correct Answer: B) Actual yield. 13. Which is the smallest part of an element that retains all the properties of the element? A) Atom. B) Electron. C) Neutron. D) Proton. Show Answer Correct Answer: A) Atom. 14. A negatively charged ion is called ..... A) Electron. B) Cation. C) Anion. D) Proton. Show Answer Correct Answer: C) Anion. 15. How many molecules are in 32.4 grams of phosphorous pentoxide? A) 0.29 moles. B) 1.76 x 1022 molecules. C) 1.76 x 1023 molecules. D) 0.29 molecules. Show Answer Correct Answer: C) 1.76 x 1023 molecules. 16. Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The reactants in this reactions are A) Magnesium and magnesium chloride. B) Hydrochloric acid and hydrogen gas. C) Magnesium and hydrochloric acid. D) Magnesium chloride and hydrogen gas. Show Answer Correct Answer: C) Magnesium and hydrochloric acid. 17. The mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom A) Atomic number. B) Element symbol. C) Element name. D) Atomic mass. Show Answer Correct Answer: D) Atomic mass. 18. The direct source of energy for cells is usually A) Fats. B) DNA. C) Glucose. D) Protein. Show Answer Correct Answer: C) Glucose. 19. How many electrons should Magnesium have around its Lewis dot model? A) 4. B) 2. C) 3. D) 1. Show Answer Correct Answer: B) 2. 20. What particle uniquely identifies an element? A) Number of Protons. B) Number of Valence Electrons. C) Number of Electrons. D) Atomic Mass. Show Answer Correct Answer: A) Number of Protons. 21. Which of these reactions is a combustion reaction? A) Production of food by plants with the help of the Sun's energy. B) Rotting of fruits and vegetables. C) Burning wood. D) None of above. Show Answer Correct Answer: C) Burning wood. 22. The number 6.022 x 1023 is called ..... A) Buckley's number. B) Avogadro's number. C) Bohr's number. D) A dozen. Show Answer Correct Answer: B) Avogadro's number. 23. What state of matter has both a definite shape and volume? A) Solid. B) Liquid. C) Gas. D) Plasma. Show Answer Correct Answer: A) Solid. 24. These are forces between atoms and molecules of pure substances ..... A) London Dispersion Forces. B) Van der Waals Forces. C) Intermolecular Forces. D) Coulombic Forces. Show Answer Correct Answer: B) Van der Waals Forces. 25. What is the number of moles in 11 grams of CO2. A) .025. B) 4.0. C) 44. D) 0.25. Show Answer Correct Answer: D) 0.25. 26. What is an atom? A) A positively charged particle. B) The smallest unit of an element. C) A thing the contains matter. D) A negatively charged particle. Show Answer Correct Answer: B) The smallest unit of an element. 27. Why is it important that electrolytes are kept at the correct concentration? A) To keep you awake in lectures. B) So that you can you can become a super hero. C) To maintain cell transport and function, hydration, muscle and nerve cell function and blood pressure etc. D) To live forever. Show Answer Correct Answer: C) To maintain cell transport and function, hydration, muscle and nerve cell function and blood pressure etc. 28. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is A) Limonene. B) Engenol. C) Geraniol. D) Cineole. Show Answer Correct Answer: D) Cineole. 29. Which of the following are the sub-atomic particles of an atom? A) Proton, Neutron, and Electron. B) Proton, Electron, and Quarks. C) Proton, atomic number, and atomic mass. D) None of above. Show Answer Correct Answer: A) Proton, Neutron, and Electron. 30. How would you neutralize a weak base? A) A weak acid. B) A strong acid. C) A strong base. D) Water. Show Answer Correct Answer: A) A weak acid. 31. The temperature at which a substance changes from solid to liquid. A) Dripping point. B) Boiling point. C) Warming point. D) Melting point. Show Answer Correct Answer: D) Melting point. 32. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is A) Oxygen. B) Helium. C) Methane. D) Ozone. Show Answer Correct Answer: D) Ozone. 33. Which of the following is NOT a state of matter? A) Solid. B) Liquid. C) Gas. D) Mass. Show Answer Correct Answer: D) Mass. 34. Which activity below does not represent a chemical change? A) Burning logs. B) Decaying leaves. C) Ripening pear. D) Melting ice cubes. Show Answer Correct Answer: D) Melting ice cubes. 35. An element with one electron in its outermost shell will generally form ..... bond. A) Ionic. B) Metallic. C) Covalent. D) None of above. Show Answer Correct Answer: A) Ionic. 36. What is a particle? A) A very small piece of something. B) A planet. C) A part of a machine. D) Anything that has mass and takes up space. Show Answer Correct Answer: A) A very small piece of something. 37. It is defined as how much substance dissolves in a given volume of liquid. A) Solubility. B) Density. C) Electric property. D) Magnetic property. Show Answer Correct Answer: A) Solubility. 38. Which of these is a property of metals? A) It's malleable. B) It can't conduct electricity. C) They are used in food. D) It's very brittle. Show Answer Correct Answer: A) It's malleable. 39. =The main active constituent of tea and coffee is A) Nicotine. B) Caffeine. C) Chlorophyll. D) Aspirin. Show Answer Correct Answer: B) Caffeine. 40. We know that air is a mixture and not a compound because A) It can be heated to a higher temperature. B) It can be compressed to a smaller volume. C) It is colorless. D) Its composition can vary. Show Answer Correct Answer: D) Its composition can vary. 41. Balance the following: ..... Al + ..... O2 $\rightarrow$ ..... Al2O3 A) 4, 3, 2. B) 2, 3, 4. C) 2, 1, 1. D) 1, 1, 2. Show Answer Correct Answer: A) 4, 3, 2. 42. The amount of matter in an object is its A) Volume. B) Mass. C) Density. D) Weight. Show Answer Correct Answer: B) Mass. 43. What do you call two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons? A) Neuron. B) Isotope. C) Anion. D) Cation. Show Answer Correct Answer: B) Isotope. 44. How many electrons are found in the 2nd energy level? A) 2. B) 8. C) 16. D) None of above. Show Answer Correct Answer: B) 8. 45. Which macromolecule stores energy and makes up the cell membrane? A) Carbohydrates. B) Nucleic acids. C) Proteins. D) Lipids. Show Answer Correct Answer: D) Lipids. 46. What do you call this attractive force holding particles together in the condensed phases of matter? A) Intermolecular Force. B) Coulombic Attraction. C) Van der Waals Forces. D) London Dispersion Force. Show Answer Correct Answer: A) Intermolecular Force. 47. It includes flammability, toxicity, reactivity to water and oxygen like rusting, heat combustion etc. A) Matter. B) Chemical properties. C) Physical properties. D) Phase transition. Show Answer Correct Answer: B) Chemical properties. 48. The positively charged subatomic particle contained in the nucleus of an atom A) Electron. B) Proton. C) Neutron. D) Matter. Show Answer Correct Answer: B) Proton. 49. What type of charge does a neutron have? A) Positive. B) Negative. C) Neutral. D) None of above. Show Answer Correct Answer: C) Neutral. 50. When water is heated, the amount of solid that can be dissolved in it A) Increases. B) Decreases. C) Remains the same. D) None of above. Show Answer Correct Answer: A) Increases. 51. What is a reactant? A) The substances that are formed by a chemical reaction. B) A volatile chemical. C) The substances you start with in a chemical reaction. D) A dangerous substance. Show Answer Correct Answer: C) The substances you start with in a chemical reaction. 52. How many protons are in the nucleus of an atom with an atomic number of 15? A) 15 protons. B) 30 protons. C) 10 protons. D) None of above. Show Answer Correct Answer: A) 15 protons. 53. What trend does atomic radius follow as you move down the families on the Periodic Tables A) Decreases. B) Increases. C) Remains the same. D) None of above. Show Answer Correct Answer: B) Increases. 54. A 10.0 gram of water sample decomposes into 1.11 grams of H2 and 8.89 grams of O2. Which law supports this? A) Law of definite proportions. B) Law of constant composition. C) Law of conservation of mass. D) Law of multiple proportions. Show Answer Correct Answer: C) Law of conservation of mass. 55. The charge on an electron is A) Negative. B) Positive. C) Neutral. D) Dependent on the atomic number. Show Answer Correct Answer: A) Negative. 56. The dissolved materials in a solution A) Solvent. B) Solute. C) Saturated solution. D) Solution. Show Answer Correct Answer: B) Solute. 57. How many molecules of sugar (C6H12O6) are in one mole? A) 6.02 x 1023 molecules. B) 180 molecules. C) 24 molecules. D) 180 g. Show Answer Correct Answer: A) 6.02 x 1023 molecules. 58. When an atom loses electrons it becomes A) A positive ion. B) A negative ion. C) Both positive and negative ion. D) A neutral ion. Show Answer Correct Answer: A) A positive ion. 59. Contact lenses are made from? A) Polystyrene. B) Teflon. C) Lucite. D) Polyvinyl chloride. Show Answer Correct Answer: D) Polyvinyl chloride. 60. The beta particle has a charge of ..... A) -2. B) +4. C) +1. D) -1. Show Answer Correct Answer: B) +4. 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