This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 41 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 41 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What property of water allows insects to walk upon it? A) Adhesion. B) Surface tension. C) High heat capacity. D) None of above. Show Answer Correct Answer: B) Surface tension. 2. Which of the following is the CORRECT chemical name of Li2S? A) Lithium Sulfite. B) Lithium Sulfide. C) Lithium II Sulfur. D) Lithium sulfate. Show Answer Correct Answer: B) Lithium Sulfide. 3. Semiconductors are elements that A) Have large atomic mass but small atomic numbers. B) Do not form compounds. C) Conduct heat and electricity under certain conditions. D) Are extremely hard. Show Answer Correct Answer: C) Conduct heat and electricity under certain conditions. 4. The atomic number is the number of ..... in the nucleus of an atom. A) Protons. B) Neutrons. C) Electrons. D) None of above. Show Answer Correct Answer: A) Protons. 5. Which phrase best describes atoms? A) Smallest basic units of matter. B) Parts of a nucleus. C) Single-celled organism. D) Positively charged particles. Show Answer Correct Answer: A) Smallest basic units of matter. 6. The tendency of an atom to prefer to have 8 electrons in the valence shell is known as A) Octet. B) Duplet. C) Valency. D) None of the above. Show Answer Correct Answer: A) Octet. 7. Which of the folowing concentration term is affected by temperature A) Molarity. B) Molality. C) Molefraction. D) None of these. Show Answer Correct Answer: A) Molarity. 8. Which type of reaction is:C7H16 + 10 O2 $\rightarrow$ 7 CO2 + 8 H2O A) Synthesis. B) Decomposition. C) Single Displacement. D) Combustion. Show Answer Correct Answer: D) Combustion. 9. What fundamental quantities are needed to determine density? A) Weight and area. B) Weight and volume. C) Mass and area. D) Mass and volume. Show Answer Correct Answer: D) Mass and volume. 10. Gibbs free energy is denoted by what letter which this energy is a combination of enthalpy and entropy in a single value. A) G. B) H. C) K. D) KJ. Show Answer Correct Answer: A) G. 11. ..... protons ..... neutrons ..... electrons A) -, 0, +. B) 0, +,. C) +, 0,. D) +, -, 0. Show Answer Correct Answer: C) +, 0,. 12. How many total ELEMENTS are in the following compound:2C2H4O2 A) 3. B) 8. C) 10. D) 16. Show Answer Correct Answer: A) 3. 13. The symbol for Fluorine A) Fl. B) Fe. C) F. D) Already. Show Answer Correct Answer: C) F. 14. Which one is an organic Acid? A) Citric. B) Nitric. C) Sulphuric. D) Phosphoric. Show Answer Correct Answer: A) Citric. 15. What are the building blocks of MATTER? A) Atoms. B) Cells. C) Protons. D) Neutrons. Show Answer Correct Answer: A) Atoms. 16. An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have? A) 0. B) 7. C) 6. D) 13. Show Answer Correct Answer: C) 6. 17. The aqueous solution of which acids is called Vinegar? A) Acetic acid. B) Citric acid. C) Oxalic acid. D) Hydrochloric acid. Show Answer Correct Answer: A) Acetic acid. 18. An orbital can at most hold how many electrons? A) 1 electron. B) 2 electrons. C) 3 electrons. D) 4 electrons. Show Answer Correct Answer: B) 2 electrons. 19. In the chemical equation below, what substance(s) is/are the product(s) of the reaction:Na + Cl2 $\rightarrow$NaCl A) Na. B) Na & Cl2. C) Cl2. D) NaCl. Show Answer Correct Answer: D) NaCl. 20. Using the following equation:Fe2O3(s) + 3H2(g) $\rightarrow$ 2Fe(s) + 3H2O(l)How many moles of iron can be made from 6 moles H2? A) 4 moles Fe. B) 6 moles Fe. C) 9 moles Fe. D) 2 moles Fe. Show Answer Correct Answer: A) 4 moles Fe. ← PreviousNext →Related QuizzesScience QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8Chemistry Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books