This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 15 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What two molecules are located inside of the nucleus of an atom? A) Electrons and Neutrons. B) Protons and Electrons. C) Protons and Neutrons. D) None of above. Show Answer Correct Answer: C) Protons and Neutrons. 2. Unit cell of a crystal is defined by its ..... A) Dimension. B) Lattice points. C) End points. D) None of above. Show Answer Correct Answer: B) Lattice points. 3. Which of the following is not a compound? A) HCl. B) Cl. C) NaCl. D) CO2. Show Answer Correct Answer: B) Cl. 4. ..... discovered carbon. A) Al razi. B) J. Black. C) J. Priestly. D) Ibn e sina. Show Answer Correct Answer: B) J. Black. 5. Almost every situation you can imagine involves a chemist, because ..... A) Chemists are nosy. B) Everything is made of matter. C) Chemists are well-paid. D) Ozone depletion is a problem. Show Answer Correct Answer: B) Everything is made of matter. 6. Cm3 of 1.0 mol dm-3 hydrochloric acid is neutralized by 25cm3 of barium hydroxide solution. What is the molarity of barium hydroxide? A) 0.625 mol dm-3. B) 1.600 mol dm-3. C) 0.800 mol dm-3. D) 3.500 mol dm-3. Show Answer Correct Answer: C) 0.800 mol dm-3. 7. The ability of an atom to attract electrons when the atom is in a compound. A) First ionization energy. B) Electronegativity. C) Atomic radii. D) All of the above. Show Answer Correct Answer: B) Electronegativity. 8. In a covalent bond, electrons are A) Gained. B) Pulled apart. C) Shared. D) In the nucleus. Show Answer Correct Answer: C) Shared. 9. Which of the following is true about ammonia solution in methylbenzene? A) Has pH value more than 7. B) No change on red litmus paper. C) Ionises partially to produce hydroxide ions. D) Ammonium ions and hydroxide ions move freely in the solution. Show Answer Correct Answer: B) No change on red litmus paper. 10. How would you describe the way molecules move when the molecules are solid? A) The molecules are moving in place. B) The molecules are moving around each other. C) The molecules are moving away from each other. D) The molecules are not moving. Show Answer Correct Answer: A) The molecules are moving in place. 11. What is a mixture? A) A combination of elements to make a new substance. B) A chemically combined substance. C) A combination of substances where new substances are formed through a reaction. D) A combination of substances in which the atoms of the substance do not chemically combine. Show Answer Correct Answer: D) A combination of substances in which the atoms of the substance do not chemically combine. 12. What is the correct name of the compound NO2? A) Nitrogen oxide. B) Mononitrogen dioxide. C) Nitrogen dioxide. D) Dinitrogen monoxide. Show Answer Correct Answer: C) Nitrogen dioxide. 13. How many electrons should Beryllium have around its Lewis dot model? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 14. In any physical or chemical change, mass is ..... A) Created. B) Destroyed. C) Conserved. D) Changed. Show Answer Correct Answer: C) Conserved. 15. In the chemicalsymbol for nitrogen gas, N2, what does the "2" represent? A) Two nitrogen compounds. B) Two nitrogen atoms. C) Two types of nitrogen gas. D) Two nitrogen symbols. Show Answer Correct Answer: B) Two nitrogen atoms. 16. What is green chemistry? A) The utilization of a set of guidelines that increases or adds the use or generation of hazardous substances in the design, manufacture and application of chemical products. B) The utilization of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. C) A form of chemistry that focuses on how the color green was chemically formed and its components. D) None of above. Show Answer Correct Answer: B) The utilization of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. 17. Mixtures are separated through ..... changes. A) Mixture. B) Compound. C) Physical. D) None of above. Show Answer Correct Answer: C) Physical. 18. Which substance is a compound? A) SiH3. B) SiH3. C) Sih3. D) Sih3. Show Answer Correct Answer: A) SiH3. 19. The boiling point ofthe water is an example of which of the following? A) Physical change. B) Chemical change. C) Physical property. D) Chemical property. Show Answer Correct Answer: C) Physical property. 20. Which of these is NOT a pure substance? A) Elements. B) Compounds. C) Mixtures. D) They are all pure substances. Show Answer Correct Answer: C) Mixtures. ← 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