This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 38 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 38 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The boiling point of water is a physical property and not a chemical property because- A) When water is heated to its boiling point, it changes into a new substance with new properties. B) When water is cooled to its boiling point, it changes from a solid to a liquid and has new properties. C) When water is heated to its boiling point, it changes from a liquid to a solid and only changes how it reacts with other substances. D) When water is heated to its boiling point, it changes from a liquid to a gas without changing into a new substance. Show Answer Correct Answer: D) When water is heated to its boiling point, it changes from a liquid to a gas without changing into a new substance. 2. Compared to ionic compounds, ..... generally have lower melting points and boiling points A) Elemental. B) Bonded. C) Double-bonded. D) Covalent. Show Answer Correct Answer: D) Covalent. 3. A neutral species that has an unpaired electron is called a ..... A) Electrophile. B) Nucleophile. C) Carbanion. D) Free radical. Show Answer Correct Answer: D) Free radical. 4. Chemical reactions that absorb more energy than they release are called A) Exothermic. B) Catalyzed. C) Endothermic. D) Activated. Show Answer Correct Answer: C) Endothermic. 5. Which property of Group 18 elements increases when going down the Group in the Periodic Table? A) Forces of attraction. B) Reactivity. C) Solubility in water. D) Electrical conductivity. Show Answer Correct Answer: A) Forces of attraction. 6. Halogenoalkanes can undergo SN1 and SN2 reactions with aqueous sodium hydroxide. Which halogenoalkane will react fastest with a 0.1 moldm-3 solution of aqueous sodium hydroxide? A) 2-chloro-2-methylpropane. B) 2-iodo-2-methylpropane. C) 1-chlorobutane. D) 1-iodobutane. Show Answer Correct Answer: B) 2-iodo-2-methylpropane. 7. CI A) Chlorine g.17 p.5. B) Chlorine g.3 p.17. C) Chlorine g.17 p3. D) None of above. Show Answer Correct Answer: C) Chlorine g.17 p3. 8. How many atoms of oxygen are in a molecule of Ca3(PO4)2 A) 1. B) 2. C) 4. D) 8. Show Answer Correct Answer: D) 8. 9. Phase change from a solid to a liquid. A) Melting. B) Sublimation. C) Boiling. D) Condensation. Show Answer Correct Answer: A) Melting. 10. Which of the following is NOT a chemical reaction? A) Burning a marshmallow in a campfire. B) A campfire. C) Acid rain turning a copper roof green. D) Dissolving red Koolaid in water. Show Answer Correct Answer: D) Dissolving red Koolaid in water. 11. How many valence electrons are in Phosphorus? A) 15. B) 4. C) 5. D) 31. Show Answer Correct Answer: C) 5. 12. The reaction to form proteins from amino acids is called A) Hydrolysis. B) Condensation. C) Esterification. D) None of above. Show Answer Correct Answer: B) Condensation. 13. Which of the following branches of chemistry involves the study of making of glass and fibers? A) Industrial chemistry. B) Biological chemistry. C) Organic chemistry. D) Inorganic chemistry. Show Answer Correct Answer: A) Industrial chemistry. 14. A pure substance that is a compound is made out of A) Particles of more than one type of atom. B) Particles of the same type of atom. C) A mixture of two or more substances that can be physically separated. D) None of above. Show Answer Correct Answer: A) Particles of more than one type of atom. 15. A hydrocarbon is made of only A) Carbon and hydrogen and oxygen. B) Carbon and hydrogen. C) Fluorine and carbon. D) Carbon. Show Answer Correct Answer: B) Carbon and hydrogen. 16. A block has a mass of 54g and a volume of 20.0cm3. What is the density of the block? A) 74 g/cm3. B) 1080 g/cm3. C) 34 g/cm3. D) 2.7 g/cm3. Show Answer Correct Answer: D) 2.7 g/cm3. 17. Provides evidence that a chemical reaction has occurred. A) Dissolving. B) Melting. C) Formation of a gas. D) Bending. Show Answer Correct Answer: C) Formation of a gas. 18. What is a precipitate? A) A change in color. B) A change in temperature. C) A solid formed. D) A gas formed. Show Answer Correct Answer: C) A solid formed. 19. Property that carry out changes in the composition of a substance. A) Extensive Property. B) Chemical Property. C) Physical Property. D) Intensive Property. Show Answer Correct Answer: B) Chemical Property. 20. When two substances were combined together, heatwas given off and the color of the combined materials changed. What hashappened? A) A conversion. B) A fire. C) A nuclear event. D) A chemical reaction. Show Answer Correct Answer: D) A chemical reaction. ← 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