This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry Basics > Chemistry – Quiz 27 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 27 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. This law states that energy cannot be created or destroyed, but it can change form. A) Endothermic reaction. B) Law of Conservation of EnergyLOCOE. C) Exothermic reaction. D) Law of Conservation of MatterLOCOM. Show Answer Correct Answer: B) Law of Conservation of EnergyLOCOE. 2. State change is always a ..... ..... A) Physical change. B) Physical property. C) Chemical change. D) Chemical property. Show Answer Correct Answer: A) Physical change. 3. Acetylene is burned in welding torches according to the following chemical reaction:2 C2H2 + 5 O2 $\rightarrow$ 4 CO2 + 2 H2OHow many oxygen (O) atoms are found in the reactants? A) 10. B) 5. C) 8. D) 2. Show Answer Correct Answer: A) 10. 4. What is the shape of H2O? A) Linear. B) Tetrahedral. C) Bent. D) Trigonal pyramidal. Show Answer Correct Answer: C) Bent. 5. Whichone of the following equations is correctly balanced? A) H2O $\rightarrow$3H2 + O2. B) H2 O $\rightarrow$ 2H2 + O2. C) 2H2O $\rightarrow$H2 + 4O2. D) 2H2O $\rightarrow$2H2 + O2. Show Answer Correct Answer: D) 2H2O $\rightarrow$2H2 + O2. 6. The property that describes how something looks (e.g. size, mass, texture, shape) and how it behaves around other substances (e.g. soluble, magnetic) A) Chemical. B) Physical. C) Appearance. D) Physique. Show Answer Correct Answer: B) Physical. 7. Mass Number = ..... A) No. of protons. B) No. of electrons. C) No. of neutrons. D) Protons + Neutrons. Show Answer Correct Answer: D) Protons + Neutrons. 8. Which of the following phase changes is exothermic? A) Melting. B) Freezing. C) Vaporization (evaporation). D) Sublimation. Show Answer Correct Answer: B) Freezing. 9. This particle determines what element you have-the elements identity. A) Electron. B) Proton. C) Neutron. D) Valence shell. Show Answer Correct Answer: B) Proton. 10. All molecules of the alkane homologous series have which ending in their name? A) -ane. B) -ene. C) -anol. D) -anoic acid. Show Answer Correct Answer: A) -ane. 11. Melting is ..... A) Liquid to solid. B) Solid to liquid. C) Solid to gas. D) Gas to liquid. Show Answer Correct Answer: B) Solid to liquid. 12. Which list does NOT contain compounds found in the same homologous series? A) Methane, ethane, propane, butane. B) Pentane, hexanol, heptane, octane. C) Nonane, decane, undecane, dodecane. D) Tridecane, tetradecane, pentadecane, hexadecane. Show Answer Correct Answer: B) Pentane, hexanol, heptane, octane. 13. What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)? A) 62.435g. B) 116.399g. C) 133.341g. D) 97.888g. Show Answer Correct Answer: C) 133.341g. 14. Water compound A) NaCl. B) H2O. C) Protein. D) CaCO. Show Answer Correct Answer: B) H2O. 15. In what type of bond are electrons gained or lost? This happens between a metal and a non-metal? A) Ionic. B) Covalent. C) Subatomic. D) None of above. Show Answer Correct Answer: A) Ionic. 16. The smallest basic unit of matter is the A) Molecule. B) Atom. C) Compound. D) Cell. Show Answer Correct Answer: B) Atom. 17. A type of mixture in which the composition of the mixture is the same all throughout. A) Intensive Mixture. B) Homogeneous Mixture. C) Extensive Mixture. D) Heterogeneous Mixture. Show Answer Correct Answer: B) Homogeneous Mixture. 18. Elements are found in the ..... (living things). A) Atmosphere. B) Hydrosphere. C) Biosphere. D) Lithosphere. Show Answer Correct Answer: C) Biosphere. 19. During a chemical reaction, if there is a release of energy, this type of reaction is called A) Endothermic. B) Exothermic. C) Elephant toothpate. D) Combustion. Show Answer Correct Answer: B) Exothermic. 20. Molecules are closest together in a A) Solid. B) Liquid. C) Gas. D) None of above. Show Answer Correct Answer: A) Solid. ← PreviousNext →Related QuizzesChemistry QuizzesScience 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