This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry Basics > Chemistry – Quiz 52 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 52 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Alters a substance without changing its composition A) Physical Change. B) Chemical Change. C) Chemical Reaction. D) Physical Reaction. Show Answer Correct Answer: A) Physical Change. 2. Which statement is correct about the enantiomers of a chiral compound? A) Their physical properties are different. B) All their chemical reactions are identical. C) A racemic mixture will rotate the plane of polarized light. D) They will rotate the plane of polarized light in opposite directions. Show Answer Correct Answer: D) They will rotate the plane of polarized light in opposite directions. 3. Alex wants to mix two substances together and to find out if a chemical reaction happens. What should he do? A) Test the solubility before and after mixing. B) Measure the volume before and after mixing. C) Measure the mass before and after mixing. D) Test the density of the before substance but not the after substances. Show Answer Correct Answer: A) Test the solubility before and after mixing. 4. When biomolecular subunits are joined together, what is produced or is a byproduct? A) Oil. B) Water. C) Protein. D) Sugar. Show Answer Correct Answer: B) Water. 5. What is it called when a liquid at times acts like a solid? A) Non-Newtonian substance. B) A gas substance. C) A watery substance. D) Non-liquid Seuss substance. Show Answer Correct Answer: A) Non-Newtonian substance. 6. Which of the following is an example of $ Heterogeneous\ Mixture$ . A) Oil & water. B) Salt & water. C) Sugar & water. D) None of above. Show Answer Correct Answer: A) Oil & water. 7. Which subatomic particle has a positive charge? A) Protons. B) Neutrons. C) Electrons. D) Nucleus. Show Answer Correct Answer: A) Protons. 8. Which equations represent the incomplete combustion of methane? I. CH4(g) + 2 O2(g) $\rightarrow$ CO2(g) + 2 H2O(g)II. CH4(g) + 1 1/2 O2(g) $\rightarrow$ CO(g) + 2 H2O(g)III. CH4(g) + O2(g) $\rightarrow$ C(s) + 2 H2O(g) A) I and II only. B) I and III only. C) II and III only. D) I, II and III. Show Answer Correct Answer: C) II and III only. 9. A ..... is a substance made of two or more DIFFERENT elements chemically combined. A) Mixture. B) Compound. C) Substance. D) None of above. Show Answer Correct Answer: B) Compound. 10. Physical properties of a substance include A) Color and odor. B) Melting and boiling points. C) Malleability. D) All of the above. Show Answer Correct Answer: D) All of the above. 11. The compound baking soda has a chemical formula of NaHCO3. How many elements are in one molecule of baking soda? A) 4. B) 12. C) 3. D) 6. Show Answer Correct Answer: A) 4. 12. If an atom has 10 electrons, how many protons does it have? A) 0. B) 1. C) 10. D) 5. Show Answer Correct Answer: C) 10. 13. The variables in an experiment that stay the same are the- A) Independent Variable. B) Dependent Variable. C) Constants/ Controls. D) None of above. Show Answer Correct Answer: C) Constants/ Controls. 14. What is the part of the chemical equation in green called? Fe + S $\rightarrow$ FeS A) Products. B) Reactants. C) Yield. D) Chemical formula. Show Answer Correct Answer: B) Reactants. 15. The mass per unit volume of a substance A) Matter. B) Density. C) Concentration. D) Mixture. Show Answer Correct Answer: B) Density. 16. If an alkane has 20 carbon atoms, how many hydrogen atoms will it have? A) 20. B) 22. C) 40. D) 42. Show Answer Correct Answer: D) 42. 17. What is the octet rule? How many valence electrons can the first three periods hold? A) 8. B) 2. C) 2 8 8. D) 2 8 16. Show Answer Correct Answer: C) 2 8 8. 18. What is the density of water? A) 0 g/ml. B) 1 g/ml. C) 10 g/ml. D) 100 g/ml. Show Answer Correct Answer: B) 1 g/ml. 19. One half the distance between the nuclei of two atoms of the same element when the atoms are joined. A) Electronegativity. B) Electron Affinity. C) Atomic Radius. D) First Ionization Energy. Show Answer Correct Answer: C) Atomic Radius. 20. Molar mass A) The volume occupied by 1 mole of a gas at standard temperature and pressure (STP); 22.4 L. B) Floating or sinking when compared to water. C) A colorless, odorless, highly flammable gas, the chemical element of atomic number 1. D) The mass of one mole of a pure substance. Show Answer Correct Answer: D) The mass of one mole of a pure substance. ← 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