This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 50 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 50 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. 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. 4. 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. 5. 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. 6. The mass per unit volume of a substance A) Matter. B) Density. C) Concentration. D) Mixture. Show Answer Correct Answer: B) Density. 7. 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. 8. 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. 9. 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. 10. 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. 11. 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. 12. Durning a phase change the temperature of a substance ..... A) Always increases. B) Always decreases. C) Always stays the same. D) Varies. Show Answer Correct Answer: C) Always stays the same. 13. Graphene sheets burn at A) A higher temperature than graphite. B) The same temperature as graphite. C) A lower temperature than graphite. D) None of above. Show Answer Correct Answer: C) A lower temperature than graphite. 14. Some dog foods contain corn and wheat that provide the dog with carbohydrates. Why are carbohydrates important to cell processes? A) They make amino acids. B) They form cell membranes. C) They are a source of energy. D) They help chemical processes happen. Show Answer Correct Answer: C) They are a source of energy. 15. Which are the following are used to make detergents? i. petroleumii. fats or oils.iii. sodium hydroxideiv. glycerol A) Ii and i. B) I and iv. C) I and iii. D) Iii and iv. Show Answer Correct Answer: C) I and iii. 16. How many principles does green chemistry implement? A) 10. B) 11. C) 12. D) 14. Show Answer Correct Answer: C) 12. 17. A(n) ..... includes the symbol for the element surrounded by dots. A) Element symbol. B) Clarence symbol. C) Lewis symbol. D) Bohr symbol. Show Answer Correct Answer: C) Lewis symbol. 18. While working on an activity to investigate chemical reactions, a student mixes two clear liquids in a beaker. When the two liquids mix, the result is a clear liquid and an orange solid precipitate. Which best describes the reactants that the student worked with? A) The initial two clear liquids. B) The resulting clear liquid and the beaker. C) The orange solid precipitate. D) All of the above. Show Answer Correct Answer: A) The initial two clear liquids. 19. A quality or condition of a substance that can be observed or measured without changing the substance's composition. A) Chemical property. B) Physical property. C) Specific heat capacity. D) Refractive index. Show Answer Correct Answer: B) Physical property. 20. What type of bond occurs between atoms that share electrons? A) Covalent. B) Ionic. C) Hydrogen. D) None of above. Show Answer Correct Answer: A) Covalent. ← 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