This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 1 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why is it important to have a balanced chemical equation? A) To show conservation of mass. B) To show there are different compounds on each side. C) To prove that matter disappears. D) None of above. Show Answer Correct Answer: A) To show conservation of mass. 2. Molecules that do not contain Carbon A) Inorganic. B) Organic. C) Hydrophobic. D) Hydrophylic. Show Answer Correct Answer: A) Inorganic. 3. The outermost level of electrons in an atom is called A) Valence Electrons. B) Electrons. C) Protons. D) Neutrons. Show Answer Correct Answer: A) Valence Electrons. 4. Neutral solutions have a pH of ..... A) 1-6. B) 7. C) 8-14. D) 0. Show Answer Correct Answer: B) 7. 5. What happens when LiCl(s) is dissolved in water? A) Cl-ions are attracted to the oxygen atoms in water. B) Li+ ions are attracted to the hydrogen atoms in water. C) Li+ ions are attracted to the oxygen atoms in water. D) No attractions are involved. Show Answer Correct Answer: C) Li+ ions are attracted to the oxygen atoms in water. 6. Which element ISN'T used by life? A) Carbon. B) Uranium. C) Hydrogen. D) Oxygen. Show Answer Correct Answer: B) Uranium. 7. The cyclotron is used to A) Making alloys. B) Purifying metals. C) Separating elements. D) Accelerating particles. Show Answer Correct Answer: D) Accelerating particles. 8. Which macromolecule basic unit is glycerol and fatty acids? A) Lipids. B) Carbohydrates. C) Proteins. D) Nucleic acids. Show Answer Correct Answer: A) Lipids. 9. Who proposed first atomic theory? A) De Broglie. B) John Dalton. C) Rutherford. D) I.Mendeleef. Show Answer Correct Answer: B) John Dalton. 10. What is the shorthand electron configuration for Sulfur atom? A) [Ar] 3p4. B) [Ne] 3s23p4. C) [Na] 3s23p3. D) [He] 3s23p4. Show Answer Correct Answer: B) [Ne] 3s23p4. 11. Increase in temperature of the reactants can do one of the following A) Slow collision frequency. B) Allow less effective collision between the particles. C) Neutralise the reaction. D) Increase collision between the particles thus increasing the rate. Show Answer Correct Answer: D) Increase collision between the particles thus increasing the rate. 12. The actual amount of product in a chemical reaction A) Theoretical yield. B) Actual yield. C) Yield. D) Percent yield. Show Answer Correct Answer: B) Actual yield. 13. Which is the smallest part of an element that retains all the properties of the element? A) Proton. B) Neutron. C) Electron. D) Atom. Show Answer Correct Answer: D) Atom. 14. A negatively charged ion is called ..... A) Electron. B) Proton. C) Cation. D) Anion. Show Answer Correct Answer: D) Anion. 15. How many molecules are in 32.4 grams of phosphorous pentoxide? A) 1.76 x 1023 molecules. B) 0.29 moles. C) 1.76 x 1022 molecules. D) 0.29 molecules. Show Answer Correct Answer: A) 1.76 x 1023 molecules. 16. Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The reactants in this reactions are A) Magnesium and magnesium chloride. B) Hydrochloric acid and hydrogen gas. C) Magnesium and hydrochloric acid. D) Magnesium chloride and hydrogen gas. Show Answer Correct Answer: C) Magnesium and hydrochloric acid. 17. The mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom A) Element name. B) Element symbol. C) Atomic number. D) Atomic mass. Show Answer Correct Answer: D) Atomic mass. 18. The direct source of energy for cells is usually A) Glucose. B) Protein. C) DNA. D) Fats. Show Answer Correct Answer: A) Glucose. 19. How many electrons should Magnesium have around its Lewis dot model? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 20. What particle uniquely identifies an element? A) Number of Valence Electrons. B) Number of Protons. C) Number of Electrons. D) Atomic Mass. Show Answer Correct Answer: B) Number of Protons. Next →Related QuizzesScience QuizzesChemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8Chemistry Quiz 9Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books