This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 3 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. We know that air is a mixture and not a compound because A) It can be heated to a higher temperature. B) It can be compressed to a smaller volume. C) It is colorless. D) Its composition can vary. Show Answer Correct Answer: D) Its composition can vary. 2. Balance the following: ..... Al + ..... O2 $\rightarrow$ ..... Al2O3 A) 2, 3, 4. B) 4, 3, 2. C) 1, 1, 2. D) 2, 1, 1. Show Answer Correct Answer: B) 4, 3, 2. 3. The amount of matter in an object is its A) Density. B) Weight. C) Volume. D) Mass. Show Answer Correct Answer: D) Mass. 4. What do you call two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons? A) Cation. B) Anion. C) Isotope. D) Neuron. Show Answer Correct Answer: C) Isotope. 5. How many electrons are found in the 2nd energy level? A) 2. B) 8. C) 16. D) None of above. Show Answer Correct Answer: B) 8. 6. Which macromolecule stores energy and makes up the cell membrane? A) Lipids. B) Proteins. C) Carbohydrates. D) Nucleic acids. Show Answer Correct Answer: A) Lipids. 7. What do you call this attractive force holding particles together in the condensed phases of matter? A) Coulombic Attraction. B) Intermolecular Force. C) Van der Waals Forces. D) London Dispersion Force. Show Answer Correct Answer: B) Intermolecular Force. 8. It includes flammability, toxicity, reactivity to water and oxygen like rusting, heat combustion etc. A) Matter. B) Phase transition. C) Physical properties. D) Chemical properties. Show Answer Correct Answer: D) Chemical properties. 9. The positively charged subatomic particle contained in the nucleus of an atom A) Proton. B) Neutron. C) Electron. D) Matter. Show Answer Correct Answer: A) Proton. 10. What type of charge does a neutron have? A) Positive. B) Negative. C) Neutral. D) None of above. Show Answer Correct Answer: C) Neutral. 11. When water is heated, the amount of solid that can be dissolved in it A) Increases. B) Decreases. C) Remains the same. D) None of above. Show Answer Correct Answer: A) Increases. 12. What is a reactant? A) A volatile chemical. B) A dangerous substance. C) The substances you start with in a chemical reaction. D) The substances that are formed by a chemical reaction. Show Answer Correct Answer: C) The substances you start with in a chemical reaction. 13. How many protons are in the nucleus of an atom with an atomic number of 15? A) 15 protons. B) 30 protons. C) 10 protons. D) None of above. Show Answer Correct Answer: A) 15 protons. 14. What trend does atomic radius follow as you move down the families on the Periodic Tables A) Decreases. B) Increases. C) Remains the same. D) None of above. Show Answer Correct Answer: B) Increases. 15. A 10.0 gram of water sample decomposes into 1.11 grams of H2 and 8.89 grams of O2. Which law supports this? A) Law of definite proportions. B) Law of conservation of mass. C) Law of constant composition. D) Law of multiple proportions. Show Answer Correct Answer: B) Law of conservation of mass. 16. The charge on an electron is A) Positive. B) Neutral. C) Negative. D) Dependent on the atomic number. Show Answer Correct Answer: C) Negative. 17. The dissolved materials in a solution A) Solution. B) Solute. C) Solvent. D) Saturated solution. Show Answer Correct Answer: B) Solute. 18. How many molecules of sugar (C6H12O6) are in one mole? A) 24 molecules. B) 180 molecules. C) 180 g. D) 6.02 x 1023 molecules. Show Answer Correct Answer: D) 6.02 x 1023 molecules. 19. When an atom loses electrons it becomes A) A positive ion. B) A negative ion. C) Both positive and negative ion. D) A neutral ion. Show Answer Correct Answer: A) A positive ion. 20. Contact lenses are made from? A) Lucite. B) Teflon. C) Polystyrene. D) Polyvinyl chloride. Show Answer Correct Answer: D) Polyvinyl chloride. ← PreviousNext →Related QuizzesScience QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8Chemistry Quiz 9Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books