This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 49 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 49 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A ..... is the smallest chemical unit of matter. When these units all have the same number of protons, they are the same ..... A) Atom, atom. B) Atom, element. C) Element, element. D) Element, atom. Show Answer Correct Answer: B) Atom, element. 2. What is the number of signifiant digits present in0.01025 A) 5. B) 4. C) 3. D) 2. Show Answer Correct Answer: B) 4. 3. A H2O molecule is bonded by what kind of bond? A) Hydrogen. B) Ionic. C) Covalent. D) Electronic. Show Answer Correct Answer: C) Covalent. 4. What determines the order of placement of the elements on the modern Periodic Tables? A) Atomic number. B) The number of neutrons, only. C) Electron number. D) Atomic mass. Show Answer Correct Answer: A) Atomic number. 5. A chemical symbol always begins with a A) Lower case letter. B) Capital letter. C) Number. D) Cursive letter. Show Answer Correct Answer: B) Capital letter. 6. What is a biological molecule? A) Organic molecule found in any organism. B) Any living thing. C) Any nonliving thing. D) The building block of life. Show Answer Correct Answer: A) Organic molecule found in any organism. 7. Represents all the known elements ..... A) Periodic table. B) Atomic theory. C) Bohr diagrams. D) Lewis Dot structures. Show Answer Correct Answer: A) Periodic table. 8. Which of these is a mixture? A) Laundry Detergent. B) Salt (NaCl). C) Oxygen (O). D) Fluorine (Fl). Show Answer Correct Answer: A) Laundry Detergent. 9. At what pH level would both Bromthymol blue and Bromcresol green be yellow? A) 10. B) 5. C) 3. D) 6. Show Answer Correct Answer: C) 3. 10. A solution that contains the maximum amount of solute that a given quantity of a solvent can dissolve A) Solution. B) Unsaturated solution. C) Supersaturated solution. D) Saturated solution. Show Answer Correct Answer: D) Saturated solution. 11. A homogeneous mixture is a A) Compound. B) Element. C) Solution. D) Plasma. Show Answer Correct Answer: C) Solution. 12. Subatomic particles with a negative charge A) Electrons. B) Neutrons. C) Protons. D) Quarks. Show Answer Correct Answer: A) Electrons. 13. A substance will have stronger London dispersion forces if it has A) More electrons. B) Fewer electrons. C) Polar bonds. D) Hydrogen bonded oxygen. Show Answer Correct Answer: A) More electrons. 14. What does an enzyme do? A) Adds activation energy to a reaction. B) Raises the amount of activation energy for the reaction. C) Lowers the amount of activation energy needed for a reaction. D) Does not affect the metabolism of living things. Show Answer Correct Answer: C) Lowers the amount of activation energy needed for a reaction. 15. RNA stands for what? A) Risosome nucleic acid. B) Ribonucleic acid. C) Reoxyribonucleic acid. D) Deoxyribonucleic acid. Show Answer Correct Answer: B) Ribonucleic acid. 16. What is the mass of one mole of potassium (K)? A) 19 grams. B) 39.10 grams. C) 30.97 grams. D) 38 grams. Show Answer Correct Answer: B) 39.10 grams. 17. Which of the following would be considered a combustion reaction? A) CH4 + Li. B) O2 + Li. C) C3H8 + O2. D) None of the following. Show Answer Correct Answer: C) C3H8 + O2. 18. It is anything that has mass and takes up space A) Atoms. B) Matter. C) Electrons. D) Chemistry. Show Answer Correct Answer: B) Matter. 19. The ejection of electrons when a metal surface is irradiated is known as A) Zeeman effect. B) Atomic spectrum. C) Photoelectric effect. D) Black body radiation. Show Answer Correct Answer: C) Photoelectric effect. 20. A sample of Strontium 88 has a atomic number of 38 and an ion charge of +2. How many protons are in an atom of Strontium 88? A) 40. B) 88. C) 38. D) 90. Show Answer Correct Answer: C) 38. ← 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