This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 30 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 30 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the mass of .75 mol of sulfur, which has a molar mass of 32 g/mol. A) 16. B) 24. C) 32. D) 240. Show Answer Correct Answer: B) 24. 2. Atoms that have the same number of protons but different numbers of neutrons. A) Isotopes. B) Neutron. C) Proton. D) Atomic Mass. Show Answer Correct Answer: A) Isotopes. 3. Who formulates the law of conservation of mass? A) John Dalton. B) Joseph Priestly. C) Antoine-Laurent Lavoisier. D) Joseph-Louis Proust. Show Answer Correct Answer: C) Antoine-Laurent Lavoisier. 4. Which ONE of the following is a physical change? A) Melting ice. B) Burning wood. C) Rotting food. D) Rusting iron. Show Answer Correct Answer: A) Melting ice. 5. The number written in front of a chemical symbol or formula A) Subscript. B) Valence number. C) Atomic number. D) Coefficient. Show Answer Correct Answer: D) Coefficient. 6. Describes a molecule containing carbon and hydrogen together (usually along with others) A) Organic. B) Inorganic. C) Disorganic. D) Monorganic. Show Answer Correct Answer: A) Organic. 7. What term is given to a reaction which transfers heat energy to the surroundings? A) Endothermic. B) Reversible. C) Exothermic. D) Activation Energy. Show Answer Correct Answer: C) Exothermic. 8. Permanent hardness of water is due to the presence of? A) Calcium sulphate. B) Sodium bicarbonate. C) Calcium bicarbonate. D) Magnesium bicarbonate. Show Answer Correct Answer: A) Calcium sulphate. 9. Which statement of an elements average atomic mass is correct A) Determined by counting the number of isotopes in a sample of the element. B) Equal to 1/12 the mass of the most common isotope. C) Is a weighted average. D) Based on isotopes charge. Show Answer Correct Answer: C) Is a weighted average. 10. ..... is the amount that has to be paid to buy something. A) Cost. B) Consumer products. C) Science. D) Composition. Show Answer Correct Answer: A) Cost. 11. Where are the non-metals located on the periodic table A) Left/ Middle. B) Right. C) Staircase. D) None of above. Show Answer Correct Answer: B) Right. 12. A monomer is ..... A) A single atom. B) A building block for polymers. C) A single element. D) Is an inorganic molecule. Show Answer Correct Answer: B) A building block for polymers. 13. Group 18 noble gases are inert because A) Readily form positive ions. B) Have either a positive or negative charge. C) Outermost energy level is missing one electron. D) Outermost energy level is full. Show Answer Correct Answer: D) Outermost energy level is full. 14. Ability of carbon atom to bond with other carbons to form a chain of endless variety. A) Canteen sa PLV. B) Cantilever. C) Cantelation. D) Catenation. Show Answer Correct Answer: D) Catenation. 15. How many water molecules are in 5.2 moles of water? A) 6.02 x 1023. B) 5.2. C) 3.1 x 1024. D) 8.638 x 10-24. Show Answer Correct Answer: C) 3.1 x 1024. 16. How many total electrons does O-2 (an oxide ion) have? A) 8. B) 10. C) 6. D) 18. Show Answer Correct Answer: B) 10. 17. Select the chemical symbols for the following elements in the correct orderHelium, Lithium, Florine, Carbon, Potassium, Phosphorus A) H, Li, F, Ca, P, Po. B) He, Li, F, C, K, P. C) H, L, F, C, Po, P. D) He, Li, F, C, P, K. Show Answer Correct Answer: B) He, Li, F, C, K, P. 18. You have 85.5 g of fluorine, which has a molar mass of 19 g/mol. how many mols of fluorine do you have? A) 4.5 mol. B) 19 mol. C) 45 mol. D) 85 mol. Show Answer Correct Answer: A) 4.5 mol. 19. Silicon (Si) has ..... shells A) 4. B) 6. C) 3. D) 5. Show Answer Correct Answer: C) 3. 20. Valence electrons are A) Electrons farthest away from the nucleus. B) Electrons closest to the nucleus. C) Electrons that just come and go-they don't stay with the atom. D) None of above. Show Answer Correct Answer: A) Electrons farthest away from the nucleus. ← 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