This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry Basics > Chemistry – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 18 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Each element of the periodic table is composed of how many atoms? A) 1. B) 2. C) 3. D) None of above. Show Answer Correct Answer: A) 1. 2. A substance that contains only one type of atom is a(n) A) Compound. B) Element. C) Heterogeneous mixture. D) Homogeneous mixture. Show Answer Correct Answer: B) Element. 3. How many variables can be tested in a controlled experiment? A) One. B) Two. C) Three. D) As many as possible. Show Answer Correct Answer: A) One. 4. Which branch of chemistry would study an unknown material to determine its composition? A) Analytical. B) Organic. C) Inorganic. D) Physical. Show Answer Correct Answer: A) Analytical. 5. Which of these is one of the six most common elements found in the human body? A) Iron. B) Helium. C) Oxygen. D) Water. Show Answer Correct Answer: C) Oxygen. 6. Why is water NOT on the periodic table? A) It is naturally occuring. B) It is a compound, not an element. C) It exists as a solid, a liquid, and a gas. D) Its chemical formula doesn't fit. Show Answer Correct Answer: B) It is a compound, not an element. 7. A student incorrectly wrote the following electron configuration for fluorine as: 1s22s22p4How is this electron configuration for fluorine incorrect? A) It is incorrect because in the 1s orbital, there should be 1 electron instead of 2. B) It is incorrect because in the 2s orbital, there should be 3 electrons instead of 2. C) It is incorrect because in the 2p orbital, there should be 5 electrons instead of 4. D) It is incorrect because there should be an additional 3s level containing 2 electrons. Show Answer Correct Answer: C) It is incorrect because in the 2p orbital, there should be 5 electrons instead of 4. 8. The function of antioxidants is to A) Slow down the oxidation of fats in food. B) Give smooth texture. C) Thicken liquids. D) Replace the original flavours. Show Answer Correct Answer: A) Slow down the oxidation of fats in food. 9. Chemical reactions involve changes in properties and changes in ..... that you can often observe. A) Catalyst. B) Energy. C) Activation energy. D) Decomposition. E) Chemical changes. Show Answer Correct Answer: B) Energy. 10. A reaction that gives off heat to its surroundings is ..... A) Exothermic. B) Endothermic. C) Endergonic. D) None of these. Show Answer Correct Answer: A) Exothermic. 11. Which of the following formulas is correct for sodium phosphate? A) Na2PO3. B) NaPO. C) Na3(PO4)2. D) Na3PO4. Show Answer Correct Answer: D) Na3PO4. 12. The smallest part of an element is A) Proton. B) Atom. C) Compound. D) Mixture. Show Answer Correct Answer: B) Atom. 13. What is it called when a solid turns directly into a gas? A) Sublimation. B) Condensation. C) Liquid. D) None of above. Show Answer Correct Answer: A) Sublimation. 14. An intensive property that refers to the appearance of quality of light reflected from the surface of a mineral. A) Luster. B) Color. C) Refraction. D) Smoothness. Show Answer Correct Answer: A) Luster. 15. Covalent bonds form between1. Metal-Non-metal 2. Non-metal-Non-metal3. Metal-Metalloid 4. Non-metal-Metalloid A) 1 and 2. B) 2 and 3. C) 3 and 4. D) 2 and 4. Show Answer Correct Answer: D) 2 and 4. 16. How many chlorine (Cl) atoms are in CaCl2? A) 2. B) 4. C) 1. D) 3. Show Answer Correct Answer: A) 2. 17. You are about to open an iced coffee, and notice the label says to "shake well" , the drink must be a ..... A) Solution. B) Colloid. C) Suspension. D) Compound. Show Answer Correct Answer: C) Suspension. 18. Which statement is correct about the cleansing action of soap? A) Soap molecules emulsify oil. B) Soap reacts with an acid to form salt. C) Soap increases the surface tension of water. D) The hydrophobic part of soap molecules dissolves in water. Show Answer Correct Answer: A) Soap molecules emulsify oil. 19. Which particle contributes the negative charge to the atom? A) Proton. B) Electron. C) Neutron. D) Nucleus. Show Answer Correct Answer: B) Electron. 20. Which three compounds can be considered to be a homologous series? A) CH3OH, CH3CH2OH, CH3CH2CH2OH. B) CH3CH2OH, CH3CHO, CH3COOH. C) CH3CH2CH(OH)CH3, CH3CH2CH2CH2OH, (CH3)3COH. D) CH3CH2CH2CH2OH, CH3CH2OCH2CH3, (CH3)2CH2CHO. Show Answer Correct Answer: A) CH3OH, CH3CH2OH, CH3CH2CH2OH. ← PreviousNext →Related QuizzesChemistry QuizzesScience QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books