AP CHEMISTRY RESCUE Video 303 : Rescue Your AP Properties of Solids, Liquids & Gases MCQs Explained

Medium Questions Q1. Based on the information in the table above, which of the following best explains why CCl₄ has a higher vapor pressure than CBr₄? Answer: D. CCl₄ has weaker London dispersion forces than CBr₄. ⸻ Q2. Which of the following statements about silicon dioxide is correct? I. Silicon dioxide is a covalent network solid II. Each silicon atom is covalently bonded to four oxygen atoms III. Silicon dioxide is a good electrical conductor Answer: A. I and II only ⸻ Q3. Which of the following could be the identity of a solid that exhibits the following properties? • It melts at 996 ºC. • It does not conduct electricity as a solid. • It conducts electricity when dissolved in water. Answer: A. MgBr₂ (s) ⸻ Q4. Which of the following statements about diamond and graphite is correct? Answer: C. The differences in their properties can be explained by their different structural arrangements. ⸻ Q5. Which explains why methane has a lower melting point than sodium chloride? Answer: B. Intermolecular forces are weaker than ionic bonds. ⸻ Q6. Which of the following best explains why liquids have a definite volume but no definite shape? Answer: B. The particles in a liquid are loosely packed and can move past each other, but are still close together. ⸻ Q7. Which of the following statements explains why gases are highly compressible compared to solids and liquids? Answer: C. Gases are highly compressible because the particles are widely spaced, leaving large amounts of empty space between them. ⸻ Q8. Which of the following factors is primarily responsible for the increase in melting points observed as you move down Group 7A from fluorine to astatine? Answer: B. Intermolecular forces become stronger. ⸻ Hard Questions Q1. Which of the following metals would have the highest melting point? Answer: C. Al ⸻ Q2. Which of the following best describes the solid represented in the diagram above? Answer: A. It is a brittle, water soluble electrolyte with poor electrical and thermal conductivity as a solid. ⸻ Q3. Which of the following best describes the difference between crystalline and amorphous solids? Answer: B. Crystalline solids have an orderly, repeating atomic structure, while amorphous solids have a disordered, non-repeating structure. ⸻ Q4. The structure of cellulose is shown above. Cellulose is a polymer that is insoluble in water, but it is made from water soluble glucose monomers. Which of the following types of noncovalent interactions is most likely responsible for the structure and insolubility of cellulose in water? Answer: A. Hydrogen bonding. ⸻ Q5. Which of the following statements is true about sodium acetate, CH₃COONa? Answer: D. It forms a basic solution when dissolved in water. ⸻ Q6. Two molecular substances, A and B, have similar molar masses. Substance A has hydrogen bonding between its molecules, while substance B is nonpolar with only London dispersion forces. Which statement correctly predicts their relative boiling points? Answer: C. A has a higher boiling point due to stronger intermolecular forces from hydrogen bonding. ⸻ Q7. A mixture contains four solids at room temperature (P = nonpolar molecular, Q = covalent network, R = ionic, S = metallic). When heated, in what order would they melt/transition? Answer: A. P → S → R → Q Struggling with AP Chemistry Unit 3: Properties of Solids, Liquids, and Gases? In this video, we break down some of the most common AP-style multiple-choice questions (MCQs) step by step. ✅ You’ll learn how to: • Compare London Dispersion Forces, Dipole–Dipole Forces, and Ionic Bonds in solids and liquids. • Explain why CCl₄ has higher vapor pressure than CBr₄. • Identify covalent network solids like SiO₂ and their unique structures. • Predict solubility, conductivity, and melting point trends in ionic vs molecular vs metallic vs network solids. • Understand why methane melts lower than NaCl (weak LDF vs strong ionic bonds). • Connect structure to properties: crystalline vs amorphous solids, cellulose hydrogen bonding, sodium acetate solubility, and more. • Apply the AP Exam Rescue Tip: always connect bonding type → strength of forces → observed property (mp, bp, conductivity, solubility, vapor pressure). These are high-yield questions directly aligned with the AP Chemistry CED (2025 syllabus). Mastering these saves easy points on both MCQs and FRQs. ⸻ 📌 Hashtags #APChemistry #APChem2025 #Unit3 #ExamRescue #ChemistryHelp #IntermolecularForces #PropertiesOfMatter #LondonDispersion #IonicBonding #NetworkSolids #MolecularSolids #MetallicSolids #APChemMCQ #StudyTips #HighSchoolChemistry