Question

chemistry i si scibi1ms1 9 chemistry i si (lms) 3 - d assessment: chemical bonding (lms graded) pbr₃ -41 hbr -87 which of the following statements are supported by the data? select all that apply. a. all of the compounds exist in the solid state at 25°c. b. the compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal. c. the compound with the highest melting point is made up of ions held together by ionic bonds. d. the compound with the lowest melting point is made up of molecules held together by intermolecular attractions. e. the melting point of cbr₄ suggests that it be classified as an ionic compound. f. it takes more energy to overcome the attractive forces between particles of solid libr than it does to overcome the attractive forces between particles of solid pbr₃.

Explanation:

• A: Given melting - points are negative, so they are not solids at 25°C.
• B: P is non - metal, H is non - metal. Since no metal - bromine compound data is given, we can't fully verify this, but assuming no metal - bromine compounds with lower melting points exist among known ones, this can be considered correct with the given data.
• C: Among PBr₃ and HBr, PBr₃ has the higher melting point and it is a covalent compound, so this is incorrect.
• D: HBr has the lowest melting point and is a molecular compound held by intermolecular forces, so this is correct.
• E: No data about CBr₄ is given, so we can't make this conclusion.
• F: No data about LiBr is given, so we can't make this comparison.

Answer:

B. The compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal.
D. The compound with the lowest melting point is made up of molecules held together by intermolecular attractions.