Question

chemistry i si: sci8ti1s1 9 chemistry i si (lms) 3 - d assessment: chemical bonding (lms graded)
compound melting point (°c)
mgbr₂ 711
libr 550
agbr 432
cbr₄ 91
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.

Explanation:

Step1: Analyze option A

At 25°C, compounds with melting - point below 25°C are not in solid state. Since \(PBr_3\) has a melting point of - 41°C and \(HBr\) has a melting point of - 87°C, they are not solids at 25°C. So option A is incorrect.

Step2: Analyze option B

\(MgBr_2\), \(LiBr\), \(AgBr\) are compounds of bromine with metals (\(Mg\), \(Li\), \(Ag\)) and their melting points are 711°C, 550°C, 432°C respectively. \(CBr_4\), \(PBr_3\), \(HBr\) are compounds of bromine with non - metals (\(C\), \(P\), \(H\)) and their melting points are 91°C, - 41°C, - 87°C respectively. So the compounds in which bromine bonds with a metal have higher melting points than the compounds in which bromine bonds with a nonmetal. Option B is correct.

Step3: Analyze option C

The compound with the highest melting point is \(MgBr_2\) (711°C). \(MgBr_2\) is an ionic compound formed by \(Mg^{2 + }\) and \(Br^-\) ions held together by ionic bonds. Option C is correct.

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; C. The compound with the highest melting point is made up of ions held together by ionic bonds