lonic Compound Melting Polnt (C) MgF2 1263 MgBr2 711 CuCl 430 CuCl2 620 Which of the following statements is consistent with the melting point data shown in the table? For a given cation, ionic compounds with smaller anions have a higher melting point. lonic compounds that contain cations with al" charge have a higher melting point than do ionic compounds that contain cations with a 2" charge. C lonic compounds with the smallest difference in the electronegativities of the atoms have the highest melting point. The smaller the charge of the ions in an ionic compound and the larger the cation, the higher the melting point.

Which of the following describes a metallic substance? A tightly packed lattice of positively and negatively charged ions. The electrostatic interactions holding the ions together are hard to disrupt. A pure element or a mixture composed of neutral atoms arranged in an ordered lattice. Electrons are easily passed between atoms. A long chain of small repeating units made of atoms that are connected by covalent bonds. A network of covalent bonds connecting many atoms into one large molecule. The substance's physical properties depend on how its atoms are connected.

Organize the following elements by their electro negativity (largest to smallest): sulfer, calcium, oxygen, magnesium, aluminum

The answer is not -101938.4 J/mol

What charges are found on butanol molecules? O Hydrogens have partial negative charges Hydrogens have partial positive charges Oxygens have full negative charges O Oxygens have full positive charges O Hydrogens have full positive charges O Oxygens have partial positive charges O Hydrogens have full negative charges O Oxygens have partial negative charges O Carbons have partial positive charges O Carbons have full negative charges O Carbons have full positive charges O Carbons have partial negative charges Question 2

Two main-group elements are highlighted in the outline of the Periodic Table below: X Y What can you say about these elements without knowing exactly which they are? Use that knowledge to answer the questions in the following table, if possible. Important: do not try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from the rough location of each marked element in the Periodic Table. The atoms of which element are more likely to be the cations in an ionic compound? O Element X O Element Y O Can't say without more information. X

Identifying hydrogen-bonding interactions between molecules.

The compound ICl contains   nonpolar covalent bonds. polar covalent bonds with partial positive charges on the Cl atoms. polar covalent bonds with partial positive charges on the I atoms. hydrogen bonds. polar ionic bonds.

Which of the following compounds is likely to have the lowest melting point?   : C a O MgO S c O Se O

Select the more electronegative element in this pair. Select the more electronegative element in this pair. F Br B Select the more electronegative element in this pair. Select the more electronegative element in this pair. N B K Ca