chapter9 - With germanium tin and lead there is weak...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework Chapter 9 9.3 An alum has the general formula: M + M 3+ (SO 4 2- )2 . 12H 2 O where M + is a large monopositive ion such as potassium or ammonium and M 3+ is a small tri-positive ion such as aluminum, chromium(III), or ion(III). 9.5 a) The melting point decreases down the group as a result of the metallic bond throughout the metal lattice being weaker as the metal atoms become larger as the group is descended. b) The melting point increases down the group as the dispersion (London) forces between pairs of the covalently bonded atoms become stronger due to the increasing number of electrons. c) Carbon, at the top of the Group 14 elements, is network covalently bonded thus has a very high melting point. So is silicon.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: With germanium, tin and lead, there is weak metallic bonding and thus low melting points. 9.7 KH – ionic CaH 2 – ionic GaH 3 – network covalent GeH 4 – covalent AsH 3 – covalent H 2 Se – covalent HBr – covalent 9.11 a) N B N B N B N B N B H H H H H H H H b) B N B N B N B N B N B N H H H H H H H H H H 9.15 The ammonium ion is large and resembles the lower alkali metal ions. In particular, its nonspherical shape makes it resemble the largest of the alkali metal ions. 9.19 SO 3 (g) + H 2 O(l) Æ H 2 SO 4 (l) CrO 3 (s) + H 2 O(l) Æ H 2 CrO 4 (aq) 9.31 a) Copper(I) and Indium(I) b) Cadmium(II) and Lead(II) 9.35 a) C O b) C C 2-9.39 SiH 4 (g) + 2 O 2 (g) Æ SiO 2 (g) + 2 H 2 O(l)...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

chapter9 - With germanium tin and lead there is weak...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online