Chapter 1, Problem 6P

Which substance's solubility decreases with an increase in temperature? 100 90 NANO 80 70 60 CaCl, 50 Pb(NO,)2 40 KC NaCl 30 20 KCIO, 10 Ce,(SO)3 10 20 30 40 50 60 70 80 90 100 Temperature (°C) Solubility (g of salt in 100 g H,O) SONY

What is a compound? Cite three examples.

What state is Br2 in the following equation? S (s) + Br, (1) –→ SBr, (g) Solid Liquid Gas Aqueous 2 point What state is CO2 in the following equation? Na,CO, (s) + 2 HCI (aq) → 2 NaCl (aq) + H,O (1) + CO, (g)

In the periodic table: Elements in the same group have the same valence charges. O False O True

Potassium fluoride (KF) is a molecule formed by air ionic bond. At equilibrium separation tire atoms are r0=0.255nm apart. Determine the electrostatic potential energy of the atoms, The electron affinity of F is 3.40 eV and the ionization energy of K is 4.34 eV. Determine dissociation energy. (Neglect the energy of repulsion.)

For each of the following atoms or molecules, identify the most likely type of bonding that occurs between the atoms or between the molecules. Choose from the following list: ionic, covalent, van der Waals, hydrogen. (a) atoms of krypton (b) potassium and chlorine atoms (c) hydrogen fluoride (HF) molecules (d) chlorine and oxygen atoms in a hypochlorite ion (ClO)

The electron affinity of Cl is 3.89 eV and the ionization energy of K is 4.34 eV. Use the preceding problem to find the dissociation energy. (Neglect the energy of repulsion.)

The separation between hydrogen atoms in a H2 molecule is about 0.075 nm. Determine the characteristic energy of rotation in eV.

Referring only to a periodic table, give the number of covalent bonds expected for each of these representative elements: (a) H, (b) Ar, (c) F, (d) Si, and (e) P.