Helium gas (He) diffuses faster than argon gas(Ar) at the same temperature. According to the Kinetic Molecular Theory , which of the following statements correctly explains this?

Which of the following solutes would be most soluble in liquid hexane (C6H14)?

What is the molality of a 10.0% (by mass) aqueous solution of potassium nitrate (KNO3)?   Hint:  The molar mass of potassium nitrate is 101.1 g/mol.

Motor oil flows more easily in a hot engine than in a cold one. Which statement best explains this observation?

For the diethyl azodicarboxylate molecule (DEAD)  below, the hybridization for arrow indicated nitrogen atom is _______ and there is/are  _______  pi (π) bond(s) in the structure. Hint:  Not all H and C are written out.  Consider the bonded hydrogens and the lone pairs that are not depicted on the structure but may needed to complete an octet.  

At a constant temperature, neon (Ne) atoms move faster on average than xenon (Xe) atoms. Which statement best explains this observation in terms of the Kinetic Molecular Theory?

125 g of Cu(NO3)2 is added to enough water to produce 585 mL of solution. What is the molarity (in M) of this solution? Hint: molar mass copper (II) nitrate = 187.57 g/mol

In which of the following species does the central atom VIOLATE the octet rule?

What is the new freezing point (in °C) of a 1.50m aqueous solution of CaCl2 ? Hint: The molal freezing point depression constant (Kf) of water is 1.86°C/m.

  Consider the following densities of some common materials: Metal Density (g/cm3) brass 8.55 brick 1.92 cork 0.24 cast iron 7.21 lead 11.34 quartz 2.64 Given 10.0 g of each of the following materials, which would occupy the smallest volume?