Chemistry Answers

a. Distinguish between amorphous and crystalline solids, giving examples of each. How does the structure of each type of solid affect its properties?

b . Describe the lattice structure of crystalline, giant molecular and simple molecular solids giving examples of each type.

Calcium hydride, CaH2, reacts with water to form hydrogen gas:

CaH2 (s) + 2H2O (l) → Ca(OH)2 (aq) + 2H2 (g)

The reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired. How many grams of CaH2 are needed to generate 64.5 L of H2 gas if the pressure of H2 is 814 torr at 32 oC?

1.5 molar,

50 mL nitric acid solution

Volume of solute, mass solute, volume of water

³₂ He + ²₁ H

A solution that contains 12.6 g of a nonvolatile non-dissociating solute in 400 g of benzene freezes at 3.6°C. The normal freezing point of benzene is 5.5°C. What is the molar mass of the solute? (Kf for benzene = 4.96°C kg/mole)

A solution of salt water raised the boiling point of water from 100°C to 102.5°C. What is the molality of the solution? Assume Kb of water is 0.51°C/m.

A compound containing only nitrogen and oxygen is

63.64% N by mass the empirical formula of the

compound is

What is the

A chlorine oxide is 59.7%% by mass CI What is the

empirical formula of the oxide?

A chlorine oxide is 59.7%% by mass CI What is the

empirical formula of the oxide?

Will AgIO3 precipitate when 20 mL of 0.010M AgIO3 is mixed with 10 mL of 0.015M NaIO3? Ksp of AgIO3 is 3.1× 10-8

The vapor pressure of water at 25 ºC is 23.8 mmHg. What is the vapor pressure of a solution containing 5.50 g of nonelectrolyte sucrose (MWsucrose= 342 g/mol) in 12.8 g of water (MWwater= 18.0 g /mol) at 25.0 °C