General Chemistry Answers

a. Define the terms viscosity, capillary action and surface tension.

b. How do the viscosity and surface tension of liquids change as intermolecular forces become stronger? Explain.

c. How do the viscosity and surface tension of liquids change as temperature increases? Explain.

d. Using the Kinetic Particulate theory explain the compressibility of liquids .

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.

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

A sample of 0.892 g of potassium chloride (KCl) is dissolved in 54.6 g of water (H2O). Determine the percent mass of KCl in the solution and its molality if the molar mass of KCl is 74.5513 grams

per mole.

CH₄ + 2O₂ = CO₂ + 2H₂O

How many grams of O₂ is needed to produce 37.5 g of CO_2.