1.
Calculate the volume occupied by 2,50 mol of
carbon dioxie at a pressure of 100 KPa and a temperature of 19 oC.
(R= 8,31 JK -1 mol -1
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
2.
A flask volume 5,00 dm3 contained
4.50 gram of oxygen. Calculate the pressure exerted by the gas at a temperature
of 250 oC.
(Rr = 8,31 JK -1 mol -1 , Mr Oxygen = 32.0)
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
______________________________________________________________________________________________________________________________________________________________________________
3.
Calculate the volume occupied by 272 g of methane
at a pressure of 250 KPa and a
temperature of 55 0C
(R = 8,31 JK-1 mol -1); Mr methane = 16 .0)
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
4.
Describe 4 the behaviors of liquid state?
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
5.
Explain the following:
a.
Why most metals are the strong, but ionic solids
are brittle?
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
b.
Why is an alloy of copper and tin stronger than
either copper or tin alone?
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
6.
Crystals of sodium chloride have a lattice
structure.
a.
Describe a sodium chloride.
b.
Explain the following properties of sodium chloride.
(i)
Sodium chloride has a high melting point
(ii)
Sodium chloride conducts electricity when molten
but not when solid
(iii)
Sodium chloride is hard but brittle
7.
Why purifying and remolding aluminium is much
cheaper than extracting aluminium from bauxite ore?
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
8.
What is ceramics?
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
9.
Describe the terms alloy !
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
10.
Why is brass stronger than pure copper?
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
No comments:
Post a Comment