Question 1: choose the correct answer from the following
1 liter is:
a. 1000 milliliters
b. 100 milliliters
C. 10 milliliters
d. 1 milliliters
1-
The atmosphere is a unit of:
a.
b.
c.
d.
2-
Volume
Temperature
Pressure
density
560 mmHg is equal to :
a.
b.
c.
d.
0.56 atm
0.74 atm
0.73 atm
0.47 atm
3- Calculate the pressure of 0.55 mol of NH3 gas in a 2.00 L vessel at 25 °C, using the ideal gas law.
a. 2.5 atm
b. 6.7 atm
c. 0.6 atm
d. 7.5 atm
e. 3.4 atm
4-
The neutralization reaction is a reaction between
a.
b.
c.
d.
Salt and another salt
Acid and base
Acid and ester
Alcohol and acid
5- If the volume in liter and mass by kilogram what is the unit of density
a.
b.
c.
d.
g/L
mg/ml
kg/L
kg/ml
6- the viscosity is directly proportional to one of the following factors
a. density
b. temperature
c. pressure
d. volume
7- Unit of molality of liquid is
a. Liter/Gram
b. Mole /Kilogram
c. Mole / Liter
d. Mole / mL
8- All of the following is the name of Ka except:
a. Equilibrium constant
b. Dissociation constant
c. Ionization constant
d. Velocity constant
9- What is the point which all acid convert to conjugated base
a. Equivalent point
b. Boiling point
c. Triple point
d. Freezing point
Question 2: answer the following question using suitable law
1- Calculate the molar mass of vapor from an unknown liquid occupied a 283 mL at 99.5 0C and
443 mmHg. The mass of vapor is 1.2 gm? R = 0.08206 L.atm/mole.K
2- What is the number of mole of solute which dissolve in liquid freezes at 3.0 0C. the mass of liquid
is 21.31 gm while after dissolve solute freezes at -4.0 0C. Kf = 6.8?
3- What is the heat of reaction when the temperature change from 28 0C to 75 0C and the volume of
product is 250 ml (d = 1.204 g/ml) where specific heat is 4.215 J/g 0C?
4- In acid base reaction the volume of acid is 20 ml while the equivalent point of titration at 25 ml
of 0.01M of base what is the concentration of acid?
5- What is the viscosity of oil if the time of flow in the same pipette of oil is 854 sec and for
glycerin is 5 minuet and densityes of oil and glycerin is 2.05 and 1.88 gm/mL. viscosity of glycerin
is 22.5 centipoises?
6- Mass of condensed vapour = 0.395 g at 960C and 755 mm Hg which occupied by 137 mL. What
is the molar mass of the liquid? R = 0.08206 L.atm/mole.K
7- A 0.65 g sample of unknown substance was dissolve in 50 ml of cyclohexane. The density of
cyclohexane is 0.779 g/mL. the freezing point depression was 2.50 0C. Calculate the molar mass
of unknown substance. [Kf(cyclohexane) = 20.0 0C/m]
8- Acid its pH at ½ of equivalent point is 9.24. What is the pKa of the acid and find Ka.
9- When 50 L potassium hydroxide solution, NaOH 1.0 M is added with 50 L hydrochloric acid HCl
1.0 M, the temperature of mixture increase 6.2 oC. Calculate the heat released form this reaction.
specific heat capacity is 4.2 J/g. oC.
10- From the above question calculate the heat of neutralization for this reaction(∆H). by KJ/mole