منتدى التعليم توزيع وتحضير المواد الدراسية

Q1: the length of a cylindrical vessel is 12.7cm. what is the diameter of the vessel if 105.5 g of mercury can fill it completely? (Density of mercury is 13.6 g[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image002.png[/IMG]mL)
Q2: A graduated cylinder is filled with 242.0 mL of water. A piece of silver (AG) ****l weighing 194.3 g was dipped in the water . the volume of water now reads 260.5 mL . from these data calculate the density of silver.
Q3: A sheet of aluminum (Al) foil has a total area of 1.000 ft 2 and a mass of 3.636 g. what is the thickness of the foil in millimeters? (Density of Al is 2.699 g[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image002.png[/IMG]cm3 )
Q4: Convert:

a- 300 k to oc

b- 500 oF to oc

c- 273.15 k to oF

Q5: fill the planks in the following table

symbol

5426F+2

protons

neutrons

117

136

electrons

Net charge

-3

Q6: fill the planks in the following table

cation

anion

formula

Name

Magnesium

bicarbonate

SrCl2

Fe3+

NO2-

Manganese(ll)

Chlorate

SnBr4

CO2+

PO3-4

Hg2+2

Cu2CO3

Lithium nitride

Al3+

S2-

Q7: urea ](NH2)2CO[ is used for fertilizer and many other applications. Calculate the number of N, C, o, and H atoms in 1.68× 104 g of urea?

Q8: Allicin is the compound responsible for the characteristic smell of garlic . An analysis of the compound gives the following percent compositions by mass : C:44.4 , H:6.21 , S:39.5 and O:9.86

Percent . Calculate the empirical formula and the molecular formula if the molar mass of Allicin is 162 g ?

Q9: silicon tetrachloride (SICl4) can be prepared by heating Si in gaseous cholrine according to the equation:

[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image003.png[/IMG][IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image004.png[/IMG]Si(s) + Cl2(g) SiCl4(I)

In one reaction , 0.507 mole of SiCl4 is produced . Using a balanced equation calculate how many moles of molecular were used in the reaction?

Q10: for the reation

[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image005.png[/IMG] C4H10+O2 CO2 + H2O

a- Balance the above eqation

b- Using the balance cholrine , calculate the number of CO2 formed if 5.0 moles of C4H10

are reacted with excess oxygen

Q11- write the expressions of the equilibrium kc of the following reactions :

[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image006.png[/IMG][IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image004.png[/IMG](a)- 2NaHCO3 (s) Na2CO3 (s) + CO2 + H2O (g)

[IMG]file:///C:\Users\sehamh\AppData\Local\Temp\msohtmlclip1\01 \clip_image007.png[/IMG](b)- 2CaSO4 ( s) 2CaO2 (s) + O2 (g)

Q12- for the reaction

H2 (g) + CO2 (g) [IMG]file:///C:%5CUsers%5Csehamh%5CAppData%5CLocal%5CTemp%5Cmso htmlclip1%5C01%5Cclip_image008.png[/IMG] H2O (g) + CO (g)

The equilibrium constant kc was found to be 0.534 at 700 oC. calculate the number of moles of H2 that are present at equilibrium if a mixture of 0.300 mole of CO and 0.300 mole of H2O is heated to 700 oC in a 10.0 L container.