[كن مع الله ولآتبالي^_^]

لرفع الهمه تمارين اخترتها عشوائيا حاولو تحلوها وانا حااحاول:

Which one of the following substances will be the most soluble in watera) KBr b) C10H8 c) CCl4 d) C8H18

When NaCl dissolves in water,

a) the oxygens of the water molecules are attracted to the sodium ions.
b) the hydrogens of the water molecules are attracted to the chloride ions.
c) the sodium and chloride ions becomes separated due to solvation.
d) all of the above are true.




Use the table of data shown below to calculate the value of the rate constant k. The reaction is first order.

time (s) [A] (M)

0 0.124
10.0 0.102
20.0 0.0831
30.0 0.0681
40.0 0.0557

The reaction 2NO (g) + Br2 (g) à 2NOBr (g) is second order with respect to NO and first order with

respect to Br2. Which is the correct rate law for this reaction

a) Rate = k[NO][Br2] b) Rate = k[NO]2[Br2]
c) Rate = k[NOBr]2 d) Rate = k[NO][Br2]2