decrease, since only a fraction of the water molecules has changed to vapour
remain constant, because the total number of water molecules has not changed
increase, because the water molecules can now reach every part of the sealed tube
decrease, since water boils under reduced pressure
increase, because the water vapour molecules now strike the walls of the tube more frequently because of their increased velocity
Correct answer is E
No explanation has been provided for this answer.
Which of the following bonds exist in crystalline ammonium chloride (NH4Cl)?
Ionic and covalent
Ionic and co-ordinate
Ionic covalent and co-ordinate
Covalent , co-ordinate and metalllic
Ionic, covalent and metallic
Correct answer is C
No explanation has been provided for this answer.
133.3 cm3
85 cm3
75 cm3
65 cm3
58.3 cm3
Correct answer is C
P1 = 750MHg V1 = 100cm3 l2 = 308k
P2 = 100 mmHg V2 = ?
But (P1V1)/(T1) = ((P2V2)/(T2) i.e (750 x 100)/(308) = (1000 x )/(V2)/(308)
V2 = (750 x 1000 x 308)/(308 x 1000) = 75 cm3
CH4
C2H2
C2H4
C2H6
C3H8
Correct answer is C
% of H2 = 14.29
% of C = 85.71
Divided by At wts
For H = (14.29)/(1) = 14.29
For C = (85.71)/(12) = 7.14
Dividing by smallest number we have the following:
For H (14.29)/(7.14) = 2
For C = (7.14)/(7.14) = 1
Emperical formula of the comp = CH2
wt of hydride taht will occupy 22400 cm is 22400 x 0.7
56 = 28 = mole wt of hydride
X(CH2) = 28
X(12 + 2) = 28 i.e 14x = 28x = 2
The formula of hydrocarbon is therefore C2H4
0.02
0.16
0.20
0.25
20
Correct answer is D
H2 = 20cm
O2 = 35cm
N2 = 10cm
CO = 15cm
Total vol = 80cm
Mole fraction of H2 = (20)/(80) = 0.25