Chemistry 102 : Can You Pass This Trivia Test? Quiz
Settings
(8).jpg "Chemistry 102 : Can You Pass This Trivia Test? Quiz")
.
- 1.Calculate the concentration of CO2 , P= 3*10-4 atm , if the K=3.4*10-2 M/atm.
- A.
16*10-7
- B.
10*10-6
- C.
11*10-6
- D.
17*10-7
- 2.If the molar mass of glucose is 180g/mol, the solubility of glucose in the water at 200c is 30g/100ml is a 1.22M solution of glucose at 200c:
- A.
Saturated
- B.
Unsaturated
- C.
Super saturated
- D.
None
- 3.2M solution of Nicl2 has a density of 2.18Kg/ml, calculate the molality if ( M.m=129.7g/mol)?
- A.
9*10-3 m
- B.
9.175*10-4 m
- C.
8.1*10-4 m
- D.
9.9*10-4 m
- 4.The vapor pressure of water at 1100c is 1070 torr, a solution of ethylene , and water has a vapor pressure of 1atm , what is the mol fraction of ethylene?(1atm=760 mmHg = 760 torr)
- A.
0.71
- B.
0.55
- C.
0.29
- D.
0.77
- 5.Calculate the freezing point and boiling point of solution made of 25% by mass of CH2OHCH2OH (62 g/mol) in water give that (Kf of H2O=1.86) (Kb of H2O=0.5)
- A.
-9.92 , -102.72
- B.
-9.92,102.72
- C.
9.92, 102.72
- D.
9.92, -102.72
- 6.2NO2-----> 2NO+O2 has a rate constant K=0.63 M-1 S-1 , IF [NO2]=0.1 M, what is the half life ?
- A.
15.8
- B.
15.0
- C.
16
- D.
16.1
- 7.Ea= 65.7 KJ/mol, how many times faster the rxn will occur at 500c to 00c?
- A.
77.32
- B.
88
- C.
88.234
- D.
90
- 8.2N2O5 ------> 4NO2+O2, and (K=6.82 S-1) we stated with 0.025 mol in 2 L, How many moles of N2O5 will remain after 5 min?
- A.
3.232*10-3 mol
- B.
4*10-2 mol
- C.
5*10-3 mol
- D.
3.99 *10-3 mol
- 9.A+B -------> C. if ( V=k[A]n * [B]m ) and [A]=0.1 ,[B]=0.5 ,,, find V and K ? [A] [B] V 0.25 0.25 0.2130 0.25 0.125 0.1065 0.2 0.1 0.0682 0.35 0.1 0.1193 0.175 0.1 0.0596
- A.
V=0.1705 M/S K=3.41 M-1.S-1
- B.
V= 0.77 M/S K = 3.3 M
- C.
V= 1.3 M/S K = 4.1 M-2.S-2
- D.
V=1.1 M/S K=0.5 S-1
- 10.A catalyst:
- A.
Increase reaction rate by lowering the activation energy of forward reaction
- B.
Increase reaction rate by increasing activation energy for reverse reaction
- C.
Increase the reaction rate by providing an alternative energy
- D.
None of the above
- 11.(2NO+Br-2 ----------> 2NOBr) KC1=2 ( 2NO- -------> N2+O2) KC2=2.1*1030 At temperature=298 K Calculate Kp of (N2+O2+Br-2à2NOBr)
- A.
4.2*1030
- B.
9.5*10-31
- C.
3.9*10-32
- D.
4*10-32
- 12.Calculate pH for .5 M of HF (Ka =7.1*10-4)
- A.
1.725
- B.
0.01884
- C.
3.77
- D.
4.4
- 13.A substance that is capable of acting as both acid and base is called:
- A.
Conjugated
- B.
Amphoteric
- C.
Autocratic
- D.
None
- 14.Mixture of 5 ml of .105 M KOH and 15 ml of 9.5*10-2 M of Ca(OH)2 find Ph ?
- A.
0.1425
- B.
0.77
- C.
0.16875
- D.
13.23
- 15.Which of the following correctly relates the two equilibrium constant for two reaction shown. .. (NOCl-------->NO +1/2 Cl2) K1. (2No+Cl2 -------> 2Nocl ) K2
- A.
K2=K1
- B.
K2=1/(K1)2
- C.
K2=K1
- D.
None
- 16.Which of the following compounds doesn’t show buffer:
- A.
NH3 / NH+4
- B.
HCO-3 / H2CO3
- C.
NaOH / OH-
- D.
None
- 17.At freezing point of water 0c0 when Kw = 1.2*10-15 , calculate [H+] and [OH-] for natural solution:
- A.
1.2*10-15
- B.
3.46*10-8
- C.
2.6*10-7
- D.
None
- 18.Calculate PH if [OH] = 1.9*10 -6
- A.
5.72
- B.
8.28
- C.
5.26
- D.
None
- 19.Calculate Ka of NH4+ (Kb of NH3= 1.8*10-5)
- A.
10-4
- B.
5.6*10-10
- C.
1.8*10-7
- D.
2*10-3
- 20.The mixture formed by adding 10 ml of .1 M HBr with 20 ml of .2 M HCl , calculate PH :
- A.
0.1666
- B.
0.778
- C.
0.13
- D.
0.114
- 21.Classify each salt into (acidic, basic, natural) respectively: ( Nacl , CH3NH3Br , CH3COONa )
- A.
Natural, acidic, basic
- B.
Acidic, basic, natural
- C.
Natural, basic, acidic
- D.
None
- 22.How many moles of NH4Cl must be added to 2 L of .1 M NH3 to form a buffer solution of PH=9 (Kb NH3= 1.8*10-5)?
- A.
9.25
- B.
0.18
- C.
0.36
- D.
0.22
- 23.Calculate PH of .3 M NH3 and .36 NH4Cl , what is PH after adding 80 ml of buffer solution PKa = 9.25 (respectively)
- A.
9.17 / 9.20
- B.
9.20 / 9.17
- C.
2.70 / 2.9
- D.
None
- 24.We have the following equilibrium (2SO3 -------> 2SO2 + O2 ) what will happen to [SO3] if the temperature is increased:
- A.
Increase
- B.
Decrease
- C.
Not change
- D.
Cannot tell
- 25.PCl5 ---> PCl3 + Cl2 if Kc =.497 if the initial concentration of PCl5 = 1.66, calculate equilibrium concentration for (PCl5 / PCl3 / Cl2) (respectively):
- A.
0.96 / 0.69 / 0.69
- B.
0.69 / 0.69 /0 .69
- C.
0.69 / 0.97 /0 .97
- D.
None
- 26.Calculate PH if 1.52g of HNO3 (mm=63) in 575 ml:
- A.
0.042
- B.
1.38
- C.
1.333
- D.
1.45
- 27.The Kc of the following reaction is ( pbcl2 (s) -----> pb+2 (aq)+ 2cl-(aq) )
- A.
Kc = [cl-] [pb+2] /[pbcl2]
- B.
Kc = [cl-] [pb+2]
- C.
None
- 28.If PH =2.9 and Ka= 1.8*10-5 calculate [HA]
- A.
1.26
- B.
0.88
- C.
1.88
- D.
1.78
- 29.Which of the following statment is true?
- A.
-Heat is given off to the surrounding in an Endothermic process
- B.
-/\H is always nigative in Exothermic process
- C.
-work must be positive in an exothermic pricess
- D.
- Heat is gained by the system in an endothermic process .
- 30.A particular chemical reaction involves a single reactant. What is the order of the reaction if the rate increases by a factor of eight when the concentration of the reactant is doubled?
- A.
1st order
- B.
2nd order
- C.
3rd order
- D.
Zero order
Back to top