NABTEB GCE Chemistry Practical Expo Answers (Nov/Dec 2017)

National Business and Technical Examination Board, NABTEB GCE Chemistry Practical Expo Answers For November/December 2017 Examination.

nabteb-gce-che-pra-expo-2017

See > NABTEB GCE Chemistry Expo Answers (Nov/Dec 2017)

This is to Inform the External Candidates, that the ExpoNG™ is ready to Provide the Solutions for the NABTEB GCE Chemistry Practical Expo Answers (Nov/Dec 2017).

NABTEB CHEMISTRY PRACTICAL ANSWERS

 

1a )
i ) burette
ii) pipette
iii ) conical flask
iv ) beaker1bi )
i ) application of 2 to 3 drops of indicator to the base
ii) titration( rush) of acid into base sonutaneously and swirled ( shaked )

1bii)
weak acid vs strong base = phenophthalein

1ci )
molarity of B = mass concentration / molar mass = 2. 20/ 0. 25/ 40
molarity of B = 8.8 / 40
molarity of B = 0.220 moldm ^ -3

1cii )
CaVa / CbVb = Ca = CbVbna / Vanb = Ca = 0. 22* 25 * 1/ 24 .60 * 2= 5. 5/ 49. 2
Ca = 0 .11178
Ca = 0 .112 mold ^ -3

1ciii )
molar mass = mass concentration / molar concentration = 3. 90/ 0. 112
molar mass of H 2X = 35gmol ^ – 1
hence H 2X = 35 = 2 + X = 35
X = 35- 2
K = 33
R . A. Mx = 33 gmol ^ – 1

2ai )
the ethanedioic acid turns pink or red on adding methyl organe to it

2aii )
the hydrated form is efflorescence- when expsosed to air it effloresces and turns yellow due to atmospheric oxidation to basic iron ( iii ) teltraoxosulphate ( iv )

2aiii )
Pb ( No 3) ( aq ) +H 2SO 4( aq ) – — – -> PbSO 4( aq ) +2HNO 3
lead ( ii) tetraoxosulphate ( vi ) is formed which is insoluble in water

2aiv )
Zn( s ) + CUSO 4( aq ) — – — > ZnSO 4( aq ) + CH ( s )
copper metal is deposited as zinc displaced copper

2bi )
CaC 2( s ) + 2H 2O ( s ) – — – — > C 2H 2( g) + Ca ( OH ) 2 ( aq )

2bii)
the reaction is exothermic and hence it should be performed on a leap of sand inside the flask to prevent the flask from cracking

2biii )
Impurities – Phospine ( PH 2) hydrogen sulphide ( H 2S ) and ammonica ( NH3)
Reagent : Copper ( II ) tetraoxosulphate ( vi ) solution

2biv )
i ) because it is slightly less dense than air
ii) because it is unstable and may explode on compression to a liquid

2bv)
the reaction with sliver trioxonitrate( v) dissolved in alcohol may be used to distinguish alkenes from alkyness as no reaction in alkene . While terminal alkynes form a white precipitate

3ai )
i ) it is not used because it react with the gas as thus 2NH3( aq ) + H 2SO 4( aq ) — – — > ( NH4) 2SO 4( s )

3aii )
ammonia is very soluble in water at s .t . p due to readness with which forms hydrogen bond with water ( NH3. H 20)

3aiii )
this is to prevent trickling back of gas and mixture of gas with water formed during reaction

3b)
i ) by grinding to powder to increase surface area of contact
ii) by increasing the temperature of liquid in some cases or lower the temperature as the case may be

3ci )
FbC 03( s ) Heat – — – > Pbo ( s ) + Co 2( g)
Pb ( N 03) 2( s ) Heat – – -> pb( s ) + 2N 02 ( g) + 02( g)

3cii )
NH4Cl turns moist red litmus blue
NaCl Neutral to litmus paper
( No Reaction is observed )

3d)
y= FeSo 4- -> Fe ^ 2+ + So 4 ^ 2-
Anions: So 4^ 2 – , So ^ 3 – , S ^ 2-

3ei )
F = Wire Gauze
E= drying agent e ,g silical gel , calcium oxide, phosphorus ( v) oxide amnonia,fused calcium chloride

3eii )
it is used in keeping and drying solids in an atmosphere that is dry and free of dust
3eiii )
it is always greased in order to make it air tight and hence exclude atmospheric moisture.

FREE NABTEB CHEMISTRY PRACTICAL ANSWERS

How to get free Chemistry Practical Expo Answers, from the ExpoNG™. Kindly Like ExpoNG On Facebook & Follow ExpoNG on twitter.

PAID NABTEB CHEMISTRY PRACTICAL ANSWERS

The tagged Price for Biology Practical Expo Answers Is just a token of #500 MTN Recharge Card. All you have to do, is to get your MTN Recharge Card pin, your name, subject, and send to our inbox via Facebook (ExpoNG) using the format below.

(1122 2325 3739 2929) (#500 MTN), Charles, Chemistry Practical and Send to ExpoNG on Facebook. to do that? Simply Click HERE.

See > ExpoNG Runs Subscription (See How to Subscribe) – WAEC GCE 2017.

SEARCH TAGS BELOW

NABTEB CHE PRA GCE EXPO, NABTEB GCE CHEMISTRY PRACTICAL ANSWERS, NABTEB GCE CHE PRA, NABTEB 2017 GCE CHE PRA, FREE NABTEB GCE CHEMISTRY PRACTICAL EXPO, FREE EXPO ON CHE PRA NABTEB GCE, NABTEB GCE 2017 EXPO FOR FREE, FREE CHE NABTEB GCE ANSWERS, CHE PRA QUESTIONS FOR GCE, 2017 GCE ANSWERS, NABTEB GCE 2017 CHE PRA EXPO ANSWERS, EXPONG ANSWERS, EXPONG CHE PRA NABTEB GCE RUNS, FREE EXPONG ANSWERS, 2017 NOV/DEC GCE CHE PRA RUNS, 2017 NOV/DEC NABTEB GCE CHE PRA ANS, 2017 NOV/DEC NABTEB GCE CHE PRA EXPO, 2017 NOV/DEC GCE CHE PRA QUESTION, 2017 NOV/DEC NABTEB GCE PRA CHEMISTRY PRACTICAL QUESTIONS, NABTEB GCE PRA 2017 CHEMISTRY PRACTICAL EXPO ANSWERS, NOV/DEC NABTEB GCE PRA 2017 CHEMISTRY PRACTICAL EXPO, NABTEB NOV/DEC GCE 2017 CHE PRA ANSWERS, NABTEB GCE CHEMISTRY PRACTICAL EXPO ANSWERS, NOV/DEC NABTEB GCE 2017 CHE PRA ANS, NOV/DEC NABTEB GCE 2017 CHEMISTRY PRACTICAL ANSWER, NOV/DEC WAEC GCE 2017 CHEMISTRY RUNZ, GCE 2017 CHEMISTRY PRACTICAL ANSWERS, OBJECTIVE NABTEB CHE PRA EXPO GCE, NABTEB GCE OBJECTIVE ANSWERS

National Business and Technical Examination Board, NABTEB GCE Chemistry Practical Expo Answers For November/December 2017 Examination. via www.ExpoNG.net

ExpoNG

ExpoNGExpoNGExpoNGExpoNG

2 Comments

Add a Comment
  1. If i subscribe for chemistry, i hope the answer will be both practical and theory

  2. i want the chips

Leave a Reply

Your email address will not be published. Required fields are marked *

ExpoNG © 2018 Sitemap