• Home
  • exam expo
  • 2020/2021 WAEC/NECO Answers: 2020 GCE WAEC chemistry practical answers

2020/2021 WAEC/NECO Answers: 2020 GCE WAEC chemistry practical answers



+234 8108515604[email protected]
+234 703070473508138274394

Notice
Our 2021 WAEC Expo Subscription for answers supply ends by Sunday Night. Note: we don't accept calls.
Login Subscribe Join




ECONOMICS-OBj
1-10: CABABCBBCC
11-20: CDBAABCCCA
21-30: CCADBAACDB
31-40: BBABDBABAC
41-50: CCABCBCBCC

This is actually the 2019 GCE WAEC chemistry practical answers Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2020 WAEC/NECO Answers midnight before the exam, try contacting us.


CHEMISTRY-PRACTICAL
(2ai)
TEST: E + H2O(stirred)
INFERENCE: E is a mixture of salts

(2aii)
TEST: Residue
INFERENCE: Gas evolved is CO2 from HCO3- or CO3²-

(2aiii)
TEST: residue + HNO3 + H2O
INFERENCE : CO2 gas is evolved from HCO3-or CO3²-

(2aiv)
OBSERVATION: Blue gelatinous ppt soluble in drops. Soluble in excess to give deep blue ppt.
INFERENCE: Cu2+ present
Cu2+ confirmed

(2bi)
INFERENCE : Zn²+, pb²+, Al³+ present
Zn²+, pb²+ present

(2bii)
OBSERVATION: White gelatinous ppt soluble in excess Nh3 solution
INFERENCE: Zn²+, pb²+, Al³+
Zn²+ confirmed

(2biii)
TEST: Portion of filtrate of Ba(NO3)2 + HCL
INFERENCE: SO4²- or CO3²- present.
SO4²- confirmed.

=====================================

(1a)
VA=11.30cm³
CA=5.3gldm³
VB=25.0cm³
CB=Ygldm³
HCl(aq)+NaOH(aq)----->NaCl(aq)+H²O(i)
For acid NA; NB =1;1

(1ai)
Conc of A in moldm-³
=conc of A in gldm-³/molar mass in glmol
=5.3/36.5
HCl=>1+35.5=36.5glmole
=0.145moldm-³

CAVA/CBVB=NA/NB
0.145*11.30/CB*25.0=1/1
1.6385=25CB
CB=1.6385/25
CB=0.06554moldm³

(1aii)
Conc of B in moldm-³=
Conc of A in gldm-³/molar mass in glmol

Molar mass of NaOH
=Na+O+ H
=23+16+1
=40glmol .
0.066=y/40
y=0.066*40
y=2.64

(1aiii)
HCl+NaOH----->NaCl+H²O
1mole of HCl give 1mole NaCl

1.6385mole
n=CV
=0.145*11.30
=1.6385mole
No of mole =mass/molar mass
1.6385=mass/58.5
Molar mass of NaCl=58.5glmole
Mass of NaCl =58.5*16.385
=95.85g

(1bi)
The indicator used is methyl orange because the titration is between the strong acid and strong base

(1bii)
Orange color would be shown at the end point .
=====================================

(3a)
-Glucose-
The most important monosaccharide is glucose, the body’s preferred energy source. Glucose is also called blood sugar, as it circulates in the blood, and relies on the enzymes glucokinase or hexokinase to initiate metabolism.

-Sucrose-
Sucrose is commonly known as table sugar, and is obtained from sugar cane or sugar beets. Fruits and vegetables also naturally contain sucrose.

(3bi)
(i)potassium iodide
(ii)throsulphate

(3bii)
Starch indicator

(3biii)
(i)before end point ----> dark color
(ii)at the end point ----> colourless

(3c)
(i)soda lime is preferred because it does not attack rubber nor dry.
(ii)it is not deliquescent
=====================================


How do I get 2020 GCE WAEC chemistry practical answers BEFORE THE EXAM?
. You can get 2020/2020 Exam answers directly from examplaza.com, visit HERE NOW
Tags:

Site: Related Posts

FQA - 2022 EXAM Runs Site

What is the pass mark for Waec?

What is the pass mark for Waec?

WAEC grading systemGradesDefinitionInterpretationC5Credit55% - 59%C6Credit50% - 54%D7Pass45% - 49%E8Pass40% - 44%5 more rows

Which month is Waec?

This examination is offered during summer (April to May), and the results are available by August.

This examination is offered during summer (April to May), and the results are available by August.

Can you cheat on online exams?

The researchers found that while 32.1% of respondents admitted to cheating in a face-to-face class, 32.7% admitted to cheating in an online course. ... Another study took another tack in establishing how common cheating in online exams is, as compared to face to face exams.

waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

What is a distinction in Waec?

... is externally organized and graded by the West Africa Examinations Council (WAEC), which clas- sifies candidates who obtain BECE Aggregate 6 to 12 as "distinction" or "good" students, Aggregate 13 to 24 achiev- ers as "average," and Aggregate 25 and above achievers as "weak" students (Asihene, 2009;Dorleku, 2013; ...

... is externally organized and graded by the West Africa Examinations Council (WAEC), which clas- sifies candidates who obtain BECE Aggregate 6 to 12 as "distinction" or "good" students, Aggregate 13 to 24 achiev- ers as "average," and Aggregate 25 and above achievers as "weak" students (Asihene, 2009;Dorleku, 2013; ...

What is the date for Waec 2020?

According to the timetable, the West African Senior School Certificate Examination (WASSCE) for school candidates, 2020, will commence on 6th April, 2020 and will end on 5th June, 2020.

WAEC Exam Date: According to the timetable, the West African Senior School Certificate Examination (WASSCE) for school candidates, 2020, will commence on 6th April, 2020 and will end on 5th June, 2020.

Is a grade D at O level a pass?

Results which met the Ordinary standard (grades 1-6) were recorded as Pass. ... Grades D and E indicated a lower standard of attainment, but were still judged sufficient to be recorded on the certificate. Grade E or below was ungraded and not recorded on the certificate.

waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

How can I pass a math test without studying?

waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

How can I prepare for Waec?

waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam

How much is NECO 2020?

NECO registration form 2020 price is Eleven Thousand , Three Hundred And Fifty Naira Only (N11,350) Nine Thousand, Eight Hundred And Fifty Naira Only (N9,850) following the reduction of JAMB UTME form price and NECO form price in 2021.

waec expo runs is real. WAEC Answers, NECO ANSWERS and GCE answers comes a night before exam or Hours before exam
Ezeimo Chinaza said: Am Ezeimo Chinaza, I used examplaza for waec in 2018, thanks my result was nice... view all reviews