Thursday 13th June
Paper III & II: Objective & Essay Government 2hrs 40mins 2:00pm 4:40pm
This is actually the 2019 neco 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.
Refresh this page in every 5 minutes starting from 3 hours to the exam
Make sure you use your school titre value
For example, if your school uses 23.50
Our own solution centre may use 24.00
Pls don't be confused, just make adjustment from the beginning where you will need to find the *VOLUME. OF ACID USED(CA)*
EXAMPLES FOR 22.50cm³
Volume. Of acid used= 1st + 2nd + 3rd/3
=24.00+24.00+24.00 / 3
VOLUME. OF ACID USE for 25.00
VA= 25.00+25.00+25.00 DIVIDED BY 3
The volume or pipette used 25.00cm³
In a tabular form
Titrations |rough |1st|2nd|3rd|
Final reading |21.00|41.30|20.40|40.90
Vol of A used |21.00|20.30|20.40|20.50
Average volume of A = 20.30+20.40+20.50/3
H2X(aq) + 2NaOH(aq)-->Na2X(aq) + 2H2O(l)
Mass conc. of B = 1g/250cm³
= 1g/0.25dm³ = 4g/dm³
Molar conc. = mass conc./molar mass
= 4/(23+16+1) = 4/40 = 0.1mol/dm³
Using CAVA/CBVB = nA/nB
CA = CBVBnA/VAnB
CA = 0.1Ã—25Ã—1/20.4Ã—2
Concentration of A = 0.06127mol/dm³
(i)it might contain traces of impurities which must be removed before being weighed
(ii)it is hygroscopic which readily absorb moisture from atmosphere
1st line:|test|:Xn +distilled water,|observat
ion|:Xn dissolves in distilled water,|inference|:Xn is a soluble salt
= = = = = = = = = == = = = =
2nd line:|test|:1st portion+NAOH
= = = = = = = = == = = == =
3rd line:|test|:2nd portion+NH3 in drop and in excess,|observation|:deep blue ppt,|inference|
= == = = = = = == == = = = =
4th line:|test|3rd portion+BACL2,|
= = = = = = === = == = = == =
5th line:|test|:+ dil HCL,|observation|:insoluble in HCL,|Inference|:SO42-
Still the same
FILL IN THE TABLE:
Solution turns blue
Copper salt suspected.
Blue gelatinous precipitate
Insoluble in excess NaOH
Blue gelatinous precipitate
Soluble in excess NH³
Precipitate insoluble in excess
==â‰ =============â‰ ===================
(i)To give a sharp change in colour at the end of the acid base reaction
(i)the burette must be rinsed with the acid or allow it to drain after rinsing with distilled water
(ii)Air bubble must not be allowed in the burette
I. Hofmann voltameter.
II. Kipp's apparatus
Because silver nitrate is photosensitive (i.e.sensitive to light) Therefore,if the silver nitrate is left in sunlight or any bright light, it breaks down (hydrolyses) to give black/brown silver oxide and nitric acid.
NECO seems less difficult compared to WAEC but not also easy to make A's.
B3 is B (Very Good), C4 is C (Good), C5 and C6 are (Credit), D7 and E8 are E (Pass) and F9 is F (Fail).
Is Wassce equivalent to GCSE? Minimum of three passes at GCE A-level at grade C or above, and five passes at GCSE/IGCSE level at grade C or above, including English and Maths with equivalent qualifications such as African WAECs - 6 passes at grades 1-6, including Maths and English.
A1: 1 x 4 = 4 B2: 3 x 3.6 = 10.8 C4: 1 x 2.8 = 2.8 Total points: 4 + 10.8 + 2.8 = 17.6 Now, we divide the UTME by 8 i.e 280 ? 8 = 35 So, the aggregate score will be 17.6 + 35 + Post-UTME score.
Obtain N300,000 Cash Grant for your Education Now. Reasons Why NECO Result is Accepted for Study in Canada. You sure read that correctly, NECO result is accepted for study in Canada if you did't know.
To register for NECO examination, candidates are to obtain a draft and pay a non-refundable fee of Twelve Thousand Naira Only (N12,000) paid via bank draft or to school management if internal registration. The payment can be done in any NECO office, banks and Nipost offices nationwide.
2020 WAEC GCE Closing Date Update: West African Examination Council (WAEC) Senior School Certificate Examination (WASSCE) for Private Candidates (GCE) First (1st) Series [January/February] Registration Form Closing Date / Deadline for 2020/2020 Session [Extension Notice]. 2. UPLOAD OF PINs - Sunday, January 12, 2020.
The most effective practice is to work a short time on each class every day. The total amount of time spent studying will be the same (or less) than one or two marathon library sessions, but you will learn the information more deeply and retain much more for the long term?which will help get you an A on the final.
B2 = Secure grade B. B3 = Low grade B. C1 = High grade C. C2 = Secure grade C. C3 = Low grade C.