WAEC 2020 Chemistry Practical Answer – Aug/Sept Expo

WAEC Chemistry Practical Solution Questions and Answer – AUG/SEPT 2020 Expo Runz.

Kindly use your school endpoints.

(1a)
Burette reading (cm)³|1st reading|2na Reading|3rd reading|
Final |15.25|30.53|45.79|
Initial |0.00|15.25|30.53|
Volume of acids used |15.25|15.28|15.26

Average volume of acid used =15.25+15.26/2
=15.255cm³
=15.26cm³
Or =15.27cm³

(1b)
Given; mass con of A =5g/500cm³ = 5g/0.5dn³
CA=10g/dm³
A is HNO3
Therefore molar mass =1+14+(16*3)=15+48=63g/mol¹

Molarity of A = gram con/molar mass
CA=10/63=0.1587mol/dm3

(1bii)
Using CAVA/CBVB =Na/NB
With reacting equation ; HNO³ + NaOH---NaNO3+H2O
nA=1 nB=1
0.1587*15.26/CB*25.00=1/1
25CB=0.1587*15.26
CB=0.1587*15.26/25
CB=0.09687mol/dm³

(1biii)
B is NaOH
Molar mass
23+16+1=40g/mol
Conc of B in g/dm³=molarity * molar mass
= 0.09687*40
=3.8748g/dm³

(1biv)
No of moles present in 250cm³ of NaOH is =molar conc * volume
=0.09687*250/1000
=0.0242moles
Mole ratio of NaOH and NaNO3 is 1;1
No; of mole of NaNO3 which reacted is 0.0242
Mass of NaNO3 formed =molar mass * no; of moles
=85*0.0242
=2.05grams
CLICK HERE FOR THE IMAGE
CLICK HERE FOR THE IMAGE

---

(2a)
TEST: C+burning splint

OBSERVATION: Sample C burst into flame .It burns with non smoky blue flame without soot. Colorless gas that turns wet blue litmus paper faint red and turns like water milky is present.

INFERENCE: C is volatile and flammable. The gas is CO2 from combustion of saturated organic compound.

(2bi)
TEST: C + distilled water + shake

OBSERVATION: Clear or colorless solution is observed

INFERENCE: C is miscible with water

(2bii)
TEST: C + Acidified K2Cr207

OBSERVATION: Orange color of K2Cr207 solution turns pale green and eventually pale blue on cooling

INFERENCE: C is a reducing agent

(2d)
Compound belongs to the class of secondary alkanol
CLICK HERE FOR THE IMAGE

---

(3)
CLICK HERE FOR THE IMAGE

(3ai)
Zinc nitrate

(3aii)
2 Zn(NO 3 )2 ----->2 ZnO + 4 NO 2 + O 2

(3aiii)
It turns white when cold from it yellow colour when it was hot

(3b)
Pipette / measure 50.0cm3 of the stock solution into a 250
cm3 volumetric flask (containing some distilled water). Shake / swirl and add more distilled water until the mark is reached.

(3c)
Al2(SO4)3 - turns blue litmus red

---

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

Nsu.ng send all exam expo answer earlier than others

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

WAEC ssce 2020 Chemistry Practical expo answers, Ssce 2020 Chemistry Practical objective and essay Expo answers now available, aug/sept Chemistry Practical theory Answers for 2020, Chemistry Practical obj and theory Questions WAEC Ssce Expo Answers Here, Free wassce Chemistry Practical objective, essay & theory correct Expo 2020 answers Runz WAEC Chemistry Practical, WAEC Ssce 2020 Free Chemistry Practical essay, obj and theory Questions and Answers Expo for WAEC Chemistry Practical Paper 1 and Paper 2 objective and essay Questions and Answers Expo Now Posted, Free Chemistry Practical objective ans for internal ssce, see WAEC ssce expo Chemistry Practical obj and theory, essay questions for free, loadedexpo correct wassce Economics ans, sure WAEC ssce Chemistry Practical objective answers runz runs expo free real and correct WAEC ssce 2020 Aug/Sept Chemistry Practical free expo runz runs ans answers online for free see free answers online, 2020 Verified WAEC Free Ssce Chemistry Practical Obj and theory Answers have been posted REAL WAEC SSCE Chemistry Practical QUESTIONS & ANSWERS Direct To Phone Number AS Text message, RE: 2020 WASSCE Chemistry Practical (Expo) WAEC 2020 certified runs Chemistry Practical questions and answers WAEC SSCE January/February 2020 Chemistry Practical THEORY / ESSAY / OBJ QUESTION AND EXPO I need WAEC ssce free expo site, how can I get WAEC Chemistry Practical answer for free, WAEC 2020 Chemistry Practical essay, Objective And Theory Question and Answer Now Posted, Real 2020/2021 aug/sept wassce WAEC Chemistry Practical objective, essay and theory 100% correct expo questions and answers runz chokes runs, verified 2020 WAEC Chemistry Practical theory, essay and obj WAEC Chemistry Practical expo website, WAEC ssce Chemistry Practical live cheats, sure January/February WAEC SSCE 2020 Chemistry Practical original objective, theory and essay questions and answer now available here, 100% WAEC ssce Chemistry Practical expo, 2020 wassce Chemistry Practical obj, essay and theory runz now posted, correct WAEC ssce Chemistry Practical objective, essay (theory) answer now ready, free 2020 wassce Chemistry Practical obj, theory and essay best expo site WAEC ssce Chemistry Practical questions and answers, password for certified WAEC ssce Chemistry Practical essay theory obj expo, how to get/ where to get wassce Chemistry Practical theory, essay and objective expo answer direct to my phone as text message, trusted WAEC ssce Chemistry Practical questions and answer, i need WAEC Ssce aug/sept Chemistry Practical essay theory objective obj Expo 2020 answers on whatsapp, gidifans Chemistry Practical answer, solutionclass Chemistry Practical answer, 042tvseries Chemistry Practical answer, codedexam WAEC Chemistry Practical answer, wapbaze Chemistry Practical answer, wapextra Chemistry Practical expo, Martinlibrary Chemistry Practical expo, examgists WAEC Chemistry Practical expo, WAEC Chemistry Practical objectives answer, naija WAEC Chemistry Practical expo free answer

Real and Confirmed WAEC Chemistry Practical Questions and Expo Answer – Aug/Sept 2020

Verified WAEC 2020 Aug/Sept Chemistry Practical OBJ and Essay Answer and Solution to the questions.

GOODLUCK!!!

We appreciate you for reading On baze360, but we think it will be better you like our facebook fanpage and also follow us on twitter below.
Follow @Yloadedofficial

Are you an artiste? Do you want your music to go viral and reach a large number of audience? Promote your music on baze360 by clicking here. You can also advertise your product or brand by clicking here.