Protected: WAEC 2018/2019 Chemistry Practical Obj and Theory/Essay Free Questions & Answers

BETTER STILL CONTACT THE ADMIN OF VERIFIED WAEC2018/19
ON 09036880531

Refresh this page after 2 minutes KEEP REFRESHING THE PAGE TIME TO TIME WE WILL GET TO YOU GUYS SOON JUST STAY CALM TO GET THE BEST ANSWERS HERE
1.Chemistry practical Answers(1ai)Burrette readings/cm3:|titre 1|titre2|titre3Final readings |33.20 |49.60 |1.50Initial readings |16.40 |16.40 |16.65(1aii)Average volume of acid used= 16.40+16.40+16.65(cm3)/3=49.45cm3/3=16.48cm3(1b)(I) Concentration of Y(OH)2.XH2O in mol/dm3Using CAVA/CBVB = a/bCA= 0.025mol/0.25dm3 = 0.1molVA = 16.48cm3CB = ?VB = 25.00cm3a = 1molb = 2 moles.:. CAVA/CBVB =a/bCB = CAVA*B/VB*a= 0.1 mol/dm3 * 16.48cm3 * 2 moles / 25.00 * 1 molCB = 3.296/25CB = 0.131mol/dm33a)I)Desiccator- usefor preserving moisture sensitive itemsii)Volumetric flasks are used for precise dilutions andpreparation of standard solutions.iii)Glass rod are used to mix chemicals and liquids forlaboratory purposes .3ii)i)Amphoteric is Al2O3ii)Neutral oxide is H2O3iii)Crystallization3b.1. hno3aq to cuco3 solid. a light blue solid,precipitates is formed2. acidified kmno4 to c2h4. c2h4 is oxidized toethane-1,2-diol3. iodine solution to a paste of unripe plantain. abluish-black color is produced with iodineStay update……..
Comment