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WAEC GCE NOV/DEC 2017/2018 QUESTIONS AND ANSWERS

Discussion in 'Waec, Weac, Neco, Waec GCE And Neco GCE' started by Peptidebond, Jul 2, 2017.

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    GEO-Pract-Ans
    ================================
    6a)
    Delta is a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.
    6b)
    -The presence of a large catchment, or drainage, basin (the area where all run-off water drains to the river).
    -They all are at the mouth of large river systems that carry large quantities of clastic sediments (soils or portions of rocks that have been moved by water from where they formed).
    -They are not near geologically active coastlines. In order to have a large catchment basin, a very complex tributary system is necessary.
    6c)
    -The river must have large load. This will be possible if there is active erosion in the upper and middle stages.
    -There should not be extensive deposition in the middle stage e.g. presence of lake in between or high evaporation rate (first).
    -The river’s load must be deposited faster than it can be removed by the action of currents and tides.
    ================================
    4a)
    solar system is the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets
    4bi)
    i)Mercury is the innermost of the eight planets in our Solar System. It is the second densest major body in the solar system after Planet Earth and its density is slightly less than the density of Earth.
    ii)It orbits the Sun once in about 88 Earth days.
    iii)Its diameter is 4,878km at its equator, which is about two-fifths of Earth's diameter
    4bii)
    i)Composition
    The composition of the Earth consists of the solid and liquid portion and the atmosphere or gaseous portion.
    ii)The earth is spherical in shape
    iii)Size
    The diameter of the Earth at the equator is 12,756 km (7,926 miles), and its circumference or distance around the Earth at the equator is 40,075 km (24,901 miles).
    ================================
    7a)
    -Precipitation
    -Humidity
    -Temperature
    7b)
    -Elevation or Altitude effect climate. Normally, climatic conditions become colder as altitude increases.
    -Prevailing global wind patterns
    -Topography
    7c)
    i)Climate causes flood which destroy plants and buildings
    ii)Climate causes heat waves
    iii)Climate causes drought
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    Chemistry practicals•
    (1ai)
    Burette Reading(cm^3)| 1 | 2 | 3 |
    Final Reading |33.10|30.00|25.00|
    Initial Reading | 9.60|7.50 |2.40 |
    Volume of F used (cm^3)|23.50|22.50|22.60.

    (1aii)
    Average volume of F used
    =22.50 + 22.60 / 2
    =22.55cm^3

    (1bi)
    GIVEN:Molar Conc of Kmn04 =0.200mol/dm^2
    Volume of Kmn04 used =22.55cm^3
    Molar Conc of FeSo4. 7H2O=?
    Volume of FeSO4.7H2O=25cm^3
    Mole ratio of Kmn04 =1
    Mole ratio of FeSO4.7H2O=5

    Using,
    Molar Conc of KeSO4.7H2O x Volume(FeSo4.7H2O) =n(FeSO4.7H2O)/n(KmnO4)

    =molar Conc x 25 / 0.0200 x 22.55 = 5/1

    =Molar Conc. x 25=0.0200 x 22.55 x 5
    =Molar Conc =0.0200 x 22.55 x 5 / 25

    =Molar Conc =0.0902mol/dm^3

    (1bii)
    Molar mass of FeSO4.7H2O
    =56+32+(4*16)+7(18)
    56+32+64+126 = 278g/mol
    Conc of FeSO4.7H2O in gdm-3 = 0.0900*278
    =25.02gdm-3

    (1biii)
    Mass of FeSO4.H2O = 33.60-25.02
    =8.58gdm-3
    Percentage of FeSO4.7H2O = (8.58/33.60) * 100
    = 25.54%

    (1ci)
    Hydrochloric acid(HCL) is a mild reducing agent and so it will consume a certain amount of Kmn04 during titration. This will give a slightly higher value of Kmn04 consumption than the actual amount needed by the analyte

    (1cii)
    As Kmn04 is a dark purple colour solution, it is not possible to take readings from the button of the meniscus on the burette as in usual. Hence, the top, of the meniscus is used(visibility consideration)

    (1ciii)
    No indicator is used because Kmn04 serves as an indicator

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



    (2a)
    TEST|OBSERVATION|INFERENCE

    (2ai)
    TEST: A+distilled water and stirred
    OBSERVATION: A disolved in water
    INFERENCE: A is soluble in salt

    (2aii)
    TEST: A(aq)+litmus paper
    OBSERVATION: Turns blue litmus paper red
    INFERENCE: A is an acidiic salt

    (2aiii)
    TEST: A(aq)+NaOH(aq)- in drops, then in excess
    OBSERVATION: -White gelatinous ppt formed.
    -Precipitate soluble/dissolved
    INFERENCE: Pb^2+ or Zn^2+ or Al^3+ present
    Pb^2+ or Zn^2+ or Al^3+ present

    (2aiv)
    TEST:A(aq)+NH3(aq)- in dropss,
    -then in excess
    OBSERVATION: -White gelatinous precipitate
    -Precipitate insoluble
    INFERENCE: -Pb^2+ or Zn^2+ or Al^3+
    -Al^3+ present
    (2av)
    TEST: A(aq)+FeSO4(aq)+conc H2SO4
    OBSERVATION: Brown ring forms between the two solutions
    INFERENCE: NO3- confirmed

    (2bi)
    A is aluminium trioxonitrate(v)

    (2bii)
    Al(NO3)3

    (2c)
    TEST|OBSERVATION|INFERENCE

    (2ci)
    TEST: K+NaHCO3(aq)
    OBSERVATION: No visible reaction is observed
    INFERENCE: NaHCO3(aq) does not show result for alkanols(K)

    (2cii)
    TEST: K+benedict solution+heat
    OBSERVATION: There is no change in the colour of the benedicts solution
    INFERENCE: Benedicts solution is not an indicator for alkanols(K)

    (2ciii)
    TEST: K+KMnO4(aq)
    OBSERVATION: KMnO4(aq) solution changes from purple to colourless
    INFERENCE: Alkanol is being oxidized by KMnO4

    (2civ)
    TEST: K+CH3COOH+conc H2SO4
    OBSERVATION: pleasant fruity smell is observed
    INFERENCE: Esterification reaction has occured

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


    (3a)
    (i) Putsome distilled water in a beaker
    (ii) Measure 100cm^3 of 2.00mol/dm^3 of the stock solution by means of a burette and pour all the solution into the beaker containing the distilled water
    (iii) Stir the solution
    (iv) Transfer the solution into a 250cm^3 volumetric flask by means of a funnel
    (v) Ensure that all the solution in the volumetric flask has been transferred by thoroughly rinsing the inside of the beaker with distilled water
    (vi) Dilute the solution in the volumetric flask with distilled water until it reaches the 250cm^3 mark
    (vii) Shake the solution carefully

    (3b)
    (i) CH3COONa: It forms basic solution
    (ii) Al2(SO4)3: Acidic solution
    (iii) KNO3: Neutral solution

    (3c)
    Acidified potasium tetraoxomanganate(vii) KMnO4 was placed in the burette

    Goodluck
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    Economic-Theory
    3a)
    labour force is the process where by people who are ableto work in a country or area, or all the people who work for a particular company.
    3b)
    i)Structural unemployment refers to a mismatch between the jobs available and the skill levels of the unemployed.
    ii)Frictional unemploymentis when workers leave their jobs to find better ones. It's usually a voluntary exit but can also result from a layoff or termination with cause.
    3c)
    i)the population of the country
    ii)the population are fully employed
    iii)the available of good medical facilities
    iv)the total number of productive workers
    ================================
    5a)
    The money market is where financial instruments with high liquidity and very short maturities are traded. It is used by participants as a means for borrowing and lending in the short term, with maturities that usually range from overnight to just under a year.
    5bi)
    Treasury bill is a short-dated government security, yielding no interest but issued at a discount on its redemption price.
    5bii)
    Treasury certificate is another money instrument which and in the mobilization of savings, which is made available to the needy sectors of the economy.
    5c)
    i)To maintain monetary balance between demand and supply of short term monetary transactions.
    ii)Money market plays a very important role of making funds available to many units or entities engaged in diversified field of activities be it agriculture, industry, trade, commerce or any other business.
    iii)By providing funds to developing sectors it helps in growth of economy also.
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    Exons obj
    1BBACBBBDAD
    11DCBCCDACB
    21DABBABDBCB
    31ABAADADBDD
    41CBDCBBBCAD
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    *WAEC 2017 WITH-HELD RESULTS*

    this is to inform all candidates that participated in 2017 ssce(school waec) and they have their result WITH-HELD or they saw WITH-HELD result.
    We advice them to go and re-check their result again via waec checker portal.
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    *WAEC 2017 WITH-HELD RESULTS*

    this is to inform all candidates that participated in 2017 ssce(school waec) and they have their result WITH-HELD or they saw WITH-HELD result.
    We advice them to go and re-check their result again via waec checker portal.
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    STAY TUNNE FOR YOUR LIT-IN-ENG
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    Lit

    5)
    Mary is a very rich white girl who has far leftist leanings. She is a Communist sympathizer recently understood to be frolicking with Jan, a known Communist party organizer. Consequently, she is trying to abide, for a time, by her parents’ wishes and go to Detroit. She is to leave the morning after Bigger is hired as the family chauffeur. Under the ruse of a University meeting, she has Bigger take her to meet Jan. When they return to the house, she is too drunk to make it to her room unassisted and thus, Bigger helps her. Mrs. Dalton comes upon them in the room and Bigger smothers her for fear that Mrs. Dalton will discover him. Although she dies earlier in the story, she remains a significant plot element, as Bigger constantly has flashbacks during stressful times, in which he sees various scenes from her murder.
    ================

    [2)
    issues of child-neglect, child abuse, defilement of girls, gender, child-trafficking, child-labour, absent fathers, reproductive health risks, violence and failed governance through the grim experiences of street children. In Accra, MUTE, a non-governmental organisation seeks to unravel the mysterious death of Baby T, a child prostitute whose battered body was found in a slum behind a rasta hair salon kiosk. MUTE’s encounter with Fofo, Baby T’s sister opens an investigative trail into the lives of neglected children. Where do street children come from? Why are they on the street? Who are their parents? These are some of the questions answered unequivocally inFaceless.
    Firmly embedded inFacelessis the loud and clear message that parents should take responsibility for their children. More pronounced is the message that no child should be brought into the world without visible means of providing for him physically, financially, psychologically and emotionally.

    NO8) *THE ROLE OF MATILADA IN THE NOVEL*

    First and foremost, Matilda, the beautiful and good daughter of Manfred, is intrigued by the portrait of the young Alfonso the Good that hangs her castle. On the other hand, it is clear that she longs for someone like Alfonso in her life. She begins to get to know Theodore when he is imprisoned and realizes that he is a man of quality. Matilda has never been close to her father and is trying to figure out why he is so intent on bringing Isabella back to the castle.


    For instance, when all of the men leave the castle to find Isabella , Matilda frees Theodore and insists that he leaves the castle to save his life. She has noticed that Theodore resembles the picture of the former prince, Alfonso, and she falls in love with him. Before Manfred can find Isabella and force her to marry him , a huge entourage of knights and courtiers arrive in search of Isabella. One of the knights, unbeknownst to Manfred, is Frederic, Isabella’s father. When Theodore escapes the castle, he goes to a wood, and finds a cave.


    Equally important, he accidentally meets up with Isabella and vows to protect her. In the meantime, all of Manfred’s men and Vincenza, as well, are looking for Isabella. Additionally, Vincenza finds the cave, and Theodore fights with him, nearly mortally wounding the man, without realizing that Vincenza is Isabella’s father.
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    Literature OBJ:
    1-10: ADCDBCBDCD
    11-20: ACACDAAADA
    21-30: BDACCAADBC
    31-40: ACDBBBCADC
    41-50: ACCABBCBAD
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    DRAMA

    6)
    Travis represents the future of the Younger family. Hansberry drops some not-too-subtle on us when we hear that one of Travis's favorite pastimes is playing with rats. It kind of sucks when your "future" is hanging out with vermin. Mama and Ruth understand that if they stay living in their crappy apartment, Travis is destined to always settle for less than he deserves. the Younger family will never escape the slums. Travis's father, is planning to take the money from Mr. Lindner to not move into the white neighborhood, Mama insists that Travis stay and watch his father give in to "The Man." Travis's eyes are just too innocent, though, and Walter can't bring himself to do it in front of his son. If Travis saw this, Walter would always feel like a giant tool and a bad father.
    ==================================
    4)
    CHIEF ADE HALADU-AMAKA
    He is the Minister of External Relations and the epitome of corruption in the play. He is the ring leader of acriminal network of drug peddlers. He engages inbribery, large scale embezzlement of public funds,sexual immorality and fraud. His character is ironical.
    As a Minister of External Relations, he is supposed to promote his country’s image in the comity of nations. On the contrary, Chief Haladu-Amaka through his many vices portrayed his country in a bad light.
    ===================
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    DRAMA

    6)
    Travis represents the future of the Younger family. Hansberry drops some not-too-subtle on us when we hear that one of Travis's favorite pastimes is playing with rats. It kind of sucks when your "future" is hanging out with vermin. Mama and Ruth understand that if they stay living in their crappy apartment, Travis is destined to always settle for less than he deserves. the Younger family will never escape the slums. Travis's father, is planning to take the money from Mr. Lindner to not move into the white neighborhood, Mama insists that Travis stay and watch his father give in to "The Man." Travis's eyes are just too innocent, though, and Walter can't bring himself to do it in front of his son. If Travis saw this, Walter would always feel like a giant tool and a bad father.
    ==================================
    4)
    CHIEF ADE HALADU-AMAKA
    He is the Minister of External Relations and the epitome of corruption in the play. He is the ring leader of acriminal network of drug peddlers. He engages inbribery, large scale embezzlement of public funds,sexual immorality and fraud. His character is ironical.
    As a Minister of External Relations, he is supposed to promote his country’s image in the comity of nations. On the contrary, Chief Haladu-Amaka through his many vices portrayed his country in a bad light.
    ===================
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    CHEM Ans

    1a)
    Standard hydrogen electrode This is an electrode system which is normally used as a reference electrode, it is formed when hydrogen gas at 25c and pressure of 1 atm is bubbled through onr molar (1M) of Hcl.

    1b)
    Metals are good reducing agent because the are electro donors (metal ionizes by loss of electron)
    1c)

    i)Diamond is used in jewelry because they resist chemical attack and high temperature.
    ii)Diamond is used as abrassive because they are dense and hard.
    iii)Diamond is a non conductor of electricity because they lack free valence electron

    1di)
    Chemical change: this is a change which is irreversible and new substances are formed. They are mainly in form of chemical reaction.
    (1dii)example of chemical change.
    (I)rusting of iron
    (II)reaction of acid and Base to form salt and water

    1e)isotope: these are elements with the same atomic number but different mass number or atomic mass.

    1f) a weak acid is a substance which does not ionize or dissociate completely in solution. While a dilute acid is an acid with lower concentration, a dilute acid is formed when water is added to concentrated acid.
    1g) PH: this is the negative logarithm to the base ten(10) of hydrogen concentration
    Ph= -log10^H+

    1h) 1. It causes formation of acid rain
    2. It causes photochemical smog and ozone layer depletion
    (1i) Cl2 + Mgbr2 -> MgCl2 + Br2
    (1fi) By simple diffusion
    (1fii) Oxidation of the ethanol can be prevented by the removal of oxidizing agent such as Kmno4 or K2Cr2 or by the addition of lithium tetrahydrido aluminate(iii)

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    IMG-20170919-WA0085.jpg

    Attached Files:

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    (2ai) it's a group of atoms or type of bond possessed by certain organic compounds making them have some or similar chemical properties.
    (2aii)
    I. Ester
    II. Ethyl ethanorate
    (2bi)
    (I).Unsaturated hydrocarbon
    (II). Alkanol
    (III). Alkanoic Acid
    (2bii)
    (i) Acidified KMnO4 turns from purple to colourless
    (ii) A sweet smelling compound is produced
    (iii) Effervescence occurs with colourless odourless gas that turns lime water milky being evolved
    (2ci)
    I. O
    II. -1 and +1
    (2cii)
    I. 4H+ + No3— +3e— >NO + 2H2O
    II. Mass/molar mass = It/πe— * 96500c
    0.5/197 = 0.8*t/3*96500
    t= 0.5*3*96500/197*0.8
    t = 918.46s
    (2di) Group 2
    (II) X3N2
    (III) Beryllium
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    5a)
    chlorine
    /ammonia
    /hydrogen-
    chloride gas/carbon(II) oxide/sulphur(IV)oxide/nitrogen(IV) oxide
    5ai)
    because they are poisonous/
    have offensive smell
    /are dangerous to health
    5aii)
    1 Fused Calcium chloride is used in the manufacturing of plastics
    2 Fused calcium chloride and the production of calcium salt. It is used in the production of concrete..
    3 Fused Calcium chloride accelerates the curing (drying) speed of poured concrete.
    =================

    TYPING....


    4a)
    i)the law of conversation of matter states matter can neither be created nor destroyed but can be changed from one form to another.
    4aii)
    i)gases move randomly in a straight line colliding with one another and to the volume of the container
    ii)the volume occupied by the gas molecules are highly negligible when compared to the volume of the container
    iii)the collision between gas molecules are perfectly elastic
    4b)
    i)producer gas(mixture of Co and N2)
    ii)water gas(mixture of Co and H2)
    iii)H2O(g) + C(s) ----> CO(g) + H2(g)
    4ci)
    i)benzene
    ii)carbon(II)sulphate
    iii)tarpentine
    4cii)
    There will be the formation of metanol.The reaction is endothermic reaction
    4di)
    CaCO3->CaO+CO2
    4dii)
    (I) p=120Nm^-2=118.81atm
    V=0.25dm^3
    R=8.314JKmol^-1
    T=25C+273=298K
    Using PV=nRT
    =>n=PV/RT=(118.81*10^-5*0.25)/(8.314*298)
    But n=mass/molar mass
    =(29.7025*10^-5*)/(2477.572)
    =>Mass of gaseous product=44.29.7025*10^-5/2477.572
    =527*10^-6g
    (II)
    From the reaction, the moles of CaCo3 is the same as the mole of Co2; the number of moles of CaCo3
    = 1.198*10^-7mole
    But moles = mass/molar mass
    Mass = moles × molar mass
    Mass = 1.198×10^-7×100
    = 119.8×10^-7
    = 1.198×10^-5 moles
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