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100% NECO 2014 Chemistry Answers Available Here

ANSWERS<br />
1a)<br />
Atomicity is the number of atoms in a molecule of an element<br />
1aii)<br />
Mass number of an element is the sum of the proton number and<br />
the neutron number<br />
1aiii)<br />
Isotopy is the existence of atom of the same element that have<br />
the same atomic number but different mass number<br />
1bi)<br />
The reaction is a displacement reaction because Zinc will<br />
displaced hydrogen from hydrochloric acid because it is above hydrogen<br />
in the activity series.<br />
There is an effervescence hydrogen gas is given off the gas is<br />
collected over water because it is insoluble in water<br />
Zn + Hcl ----------- Zncl2 + H20<br />
1bii)<br />
It is used in filling ballons because it has a low density<br />
* it is used in hardening Fat and oils in the manufacture of margine<br />
and other solid fats<br />
* it is used in the manufacture of ammonia in the harber process<br />
1c)<br />
Molar mass of HNO3 = 1 + 14 + (16)3 = 63g/mol<br />
% of oxygen = (16)3/63 x 100% = 76.19%<br />
1d)<br />
* copper<br />
* iron<br />
* Tin<br />
* Aluminium<br />
1e)<br />
* Sodiumtetrahy-droxozinate(ii) --------- Na2Zn(OH)4<br />
* sodiumoxonitrate(iii) --------- NaNo2<br />
1eii)<br />
Used in soap making<br />
* used to soften hard water<br />
* used as fertilizer<br />
* sodium chloride is used as preservative for meat and fish<br />
2a)<br />
cassiterite<br />
2aii)<br />
Sn02 + 2c(s) -------------> Sn(s) + 2CO(g)<br />
2aiii)<br />
* Ethanoic acid from vinegars<br />
* Tartaric acid from grapes<br />
* Lactic acid from milk<br />
* Amino acid from protein<br />
2bi)<br />
* used in making cooking utensils<br />
* used in making alloy<br />
* used in making overhead electric cable<br />
2bii)<br />
* Increasing the concentration<br />
* Increasing the temperature of a system<br />
* Increasing the surface area of magnesium<br />
2biii)<br />
Mg + 2HCL -------------> Mgcl + H2<br />
2c)<br />
* Downward delivery or upward displacement of air<br />
* hydrogen chloride gas<br />
* ammonia gas<br />
* solubility<br />
2di)<br />
The heat involved when one mole of substance is burned completely in<br />
oxygen under standard condition<br />
(2dii)<br />
DG = DH - TDS<br />
= -710 - (300 x 0.15) = -755kg/mol<br />
(2diii)<br />
* It alters the rate of chemical reactions<br />
* it is specific in action<br />
* it cannot start a reactions<br />
* it has no effect on the equilibrium position of a reversible reaction<br />
3a)<br />
* Double decomposition reaction<br />
* Redox reaction<br />
* Displacement reaction<br />
3bi).<br />
(I) R - OH (ii) R - COOH (iii) R - C=O-R<br />
Where R= alkyl group = CnH2n+1<br />
3bii)<br />
CnH2n-2<br />
3biii)<br />
* All members can be prepared by the same general method<br />
* They have similar chemical properties<br />
* They share same general molecular formula<br />
* Each successive member differ by -CH2<br />
3ci)<br />
* Hydrogentetraoxosulphate(vi)acid [ H2So4 ]<br />
* Hydrogentrioxonitrate(v)acid [ HNO3 ]<br />
* Hydrochloric acid [ HCL ]<br />
3cii)<br />
Ethanol ,<br />
* propan-2-ol<br />
3d)<br />
19A 1s2, 2s2, 2p6, 3s2, 3p6, 4s1<br />
9B 1s2, 2s2, 2p5<br />
3dii)<br />
Electovalent bond<br />
3diii)<br />
Soluble in water<br />
* Insolube in organic solvent<br />
* Conduct electricity in aqueous<br />
3e)<br />
diff in solubility from 100oc to 15oc = 39.8 - 35.9= 3.9g<br />
I.E solute deposited on cooling, on cooling from 100oc to 15oc,<br />
Mass involved at 100oc= 39.8g + 1000g of water = 1039.8g<br />
Mass involved at 15oc= 35.9g + 1000g of water = 1035.9g<br />
Ie 1039.8g of saturated solution deposited 3.9g of solute.<br />
Ie 80g of saturated solution deposite -------- 3.9 x 80/1039.8= 0.30g of water<br />
4a)<br />
Allotropy is the existence in the same physical state of two or<br />
more structural forms of the same element<br />
4aii)<br />
Rhombic sulphur<br />
* Monoclinic sulphur<br />
* Amorphous sulphur<br />
* Plastic sulphur<br />
4b)<br />
cracking process<br />
* C8H18 - octane<br />
* It reduce knocking<br />
4c)<br />
Addition polymerization<br />
* Condensation polymerization<br />
4cii)<br />
hardness of water ia a suitation whereby water does not lather<br />
easily with soap<br />
4d)<br />
octane salting is a figure indicating the antiknock properties of<br />
a fuel based on a comparison with a mixture of isoctane heptane<br />
4dii)<br />
Cracking: this is whereby complex molecule are broken down into<br />
simpler molecule. While,<br />
Reforming: is the process used to convest molecule having low octane<br />
rating into high octane liquid product<br />
4diii) Cu2+ + 2e- ----------> Cu<br />
2F ------------> 1 mole<br />
2 x 96500c ----------> 1 mole<br />
482.5c -------------> M/64<br />
2 x 96500 x M/64=482.5<br />
M= 0.16g<br />
4e) chlorofluoro carbon<br />
* Carbon(ii)oxide<br />
* Sulphur(iv)oxide<br />
5a) An aerosol is a colloid of fine solid particles or liquid droplets in air or another gas<br />
* An emulsion is a collided solution of liquid in liquid<br />
5aii) Haze. (ii) Milk<br />
5aiii) Harber process<br />
* Hydrogenation process<br />
5b) Fractional distillation<br />
5bii) High inflammable<br />
* insoluble in water<br />
* Good organic solvent<br />
5c) used in manufacture of HCL<br />
* for water purification<br />
* dyeing industry<br />
* manufacture of organic substance<br />
5cii) SOLID: molecule are fixed and tightly packed<br />
* It has a definite shape<br />
* they are compacted together<br />
LIQUID: molecule are loose<br />
* it takes shape of the container<br />
* it moves freely<br />
5d) HCL + NAOH --------> NACL + H20<br />
Ca=? , Va=20.30cm ie 20.30 x 10^-3dm3,<br />
Vb= 25 x 10^-3 , Cb=0.1<br />
Ca = 0.1 x 25x10^-3/20.30 x 10^-3<br />
Ca = 0.123mol/dm3

100% NECO 2014 Chemistry Answers Available Here

ANSWERS 1a) Atomicity is the number of atoms in a molecule of an element 1aii) Mass number of an element is the sum of the proton number...

Tecno phantom

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Pr<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghcRBx0wSIbT8aZ3d1rTFsp5tgqC6YXseTqhGW5AbhWKHKK-txFxinNO1milRW1MXYJ8Qy8F9VAYlOwsPn0JlQz7xX_VEXYikiGRvyN8LiuYrV4QZUxS34Zs_SRFwx8voVj76fkBz9FRie/s1600/Samsung+S4+and+Tecno+Phantom+A.jpg" imageanchor="1" style="clear: left; display: inline !important; margin-bottom: 1em; margin-right: 1em;">eview of The Tecno "Phantom A" - A steal for just 34,000 Naira ($212)</a></div>
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghcRBx0wSIbT8aZ3d1rTFsp5tgqC6YXseTqhGW5AbhWKHKK-txFxinNO1milRW1MXYJ8Qy8F9VAYlOwsPn0JlQz7xX_VEXYikiGRvyN8LiuYrV4QZUxS34Zs_SRFwx8voVj76fkBz9FRie/s1600/Samsung+S4+and+Tecno+Phantom+A.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><br /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghcRBx0wSIbT8aZ3d1rTFsp5tgqC6YXseTqhGW5AbhWKHKK-txFxinNO1milRW1MXYJ8Qy8F9VAYlOwsPn0JlQz7xX_VEXYikiGRvyN8LiuYrV4QZUxS34Zs_SRFwx8voVj76fkBz9FRie/s1600/Samsung+S4+and+Tecno+Phantom+A.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><span class="Apple-style-span" style="-webkit-text-decorations-in-effect: none; color: black;"><br /></span></a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghcRBx0wSIbT8aZ3d1rTFsp5tgqC6YXseTqhGW5AbhWKHKK-txFxinNO1milRW1MXYJ8Qy8F9VAYlOwsPn0JlQz7xX_VEXYikiGRvyN8LiuYrV4QZUxS34Zs_SRFwx8voVj76fkBz9FRie/s1600/Samsung+S4+and+Tecno+Phantom+A.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjigdzBrMghe2yrr8hpoWq-krsLzwJPa5meL764e_CBDQzNXIzRzf5kwn01RwWV7eKr5LBaMJxeOqv5FVAd1FjYypnHqxYsnFfL_oTm5A5fpEFzO7wrpVSYeBdA03E9CjbVk1lXIAp2fV3s/s640/Tecno-Phantom.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjigdzBrMghe2yrr8hpoWq-krsLzwJPa5meL764e_CBDQzNXIzRzf5kwn01RwWV7eKr5LBaMJxeOqv5FVAd1FjYypnHqxYsnFfL_oTm5A5fpEFzO7wrpVSYeBdA03E9CjbVk1lXIAp2fV3s/s320/Tecno-Phantom.jpg" width="320" /></a></div>
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must confess that this is my first Tecno Phone. I honestly didn't know what to expect. But as I opened the pack, I saw enclosed a 3G Android Dual SIM Phone, a Tecno Power Bank (MPB02), a Flip Case, a Tecno 12+1 monthsWarranty and the normal accessories. All these for just N34,000; I must say this is quite a steal.</div>
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Let's talk about the Power Bank first. This is a portable power bank with capacity up to 2200mAh. It can be regarded as a charger or a back-up battery with USB output which can be used to charge a mobile phone, MP3, PDA, e.t.c.</div>
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The Flip Case is an alternative for the regular existing battery case. So if you are concerned about your screen when you carry the Tecno Phantom Phone, you can use this Flip case alternative.</div>
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Now to the phone - My first impression was that it reminded me of the Samsung S4. What do you think from the picture below?</div>
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The Tecno Phantom A and The Samsung S4</div>
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The Techno Phantom A, also known F7, comes with an 8.0 MP camera, a 5 inch HD Touch screen and is equipped with Android 4.1 OS (JellyBean). It has a 1.0 dual core Qualcomm Snapdragon S4 processor with 1.0GB RAM.</div>
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The Phone comes ready with Facebook, Opera Mini, Whatsapp, Google Maps, YouTube and Play Store where users can download over 800,000 innovative and interesting apps.</div>
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Though announced in May 2013, the Tecno Phantom A was released June 2013 in partnership with Etisalat Nigeria.</div>
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At the event, the Public Relations Manager, TECNO Global, Mr. Mounir Boukali, had this to say “It was our objectives to enable Nigerians acquire smartphones and enjoy a smart life with the TECNO Phones. Now, with the Phantom A, we are offering a superior smartphone with high-end performance and a better user experience.”</div>
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He also went on to say that the “Phantom A is the first phone made in collaboration with our two special teams: French designers and Korean ingeniors.” The smartphone comes with high-performance features with rich smart experience which allows users to make a balance between their work and personal lives.</div>
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Also at the event, the Director of Products and Services - Lucas Dada had this to say “Existing customers that want to be part of the 12 months free internet access should insert their existing Etisalat SIM cards into the phone and text ‘High’ to a short code, ‘8186’, to receive instant free internet access for 12 months.”</div>
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I do believe this is one of the most affordable smartphones in the Nigerian market.</div>
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I would follow up this post after some days with the phone. Watch out.</div>
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Tecno phantom

Pr eview of The Tecno "Phantom A" - A steal for just 34,000 Naira ($212) must confess that this is my first Tecno Phone....