Nairaland Jamb Tutorial Centre {chemistry Thread} - Education (2) - Nairaland
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2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } / Nairaland 2016 Jamb Tutorial Classroom [chemistry Thread] / Nairaland Jamb Tutorial Centre. {NJTC} (2) (3) (4)
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| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by adebayour26: 4:58pm On Nov 29, 2014 |
Akerry:Thank you and I welcome you. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by adebayour26: 5:06pm On Nov 29, 2014 |
Mr DelePhd, Thank u for this piece, it will definitely help in this work. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Nobody: 6:03pm On Nov 29, 2014 |
class should start already!  |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by DelePhd: 6:52pm On Nov 29, 2014 |
adebayour26: You are most welcome! |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by faithugo64(f): 5:22am On Nov 30, 2014 |
nawa oo,time never reach?? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by DelePhd: 7:08am On Nov 30, 2014 |
Ladies and Gentlemen, with the kind permission of the author (O.J. OLAOYE) of the number one textbook for JAMB Chemistry/Biology (EXplicit Chemistry - A Revision Course & Explicit Biology - A Revision Course). You can now get a free copy of excerpt of the book in pdf. Interested prospective JAMBite writing Chemistry/Biology should send me a mail to methyldelene@yahoo.com with the subject, FREE EXPLICIT CHEMISTR/BIOLOGY PDF. N.B: Please don't drop your e-mail address here in other not to derail this thread. Goodluck! |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Alphonsocapone(m): 8:02am On Nov 30, 2014 |
chemistry is a very interesting course infact it is the most sweetest science subject. I will be an underground observer and may be chip in 1 or 2 tinz when the need arises. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by DelePhd: 8:18am On Nov 30, 2014 |
If you have received the free pdf book. Please feel free to discuss the content here. At least I won't be the only one over rating this book. Thanks. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 8:26am On Nov 30, 2014 |
faithugo64:don't give up, classes are for tuesday and fridays (9am-10pm).. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Dsd1pumpking(m): 7:00am On Dec 01, 2014 |
DelePhd:Wow, this is so great. But ,is there a whatsapp group to join to make it more easier to ask,read,answer questions AFAP? Plz help us create one |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Nobody: 9:47am On Dec 01, 2014 |
kuderrich:plz u cn teach at anytime. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 10:31am On Dec 01, 2014 |
Microflux:ok |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Kunlexic(m): 11:43am On Dec 01, 2014 |
kuderrich:what disturbs the class not to hold everyday or at anytime? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 12:55pm On Dec 01, 2014 |
Kunlexic:sorry, I've bn corrected. D class can nw hold everyday |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by stuff46(m): 1:13pm On Dec 01, 2014 |
Dsd1pumpking:you shouldnt have quoted the whole thinq na |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by bolaji3071(m): 3:56pm On Dec 01, 2014 |
please help me WHAT COURSE CAN I STUDY TO BECOME A CHEMISTRY TEACHER Chemistry OR Education and Chemistry And how many years course is it? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Nobody: 2:48am On Dec 02, 2014 |
following |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Avast(m): 10:26am On Dec 02, 2014 |
we are waiting....................... |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 12:36pm On Dec 02, 2014 |
Good afternoon class, it's good to be back again. Hw has being our day? Updates for the first class will drop soon, already typing. Thanks for your time. Pls letz inform our mate and those who went out. **** |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Pr0ton: 12:58pm On Dec 02, 2014 |
kuderrich: Waiting.. ACAP |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 1:52pm On Dec 02, 2014 |
As we’ve all know and according to our syllabus for this course, we’ll be starting with; TOPIC: Nature of matter Sub-Topic: separation Techniques What is matter? Matter can be defined as anything that has mass and occupies space. By this definition we can infer that everything in the universe is made up of matter e.g living and non-living things, air we breathe etc. Some questions might be running through our minds as regards the definition of matter ‘’anything that has mass’’ why not weight? No, it’s mass because mass of an object is d quantity of matter an object contains and is dsame everywhr in d world and d unit is kg while weight has to do with gravity and d unit is in Newton(N). PROPERTIES OF MATTER It’s divided into two; physical and chemical properties. Physical properties: it is associated with physical change; physical change is one which is easily reversed and in which no new substance is formed. E.g dissolution of common salt in water, melting of solid to liquid, freezing of liquid to solid, vaporisation of liquid to gases and sublimation of solid to vapours, also magnetization and demagnetization of iron rods. Chemical properties: This are properties which are involved when matter undergoes changes are a new substances are formed and it is also associated with chemical changes e.g rusting of iron, dissolution of metals and limestone in acid, addition of water to quicklime, fermentation and decay of substances and burning of substance. ELEMENTS, COMPOUNDS AND MIXTURES. Elements: An element is a substance which cannot be split into simpler unit by an ordinary chemical process. There are 109 known elements and 90 0f them occurs naturally while the rest are made artificially. Elements can be classified as metals, non-metals and metalloids. Compound: is a substance which contains two or more elements chemically combined together. Mixtures: A mixture contains two or more constituents which can easily be separated by physical methods. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by bolaji3071(m): 1:52pm On Dec 02, 2014 |
kuderrich: |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by bolaji3071(m): 1:54pm On Dec 02, 2014 |
[quote author=bolaji3071 post=28527829][/quote] WHAT COURSE CAN I STUDY TO BECOME A CHEMISTRY TEACHER Chemistry OR Education and Chemistry And how many years course is. have already choose EDUCATION AND CHEMISTRY hope am good to go? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by bolaji3071(m): 1:56pm On Dec 02, 2014 |
kuderrich: WHAT COURSE CAN I STUDY TO BECOME A CHEMISTRY TEACHER Chemistry OR Education and Chemistry And how many years course is. have already choose EDUCATION AND CHEMISTRY hope am good to go? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 3:39pm On Dec 02, 2014 |
SEPARATION TECHNIQUES[b/] A mixture contains two or more different substances. Each constituents of a mixture still retains its individual properties. This xteristic gives room for the separating of mixtures. [b]TYPES OF SEPARATION TECHNIQUES SIEVING: It is use to separate solid particles of different sizes. The mixture is placed on a sieve with a mesh of a particular size. Particles smaller than the mesh size of the sieve will pass through the sieve while the bigger particles remain on the sieve. MAGNETIC SEPARATION: A magnet is used to separate magnetic substance from non-magnetic particles. The method is used in the steel industry to remove magnetic impurities from tin ore. SUBLIMATION: when some solids are heated they change directly to gaseous state without passing through the liquid state. E.g iodine and ammonium chloride. DECANTATION: A mixture containing a liquid or solid particles separate into two distinct layers on standing; a lower solid layer and upper clear liquid layer. Using a glass rod the upper layer can be carefully poured or decanted into another container. This method is quick but usually not accurate in separating the mixture. FILTRATION: A porous material like filter paper can be used to separate insoluble particles from liquids. E.g suspension of chalk dust in water. The water pass through the filter paper and leave the chalk dust on the filter paper. CENTRIFUGATION: A centrifuge is a machine that spin test tubes containing suspensions at high speed. The spinning causes heavier solid particles in the suspension to be thrown into the bottom of the test tube. They settle there while the clear liquid separate out as an upper layer which can easily be decanted. DISTILLATION: it is used to recover a solvent from a solution. It is also used for separation of miscible liquids with widely unduly far apart boiling points. The solution is heated in a flask to vaporise the solvent. The vapour passes along a condenser which is cooled by circulating water in its outer jacket. This re-condenses the vapour into liquid called distillate, which is the collected in a receiver. The solute and other impurities are left behind in the flask. FRACTIONAL DISTILLATION: simple distillation cannot be used to separate a mixture of two or more miscible liquids. Fractional distillation is used to separate such mixtures into its component parts. The fraction distils over in ascending order of their boiling points, starting with the fraction with the lowest boiling points, for efficiency, the difference in the boiling points between successive fractions must be more than 10oc. Crude oil or petroleum contains many important natural products such as petrol, kerosene, diesel, heavy oil, natural gases and bitumen. Each of this product can be recovered in its pure form by fractional distillation. EVAPORATION: It can be used to recover a solid solute from a solution. A water bath or sand bath is used to bring about a steady rate of evaporation. The solute required is left behind while the solvent escapes into air as vapour PRECIPITATION: a difference in solubility of a solid in two different miscible liquids is used to precipitate th solid when it is dissolved in one of them. E.g iron(II) tetreoxosulphate(VI) is soluble in water but not in ethanol. If ethanol( which is miscible with water) is added to a solution of iron(II) tetraoxosulphate(VI) in water, the iron(II) tetraoxosulphate(VI) will be precipitated out of the solution and can be separated by filtration. CRYSTALLIZATION: it is used to separate salts, which decomposes easily on heating from their solutions. The salt crystals obtained pure and usually contain water of crystallization. The salt solution is first heated to evaporate some of the solvent. The solution becomes saturated. When the saturated solution is cooled, crystals of the solute begin to form. To induce crystal formation, crystal of thesame salt are added into the solution or inside of the beaker, vessel is scratched. This is one of the few practical class i love.hmmmmm FRACTIONAL CRYSTALLIZATION: it is used to separate two or more solid solutes which are present in the same solution in roughly equal amounts. The solubilities of different solutes in the given solvent must differ at different temperatures. During the cooling process, at a particular temperature, crystal of relevant solute will come out of solution, leaving behind the others which are still within limits of solubility. 2 Likes |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 3:46pm On Dec 02, 2014 |
bolaji3071:you can teach with both but chemistry Education if u rily av passion for teaching and both are four yrs course. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Victar(m): 4:21pm On Dec 02, 2014 |
keep up the good work. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by Avast(m): 5:10pm On Dec 02, 2014 |
DelePhd:have sent the mail |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 5:26pm On Dec 02, 2014 |
bolaji3071:yeh. U'll surely enjoy it. Wc schl did u chose? |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by bolaji3071(m): 9:16pm On Dec 02, 2014 |
kuderrich:University of Ibadan sir. |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 11:01pm On Dec 02, 2014 |
bolaji3071:that cool |
| Re: Nairaland Jamb Tutorial Centre {chemistry Thread} by kuderrich: 11:25pm On Dec 02, 2014 |
SEPARATING FUNNEL: A mixture of Petrol and Water do not mix together to form a single liquid, b’cos they are non-polar and polar solvent respectively. They rather separate out into two distinct layers when they are added. A separating funnel is useful here; d lower denser liquid layer is tapped off, leaving d upper less dense layer in d funnel. CHROMATOGRAPHY Chromatography uses a solvent moving over a porous absorbent medium (e.g paper or gel) to separate a solute. They are widely used to separate coloured as well as colourless substance ****************** QUESTIONS 1.A mixture of kerosene and diesel oil can be separated by............. 2. A mixture of Naphthalene and Candle will be separated by.......... 3. What property is used in choosing Fractional distillation as a separating technique for a mixture of fractions of crude oil? 4. Mention 2 differences between compound and mixture? 5. Which of the following is a mixture (a) Bronze (b) Ethanol (c) CO2 |
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