2006
Burette reading (initial and final) must be given to two decimal places. Volume of pipette used must be recorded but no account of experimental procedure is required. All calculations must be done in you answer book.A is…
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2006 WAEC SSCE Chemistry Past Questions
2006
Credit will be given for strict adherence to the instructions, for observations precisely recorded and accurate inferences. All tests, observations and inferences must be clearly entered in your als book, in ink, at the…
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2006
(a) Consider the following compounds: MnO\(_2\), NaHCO\(_3\), Na\(_2\)CO\(_3\), NH\(_4\)CI cnd Pb(NO\(_3\))\(_2\) Select the compound(s) which;(i) has a black colour(ii) is a basic oxide:(ii) sublime on heating(iv) disso…
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2006
(a)(i) Draw the energy profile diagram for the reactionH\(_{2(g)}\) + I\(_{2(g)}\) ---> 2HI\(_{(g)}\) \(\Delta\) = 13 kJmol\(^3\)(ii) If the concentration of HI increases from 0 to 0.001 mol dm\(^3\) in 50 seconds, wh…
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2006
(a)(i) Draw and label a diagram to illustrate the preparation and collection of dry chlorine gas in the laboratory.(ii) List two uses of chlorine.(b)(i) Explain why river water flowing through an industrial town may be u…
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2006
(a) A solution of CuSO\(_4\) was electrolyzed between pure copper electrodes and the following results were obtained:Mass of copper anode before experiment = 7.20 gMass of copper anode after experiment = 4.00 gMass of co…
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2006
(a) State the following laws of chemical combination: (i) Law of constant composition (ii) Law of multiple' proportion.(b) Copper reacts with oxygen to form two oxides X and Y. On analysis, 1.535 g of X yielded 1.365 g c…
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2006
(a)(i) State two differences betwecii the properties of solids and gases(ii) What process does each of X, Y and Z represent in the changes shown below?(b)(i) State Charles' Law (ii) Draw a sketch to graphically illustrat…
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2006
a) Define each of the following terms and indicate one use of each:(i) Nuclear fission; (ii) Nuclear fusion.(b) Alpha particle emission by \(^{293}_{25}U\) proceduces an element A. Beta particle emission by the particle…
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2006
If 1 mole of sodium contains 6 x 1023 atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]
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2006
An atom 23892X decays by alpha particle emission to give an atom Y. The atomic number and mass number of Y are
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2006
An element X has isotopic masses of 6 and 7. if the relative abundance is 1 to 12.5 respectively, what is the relative atomic mass of X?
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2006
How many orbitals are in the d-sub shell?
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2006
The indicator used in neutralizing CH3COOH and NaOH solution has pH range of
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2006
Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?
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2006
Which of the following processes is an endothermic reaction?
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2006
Considered the reaction: H+(aq) + OH -(aq) → H2O(l). The energy change taking place in the reaction above is enthalpy of
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2006
Consider the reaction represented by the equation. 2NaHCO3(s) \(\rightarrow\) 2Na2CO 3(S) + CO 2(g) + H2O(g) what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO3 is heated? [Molar volume = 22.4 d…
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2006
The oxidation number of iodine in the iodate ion (IO -3) is
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2006
Electrolysis is applied in the following processes except
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