Chemistry Senior Secondary School Exam Questions for Class (I) in Lagos State

1.  One of the following is not a chemical change (a)rusting (b)sublimation of solids (c)slaking of quicklime (d) fermentation of glucose
2.  The separation of magnetic substances from non magnetic ones is termed(a) separation techniques (b) magnetization (c) magnetic separation (d) all
of the above
3.  Sieving is an example of _______________

4.   The smallest unit of matter is termed (a)atom (b)molecule (c) substance(d) ions
5.  John Dalton proposed the atomic theory in what year________
6.  The mass of one mole of any substance expressed in grams is termed (a)mole (b)molar volume (c) molar mass (d) atomic mass
7. What is the mass of 3moles of oxygen gas
(O2=16g) (a) 4g (b)10g (c)90g (d)96g
8. The empirical formular of a compound is _____________
9.      __________is the combining power of an element (a) atom (b) valence electron (c) valency (d) oxidation state
10.The atomicity of oxygen is (a) 3 (b)2 (c)6 (d) none of the above
11. The relative molecular mass of H2SO4 is
_____________ given that (S=32, O=16, H=1 (a)5 (b)90 (c)98 (d)100
12.The empirical formular of C6H6 is ___________(a)CH(b)C2H4 (C)C4H (d) All of the above
13.  The percentage composition by mass of Nitrogen in NaNO3 is ________
14.  An element with the symbol P is
15.  The amount of a substance which contains as many elementary entities as contain in C-12 is ___________
16.  Which element has the latin name cuprium (a) copper (b) cupper (c) nickel (d) scandium
17.  ______________measures the mass of an isotope (a) mass isoelecton (b) electronic balance (c) mass spectrometer (d) chamber of mass
18.  Calculate the relative molecular mass of limestone (Ca=40, C=12 O2=16)_______
19.  Chemistry is defined as ________________
20.   The change of state from solid to gas is termed _____________
Section B. Theory:Instructions (Answer all questions)
1.  What are chemical equations, show examples
b. Balance the reaction between HCL + Na —————-NaCl + H2
C. Define atomic mass
D. List four importance of chemistry
2.State the four laws of chemicalcombinations
b. Find the empirical formular of a compound which on analysis, gave  2.0g of Carbon,  0.70g Hydrogen  and 3.0 gram of Oxygen.
3.Differentiate between physical change and chemical changes with four examples each
b. define empirical formular
c. List the first 20 elements
4. Differentiate between  compound and a mixture
b. Define the term mole
c. Calculate the mole of 14 grams of Nitrogen, given that the molar mass of Nitrogen is 14g/mol
5.List and explain the basic process involve in conducting scientific research
b. Calculate the percentage by mass of the entire element in sodiumtetraoxosulphate (vi) Na2SO4.
(S=32, Na=23, O=16)
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