CLASS: SS1 |
TERM: FIRST TERM |
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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