A GEMS SCHOOL
TOPIC: METALS AND NON-METALS GRADE:8
Note: Revise the symbols and valency of metals and non-metals. Q1.What would you observe when you put a) Some zinc pieces into blue copper sulphate solution? b) Some copper pieces into green ferrous sulphate solution? c) An iron nail into blue copper sulphate solution? Q2.Complete and balance the following equations: a) Zn + O2 b) Pb + O2 c) Cu + O2 d) Mg + H2O e) Al + HCl f) MgO + H2O g) K2O + H2O h) Cu + HCl __________________ _____________________________
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Q3. Give one example of each: a) b) c) d) e) f) g) An acidic oxide A basic oxide An amphoteric oxide A neutral oxide A metal and a non-metal which are in liquid state at room temperature. An element stored in kerosene. A soft metal that can be cut through knife.
Q4.Define the following terms: a) Single displacement reaction b) Electrical conductivity
c) Ductility d) Malleability e) Sonority Q5.Samples of four metals A,B,C and D were taken and added to the following solution one by one.The results obtained have been tabulated as follows: Metal A B C D Ferrous Sulphate No reaction Displacement No reaction No reaction Copper Sulphate Displacement No reaction No reaction No reaction Zinc Sulphate No reaction No reaction No reaction No reaction Silver Nitrate No reaction No reaction Displacement No reaction
Use the table above to answer the following questions about metals A, B, C and, D. i. Which is the most reactive metal? ii. What would you observe if B is added to a solution of copper sulphate? iii. Arrange the metals A, B, C and D in the order of decreasing reactivity.