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Account for the following: a. Aluminiu...

Account for the following:
a. Aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.
b. Solder is used for welding electrical wires together.

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a. When aluminium is exposed to air, it reacts with oxygen an an oxide layer is deposited on its surface, this oxide layer acts as a barrier for further oxidation.
b.solder easily melts and solidifies when cooled, hence it is used to bind the wires in an electricial circuit.
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ZEN PUBLICATION-METALS AND NON METALS-ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER [SA] TYPE 1 QUESTIONS)
  1. a. Name the solvent in which ionic compounds are generally soluble. ...

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  2. Give Reason: a. Prior to reduction of the metal, sulphides and metal...

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  3. Account for the following: a. Aluminium is more reactive than iron, ...

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  4. Explain the following: a. Reactivity of Al decreases if it is dipped...

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  5. In joining railway tracks or cracked machine parts, reaction of Fe(2)O...

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  6. What is cinnbar ? How is a metal extracted from cinnabar ? Explain bri...

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  7. Distinguish between calcination and roasting.

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  8. Write composition of the following alloys:

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  9. Two metals P and Q react with oxygen to form their respective oxides w...

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  10. Of three metals X, Y and Z. X reacts with cold water, Y with hot water...

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  11. The atomic number of two elements A and B are 8 and 12. Write the sym...

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  12. A metal that exists as a liquid at room temperature is obtained by hea...

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  13. Give the reaction involved during the extraction of zinc from its ore ...

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  14. Give reason a. Platinum, gold and silver are used to make jewellery....

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  15. Write one example for each: a. A metal which is so soft that, it can...

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  16. Name the following : (i) Metal, which is preserved in kerosene. (i...

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  17. Name a metal/non-metal : (i) Which makes iron hard and strong ? (i...

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  18. Write chemical equations that show aluminium oxide reacts with acid as...

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  19. When a metal X is treated with cold watr, it gives a base Y with molec...

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  20. Which of the following metals can displace zinc from its salt solutio...

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