Give reasons for the following.
1. Why is sodium stored in kerosene and not in water?
2. What property makes graphite or charcoal suitable to be used inside a pencil?
3. What is a solder? What property of solder makes it suitable for joining electrical wires?
4. Can the solution of copper sulphate be stored in an iron container?
5. Can a wire be drawn out of wood?
Answers
Answer:
(1) sodium is a very high reactive metal. when is it kept in open sodium reacts with the o2 at room temperature ,to from sodium oxide . therefore its catches fire started burning when kept in open in the air . hence sodium is kept under kerosene to prevent its reaction with o2, moisture and co2.
(2) because it's very soft to easy to work with and it's relatively dark so it makes very good marks when it's rubbed against natural paper(which is easy to make), and because if it's ground and modified with other ingredients it's hardness can very easily modified so it can be marketed in a very wide range of pencils /leaseholders hardness.
(3) solder is fisubal metal alloy used to create a
permanent bond between metal workpiece .solder is melted in order to adhere and connect the pieces ,after cooling , which requires that an alloy suitable for use as solder have lower melting point than the pieces being joined.
(property of solder makes it suitable for welding electric wires. solder is an alloy of lead and tin. it is used for welding electrical wires. because of its low melting point . solder is an alloy of (Pband sn)
and has low melting point.
(4) No it's not a very good idea. Iron is more reactive than cooper and the iron wiil displace the cooper of its compound.
•the reaction is fe(s)+ cuso4(aq)= feSO4 (aq) +CU(S)
you could end up with a cooper plated container of iron sulphate.
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