Question

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Answer 1

Answer:

.

Explanation:

Answer 2

a)

difference:-

• The primary difference between the two is that Thermoset is a material that strengthens when heated, but cannot be remolded or heated after the initial forming, while thermoplastics can be reheated, remolded, and cooled as necessary without causing any chemical changes.

thermosetting plastic:-

• Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane and phenolic.

• Unlike thermoplastic pellets, the components of thermoset polymers are stored in liquid form, usually in large tanks or containers.

• Different thermosets provide different advantages when used as a production material.

thermoplastic:-

• Thermoplastics are defined as polymers that can be melted and recast almost indefinitely.

• They are molten when heated and harden upon cooling.

• When frozen, however, a thermoplastic becomes glass-like and subject to fracture.

b)

water reaction :-

• When a metal reacts with water, a metal hydroxide and hydrogen are formed. For example: Sodium reacts vigorously with water.

• Calcium reacts readily with water.Potassium is a soft, silver-white metal that reacts violently with water to form hydrogen and potassium hydroxide.

• The heat of this reaction ignites the hydrogen, producing a vigorous bluish-pink flame. Like sodium metal, potassium metal may explode in water.

• In general the reactions of metals with water produce hydrogen gas (H 2 ) and the hydroxides of the metals.

• Metals with moderate to low reactivity react very slowly with water.

• However, they react moderately with steam when heated and give hydrogen gas and metal oxides.

does not react :-

• Metals like aluminium, iron and zinc do not react either with cold or hot water.

• Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen.

• Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen. Metals such as lead, copper, silver and gold do not react with water at all.

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