Question

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Answer 1

Answer:

1.Acetophenone

The compound that is used in pistachio flavor in ice cream is Acetophenone. It is an organic compound and the simplest aromatic ketone.

2.The following chart describes the most common oxidation states of the period 3 elements. Scandium is one of the two elements in the first transition metal period which has only one oxidation state (zinc is the other, with an oxidation state of +2). All the other elements have at least two different oxidation states.

3.Van-Arkel method :

Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form a volatile compound. TTiI 4

leaving behind the impurities .TTil 4

is further heated to 1700K when it decomposes to give pure titanium.

van-Arkel method involes use of II2

to form volatile iodide of metals which on decomposition gives pure metals.

4.ΔU= change in internal energy

W=−300J(System)

ΔU= q+W

ΔU=600J−300J=300J

Thus, the change in internal energy is 300J

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