Although copper is a relatively unreactive element, when it is heated to a high
ID: 979586 • Letter: A
Question
Although copper is a relatively unreactive element, when it is heated to a high temperature in an excess of chlorine. copper(II) chloride is formed. When a mixture of argon and chlorine is heated to a high temperature, no reaction occurs. How does chlorine behave in its reaction with copper? Suggest a reason for the lack of a reaction between argon and chlorine. The melting points of the noble gases neon to xenon are given below. Explain why there is an increase in melting point from neon to xenon.Explanation / Answer
) Cu + Cl2 + CuCl2
Chlorine is a halogen in group 17 and period 3, it is highly reactive halogen. Chlorine get easily reduce and behaves as good oxidizing agent. In case of above mentioned reaction chlorine does not react easily with copper at room temperature but when copper is heated chlorine gas reacts vigorously with it forming bluish green colour copper (II) chloride.
Cupper fillings get oxidized and chlorine gas get reduced to form stable CuCl2 compound.
Answer 2) Cl + Ar No reaction (at high temperature)
Argon is a Nobel gas (non-reactive). Argon has completely satisfied valance orbitals with 3S2 3P6 configuration. Chlorine is a highly electro negative non-metal element in periodic table with 3s2 3p5 configuration. Hence even at high temperatures both of them doesn’t react.
Answer 3)
The melting and boiling points of noble gases are very low in comparison to those of other substances of comparable atomic and molecular masses. Generally boiling point of the element is depending upon the molecular weight and size of the atom and Van der Waals force of attraction between them. In case of nobel gases these Van der Waals force or London dispersion forces are very weak hence the boiling point of all the nobel gases are very low.
Also these forces between the atoms of the element increase with size of the atom.
From Ne to Xe size of the atom increases hence van der waals force increases between them so intern boiling and melting points also increase from Ne to Xe.
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