Chlorine is one of the elements in Group 17 of the Periodic Table. Describe the colours of the Group 17 elements, chlorine to iodine, at room temperature. ....................................................................................................................................... . ................................................................................................................................. (ii) Describe the relative reactivity of the elements chlorine to iodine as oxidising agents. ................................................................................................................................. (iii) State what is observed when chlorine reacts with hydrogen. ................................................................................................................................. . (iv) Explain why the thermal stability of the hydrogen halides decreases down the group. ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_23 Year：2024 Question No：2(a)

Answer:

11.1.1 describe the colours and the trend in volatility of chlorine, bromine and iodine

11.1.2 describe and explain the trend in the bond strength of the halogen molecules

11.1.3 interpret the volatility of the elements in terms of instantaneous dipole–induced dipole forces

11.2.1 describe the relative reactivity of the elements as oxidising agents

11.2.2 describe the reactions of the elements with hydrogen and explain their relative reactivity in these reactions

11.2.3 describe the relative thermal stabilities of the hydrogen halides and explain these in terms of bond strengths