Group VII Properties
Bayani Gaba-gaba
The Group VII halogens are a striking family of coloured, reactive non-metals: a pale yellow-green gas, a red-brown liquid and a grey-black solid, all sitting in the same column of the periodic table. They are the mirror image of the Group I metals, with a reactivity that falls, rather than rises, as you go down the group.
In this lesson you will learn the appearance of chlorine, bromine and iodine at room temperature, the trends in density and reactivity, and the displacement reactions that prove the order of reactivity. More than that, you will understand why the trend runs the way it does, so you can predict how an unfamiliar halogen will behave and justify it like an examiner.
Manufura
- Describe the Group VII halogens, chlorine, bromine and iodine, as diatomic non-metals with general trends down the group, limited to: (a) increasing density (b) decreasing reactivity.
- State the appearance of the halogens at r.t.p. as: (a) chlorine, a pale yellow-green gas (b) bromine, a red-brown liquid (c) iodine, a grey-black solid.
- Describe and explain the displacement reactions of halogens with other halide ions.
- Predict the properties of other elements in Group VII, given information about the elements.
Takardar Darasi
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Nazarin Darasi
Barka da kammala darasi akan Group VII Properties. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- What is the appearance of bromine at room temperature and pressure? A. Pale yellow-green gas B. Red-brown liquid C. Grey-black solid D. Colourless gas Answer: B
- Going down Group VII, the reactivity: A. Increases B. Decreases C. Stays the same D. Becomes zero Answer: B
- Which halogen will displace iodine from potassium iodide solution? A. Iodine itself B. Astatine C. Chlorine D. None of them Answer: C
- Why does iodine not displace chlorine from sodium chloride solution? A. Iodine is a solid B. Iodine is less reactive than chlorine C. Chlorine is a gas D. They do not dissolve Answer: B
- Going down Group VII, the density: A. Increases B. Decreases C. Stays the same D. Becomes negative Answer: A
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