Group 7 (halogens)
Bayani Gaba-gaba
The halogens sit in Group 7 of the periodic table and include some of the most recognisable non-metals in chemistry. Chlorine disinfects swimming pools, bromine is one of only two elements that are liquid at room temperature, and iodine is the dark solid used to test for starch. Despite looking very different, all halogens share a pattern of chemical behaviour because they each have seven electrons in their outer shell.
In this lesson you will learn the physical properties and trends across Group 7, explore how displacement reactions reveal the reactivity trend, and practise predicting the properties of halogens you may not have met.
Manufura
- Know the colours, physical states (at room temperature) and trends in physical properties of these elements
- Use knowledge of trends in Group 7 to predict the properties of other halogens
- Understand how displacement reactions involving halogens and halides provide evidence for the trend in reactivity in Group 7
Takardar Darasi
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Nazarin Darasi
Barka da kammala darasi akan Group 7 (halogens). 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 physical state of bromine at room temperature? A) Solid B) Liquid C) Gas D) Plasma Answer: B
- Which halogen is the most reactive? A) Iodine B) Bromine C) Chlorine D) Fluorine Answer: D
- What colour change is seen when chlorine water is added to potassium bromide solution? A) Colourless to brown B) Colourless to orange C) Orange to colourless D) Brown to colourless Answer: B
- Why does reactivity decrease down Group 7? A) The atoms lose electrons more easily B) The atoms have fewer electrons in their outer shell C) The outer shell is further from the nucleus, weakening the attraction for incoming electrons D) The atoms become smaller Answer: C
- Which of the following displacement reactions would NOT occur? A) Chlorine added to potassium iodide B) Bromine added to potassium iodide C) Iodine added to potassium bromide D) Chlorine added to potassium bromide Answer: C
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Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Akwai a cikin manhajar Green Bridge
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Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Group 7 (halogens)? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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