Group 7 (halogens) - Chlorine, Bromine And Iodine
Muhtasari
Open a bottle of bleach and the sharp smell reaching your nose is chlorine, one of the halogens. These five reactive non-metals sit in Group 7 of the periodic table, and despite ranging from a pale yellow gas to a dark solid, they form a tight chemical family with predictable patterns.
In this lesson you will compare the physical properties and colours of chlorine, bromine and iodine, investigate displacement reactions that prove their reactivity order, and explain why reactivity decreases down the group using electronic configurations.
Malengo
- 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
- explain the trend in reactivity in Group 7 in terms of electronic configurations
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Group 7 (halogens) - Chlorine, Bromine And Iodine. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Which halogen is a liquid at room temperature? A) Fluorine B) Chlorine C) Bromine D) Iodine Answer: C
- What happens when bromine water is added to potassium chloride solution? A) The solution turns brown B) The solution turns orange C) Chlorine gas is released D) No reaction occurs Answer: D
- The reactivity of the halogens decreases down the group because: A) The atoms get smaller B) The outer shell is further from the nucleus, making it harder to gain an electron C) They lose electrons more easily D) They have fewer protons Answer: B
- Which of the following correctly describes the trend in boiling point down Group 7? A) Decreases B) Stays the same C) Increases D) Increases then decreases Answer: C
- Chlorine can displace bromine from potassium bromide solution because: A) Chlorine is less reactive than bromine B) Chlorine is more reactive than bromine C) Bromine is a gas D) Potassium is more reactive than chlorine Answer: B
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
Occurrence, Preparation, and Properties of Halogens
Describe the preparation, properties, and uses of halogens
"Chemistry: Occurrence, Preparation, and Properties of Halogens" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/18-11-occurrence-preparation-and-properties-of-halogens. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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