Group I Properties
Muhtasari
Drop a small piece of sodium into water and it fizzes, skates across the surface and may burst into flame. Potassium does the same, only more violently. These are the Group I alkali metals, a family so reactive that they must be stored under oil, and their behaviour changes in a clear, predictable way as you move down the group.
In this lesson you will learn the physical properties of lithium, sodium and potassium, the three trends you must know going down Group I, and the reasoning behind them. By the end you should be able to predict the properties of metals further down the group and justify your prediction.
Malengo
- [Core] Describe the Group I alkali metals, lithium, sodium and potassium, as relatively soft metals with general trends down the group, limited to: (a) decreasing melting point (b) increasing density (c) increasing reactivity with water
- [Supplement] Predict the properties of other elements in Group I, given information about the elements
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Group I Properties. 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 is a property of the Group I alkali metals? A. They are very hard B. They are relatively soft C. They are unreactive D. They are non-metals Answer: B
- Going down Group I, the melting point: A. Increases B. Decreases C. Stays the same D. First rises then falls Answer: B
- Going down Group I, the reactivity: A. Increases B. Decreases C. Stays the same D. Is zero Answer: A
- Going down Group I, the density: A. Increases B. Decreases C. Stays the same D. Becomes negative Answer: A
- Which alkali metal reacts most vigorously with water? A. Lithium B. Sodium C. Potassium D. They are all equal Answer: C
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Vitabu Vinavyopendekezwa
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Sehemu ya kitabu
Periodicity
Classify elements
"Chemistry: Periodicity" 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/18-1-periodicity. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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