Chemical Tests
Bayani Gaba-gaba
How do you prove that the gas bubbling out of a reaction is hydrogen and not carbon dioxide? How can you tell whether a white powder contains copper ions or iron ions? Chemical tests give you a definitive answer, and the Edexcel specification requires you to know a precise toolkit of tests for gases, cations and anions.
In this lesson you will learn how to identify five common gases, carry out flame tests for metal cations, detect specific ions using reagents, and confirm whether a liquid is pure water. These tests appear regularly on both papers.
Manufura
- describe tests for these gases: - hydrogen - oxygen - carbon dioxide - ammonia - chlorine.
- describe how to carry out a flame test
- know the colours formed in flame tests for these cations:
- 2.48 - Li+ is red - Na+ is yellow - K+ is lilac - Ca2+ is orange-red - Cu2+ is blue-green. describe tests for these cations: - NH4+ using sodium hydroxide solution and identifying the gas evolved - Cu2+, Fe2+ and Fe3+ using sodium hydroxide solution. describe tests for these anions: - Cl-, Br- and I- using acidified silver nitrate solution - SO42- using acidified barium chloride solution - CO32- using hydrochloric acid and identifying the gas evolved.
- describe a test for the presence of water using anhydrous copper(II) sulfate
- describe a physical test to show whether a sample of water is pure
Takardar Darasi
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Nazarin Darasi
Barka da kammala darasi akan Chemical Tests. 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.
- Which gas relights a glowing splint? A) Hydrogen B) Carbon dioxide C) Oxygen D) Ammonia Answer: C
- A flame test produces an orange-red colour. Which cation is present? A) Lithium B) Sodium C) Calcium D) Copper Answer: C
- Adding sodium hydroxide to a solution produces a green precipitate. The cation present is: A) Cu2+ B) Fe2+ C) Fe3+ D) Na+ Answer: B
- Anhydrous copper(II) sulfate is used to test for: A) Carbon dioxide B) Oxygen C) Water D) Chlorine Answer: C
- A white precipitate with acidified silver nitrate indicates the presence of: A) Bromide ions B) Iodide ions C) Sulfate ions D) Chloride ions Answer: D
Akwai a cikin manhajar Green Bridge
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
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
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Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Chemical Tests? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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