Chemical Tests
Bayani Gaba-gaba
When a chemist is handed an unknown substance, the first task is identification. Chemical tests provide a systematic toolkit for detecting specific gases, metal cations, and anions using simple bench reagents. Each test produces a characteristic observation, from a coloured flame to a precipitate, that narrows down what the substance contains.
In this lesson you will learn the standard tests for five common gases, the flame test colours for five metal ions, how to identify cations using sodium hydroxide solution, how to detect anions with acidified silver nitrate and barium chloride, and how to test for the presence and purity of water.
Manufura
- Describe tests for gases: hydrogen, oxygen, carbon dioxide, ammonia and chlorine
- Describe how to carry out a flame test
- Know the colours formed in flame tests for Li+, Na+, K+, Ca2+ and Cu2+
- Describe tests for cations using sodium hydroxide solution
- Describe tests for anions using acidified silver nitrate and acidified barium chloride solutions
- 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
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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.
- What colour flame does potassium produce in a flame test? A) Crimson B) Yellow C) Lilac D) Blue-green Answer: C
- Which gas relights a glowing splint? A) Hydrogen B) Carbon dioxide C) Chlorine D) Oxygen Answer: D
- A few drops of NaOH solution are added to a solution and a green precipitate forms. Which ion is present? A) Cu2+ B) Fe2+ C) Fe3+ D) Al3+ Answer: B
- Anhydrous copper(II) sulfate is white. What colour does it turn when water is added? A) Green B) Red C) Blue D) Yellow Answer: C
- To test for sulfate ions, you add dilute hydrochloric acid followed by: A) Silver nitrate solution B) Barium chloride solution C) Sodium hydroxide solution D) Limewater Answer: B
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