Chemical Tests
Gbogbo ọrọ náà
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.
Ebumnobi
- 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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Akwụkwọ Ọmụmụ
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Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Chemical Tests. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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
Rue ajuju ndi a n'ime ngwa ahu
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Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Chemical Tests? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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