Chemical Tests
Gbogbo ọrọ náà
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.
Ebumnobi
- 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
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
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.
- 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
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
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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