Chemical Tests
Akopọ
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.
Awọn Afojusun
- 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
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Oriire fun ipari ẹkọ lori Chemical Tests. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
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