Identification Of Common Gases
Gbogbo ọrọ náà
Four stoppered test tubes sit on the bench and not one of them carries a label. Three hold gases you cannot see at all; the fourth has a faint green tint if you catch it against white paper. There is no instrument in the room that will read them out for you. What you do have is a wooden splint, a strip of coloured paper, a bottle of cloudy-looking water and your own sense of smell used very carefully. Within about three minutes, every tube can be named.
That is the quiet promise of qualitative analysis: a handful of cheap, repeatable observations, each one designed so that a single gas gives a result nothing else gives. This lesson works through the four gases OxfordAQA expects you to identify, shows the reaction behind each observation rather than asking you to memorise a list, and deals with the two details that quietly cost marks every year: why the paper has to be damp, and why a limewater test left running too long can tell you the opposite of the truth.
Ebumnobi
- A pop is heard when a lighted splint is placed near hydrogen gas.
- A glowing splint relights in a test tube of oxygen gas.
- Carbon dioxide turns limewater (calcium hydroxide solution) cloudy white.
- Chlorine has a characteristic sharp, choking smell. It also makes damp blue litmus paper turn red, and then bleaches it white.
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Ekele diri gi maka imecha ihe karịrị na Identification Of Common Gases. 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. oxygen C. carbon dioxide D. chlorine Answer: B
- A colourless gas is bubbled through limewater and the limewater turns cloudy white. The gas is: A. chlorine B. hydrogen C. carbon dioxide D. oxygen Answer: C
- Damp blue litmus paper is held in a tube of gas. The paper turns red and is then bleached white. Which gas is in the tube? A. oxygen B. chlorine C. hydrogen D. carbon dioxide Answer: B
- Why must the litmus paper be damp when testing for chlorine? A. Damp paper is easier to hold in the tube. B. The water cools the gas so that it reacts more slowly. C. The chlorine must dissolve in the water and react with it to form acids. D. The water reacts with the chlorine to produce calcium carbonate. Answer: C
- A lighted splint is held at the mouth of a tube of gas and a squeaky pop is heard. Which gas is in the tube, and what is the product of the reaction? A. oxygen, and the product is carbon dioxide B. hydrogen, and the product is water C. hydrogen, and the product is hydrogen chloride D. chlorine, and the product is water Answer: B
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