Identification Of Common Gases
Muhtasari
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.
Malengo
- 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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Hongera kwa kukamilisha somo la Identification Of Common Gases. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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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