Charlene Sci 7.1 Practical 7.1 Tests for Oxygen, Carbon Dioxide and Nitrogen PDF

® Practical 7. 1 \ Tests for oxygen, carbon dioxide and nitrogen Aim To find out tests for identifying oxygen, carbon dioxide and nitrogen _— Apparatus and materials per group wooden spli...

® Practical 7. 1 \ Tests for oxygen, carbon dioxide and nitrogen Aim To find out tests for identifying oxygen, carbon dioxide and nitrogen _— Apparatus and materials per group wooden splint 6 test tube rack 1 | test tube filled with oxygen 5 gas lighter 1 test tube filled with carbon dioxide 5 hydrogencarbonate indicator™ test tube filled with nitrogen 5 lime water™ (~) Wear safety spectacles! Part | Oxygen 1 Your teacher will give you five test tubes filled with oxygen (A to E). 2 Observe the gas in tube A. Record the colour of the gas in the table on p. 7. 3 Remove the stopper of tube A. Fan the gas towards your nose and smell it. Record the smell of the gas. Caution Do not breathe in the gas directly. Pe LY LILA E TAN ALT INTIS AN INIT ALLL SA thts. OT TT Ll Ll Ld aa LTR RY LE PP I PPP a 4 EEE 1g/R%| hydrogencarbonate indicator #ixE lime water RIRIK  4 Light a wooden splint with a gas lighter to get a burning splint”. Remove the stopper of tube B and put the burning splint into the tube immediately. put into burning splint the tube immediately ; ETI Record your observations. £3} Skill tips When we test for gases, we must act quickly to minimize the escape of gases. 5 Light another wooden splint. Blow the flame out to get a glowing splint. Remove the stopper of tube C and put the glowing splint into the tube immediately. burning splint alowing splint en into the tube immediately burning splint fF EAE glowing splint A #2 ER) AE S 6 Remove the stopper of tube D. Add 10 drops of hydrogencarbonate indicator to the tube and stopper the tube immediately. Shake the tube gently. Record your observations. 7 Remove the stopper of tube E. Add 10 drops of lime water to the tube and stopper the tube immediately. Shake the tube gently. Record your observations. Part Il Carbon dioxide Your teacher will give you five test tubes filled with carbon dioxide (F to J). Repeat the steps in Part I with carbon dioxide. Part lll Nitrogen Your teacher will give you five test tubes filled with nitrogen (K to O). Repeat the steps in Part I with nitrogen.  Colour of the gas (Step 2) colourless colourless colonrless Smell of the gas What happens to the burning splint (Step 4) What happens to the glowing splint (Step 5) What happens to the hydrogencarbonate fwrns From red Ts remains indicator (Step 6) What happens to the : : colourless) (Ts To remains a its Romgins colourless Torn ke lime water (Step 7) Discussion Based on the results, suggest a test (if any) for identifying each of the gases below. 2 Oiygen of ovygen 1s present. ( ony S Jind b Nt ne the r.SSere 0) Burning spl? burns mere brphdh, # oxygen is present b Carbon dioxide Hydrogen carbonate dicafor fwrns from red 4 sella IE cunkon resent Lime wate Turns from colourless 1, Ie ctrdon Mogh”1s present. ¢ Nitrogen | Tlere iS no Simple Tes Tor hit